:root {
    /* Base Variables - Light Mode (Anthropic Inspired) */
    --bg-main: #F3F1E9;
    /* Warm Beige */
    --bg-card: #FFFFFF;
    --bg-overlay: rgba(255, 255, 255, 0.9);
    --text-primary: #191919;
    --text-secondary: #565656;
    --text-tertiary: #8f8f8f;
    --accent: #D96C53;
    /* Warm Burnt Orange/Coral */
    --accent-glow: rgba(217, 108, 83, 0.2);
    --border: #E0DEC8;
    --border-hover: #C0BEA8;
    --font-heading: 'Merriweather', 'Georgia', serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
    /* Dark Mode (Refined) */
    --bg-main: #191919;
    --bg-card: #222222;
    /* Slightly Lighter Charcoal */
    --bg-overlay: rgba(30, 30, 30, 0.9);
    --text-primary: #EDEDED;
    --text-secondary: #A1A1A1;
    --text-tertiary: #666666;
    --accent: #4D9F7E;
    /* Soft Teal/Green (More sophisticated than neon) */
    --accent-glow: rgba(77, 159, 126, 0.2);
    --border: #333333;
    --border-hover: #444444;
    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 2rem;
}

h2 {
    font-size: 2.2rem;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.2rem;
    font-family: var(--font-body);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 5%;
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--bg-main);
    /* Match bg */
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: background-color 0.3s;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.version {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
}

.controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: 5px;
    border-radius: 50%;
    transition: color 0.2s, background 0.2s;
}

.icon-btn:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.05);
}

/* Buttons */
.btn {
    padding: 0.7rem 1.4rem;
    border-radius: 8px;
    /* Softer radius */
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-main);
}

.btn-primary:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    border-color: var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.03);
}

/* Hero */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 20px 40px;
    background: radial-gradient(circle at 50% 50%, rgba(217, 108, 83, 0.03) 0%, transparent 60%);
}

[data-theme="dark"] .hero {
    background: radial-gradient(circle at 50% 50%, rgba(77, 159, 126, 0.05) 0%, transparent 60%);
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-card);
}

.highlight {
    color: var(--accent);
    font-weight: 600;
    position: relative;
    display: inline-block;
}

/* Showcase Grid */
.showcase {
    padding: 4rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    /* Rounder corners */
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: var(--shadow-card);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--border-hover);
}

.visual-container {
    height: 240px;
    background: #111;
    /* Keep visuals dark for contrast/realism */
    position: relative;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.card-content {
    padding: 2rem;
}

.code {
    font-family: var(--font-mono);
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--accent);
    font-size: 0.85rem;
}

[data-theme="dark"] .code {
    background: rgba(255, 255, 255, 0.1);
}

/* Setup & FAQ Containers */
.setup-container,
.faq-container {
    max-width: 800px;
    margin: 120px auto 60px;
    padding: 0 20px;
}

.step,
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    box-shadow: var(--shadow-card);
}

.step {
    padding-left: 90px;
}

.step-number {
    position: absolute;
    left: 2rem;
    top: 2rem;
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-family: var(--font-heading);
}

.faq-question {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.modal-backdrop.active {
    opacity: 1;
    pointer-events: all;
}

.tos-modal {
    background: var(--bg-card);
    width: 90%;
    max-width: 650px;
    height: 85vh;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.tos-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tos-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    background: var(--bg-main);
}

.tos-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 4rem 5% 2rem;
    margin-top: auto;
    background: var(--bg-card);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--text-secondary);
    margin-left: 2rem;
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--accent);
}

/* Animation Elements (Keep existing classes, adjust colors via vars) */
/* Animation Elements - Removed to prevent conflicts with specific visualization styles below */

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    /* Simplified mobile nav for now */
    .step {
        padding: 1.5rem;
        text-align: center;
    }

    .step-number {
        position: relative;
        margin: 0 auto 1rem;
        left: 0;
        top: 0;
    }

    .visual-container {
        height: auto;
        /* Allow auto height on mobile if needed */
        min-height: 240px;
    }
}

/* --- Feature Card Visualization Styles --- */

/* Utilities */
.hidden {
    opacity: 0 !important;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.visual-container {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #eee;
    /* Always dark bg, so light text */
    flex-direction: column;
}

.keyboard-hint {
    position: absolute;
    bottom: 10px;
    right: 15px;
    font-size: 0.75rem;
    color: #bbb;
    background: rgba(0, 0, 0, 0.6);
    padding: 4px 8px;
    border-radius: 4px;
    pointer-events: none;
    z-index: 100 !important;
    /* Force on top */
}

.key {
    border: 1px solid #555;
    padding: 1px 4px;
    border-radius: 3px;
    background: #222;
    color: #AAA;
}

/* 1. Extract & General Browser Mock */
.mock-browser {
    width: 85%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mock-question {
    background: #222;
    padding: 10px;
    border-radius: 6px;
    border-left: 3px solid #444;
    transition: all 0.3s;
}

.mock-question.q-solved {
    border-left-color: var(--accent);
    background: rgba(var(--accent-rgb), 0.1);
    /* Fallback or complex var usage? Keep simple */
    background: #1a1a1a;
    color: var(--accent);
}

/* 2. Stealth Overlay */
.mock-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    z-index: 50;
    /* Middle layer */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: opacity 0.5s ease;
    opacity: 1;
}

.mock-page-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    justify-content: center;
    align-items: center;
    z-index: 1;
    /* Bottom layer */
}

.mock-line {
    height: 10px;
    background: #333;
    border-radius: 5px;
    opacity: 0.5;
}

.overlay-header {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.overlay-status {
    color: #0f0;
    font-family: monospace;
}

/* 3. Auto Progress */
.mock-progress-bar {
    width: 80%;
    height: 8px;
    background: #333;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s linear;
}

.progress-text {
    color: #888;
    font-size: 0.8rem;
}

/* 4. Quick Answer (Double Click) */
.mock-question-interactive {
    background: #222;
    padding: 15px;
    border-radius: 8px;
    width: 85%;
    position: relative;
}

.q-text {
    margin-bottom: 10px;
    font-weight: 600;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.option {
    padding: 6px 10px;
    background: #2a2a2a;
    border-radius: 4px;
    cursor: default;
    border: 1px solid transparent;
    transition: all 0.2s;
}

.option.correct {
    /* Semantic class for logic, no visual change until selected */
    border-color: transparent;
}

.option.selected {
    background: rgba(77, 159, 126, 0.15);
    /* Greenish tint */
    border-color: var(--accent);
    color: var(--accent);
}

.cursor {
    display: inline-block;
    width: 6px;
    /* Adjust as needed */
    color: var(--accent);
    animation: blink 1s step-end infinite;
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

.mock-status-box {
    position: absolute;
    top: -40px;
    right: 0;
    background: var(--accent);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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

/* Cursor */
.cursor-pointer,
.cursor-pointer-context {
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 16px solid white;
    position: absolute;
    transform: rotate(-30deg);
    top: 100px;
    left: 100px;
    z-index: 20;
    transition: top 0.5s ease, left 0.5s ease, transform 0.1s;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
}

.cursor-pointer::after,
.cursor-pointer-context::after {
    /* Simulate standard pointer shape slightly better */
    content: '';
    position: absolute;
    top: 0;
    left: -10px;
    width: 0;
    height: 0;
}

.cursor-pointer.clicking,
.cursor-pointer-context.clicking {
    transform: rotate(-30deg) scale(0.8);
}

/* 5. Context Menu */
.mock-text-selection {
    background: #222;
    padding: 10px;
    border-radius: 4px;
    color: #888;
}

.mock-context-menu {
    position: absolute;
    top: 80px;
    /* Animated via script? or fixed? Script toggles hidden */
    left: 120px;
    background: #333;
    border: 1px solid #555;
    border-radius: 6px;
    padding: 5px 0;
    width: 140px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 15;
    display: flex;
    flex-direction: column;
}

.menu-item {
    padding: 6px 15px;
    cursor: default;
    color: #ccc;
    font-size: 0.8rem;
    transition: background 0.1s;
}

.menu-item:hover,
.menu-item.highlight {
    background: var(--accent);
    color: #fff;
}

.mock-global-panel {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: #222;
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 15px;
    width: 200px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
    z-index: 5;
}

.panel-header {
    color: var(--accent);
    font-weight: 700;
    font-size: 0.8rem;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.panel-body {
    font-size: 0.75rem;
    color: #ccc;
    line-height: 1.4;
}

/* 6. Essay Assistant */
.editor-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    display: flex;
    gap: 5px;
    z-index: 20;
}

.toggle-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #888;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.mock-editor-container {
    width: 90%;
    height: 70%;
    margin-top: 30px;
    background: #1a1a1a;
    border-radius: 8px;
    border: 1px solid #333;
    overflow: hidden;
    position: relative;
}

.mock-editor-area {
    padding: 15px;
    height: 100%;
    width: 100%;
    position: relative;
}

.typing-area {
    color: #ddd;
    font-family: var(--font-body);
    font-size: 0.85rem;
    line-height: 1.5;
}

.glass-overlay {
    position: absolute;
    top: 15px;
    /* Offset to simulate being inside */
    left: 15px;
    right: 15px;
    height: auto;
    min-height: 60px;
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    border-left: 3px solid var(--accent);
}

.tag {
    font-size: 0.65rem;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.suggestion-text {
    font-size: 0.8rem;
    color: #eee;
    line-height: 1.3;
}