/* =========================================================
   PQBR — Pioneer Quest Brain & Robotics
   Design Language: Deep Space Black + Neural Blue
   ========================================================= */

:root {
    /* Colors */
    --color-bg: #0A0A0F;
    --color-bg-elevated: #12121A;
    --color-text: #FFFFFF;
    --color-text-muted: #8A8A9A;
    --color-text-subtle: #5A5A6A;
    --color-accent: #4A9EFF;
    --color-accent-glow: rgba(74, 158, 255, 0.4);
    --color-accent-dim: rgba(74, 158, 255, 0.1);
    --color-border: #1F1F2A;
    --color-border-bright: #2A2A38;

    /* Fonts */
    --font-display: 'Inter', 'Noto Sans SC', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --max-width: 1280px;
    --space-section: 120px;
    --space-gap: 24px;
}

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

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

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.5;
    overflow-x: hidden;
    position: relative;
}

/* Neural Canvas Background */
#neural-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: 0.5;
}

section, nav, footer {
    position: relative;
    z-index: 1;
}

a {
    color: inherit;
    text-decoration: none;
}

/* =========================================================
   Layout
   ========================================================= */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

/* =========================================================
   Navigation
   ========================================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 0;
    background: linear-gradient(180deg, rgba(10, 10, 15, 0.95) 0%, rgba(10, 10, 15, 0) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: 0.05em;
}

.logo-img {
    height: 32px;
    width: 32px;
    object-fit: cover;
    border-radius: 6px;
    background: white;
    padding: 2px;
}

.logo-divider {
    color: var(--color-text-subtle);
    font-weight: 300;
    font-size: 18px;
    margin: 0 4px;
}

.footer-logo-img {
    height: 24px;
    width: 24px;
    object-fit: cover;
    border-radius: 4px;
    background: white;
    padding: 2px;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

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

.nav-links a {
    font-size: 14px;
    color: var(--color-text-muted);
    transition: color 0.2s ease;
    font-weight: 500;
}

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

/* =========================================================
   Hero Section
   ========================================================= */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 32px 80px;
    position: relative;
}

.hero-content {
    max-width: 1200px;
}

.hero-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-accent);
    letter-spacing: 0.3em;
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeInUp 1s 0.2s forwards;
}

.hero-title {
    font-size: clamp(64px, 12vw, 180px);
    font-weight: 900;
    line-height: 0.95;
    letter-spacing: -0.04em;
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.title-line {
    display: block;
    opacity: 0;
    animation: fadeInUp 1s forwards;
}

.title-brain {
    animation-delay: 0.4s;
    background: linear-gradient(180deg, #FFFFFF 0%, #B0B0C0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-cross {
    font-size: 0.4em;
    color: var(--color-accent);
    margin: -20px 0;
    animation-delay: 0.6s;
    opacity: 0;
    animation: fadeInUp 1s 0.6s forwards;
    font-weight: 300;
}

.title-robotics {
    animation-delay: 0.8s;
    color: var(--color-accent);
    text-shadow: 0 0 60px var(--color-accent-glow);
}

.hero-subtitle {
    font-size: clamp(20px, 2.5vw, 28px);
    color: var(--color-text);
    font-weight: 300;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    opacity: 0;
    animation: fadeInUp 1s 1s forwards;
}

.hero-subtitle-en {
    font-size: clamp(14px, 1.5vw, 16px);
    color: var(--color-text-muted);
    font-weight: 300;
    letter-spacing: 0.05em;
    margin-bottom: 60px;
    opacity: 0;
    animation: fadeInUp 1s 1.2s forwards;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 1s 1.4s forwards;
}

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.05em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: #6BB3FF;
    box-shadow: 0 0 30px var(--color-accent-glow);
    transform: translateY(-2px);
}

.btn-primary .arrow {
    transition: transform 0.3s ease;
}

.btn-primary:hover .arrow {
    transform: translateX(4px);
}

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

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0;
    animation: fadeInUp 1s 1.8s forwards;
}

.hero-scroll-hint span {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-subtle);
    letter-spacing: 0.3em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-accent) 0%, transparent 100%);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(20px); opacity: 0; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   Section Common
   ========================================================= */
section {
    padding: var(--space-section) 0;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-accent);
    letter-spacing: 0.3em;
    margin-bottom: 24px;
}

.section-title {
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 80px;
    background: linear-gradient(180deg, #FFFFFF 0%, #A0A0B0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================================================
   Manifesto Section
   ========================================================= */
.manifesto {
    border-top: 1px solid var(--color-border);
}

.manifesto-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 80px;
    align-items: start;
}

.manifesto-text p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: 24px;
}

.manifesto-lead {
    font-size: 24px !important;
    font-weight: 300;
    color: var(--color-text) !important;
    line-height: 1.5 !important;
    margin-bottom: 32px !important;
}

.manifesto-text strong {
    color: var(--color-accent);
    font-weight: 600;
}

.manifesto-quote {
    padding: 40px;
    border-left: 2px solid var(--color-accent);
    background: var(--color-bg-elevated);
}

.manifesto-quote blockquote {
    font-size: 22px;
    font-weight: 300;
    line-height: 1.5;
    color: var(--color-text);
    margin-bottom: 24px;
    font-style: italic;
}

.manifesto-quote cite {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    font-style: normal;
}

/* =========================================================
   Frontier Section
   ========================================================= */
.frontier {
    border-top: 1px solid var(--color-border);
}

.frontier-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 40px;
    align-items: stretch;
}

.frontier-col {
    padding: 48px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    transition: all 0.3s ease;
}

.frontier-col:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.frontier-icon {
    margin-bottom: 32px;
}

.frontier-col h3 {
    font-size: 48px;
    font-weight: 900;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    color: var(--color-accent);
}

.frontier-col.frontier-brain h3 {
    color: #FFFFFF;
}

.frontier-sub {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-text-muted);
    letter-spacing: 0.15em;
    margin-bottom: 32px;
}

.frontier-col ul {
    list-style: none;
}

.frontier-col li {
    padding: 14px 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 16px;
}

.frontier-col li:last-child {
    border-bottom: 1px solid var(--color-border);
}

.frontier-bridge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.bridge-line {
    width: 1px;
    height: 80px;
    background: linear-gradient(180deg, transparent 0%, var(--color-accent) 50%, transparent 100%);
}

.bridge-symbol {
    font-size: 48px;
    color: var(--color-accent);
    font-weight: 300;
    text-shadow: 0 0 30px var(--color-accent-glow);
}

/* =========================================================
   Themes Section
   ========================================================= */
.themes {
    border-top: 1px solid var(--color-border);
}

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

.theme-card {
    padding: 40px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.theme-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 0;
    background: var(--color-accent);
    transition: height 0.4s ease;
}

.theme-card:hover {
    border-color: var(--color-accent-dim);
    transform: translateY(-4px);
}

.theme-card:hover::before {
    height: 100%;
}

.theme-num {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-accent);
    letter-spacing: 0.2em;
    margin-bottom: 24px;
}

.theme-card h4 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.theme-card p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.theme-status {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-accent);
    letter-spacing: 0.15em;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

/* =========================================================
   Big Quote Section
   ========================================================= */
.big-quote {
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 50%, var(--color-bg) 100%);
    padding: 160px 0;
    text-align: center;
}

.quote-text {
    font-size: clamp(32px, 5vw, 64px);
    font-weight: 300;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: 32px;
    font-style: italic;
}

.quote-author {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-text-muted);
    letter-spacing: 0.15em;
}

/* =========================================================
   Contact Section
   ========================================================= */
.contact {
    border-top: 1px solid var(--color-border);
}

.contact-intro {
    font-size: 20px;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: 64px;
    max-width: 720px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--color-border);
    border: 1px solid var(--color-border);
}

.contact-item {
    background: var(--color-bg);
    padding: 40px;
    transition: all 0.3s ease;
    display: block;
    cursor: pointer;
}

a.contact-item:hover {
    background: var(--color-bg-elevated);
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-accent);
    letter-spacing: 0.3em;
    margin-bottom: 16px;
}

.contact-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

a.contact-item:hover .contact-value {
    color: var(--color-accent);
}

/* =========================================================
   Footer
   ========================================================= */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.05em;
}

.footer-mark {
    color: var(--color-accent);
    font-size: 12px;
}

.footer-right {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

.footer-divider {
    margin: 0 12px;
    color: var(--color-text-subtle);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 968px) {
    :root {
        --space-section: 80px;
    }

    .container {
        padding: 0 24px;
    }

    .nav-links {
        display: none;
    }

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

    .frontier-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .frontier-bridge {
        flex-direction: row;
        padding: 20px 0;
    }

    .bridge-line {
        width: 80px;
        height: 1px;
        background: linear-gradient(90deg, transparent 0%, var(--color-accent) 50%, transparent 100%);
    }

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

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

@media (max-width: 640px) {
    .hero-title {
        font-size: clamp(48px, 16vw, 80px);
    }

    .title-cross {
        margin: -8px 0;
    }

    .section-title {
        font-size: 36px;
        margin-bottom: 48px;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}