/* ============================================
   AI-Powered Humans - Stylesheet
   ============================================ */

/* CSS Variables */
:root {
    --color-bg-primary: #faf9f7;
    --color-bg-dark: #1a1a2e;
    --color-bg-accent: #f0ebe3;
    --color-text-primary: #2d2d3a;
    --color-text-secondary: #5a5a6e;
    --color-text-light: #8a8a9e;
    --color-text-on-dark: #e8e6e1;
    --color-accent: #c17817;
    --color-accent-light: #d4953a;
    --color-accent-dark: #9a5f12;
    --color-border: #e0dbd3;
    --color-border-dark: #3a3a4e;
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-accent-dark);
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 249, 247, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: 1.1rem;
}

.logo-icon {
    color: var(--color-accent);
    font-size: 1.3rem;
}

.logo-text {
    font-family: var(--font-heading);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 6px;
}

.nav-link {
    display: block;
    padding: 8px 14px;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: rgba(0,0,0,0.04);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 24px 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(193, 120, 23, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 700px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(193, 120, 23, 0.1);
    color: var(--color-accent);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 100px;
    margin-bottom: 28px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--color-text-primary);
}

.hero-title em {
    font-style: italic;
    color: var(--color-accent);
}

.hero-title .highlight {
    position: relative;
    display: inline-block;
}

.hero-title .highlight::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    height: 8px;
    background: rgba(193, 120, 23, 0.2);
    border-radius: 4px;
    z-index: -1;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font-body);
}

.btn-primary {
    background: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

/* Hero Visual */
.hero-visual {
    position: absolute;
    bottom: 40px;
    right: 40px;
    opacity: 0.15;
    pointer-events: none;
}

.human-ai-symbol {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 3rem;
}

.human-figure, .ai-figure {
    font-size: 2.5rem;
}

.connection-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-text-light));
}

.symbol-caption {
    text-align: center;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    margin-top: 8px;
    color: var(--color-text-light);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: 100px 0;
    position: relative;
}

.section-light {
    background: var(--color-bg-primary);
}

.section-dark {
    background: var(--color-bg-dark);
    color: var(--color-text-on-dark);
}

.section-dark .section-title,
.section-dark h3,
.section-dark h4 {
    color: var(--color-text-on-dark);
}

.section-dark .section-intro,
.section-dark p {
    color: rgba(232, 230, 225, 0.75);
}

.section-accent {
    background: var(--color-bg-accent);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-number {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    margin-bottom: 12px;
}

.section-intro {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ============================================
   PHILOSOPHY GRID
   ============================================ */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.philosophy-card {
    background: white;
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.philosophy-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.philosophy-card.featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, #fff 0%, #faf7f2 100%);
    border-color: rgba(193, 120, 23, 0.2);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    opacity: 0.8;
}

.philosophy-card h3 {
    font-size: 1.25rem;
    margin-bottom: 14px;
    color: var(--color-text-primary);
}

.philosophy-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.philosophy-card strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* ============================================
   RESEARCH TIMELINE
   ============================================ */
.research-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.research-item {
    display: flex;
    gap: 28px;
    padding: 32px 0;
    border-bottom: 1px solid var(--color-border-dark);
}

.research-item:last-child {
    border-bottom: none;
}

.research-marker {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(193, 120, 23, 0.15);
    color: var(--color-accent-light);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 50%;
    border: 2px solid rgba(193, 120, 23, 0.3);
}

.research-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--color-text-on-dark);
}

.research-content p {
    color: rgba(232, 230, 225, 0.7);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 16px;
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 4px 12px;
    background: rgba(255,255,255,0.08);
    color: rgba(232, 230, 225, 0.7);
    font-size: 0.8rem;
    border-radius: 100px;
    border: 1px solid rgba(255,255,255,0.1);
}

/* ============================================
   CASE STUDY
   ============================================ */
.case-study {
    max-width: 900px;
    margin: 0 auto;
}

.case-origin {
    margin-bottom: 48px;
}

.case-origin h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--color-text-primary);
}

blockquote {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-text-primary);
    padding: 28px 32px;
    background: white;
    border-left: 4px solid var(--color-accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-bottom: 24px;
    line-height: 1.7;
    box-shadow: var(--shadow-sm);
}

blockquote strong {
    font-weight: 700;
    color: var(--color-accent-dark);
}

.case-context {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.case-context strong {
    color: var(--color-text-primary);
}

/* Clarification Box */
.clarification-box {
    background: linear-gradient(135deg, #2d2d3a 0%, #1a1a2e 100%);
    color: var(--color-text-on-dark);
    padding: 36px;
    border-radius: var(--radius-lg);
    margin-bottom: 48px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.clarification-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    opacity: 0.9;
}

.clarification-box h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--color-accent-light);
}

.clarification-box p {
    color: rgba(232, 230, 225, 0.8);
    line-height: 1.8;
}

.clarification-box strong {
    color: var(--color-text-on-dark);
}

/* Features Grid */
.case-features h3 {
    font-size: 1.4rem;
    margin-bottom: 28px;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 48px;
}

.feature-card {
    background: white;
    padding: 28px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.feature-number {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.feature-card h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--color-text-primary);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* Case Vision */
.case-vision {
    background: white;
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.case-vision h3 {
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.case-vision p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto;
}

.case-vision strong {
    color: var(--color-text-primary);
}

/* ============================================
   OPPORTUNITIES
   ============================================ */
.opportunities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.opportunity-card {
    background: white;
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.opportunity-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.opportunity-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.opportunity-icon {
    font-size: 1.8rem;
}

.opportunity-header h3 {
    font-size: 1.15rem;
    color: var(--color-text-primary);
}

.opportunity-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.opportunity-card strong {
    color: var(--color-text-primary);
}

/* ============================================
   PROJECTS
   ============================================ */
.projects-list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.project-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border-dark);
    padding: 36px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.project-item:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(193, 120, 23, 0.3);
}

.project-status {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(193, 120, 23, 0.15);
    color: var(--color-accent-light);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 100px;
    margin-bottom: 16px;
}

.project-item h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: var(--color-text-on-dark);
}

.project-item p {
    color: rgba(232, 230, 225, 0.7);
    line-height: 1.8;
    margin-bottom: 16px;
}

.project-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: rgba(232, 230, 225, 0.5);
}

.meta-label {
    color: var(--color-accent-light);
    font-weight: 600;
}

/* ============================================
   REFLECTIONS
   ============================================ */
.reflections {
    max-width: 800px;
    margin: 0 auto 64px;
}

.reflection-item {
    padding: 32px 0;
    border-bottom: 1px solid var(--color-border);
}

.reflection-item:last-child {
    border-bottom: none;
}

.reflection-item h3 {
    font-size: 1.3rem;
    margin-bottom: 14px;
    color: var(--color-text-primary);
}

.reflection-item p {
    color: var(--color-text-secondary);
    line-height: 1.9;
}

.reflection-item strong {
    color: var(--color-text-primary);
}

/* Closing Quote */
.closing-thought {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.closing-quote {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-style: italic;
    color: var(--color-text-primary);
    padding: 36px;
    background: linear-gradient(135deg, #f0ebe3 0%, #faf7f2 100%);
    border-radius: var(--radius-lg);
    border: none;
    line-height: 1.7;
}

/* ============================================
   FOOTER
   ============================================ */
.main-footer {
    background: var(--color-bg-dark);
    color: var(--color-text-on-dark);
    padding: 60px 0 40px;
    border-top: 1px solid var(--color-border-dark);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
    font-size: 1.2rem;
    font-weight: 600;
}

.footer-brand .logo-icon {
    color: var(--color-accent);
}

.footer-brand .logo-text {
    font-family: var(--font-heading);
}

.footer-description {
    color: rgba(232, 230, 225, 0.6);
    max-width: 500px;
    margin: 0 auto 24px;
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer-meta {
    color: rgba(232, 230, 225, 0.4);
    font-size: 0.85rem;
}

.footer-date {
    margin-top: 8px;
    font-style: italic;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(250, 249, 247, 0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding-top: 80px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 320px;
        justify-content: center;
    }

    .section {
        padding: 60px 0;
    }

    .clarification-box {
        flex-direction: column;
        text-align: center;
    }

    .research-item {
        flex-direction: column;
        gap: 16px;
    }

    .project-meta {
        flex-direction: column;
        gap: 8px;
    }

    .hero-visual {
        display: none;
    }
}

@media (max-width: 480px) {
    .philosophy-card,
    .opportunity-card,
    .feature-card,
    .project-item,
    .case-vision {
        padding: 24px;
    }

    blockquote {
        padding: 20px 24px;
        font-size: 1.1rem;
    }

    .closing-quote {
        padding: 24px;
        font-size: 1.2rem;
    }
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-light);
}

/* ============================================
   SELECTION STYLING
   ============================================ */
::selection {
    background: rgba(193, 120, 23, 0.2);
    color: var(--color-text-primary);
}