/* ==========================================================================
   CSS Variables - Modify these to change the entire design
   ========================================================================== */

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-background-dark: #111827;
    --color-border: #e5e7eb;
    --color-accent: #10b981;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Layout */
    --container-max-width: 1200px;
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

/* ==========================================================================
   Self-hosted Fonts (SIL Open Font License)
   ========================================================================== */

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('assets/fonts/JetBrainsMono-Regular.woff2') format('woff2');
}

@font-face {
    font-family: 'Lexend';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url('assets/fonts/Lexend-latin.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
    font-family: 'Lexend';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url('assets/fonts/Lexend-latin-ext.woff2') format('woff2');
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: var(--line-height-normal);
    text-wrap: pretty;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Layout Components
   ========================================================================== */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
    background-color: transparent;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transition: all var(--transition-base);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-bottom: 1px solid transparent;
}

.header.scrolled::before {
    opacity: 1;
    border-bottom-color: var(--color-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 1;
}

.logo {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, var(--color-primary), #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 52px;
    height: 52px;
    margin: -12px -8px -12px -12px;
    border-radius: 6px;
    object-fit: contain;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links {
    display: flex;
    gap: var(--spacing-2xl);
}

/* Hamburger menu toggle (hidden on desktop) */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    padding: 0;
    transition: all var(--transition-fast);
}

.nav-toggle:hover {
    background: var(--color-background-alt);
    border-color: var(--color-primary);
}

.nav-toggle span {
    display: block;
    width: 16px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: all var(--transition-base);
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), #7c3aed);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: calc(var(--spacing-4xl) + 80px) 0 var(--spacing-4xl);
    background:
        radial-gradient(circle at 20% 50%, rgba(16, 185, 129, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(124, 58, 237, 0.05) 0%, transparent 50%),
        var(--color-background);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-50px, -50px) rotate(180deg); }
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text) 50%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-2xl);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    text-wrap: balance;
}

.highlight-accent {
    color: var(--color-accent);
    background: none;
    -webkit-text-fill-color: var(--color-accent);
}

.hero-highlights {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
}

.highlight {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 100px;
    border: 1px solid rgba(37, 99, 235, 0.1);
    transition: all var(--transition-base);
}

.highlight:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.3);
}

.highlight-icon {
    font-size: var(--font-size-lg);
}

.highlight-text {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-3xl);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    border-radius: 100px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-sans);
    text-decoration: none;
}

.cta-primary {
    background: linear-gradient(135deg, var(--color-accent), #059669);
    color: white;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(16, 185, 129, 0.4);
}

.cta-secondary {
    background: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.cta-secondary:hover {
    background: var(--color-background-alt);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.hero-note {
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    text-align: center;
}

.hero-sub-tagline {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-align: center;
    opacity: 0.7;
}

.coming-soon {
    display: inline-block;
    text-align: center;
}

.coming-soon-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), #7c3aed);
    color: white;
    border-radius: 100px;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
    transition: all var(--transition-base);
}

.coming-soon-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.4);
}

.coming-soon-text {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

/* ==========================================================================
   Stats Section
   ========================================================================== */

.stats {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(to bottom, var(--color-background), var(--color-background-alt));
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-3xl);
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.stat-value {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    line-height: 1;
    white-space: nowrap;
}

.stat-label {
    font-size: var(--font-size-base);
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

.stat-value-text {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

/* ==========================================================================
   Features Section
   ========================================================================== */

.features {
    padding: var(--spacing-4xl) 0;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    letter-spacing: -0.02em;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    text-align: center;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
    line-height: var(--line-height-relaxed);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), #7c3aed);
    border-radius: 2px;
}

.feature-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4xl);
}

.feature-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease-out forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }

.feature-hero {
    position: relative;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(5, 150, 105, 0.05));
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--color-accent);
}

.feature-badge {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-accent), #059669);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 100px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.screenshot-placeholder {
    background: linear-gradient(135deg, rgba(243, 244, 246, 0.3), rgba(229, 231, 235, 0.3));
    border: 1px dashed rgba(229, 231, 235, 0.6);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 250px;
    text-align: center;
    gap: var(--spacing-sm);
}

.placeholder-icon {
    font-size: 2rem;
    opacity: 0.15;
}

.placeholder-icon-large {
    font-size: 3rem;
    opacity: 0.15;
}

.placeholder-label {
    font-size: 0.625rem;
    font-weight: var(--font-weight-bold);
    color: rgba(16, 185, 129, 0.4);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: rgba(255, 255, 255, 0.5);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
}

.placeholder-description {
    font-size: 0.75rem;
    color: rgba(107, 114, 128, 0.5);
    max-width: 300px;
    line-height: var(--line-height-relaxed);
}

.placeholder-description strong {
    color: rgba(31, 41, 55, 0.6);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.placeholder-icon-only {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(5, 150, 105, 0.05));
    border-style: solid;
    border-color: rgba(16, 185, 129, 0.2);
}

.privacy-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.privacy-item-wide {
    grid-column: 1 / -1;
    max-width: 280px;
    width: 100%;
    justify-self: center;
}

.privacy-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.privacy-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.05);
    border-color: var(--color-accent);
}

.privacy-icon {
    font-size: 2rem;
}

.privacy-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }
.feature-card:nth-child(7) { animation-delay: 0.7s; }
.feature-card:nth-child(8) { animation-delay: 0.8s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card-reverse {
    direction: rtl;
}

.feature-card-reverse > * {
    direction: ltr;
}

.feature-content {
    padding: var(--spacing-xl);
}

.feature-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    letter-spacing: -0.01em;
    position: relative;
    display: inline-block;
}

.feature-title::before {
    content: '';
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    background: linear-gradient(180deg, var(--color-primary), #7c3aed);
    border-radius: 2px;
}

.feature-description {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.feature-list {
    list-style: none;
    padding-left: 0;
}

.feature-list li {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    padding: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-lg);
    position: relative;
    line-height: var(--line-height-relaxed);
}

.feature-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

.feature-image {
    display: flex;
    align-items: center;
    justify-content: center;
    /* No background/border - the phone frame handles it */
    background: none;
    border: none;
    box-shadow: none;
    overflow: visible;
    padding: var(--spacing-xl);
}

/* Phone device frame */
.feature-hero .feature-title::before {
    display: none;
}

.feature-image .phone-frame {
    position: relative;
    display: inline-block;
    padding: 8px;
    background: #1a1a2e;
    border-radius: 36px;
    box-shadow:
        0 0 0 2px #2a2a3e,
        0 20px 50px rgba(0, 0, 0, 0.35),
        0 8px 20px rgba(0, 0, 0, 0.2),
        inset 0 0 0 1px rgba(255, 255, 255, 0.05);
    max-width: 280px;
}

/* Dynamic Island notch */
.feature-image .phone-frame::before {
    content: '';
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 22px;
    background: #0a0a14;
    border-radius: 20px;
    z-index: 2;
}

/* Screen container */
.feature-image .phone-frame .phone-screen {
    border-radius: 26px;
    overflow: hidden;
    position: relative;
    background: #000;
}

.feature-image .phone-frame .phone-screen img {
    width: 100%;
    height: auto;
    display: block;
}

/* Fallback for images without phone-frame wrapper */
.feature-image > img {
    max-width: 80%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.feature-image-icon {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(5, 150, 105, 0.05));
    border-color: rgba(16, 185, 129, 0.2);
    min-height: 250px;
}

.privacy-icon-display {
    font-size: 5rem;
    opacity: 0.6;
}

/* ==========================================================================
   Themes Showcase Section
   ========================================================================== */

.themes {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(to bottom, var(--color-background), var(--color-background-alt));
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.theme-showcase {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.theme-word-display {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-3xl) var(--spacing-xl);
    min-height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    position: relative;
}

.theme-word {
    font-size: clamp(2rem, 6vw, 3.5rem);
    color: rgba(255, 255, 255, 0.9);
    font-weight: var(--font-weight-normal);
    font-family: var(--font-sans);
    transition: all var(--transition-slow);
    line-height: 1.3;
    display: inline-block;
    position: relative;
}

/* Standard theme: ORP letter highlighted in red */
.theme-word .orp-letter {
    color: #ef4444;
    font-weight: var(--font-weight-bold);
}

/* ORP Reticle theme: ORP letter with crosshair lines */
.theme-word .orp-reticle-letter {
    color: #ef4444;
    font-weight: var(--font-weight-bold);
    position: relative;
    display: inline-block;
}

.theme-word .orp-reticle-letter::before,
.theme-word .orp-reticle-letter::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: #ef4444;
}

.theme-word .orp-reticle-letter::before {
    bottom: 100%;
    height: 32px;
    margin-bottom: 4px;
}

.theme-word .orp-reticle-letter::after {
    top: 100%;
    height: 32px;
    margin-top: 4px;
}

/* Focus Bold theme: first ~40% of letters are bold */
.theme-word .focus-bold-strong {
    font-weight: var(--font-weight-bold);
    color: white;
}

.theme-word .focus-bold-light {
    font-weight: 300;
    color: rgba(255, 255, 255, 0.55);
}

/* Monospace theme */
.theme-word.theme-monospace {
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.05em;
}

/* Dyslexia theme */
.theme-word.theme-dyslexia {
    font-family: 'Lexend', sans-serif;
    letter-spacing: 0.12em;
    font-weight: var(--font-weight-medium);
    word-spacing: 0.2em;
}

/* Theme tabs */
.theme-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.theme-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 100px;
    border: 1px solid var(--color-border);
    background: var(--color-background);
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.theme-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.theme-tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* Theme description */
.theme-description {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    max-width: 450px;
    margin: 0 auto;
    min-height: 3em;
}

/* Responsive */
@media (max-width: 768px) {
    .theme-word-display {
        padding: var(--spacing-2xl) var(--spacing-lg);
        min-height: 130px;
    }

    .theme-tabs {
        gap: var(--spacing-xs);
    }

    .theme-tab {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .themes {
        padding: var(--spacing-3xl) 0;
    }

    .theme-word-display {
        min-height: 110px;
        padding: var(--spacing-xl) var(--spacing-md);
    }
}

/* ==========================================================================
   Gradient Reading Section
   ========================================================================== */

.gradient-section {
    padding: var(--spacing-4xl) 0;
}

.gradient-showcase {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.gradient-text-display {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    text-align: left;
}

.gradient-text-display p {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
}

.gradient-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.gradient-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 100px;
    border: 1px solid var(--color-border);
    background: var(--color-background);
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.gradient-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.gradient-tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.gradient-tab-swatch {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    flex-shrink: 0;
}

.gradient-tab.active .gradient-tab-swatch {
    border-color: rgba(255, 255, 255, 0.6);
}

.gradient-description {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    max-width: 500px;
    margin: 0 auto;
    min-height: 3em;
}

/* Responsive */
@media (max-width: 768px) {
    .gradient-text-display {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .gradient-tabs {
        gap: var(--spacing-xs);
    }

    .gradient-tab {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.8rem;
    }
}

/* ==========================================================================
   Research Section
   ========================================================================== */

.research {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-background-alt);
    border-top: 1px solid var(--color-border);
}

.research-summary {
    max-width: 750px;
    margin: var(--spacing-2xl) auto 0;
    text-align: center;
}

.research-summary p {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.research-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-decoration: none;
    transition: all var(--transition-base);
}

.research-link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Research Page */
.header-static {
    position: relative;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
}

.header-static .logo {
    text-decoration: none;
}

.research-hero {
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    text-align: center;
    background:
        radial-gradient(circle at 30% 50%, rgba(37, 99, 235, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(124, 58, 237, 0.05) 0%, transparent 50%),
        var(--color-background);
}

.research-page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.research-page-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
    max-width: 650px;
    margin: 0 auto;
}

.studies {
    padding: var(--spacing-3xl) 0 var(--spacing-4xl);
}

.studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1100px;
    margin: 0 auto;
}

.study-card {
    background: var(--color-background);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.study-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.study-positive {
    border-left: 4px solid var(--color-accent);
}

.study-critical {
    border-left: 4px solid #f59e0b;
}

.study-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 100px;
    width: fit-content;
}

.study-tag-positive {
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
}

.study-tag-critical {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

.study-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: var(--line-height-tight);
}

.study-authors {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    font-style: italic;
}

.study-finding {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
    flex-grow: 1;
}

.study-doi {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    text-decoration: none;
    word-break: break-all;
    margin-top: var(--spacing-sm);
}

.study-doi:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Legal Pages (Datenschutz, Impressum)
   ========================================================================== */

.legal-page {
    padding: var(--spacing-4xl) 0 var(--spacing-3xl);
}

.legal-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.legal-updated {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-3xl);
}

.legal-content {
    max-width: 780px;
    line-height: var(--line-height-relaxed);
    color: var(--color-text);
}

.legal-content h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-top: var(--spacing-3xl);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
}

.legal-content h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.legal-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
}

.legal-content ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.legal-content li {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.legal-content a {
    color: var(--color-primary);
    text-decoration: none;
}

.legal-content a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Roadmap Section
   ========================================================================== */

.roadmap {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-background-alt);
}

.roadmap-intro {
    text-align: center;
    font-size: var(--font-size-xl);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-3xl);
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.roadmap-item {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    border: 1px solid rgba(37, 99, 235, 0.1);
    text-align: center;
    transition: all var(--transition-base);
}

.roadmap-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.2);
}

.roadmap-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
    display: inline-block;
}

.roadmap-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.roadmap-description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: linear-gradient(135deg, var(--color-background-dark) 0%, #0f172a 100%);
    color: white;
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    margin-top: var(--spacing-4xl);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-main {
    text-align: left;
}

.footer-brand {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, white, rgba(255, 255, 255, 0.8));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.footer-tagline {
    font-size: var(--font-size-base);
    opacity: 0.7;
    margin-bottom: var(--spacing-md);
}

.footer-text {
    font-size: var(--font-size-base);
    opacity: 0.8;
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.footer-socials {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transition: background var(--transition-base);
}

.footer-social:hover {
    background: rgba(255, 255, 255, 0.2);
}

.google-play-badge {
    display: inline-block;
    transition: opacity var(--transition-base);
}

.google-play-badge:hover {
    opacity: 0.85;
}

.hero-play-badge img {
    transition: all var(--transition-base);
}

.hero-play-badge:hover img {
    transform: translateY(-2px);
}

.google-play-badge img {
    display: block;
}

.footer-play-badge {
    margin-top: var(--spacing-xs);
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.6;
    margin-bottom: var(--spacing-xs);
}

.footer-link {
    color: white;
    text-decoration: none;
    font-size: var(--font-size-base);
    opacity: 0.8;
    transition: opacity var(--transition-base);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    text-align: left;
    font-family: var(--font-sans);
}

.footer-link:hover {
    opacity: 1;
}

.footer-link-button {
    width: fit-content;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
    font-size: var(--font-size-sm);
    opacity: 0.6;
    margin-top: var(--spacing-xl);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: calc(var(--spacing-3xl) + 80px) 0 var(--spacing-3xl);
    }

    .hero::before {
        width: 400px;
        height: 400px;
    }

    .hero-highlights {
        flex-direction: column;
        align-items: stretch;
    }

    .highlight {
        justify-content: center;
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .cta-button {
        width: auto;
        justify-content: center;
        padding: var(--spacing-md) var(--spacing-2xl);
    }

    .stats {
        padding: var(--spacing-2xl) 0;
    }

    .stats-grid {
        grid-template-columns: auto auto auto auto;
        justify-content: center;
        gap: var(--spacing-xl);
    }

    .stat-value {
        font-size: clamp(1.5rem, 6vw, 2.5rem);
        white-space: nowrap;
    }

    .stat-label {
        white-space: nowrap;
    }

    .feature-grid {
        gap: var(--spacing-2xl);
    }

    .feature-card,
    .feature-card-reverse {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        direction: ltr;
        margin-bottom: 0;
    }

    .feature-card-reverse > * {
        direction: ltr;
    }

    .feature-content {
        padding: 0;
    }

    .feature-title::before {
        left: 0;
        top: -10px;
        width: 40px;
        height: 3px;
        transform: none;
    }

    .feature-hero {
        padding: var(--spacing-lg);
    }

    .feature-hero .feature-title {
        margin-top: var(--spacing-xl);
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: calc(100% + var(--spacing-xs));
        right: 0;
        width: 200px;
        flex-direction: column;
        background: var(--color-background);
        padding: var(--spacing-xs);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius-lg);
        box-shadow: var(--shadow-lg);
        gap: 0;
        z-index: 99;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links .nav-link {
        font-size: var(--font-size-sm);
        letter-spacing: 0.05em;
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--border-radius-sm);
        display: block;
    }

    .nav-links .nav-link:hover {
        background: var(--color-background-alt);
    }

    .roadmap-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .roadmap-item {
        padding: var(--spacing-lg);
    }

    .roadmap-icon {
        margin-bottom: var(--spacing-sm);
    }

    .roadmap-title {
        font-size: var(--font-size-base);
    }

    .roadmap-description {
        font-size: var(--font-size-sm);
    }

    .header-content {
        padding: var(--spacing-md) 0;
    }

    .logo {
        font-size: var(--font-size-xl);
    }

    .logo-icon {
        width: 48px;
        height: 48px;
        margin: -10px -6px -10px -10px;
    }

    .feature-image {
        padding: var(--spacing-sm);
    }

    .feature-image .phone-frame {
        max-width: 240px;
    }

    .stat-value-text {
        font-size: clamp(1.1rem, 4vw, 1.5rem);
    }

    .research-summary {
        text-align: left;
    }

    .research-summary p {
        font-size: var(--font-size-base);
    }

    .studies-grid {
        grid-template-columns: 1fr;
    }

    .footer {
        margin-top: var(--spacing-2xl);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: calc(var(--spacing-3xl) + 60px) 0 var(--spacing-3xl);
    }

    .features,
    .roadmap,
    .research {
        padding: var(--spacing-3xl) 0;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .feature-image .phone-frame {
        max-width: 200px;
    }

    .stats-grid {
        grid-template-columns: auto auto;
    }

    .roadmap-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Floating Demo Button
   ========================================================================== */

.demo-fab {
    position: fixed;
    bottom: var(--spacing-2xl);
    right: var(--spacing-2xl);
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
    transition: all var(--transition-base);
    font-family: var(--font-sans);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    animation: fabPulse 2s ease-in-out infinite;
}

@keyframes fabPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 12px 32px rgba(16, 185, 129, 0.6);
    }
}

.demo-fab:hover {
    transform: scale(1.1);
    box-shadow: 0 12px 32px rgba(16, 185, 129, 0.5);
}

.demo-fab:active {
    transform: scale(0.95);
}

.demo-fab svg {
    width: 20px;
    height: 20px;
}

.demo-fab-text {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   Speed Reading Demo Overlay
   ========================================================================== */

.demo-overlay {
    position: fixed;
    bottom: 120px;
    right: var(--spacing-2xl);
    z-index: 999;
    display: none;
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    transition: all var(--transition-slow);
}

.demo-overlay.active {
    display: block;
    opacity: 1;
    transform: translateY(0) scale(1);
}

.demo-reader {
    position: relative;
    width: 550px;
    max-width: calc(100vw - var(--spacing-4xl));
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.1);
    overflow: hidden;
    cursor: move;
    user-select: none;
}

.demo-reader-content {
    padding: var(--spacing-3xl) var(--spacing-xl);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.demo-word-display {
    margin-bottom: var(--spacing-2xl);
    position: relative;
    width: 100%;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-word {
    font-size: clamp(1.25rem, 4vw, 2rem);
    font-weight: var(--font-weight-medium);
    color: white;
    line-height: 1.2;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    position: relative;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    white-space: nowrap;
    width: 100%;
    max-width: 100%;
}

.word-before {
    color: rgba(255, 255, 255, 0.9);
    text-align: right;
    padding-right: 0;
}

.word-orp {
    color: #ef4444;
    font-weight: var(--font-weight-bold);
    position: relative;
    text-align: center;
}

/* Crosshair lines above and below ORP character */
.word-orp::before,
.word-orp::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: #ef4444;
    z-index: 10;
}

.word-orp::before {
    bottom: 100%;
    height: 40px;
    margin-bottom: 4px;
}

.word-orp::after {
    top: 100%;
    height: 40px;
    margin-top: 4px;
}

.word-after {
    color: rgba(255, 255, 255, 0.9);
    text-align: left;
    padding-left: 0;
}

.demo-progress-info {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

.demo-controls {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.demo-progress-bar {
    margin-bottom: var(--spacing-xl);
    position: relative;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
}

.demo-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, #ef4444, #dc2626);
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
}

.demo-progress-slider {
    position: absolute;
    top: -6px;
    left: 0;
    width: 100%;
    height: 16px;
    opacity: 0;
    cursor: pointer;
}

.demo-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.demo-control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.demo-control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

.demo-play-btn {
    width: 72px;
    height: 72px;
    background: rgba(255, 255, 255, 0.15);
}

.demo-speed-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.demo-speed-label {
    color: white;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.demo-speed-slider {
    width: 100%;
    max-width: 400px;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    -webkit-appearance: none;
}

.demo-speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.4);
}

.demo-speed-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.4);
}

.demo-close-btn,
.demo-settings-btn {
    position: absolute;
    top: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.demo-close-btn {
    right: var(--spacing-lg);
}

.demo-settings-btn {
    right: calc(var(--spacing-lg) + 60px);
}

.demo-close-btn:hover,
.demo-settings-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .demo-fab {
        width: 48px;
        height: 48px;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }

    .demo-fab svg {
        width: 16px;
        height: 16px;
    }

    .demo-fab-text {
        font-size: 0.55rem;
    }

    .demo-overlay {
        bottom: 90px;
        right: var(--spacing-lg);
        left: var(--spacing-lg);
    }

    .demo-reader {
        width: 100%;
        max-width: 100%;
        border-radius: var(--border-radius-lg);
    }

    .demo-reader-content {
        padding: var(--spacing-2xl) var(--spacing-lg);
        min-height: 200px;
    }

    .demo-word-display {
        min-height: 80px;
    }

    .demo-word {
        font-size: clamp(1rem, 5vw, 1.75rem);
    }

    .word-orp::before,
    .word-orp::after {
        height: 30px;
    }

    .word-orp::before {
        margin-bottom: 3px;
    }

    .word-orp::after {
        margin-top: 3px;
    }

    .demo-controls {
        padding: var(--spacing-md);
    }

    .demo-buttons {
        gap: var(--spacing-sm);
    }

    .demo-control-btn {
        width: 44px;
        height: 44px;
    }

    .demo-play-btn {
        width: 56px;
        height: 56px;
    }
}

/* ==========================================================================
   Dark Mode
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    :root:not(.light) {
        --color-text: #f1f5f9;
        --color-text-light: #94a3b8;
        --color-background: #0f172a;
        --color-background-alt: #1e293b;
        --color-background-dark: #020617;
        --color-border: #334155;
    }
}

html.dark {
    --color-text: #f1f5f9;
    --color-text-light: #94a3b8;
    --color-background: #0f172a;
    --color-background-alt: #1e293b;
    --color-background-dark: #020617;
    --color-border: #334155;
}

/* Header backdrop in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .header::before {
        background-color: rgba(15, 23, 42, 0.8);
    }
}

html.dark .header::before {
    background-color: rgba(15, 23, 42, 0.8);
}

/* Hero gradient in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .hero {
        background:
            radial-gradient(circle at 20% 50%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
            radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
            radial-gradient(circle at 50% 20%, rgba(124, 58, 237, 0.07) 0%, transparent 50%),
            var(--color-background);
    }

    :root:not(.light) .hero-title {
        background: linear-gradient(135deg, #f1f5f9 0%, #f1f5f9 50%, #60a5fa 100%);
        -webkit-background-clip: text;
        background-clip: text;
    }
}

html.dark .hero {
    background:
        radial-gradient(circle at 20% 50%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(124, 58, 237, 0.07) 0%, transparent 50%),
        var(--color-background);
}

html.dark .hero-title {
    background: linear-gradient(135deg, #f1f5f9 0%, #f1f5f9 50%, #60a5fa 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

/* Stats gradient in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .stats {
        background: linear-gradient(to bottom, var(--color-background), var(--color-background-alt));
    }
}

html.dark .stats {
    background: linear-gradient(to bottom, var(--color-background), var(--color-background-alt));
}

/* CTA secondary button in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .cta-secondary {
        color: #f1f5f9;
        border-color: var(--color-border);
    }

    :root:not(.light) .cta-secondary:hover {
        background: var(--color-background-alt);
        border-color: var(--color-primary);
    }
}

html.dark .cta-secondary {
    color: #f1f5f9;
    border-color: var(--color-border);
}

html.dark .cta-secondary:hover {
    background: var(--color-background-alt);
    border-color: var(--color-primary);
}

/* Feature cards in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .feature-hero {
        background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
    }

    :root:not(.light) .feature-image-icon {
        background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
        border-color: rgba(16, 185, 129, 0.3);
    }
}

html.dark .feature-hero {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
}

html.dark .feature-image-icon {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
    border-color: rgba(16, 185, 129, 0.3);
}

/* Privacy items in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .privacy-item {
        background: rgba(30, 41, 59, 0.6);
        border-color: var(--color-border);
    }
}

html.dark .privacy-item {
    background: rgba(30, 41, 59, 0.6);
    border-color: var(--color-border);
}

/* Highlights in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .highlight {
        background: rgba(30, 41, 59, 0.6);
        border-color: rgba(37, 99, 235, 0.2);
    }
}

html.dark .highlight {
    background: rgba(30, 41, 59, 0.6);
    border-color: rgba(37, 99, 235, 0.2);
}

/* Theme showcase in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .theme-tab {
        background: var(--color-background-alt);
        border-color: var(--color-border);
    }
}

html.dark .theme-tab {
    background: var(--color-background-alt);
    border-color: var(--color-border);
}

/* Gradient showcase in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .gradient-tab {
        background: var(--color-background-alt);
        border-color: var(--color-border);
    }
}

html.dark .gradient-tab {
    background: var(--color-background-alt);
    border-color: var(--color-border);
}

/* Roadmap items in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .roadmap-item {
        background: rgba(30, 41, 59, 0.6);
        border-color: rgba(37, 99, 235, 0.15);
    }
}

html.dark .roadmap-item {
    background: rgba(30, 41, 59, 0.6);
    border-color: rgba(37, 99, 235, 0.15);
}

/* Research section in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .research-hero {
        background:
            radial-gradient(circle at 30% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
            radial-gradient(circle at 70% 50%, rgba(124, 58, 237, 0.07) 0%, transparent 50%),
            var(--color-background);
    }
}

html.dark .research-hero {
    background:
        radial-gradient(circle at 30% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(124, 58, 237, 0.07) 0%, transparent 50%),
        var(--color-background);
}

/* Study cards in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .study-card {
        background: var(--color-background-alt);
        border-color: var(--color-border);
    }

    :root:not(.light) .header-static {
        background-color: var(--color-background);
        border-bottom-color: var(--color-border);
    }
}

html.dark .study-card {
    background: var(--color-background-alt);
    border-color: var(--color-border);
}

html.dark .header-static {
    background-color: var(--color-background);
    border-bottom-color: var(--color-border);
}

/* Nav link in dark mode */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .nav-link {
        color: var(--color-text);
    }
}

html.dark .nav-link {
    color: var(--color-text);
}

/* Language switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: none;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    line-height: 1;
}

.lang-switcher:hover {
    background: var(--color-background-alt);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Dark mode toggle button */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: all var(--transition-fast);
    font-size: 1.2rem;
    padding: 0;
    line-height: 1;
}

.theme-toggle:hover {
    background: var(--color-background-alt);
    border-color: var(--color-primary);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    display: none;
}

/* Default (light) state: show moon icon */
.theme-toggle .icon-moon {
    display: inline;
}

/* Dark state: show sun icon */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .theme-toggle .icon-moon {
        display: none;
    }
    :root:not(.light) .theme-toggle .icon-sun {
        display: inline;
    }
}

html.dark .theme-toggle .icon-moon {
    display: none;
}

html.dark .theme-toggle .icon-sun {
    display: inline;
}

html.light .theme-toggle .icon-moon {
    display: inline;
}

html.light .theme-toggle .icon-sun {
    display: none;
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* ==========================================================================
   Cookie Consent Banner
   ========================================================================== */

.cookie-banner {
    position: fixed;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    max-width: 480px;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    padding: var(--spacing-xl);
    z-index: 10000;
    animation: cookieSlideUp 0.3s ease-out;
}

@keyframes cookieSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.cookie-banner-text {
    font-size: var(--font-size-sm);
    color: var(--color-text);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-lg);
}

.cookie-banner-text a {
    color: var(--color-primary);
    text-decoration: underline;
}

.cookie-banner-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.cookie-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid var(--color-border);
}

.cookie-btn-accept {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.cookie-btn-accept:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.cookie-btn-decline {
    background: transparent;
    color: var(--color-text);
}

.cookie-btn-decline:hover {
    background: var(--color-background-alt);
}

@media (max-width: 480px) {
    .cookie-banner {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
        padding: var(--spacing-lg);
    }
}