/* =================================
   Recursively Curious - Main Stylesheet
   ================================= */

/* =================================
   1. Variables
   ================================= */
:root {
    /* Colors */
    --cream: #faf7f2;
    --paper: #f5f1ea;
    --ink: #1a1a2e;
    --ink-light: #3d3d5c;
    --ink-muted: #6b6b8a;
    --terracotta: #c4654a;
    --terracotta-soft: rgba(196, 101, 74, 0.12);
    --teal: #2d6a6a;
    --teal-soft: rgba(45, 106, 106, 0.1);

    /* Typography */
    --display: 'Fraunces', serif;
    --body: 'Source Serif 4', serif;

    /* Spacing */
    --space-xs: 12px;
    --space-sm: 20px;
    --space-md: 40px;
    --space-lg: 80px;
    --space-xl: 120px;

    /* Transitions */
    --transition-fast: 0.2s;
    --transition-base: 0.3s;
    --transition-slow: 0.8s;
}

/* =================================
   2. Reset & Base
   ================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--body);
    background: var(--cream);
    color: var(--ink);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Paper texture overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1000;
}

/* =================================
   3. Navigation
   ================================= */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm) var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: linear-gradient(to bottom, var(--cream), transparent);
}

.nav-logo {
    font-family: var(--display);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--ink);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-family: var(--display);
    font-size: 0.9rem;
    color: var(--ink-muted);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-base);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--terracotta);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--terracotta);
}

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

.back-link {
    font-family: var(--display);
    font-size: 0.9rem;
    color: var(--ink-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color var(--transition-base);
}

.back-link:hover {
    color: var(--terracotta);
}

/* =================================
   4. Hero Section
   ================================= */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    max-width: 1100px;
    margin: 0 auto;
}

.hero-question {
    font-family: var(--display);
    font-size: clamp(0.9rem, 1.5vw, 1rem);
    color: var(--terracotta);
    font-style: italic;
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeUp var(--transition-slow) 0.2s forwards;
}

.hero h1 {
    font-family: var(--display);
    font-size: clamp(3rem, 10vw, 7rem);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
    opacity: 0;
    animation: fadeUp var(--transition-slow) 0.4s forwards;
}

.hero h1 em {
    font-style: italic;
    color: var(--terracotta);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--ink-light);
    max-width: 580px;
    line-height: 1.8;
    opacity: 0;
    animation: fadeUp var(--transition-slow) 0.6s forwards;
}

.hero-arrow {
    margin-top: var(--space-lg);
    font-size: 2rem;
    color: var(--ink-muted);
    opacity: 0;
    animation: fadeUp var(--transition-slow) 0.8s forwards, float 2s 1.6s ease-in-out infinite;
}

/* Experiment hero (smaller) */
.hero.experiment-hero {
    min-height: 70vh;
    max-width: 900px;
}

.experiment-number {
    font-family: var(--display);
    font-size: 1rem;
    color: var(--terracotta);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeUp var(--transition-slow) 0.2s forwards;
}

.experiment-hero h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
    letter-spacing: -0.02em;
    margin-bottom: 32px;
}

/* =================================
   5. Section Layout
   ================================= */
section {
    padding: var(--space-xl) var(--space-md);
    max-width: 1100px;
    margin: 0 auto;
}

.section-intro {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    align-items: start;
}

.chapter-label {
    font-family: var(--display);
    font-size: 0.85rem;
    color: var(--terracotta);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    position: relative;
    padding-left: var(--space-md);
}

.chapter-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 28px;
    height: 1px;
    background: var(--terracotta);
}

.section-title {
    font-family: var(--display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 24px;
}

.section-lead {
    font-size: 1.15rem;
    color: var(--ink-light);
    line-height: 1.9;
}

/* =================================
   6. Story Sections (Experiments)
   ================================= */
.story-section {
    padding: var(--space-lg) var(--space-md);
    max-width: 800px;
    margin: 0 auto;
}

.story-section h2 {
    font-family: var(--display);
    font-size: 0.85rem;
    color: var(--terracotta);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 24px;
    position: relative;
    padding-left: var(--space-md);
}

.story-section h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 28px;
    height: 1px;
    background: var(--terracotta);
}

.story-content {
    font-size: 1.25rem;
    line-height: 2;
    color: var(--ink-light);
}

.story-content p {
    margin-bottom: 28px;
}

.story-content strong {
    color: var(--ink);
    font-weight: 500;
}

.story-content em {
    color: var(--terracotta);
    font-style: italic;
}

.pull-quote {
    font-family: var(--display);
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-style: italic;
    color: var(--ink);
    line-height: 1.5;
    padding: var(--space-md) 0;
    border-top: 1px solid var(--terracotta-soft);
    border-bottom: 1px solid var(--terracotta-soft);
    margin: 48px 0;
    position: relative;
}

.pull-quote::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: -20px;
    font-size: 4rem;
    color: var(--terracotta-soft);
    font-family: var(--display);
}

/* =================================
   7. Discovery Cards (Homepage)
   ================================= */
.discoveries {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-top: var(--space-lg);
}

.discovery-card {
    background: var(--paper);
    padding: var(--space-md);
    position: relative;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
}

.discovery-card::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border: 1px solid var(--terracotta);
    opacity: 0;
    transition: all 0.4s;
    pointer-events: none;
}

.discovery-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 30px 60px rgba(26, 26, 46, 0.1);
}

.discovery-card:hover::before {
    opacity: 1;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
}

.discovery-number {
    font-family: var(--display);
    font-size: 4rem;
    font-weight: 300;
    color: var(--terracotta-soft);
    line-height: 1;
    margin-bottom: var(--space-sm);
    transition: color var(--transition-base);
}

.discovery-card:hover .discovery-number {
    color: var(--terracotta);
}

.discovery-card h3 {
    font-family: var(--display);
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.discovery-card p {
    color: var(--ink-muted);
    line-height: 1.8;
}

.discovery-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: var(--space-sm);
    font-family: var(--display);
    font-size: 0.9rem;
    color: var(--terracotta);
}

.discovery-link svg {
    transition: transform var(--transition-base);
}

.discovery-card:hover .discovery-link svg {
    transform: translateX(4px);
}

/* Featured card */
.discovery-card.featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    background: linear-gradient(135deg, var(--paper) 0%, var(--teal-soft) 100%);
}

.discovery-card.featured .discovery-number {
    color: var(--teal);
}

/* Coming soon badge */
.coming-soon-badge {
    display: inline-block;
    font-family: var(--display);
    font-size: 0.7rem;
    color: var(--teal);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 10px;
    background: var(--teal-soft);
    margin-bottom: var(--space-xs);
}

.discovery-card.coming-soon {
    background: linear-gradient(135deg, var(--paper) 0%, var(--teal-soft) 50%);
}

.discovery-card.coming-soon .discovery-number {
    color: var(--teal-soft);
}

.discovery-card.coming-soon:hover .discovery-number {
    color: var(--teal);
}

/* =================================
   8. Work Section (Homepage)
   ================================= */
.work-layout {
    margin-top: var(--space-lg);
}

.work-intro {
    max-width: 700px;
    margin-bottom: 60px;
}

.work-intro h3 {
    font-family: var(--display);
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: var(--space-sm);
}

.work-intro p {
    color: var(--ink-light);
    line-height: 1.9;
}

.work-columns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.work-column h4 {
    font-family: var(--display);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--terracotta-soft);
}

.work-column ul {
    list-style: none;
}

.work-column li {
    padding: var(--space-xs) 0;
    color: var(--ink-muted);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    padding-left: var(--space-sm);
}

.work-column li::before {
    content: '?';
    position: absolute;
    left: 0;
    color: var(--terracotta);
    font-family: var(--display);
    font-style: italic;
}

/* =================================
   9. About Section (Homepage)
   ================================= */
.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-lg);
    margin-top: 60px;
}

.about-text {
    font-size: 1.15rem;
    line-height: 2;
    color: var(--ink-light);
}

.about-text p {
    margin-bottom: 28px;
}

.about-text strong {
    color: var(--ink);
    font-weight: 500;
}

.about-text em {
    color: var(--terracotta);
    font-style: italic;
}

.contact-card {
    background: var(--paper);
    padding: 48px;
    position: relative;
}

.contact-card::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: var(--space-md);
    font-family: var(--display);
    font-size: 8rem;
    color: var(--terracotta-soft);
    line-height: 1;
}

.contact-card h4 {
    font-family: var(--display);
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.contact-card p {
    color: var(--ink-muted);
    margin-bottom: 24px;
    line-height: 1.8;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--display);
    color: var(--terracotta);
    text-decoration: none;
    font-size: 1.1rem;
    transition: gap var(--transition-base);
}

.contact-link:hover {
    gap: 16px;
}

/* =================================
   10. CTA Section
   ================================= */
.cta-section {
    padding: 100px var(--space-md);
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.cta-section h2 {
    font-family: var(--display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 400;
    margin-bottom: 24px;
}

.cta-section > p {
    font-size: 1.15rem;
    color: var(--ink-light);
    margin-bottom: var(--space-md);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--terracotta);
    color: white;
    text-decoration: none;
    font-family: var(--display);
    font-size: 1.1rem;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background: var(--ink);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(26, 26, 46, 0.2);
}

.cta-button svg {
    transition: transform var(--transition-base);
}

.cta-button:hover svg {
    transform: translateX(4px);
}

/* =================================
   11. Forms & Signup
   ================================= */
.signup-form {
    background: var(--paper);
    padding: 48px;
    position: relative;
}

.signup-form::before {
    content: '';
    position: absolute;
    top: var(--space-xs);
    left: var(--space-xs);
    right: var(--space-xs);
    bottom: var(--space-xs);
    border: 1px solid var(--terracotta-soft);
    pointer-events: none;
}

.signup-form p {
    font-family: var(--display);
    font-size: 1rem;
    color: var(--ink-muted);
    margin-bottom: var(--space-sm);
}

.input-group {
    display: flex;
    gap: var(--space-xs);
}

.input-group input {
    flex: 1;
    padding: 16px var(--space-sm);
    font-family: var(--body);
    font-size: 1rem;
    border: 1px solid var(--ink-muted);
    background: var(--cream);
    color: var(--ink);
    outline: none;
    transition: border-color var(--transition-base);
}

.input-group input:focus {
    border-color: var(--terracotta);
}

.input-group input::placeholder {
    color: var(--ink-muted);
}

.input-group button {
    padding: 16px 28px;
    font-family: var(--display);
    font-size: 1rem;
    background: var(--terracotta);
    color: white;
    border: none;
    cursor: pointer;
    transition: background var(--transition-base), transform var(--transition-fast);
}

.input-group button:hover {
    background: var(--ink);
    transform: translateY(-2px);
}

.success-message {
    display: none;
    font-family: var(--display);
    color: var(--teal);
    margin-top: var(--space-sm);
    font-size: 1.1rem;
}

.privacy-note {
    font-size: 0.85rem;
    color: var(--ink-muted);
    margin-top: 16px;
}

/* =================================
   12. Vision Grid (Parts/Workout)
   ================================= */
.vision-section {
    padding: var(--space-lg) var(--space-md);
    max-width: 800px;
    margin: 0 auto;
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
    margin-top: var(--space-md);
}

.vision-card {
    background: var(--paper);
    padding: 32px;
    position: relative;
}

.vision-card::before {
    content: '';
    position: absolute;
    top: var(--space-xs);
    left: var(--space-xs);
    right: var(--space-xs);
    bottom: var(--space-xs);
    border: 1px solid var(--terracotta-soft);
    pointer-events: none;
}

.vision-card h3 {
    font-family: var(--display);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--ink);
}

.vision-card p {
    font-size: 1rem;
    color: var(--ink-muted);
    line-height: 1.7;
}

/* Status badge for coming soon pages */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--display);
    font-size: 0.85rem;
    color: var(--teal);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeUp var(--transition-slow) 0.2s forwards;
}

.status-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--teal);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

/* App Preview (side-by-side phone screenshots) */
.app-preview {
    display: flex;
    gap: 24px;
    justify-content: center;
    align-items: flex-start;
    margin-top: var(--space-md);
}

.app-preview img {
    max-width: 280px;
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(26, 26, 46, 0.15);
}

@media (max-width: 640px) {
    .app-preview {
        flex-direction: column;
        align-items: center;
    }

    .app-preview img {
        max-width: 260px;
    }
}

/* =================================
   13. Tech Footnote
   ================================= */
.tech-footnote {
    padding: 60px var(--space-md);
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid var(--terracotta-soft);
}

.tech-footnote summary {
    font-family: var(--display);
    font-size: 0.9rem;
    color: var(--ink-muted);
    cursor: pointer;
    list-style: none;
}

.tech-footnote summary::-webkit-details-marker {
    display: none;
}

.tech-footnote summary::before {
    content: '+ ';
    color: var(--terracotta);
}

.tech-footnote[open] summary::before {
    content: '− ';
}

.tech-content {
    margin-top: 24px;
    padding-left: var(--space-sm);
    font-size: 0.95rem;
    color: var(--ink-muted);
    line-height: 1.8;
}

.tech-content ul {
    list-style: none;
    margin-top: var(--space-xs);
}

.tech-content li {
    padding: 8px 0;
    padding-left: var(--space-sm);
    position: relative;
}

.tech-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--terracotta);
}

/* =================================
   14. Media Showcase
   ================================= */
.media-showcase {
    padding: 60px var(--space-md);
    max-width: 1000px;
    margin: 0 auto;
}

.media-showcase img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(26, 26, 46, 0.15);
}

.media-caption {
    font-family: var(--display);
    font-size: 0.9rem;
    color: var(--ink-muted);
    text-align: center;
    margin-top: 16px;
    font-style: italic;
}

/* =================================
   15. Footer
   ================================= */
footer {
    padding: 60px var(--space-md);
    text-align: center;
    font-family: var(--display);
    font-size: 0.9rem;
    color: var(--ink-muted);
}

footer a {
    color: var(--terracotta);
    text-decoration: none;
}

/* =================================
   16. Animations
   ================================= */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =================================
   17. Responsive
   ================================= */
@media (max-width: 768px) {
    /* Hide nav links on mobile - users can scroll to sections */
    .nav-links,
    .back-link {
        display: none;
    }

    nav {
        justify-content: center;
        transition: transform 0.3s ease, opacity 0.3s ease;
    }

    nav.nav-scrolled {
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
    }

    .section-intro {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .discovery-card.featured {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }

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

    .about-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 500px) {
    .input-group {
        flex-direction: column;
    }
}

/* =================================
   18. Voice Orb
   ================================= */
.voice-orb-container {
    width: 280px;
    height: 280px;
    margin: var(--space-sm) auto 0;
}

.voice-orb-container canvas {
    width: 100%;
    height: 100%;
}

/* =================================
   19. TSM Breathing Animation
   ================================= */
@keyframes breathe {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.media-showcase img.breathing {
    animation: breathe 6s ease-in-out infinite;
    mask-image: radial-gradient(ellipse 95% 90% at center, black 70%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 95% 90% at center, black 70%, transparent 100%);
}