/* ========================================
   AI Carrier Official Site — Apple Style Dark Theme
   ======================================== */

:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-elevated: #111111;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --bg-glass: rgba(0, 0, 0, 0.72);

    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-muted: #6e6e73;

    --accent-blue: #2997ff;
    --accent-purple: #bf5af2;
    --accent-green: #30d158;
    --accent-gradient: linear-gradient(135deg, #2997ff 0%, #bf5af2 50%, #ff375f 100%);
    --accent-gradient-subtle: linear-gradient(135deg, rgba(41, 151, 255, 0.15), rgba(191, 90, 242, 0.15));

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.12);

    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;

    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

::selection {
    background: rgba(41, 151, 255, 0.3);
    color: #fff;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Typography
   ======================================== */

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-eyebrow {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.section-desc {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.7;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header .section-desc {
    margin: 0 auto;
}

/* ========================================
   Navbar
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 52px;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
    background: var(--bg-glass);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    box-shadow: 0 1px 0 var(--border-subtle);
}

.nav-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.logo-icon {
    font-size: 14px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 400;
    transition: color 0.2s ease;
    letter-spacing: 0.01em;
}

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

.nav-cta {
    display: inline-flex;
    align-items: center;
    padding: 7px 18px;
    background: var(--accent-blue);
    color: #fff;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    border-radius: 980px;
    transition: all 0.2s ease;
}

.nav-cta:hover {
    background: #1a85e0;
    transform: scale(1.02);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
}

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg-primary);
}

.hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 24px;
    max-width: 900px;
}

.hero-eyebrow {
    font-size: 15px;
    font-weight: 500;
    color: var(--accent-blue);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(52px, 10vw, 96px);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 28px;
}

.hero-subtitle {
    font-size: clamp(17px, 2.5vw, 21px);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 48px;
    font-weight: 300;
}

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

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--accent-blue);
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border-radius: 980px;
    transition: all 0.3s var(--ease-out);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: #1a85e0;
    transform: scale(1.04);
    box-shadow: 0 4px 24px rgba(41, 151, 255, 0.3);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: transparent;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border-radius: 980px;
    border: 1px solid var(--border-light);
    transition: all 0.3s var(--ease-out);
    cursor: pointer;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.25);
    transform: scale(1.04);
}

.btn-large {
    padding: 17px 36px;
    font-size: 17px;
}

.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ========================================
   Concept Section
   ======================================== */

.concept {
    padding: 160px 0;
    background: var(--bg-primary);
    position: relative;
}

.concept::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(41, 151, 255, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.value-card {
    padding: 40px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    transition: all 0.4s var(--ease-out);
}

.value-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-4px);
}

.value-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: var(--accent-gradient-subtle);
    color: var(--accent-blue);
    margin-bottom: 24px;
}

.value-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.value-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Architecture Section
   ======================================== */

.architecture {
    padding: 160px 0;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.architecture::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(191, 90, 242, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.arch-visual {
    margin-bottom: 64px;
}

.arch-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.arch-layer {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.arch-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 20px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    transition: all 0.3s var(--ease-out);
    min-width: 140px;
}

.arch-node:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.arch-node .arch-icon {
    font-size: 20px;
    color: var(--accent-blue);
}

.arch-node span {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.arch-node small {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
}

.arch-main {
    background: var(--accent-gradient-subtle);
    border-color: rgba(41, 151, 255, 0.2);
    padding: 24px 40px;
}

.arch-main .arch-icon {
    font-size: 24px;
}

.arch-main span {
    font-size: 16px;
}

.arch-connector {
    display: flex;
    justify-content: center;
    padding: 12px 0;
}

.arch-line {
    width: 1px;
    height: 32px;
    background: linear-gradient(to bottom, var(--border-light), var(--border-subtle));
}

.arch-roles {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.role-item {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    transition: all 0.3s var(--ease-out);
}

.role-item:hover {
    background: var(--bg-card-hover);
}

.role-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.role-badge.carrier {
    background: rgba(41, 151, 255, 0.15);
    color: var(--accent-blue);
}

.role-badge.command {
    background: rgba(191, 90, 242, 0.15);
    color: var(--accent-purple);
}

.role-badge.plane {
    background: rgba(48, 209, 88, 0.15);
    color: var(--accent-green);
}

.role-badge.skill {
    background: rgba(255, 55, 95, 0.15);
    color: #ff375f;
}

.role-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Modules Section
   ======================================== */

.modules {
    padding: 160px 0;
    background: var(--bg-primary);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.module-card {
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    transition: all 0.4s var(--ease-out);
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.module-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-4px);
}

.module-card:hover::before {
    opacity: 1;
}

.module-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(41, 151, 255, 0.08);
    color: var(--accent-blue);
    margin-bottom: 20px;
}

.module-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.module-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

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

.stats {
    padding: 120px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-number {
    font-size: clamp(48px, 6vw, 72px);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-suffix {
    font-size: clamp(28px, 3vw, 40px);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    font-size: 15px;
    color: var(--text-secondary);
    margin-top: 12px;
    font-weight: 400;
}

/* ========================================
   Tech Section
   ======================================== */

.tech {
    padding: 160px 0;
    background: var(--bg-primary);
}

.tech-stack {
    margin-top: 60px;
}

.tech-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 60px;
}

.tech-tag {
    padding: 10px 22px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.tech-pipeline {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.pipeline-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 24px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    min-width: 160px;
    transition: all 0.3s var(--ease-out);
}

.pipeline-step:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.pipeline-num {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: 1px;
}

.pipeline-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.pipeline-step small {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
}

.pipeline-arrow {
    font-size: 18px;
    color: var(--text-muted);
}

/* ========================================
   CTA Section
   ======================================== */

.cta {
    padding: 180px 0;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 700px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(41, 151, 255, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.cta-desc {
    font-size: 19px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-weight: 300;
}

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

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

.footer {
    padding: 60px 0 40px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.footer-tagline {
    font-size: 14px;
    color: var(--text-muted);
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    text-decoration: none;
    padding: 4px 0;
    transition: color 0.2s ease;
}

.footer-col a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-subtle);
}

.footer-bottom p {
    font-size: 12px;
    color: var(--text-muted);
}

/* ========================================
   Animations
   ======================================== */

.fade-in {
    opacity: 0;
    transform: translateY(24px);
    animation: fadeInUp 0.8s var(--ease-out) forwards;
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.25s; }
.fade-in:nth-child(3) { animation-delay: 0.4s; }
.fade-in:nth-child(4) { animation-delay: 0.55s; }
.fade-in:nth-child(5) { animation-delay: 0.7s; }

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

.fade-up {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

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

@media (max-width: 1023px) {
    .value-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .module-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .arch-roles {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px 24px;
    }

    .tech-pipeline {
        gap: 12px;
    }

    .pipeline-arrow {
        display: none;
    }

    .pipeline-step {
        min-width: 140px;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
}

@media (max-width: 767px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 52px;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border-subtle);
    }

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

    .nav-actions {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: translateY(6.5px) rotate(45deg);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-6.5px) rotate(-45deg);
    }

    .hero-title {
        font-size: clamp(40px, 12vw, 64px);
    }

    .section-header {
        margin-bottom: 48px;
    }

    .concept,
    .architecture,
    .modules,
    .tech,
    .cta {
        padding: 100px 0;
    }

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

    .arch-roles {
        grid-template-columns: 1fr;
    }

    .arch-node {
        min-width: 120px;
        padding: 16px 20px;
    }

    .pipeline-step {
        min-width: 120px;
        padding: 16px 20px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1;
        transform: none;
        animation: none;
    }

    .fade-up {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .scroll-line {
        animation: none;
    }
}