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

:root {
    --bg: #0a0a0f;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --accent: #00d4ff;
    --accent-dim: #0099bb;
    --accent-r: 0;
    --accent-g: 212;
    --accent-b: 255;
    --text: #e8e8ec;
    --text-dim: #888899;
    --font: 'Inter', system-ui, -apple-system, sans-serif;
    --font-brand: 'Rajdhani', system-ui, sans-serif;
    --border: rgba(255, 255, 255, 0.08);
    --glow-accent: 0 0 40px rgba(0, 212, 255, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

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

/* ===== Navigation ===== */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text);
}

.nav-logo img {
    height: 32px;
    width: auto;
}

.nav-logo-text {
    font-family: var(--font-brand);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    color: var(--text);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.3s;
}

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

.nav-cta {
    padding: 0.5rem 1.2rem;
    border: 1px solid rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.4);
    background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.1);
    color: var(--accent) !important;
    font-family: var(--font);
    font-size: 0.6rem !important;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s;
}

.nav-cta:hover {
    background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.2);
    border-color: var(--accent);
}

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

.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-dim);
    transition: all 0.3s;
}

/* Mobile nav */
@media (max-width: 768px) {
    .nav-hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 15, 0.95);
        backdrop-filter: blur(16px);
        padding: 1.5rem 2rem;
        gap: 1.2rem;
        border-bottom: 1px solid var(--border);
    }

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

/* ===== 3D Hero Section ===== */
#hero-wrapper {
    position: relative;
    height: 200vh;
}

#hero-3d {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg);
}

#hero-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.hero-overlay {
    position: absolute;
    bottom: 15%;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.8s;
    width: 90%;
    max-width: 600px;
}

.hero-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.hero-tagline {
    font-family: var(--font);
    font-size: clamp(0.75rem, 2vw, 1rem);
    font-weight: 300;
    color: var(--text-dim);
    letter-spacing: 0.08em;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.7rem 2rem;
    font-family: var(--font);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.15);
    border: 1px solid rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.5);
    color: var(--accent);
}

.btn-primary:hover {
    background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.25);
    border-color: var(--accent);
    box-shadow: var(--glow-accent);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-dim);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text);
}

.scroll-hint {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font);
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    color: var(--text-dim);
    text-transform: uppercase;
    z-index: 11;
    pointer-events: none;
    animation: pulse-hint 2s ease-in-out infinite;
    transition: opacity 0.5s;
}

.scroll-hint.hidden {
    opacity: 0;
}

@keyframes pulse-hint {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.8; transform: translateX(-50%) translateY(-5px); }
}

/* ===== Sections ===== */
.section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

.section-title {
    font-family: var(--font-brand);
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
    line-height: 1.8;
    margin-bottom: 3rem;
    max-width: 600px;
}

/* ===== Card Grid ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: background 0.3s, border-color 0.3s, box-shadow 0.3s, transform 0.3s;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    text-decoration: none;
    color: var(--text);
    display: block;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.25);
    box-shadow: var(--glow-accent);
    transform: translateY(-4px);
}

.card-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 1.2rem;
    color: var(--accent);
}

.card-icon svg {
    width: 100%;
    height: 100%;
}

.card-title {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    margin-bottom: 0.6rem;
}

.card-desc {
    font-size: 0.7rem;
    color: var(--text-dim);
    line-height: 1.7;
    letter-spacing: 0.03em;
}

/* ===== Features Section ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Team Section ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

@media (max-width: 900px) {
    .team-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.team-card:hover {
    border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.25);
    box-shadow: var(--glow-accent);
    transform: translateY(-4px);
}

.team-photo-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
}

.team-photo-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.5s;
}

.team-photo-wrapper .team-photo-alt {
    position: absolute;
    inset: 0;
    opacity: 0;
}

.team-card:hover .team-photo-alt {
    opacity: 1;
}

.team-info {
    padding: 1.5rem;
    position: relative;
}

.team-info-default,
.team-info-hover {
    transition: opacity 0.4s;
}

.team-info-hover {
    position: absolute;
    inset: 0;
    padding: 1.5rem;
    opacity: 0;
}

.team-card:hover .team-info-default {
    opacity: 0;
}

.team-card:hover .team-info-hover {
    opacity: 1;
}

.team-name {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    margin-bottom: 0.3rem;
}

.team-role {
    font-size: 0.6rem;
    color: var(--accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ===== Development Page ===== */
.dev-hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
}

.dev-hero-title {
    font-family: var(--font-brand);
    font-size: clamp(3rem, 10vw, 7rem);
    letter-spacing: 0.15em;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.dev-hero-tagline {
    font-size: 0.85rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
}

.dev-hero-icon {
    width: 120px;
    margin: 2rem auto 0;
}

.dev-hero-icon img {
    width: 100%;
    height: auto;
    filter: brightness(0.9);
}

/* Comparison Section */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

.comparison-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem;
}

.comparison-card.ours {
    border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.3);
}

.comparison-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.comparison-header img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.comparison-label {
    font-family: var(--font-brand);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.comparison-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.comparison-list li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.03em;
}

.status-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.status-icon.included { color: var(--accent); }
.status-icon.not-included { color: #ff5555; }
.status-icon.planned { color: #ffaa33; }

/* Comparison legend */
.comparison-legend {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.6rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

/* Prototype Parts */
.parts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .parts-grid {
        grid-template-columns: 1fr;
    }
}

.part-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.part-card:hover {
    border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.25);
    box-shadow: var(--glow-accent);
    transform: translateY(-4px);
}

.part-img {
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.02);
    display: flex;
    align-items: center;
    justify-content: center;
}

.part-img img {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
}

.part-info {
    padding: 1.5rem;
}

.part-name {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    margin-bottom: 0.4rem;
}

.part-detail {
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 0.03em;
    line-height: 1.7;
}

/* Video Sections */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.video-grid.triple {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 900px) {
    .video-grid,
    .video-grid.triple {
        grid-template-columns: 1fr;
    }
}

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.video-card:hover {
    border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.2);
}

.video-card iframe {
    width: 100%;
    aspect-ratio: 16/9;
    display: block;
    border: none;
}

.video-label {
    padding: 1rem 1.5rem;
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

/* ===== Fade-in Animation ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== Footer ===== */
.site-footer {
    border-top: 1px solid var(--border);
    margin-top: 2rem;
    padding: 3rem 2rem;
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.footer-copyright {
    font-size: 0.6rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.ki-footer-brand {
    text-align: right;
}

.ki-footer-name {
    display: block;
    font-family: var(--font-brand);
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    color: var(--text-dim);
}

.ki-footer-sub {
    display: block;
    font-family: var(--font-brand);
    font-size: 0.5rem;
    letter-spacing: 0.5em;
    color: rgba(136, 136, 153, 0.5);
    margin-top: 0.2rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .section {
        padding: 3rem 1.2rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .ki-footer-brand {
        text-align: center;
    }

    .footer-social {
        justify-content: center;
    }
}