/* ============================================
   NovaAI — 智联万物·数绘地球
   Style: Dark tech / Earth theme / Premium
   ============================================ */

:root {
    --black: #0a0a0a;
    --black-2: #111111;
    --black-3: #1a1a1a;
    --gray-900: #1a1a2e;
    --gray-800: #222233;
    --gray-700: #2a2a3a;
    --gray-600: #444455;
    --gray-500: #666677;
    --gray-400: #888899;
    --gray-300: #aaaabb;
    --gray-200: #ccccdd;
    --gray-100: #e8e8f0;
    --white: #ffffff;

    --accent-blue: #4a6cf7;
    --accent-cyan: #00d4ff;
    --accent-purple: #6366f1;

    --gradient-primary: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    --gradient-cyan: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    --gradient-dark: linear-gradient(180deg, var(--black), var(--black-2));

    --font-display: 'Orbitron', monospace;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --transition: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s var(--transition);
    --transition-medium: 0.5s var(--transition);
    --transition-fast: 0.3s var(--transition);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--gray-700) var(--black);
}

body {
    font-family: var(--font-body);
    background: var(--black);
    color: var(--gray-200);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent-blue);
    color: var(--white);
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--black);
}
::-webkit-scrollbar-thumb {
    background: var(--gray-700);
    border-radius: 3px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Loading Screen */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--black);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s var(--transition), visibility 0.8s var(--transition);
}
#loading-screen.hidden { opacity: 0; visibility: hidden; }

.loader-ring {
    width: 48px; height: 48px;
    border: 2px solid var(--gray-800);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
.loader-text {
    margin-top: 20px;
    font-family: var(--font-display);
    font-size: 12px;
    letter-spacing: 6px;
    color: var(--gray-500);
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Navigation */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-medium);
}
.navbar.scrolled {
    background: rgba(10,10,10,0.85);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px;
    color: var(--white);
    font-family: var(--font-display); font-size: 20px; font-weight: 700; letter-spacing: 2px;
}
.logo-accent { color: var(--accent-cyan); }

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-link {
    font-size: 14px; font-weight: 500; color: var(--gray-400);
    letter-spacing: 1px; transition: color var(--transition-fast);
    position: relative;
}
.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 1px; background: var(--accent-cyan);
    transition: width var(--transition-medium);
}
.nav-link:hover { color: var(--white); }
.nav-link:hover::after { width: 100%; }

.nav-cta {
    padding: 8px 20px; border: 1px solid var(--accent-cyan);
    border-radius: 100px; color: var(--accent-cyan);
    transition: all var(--transition-fast);
}
.nav-cta:hover { background: var(--accent-cyan); color: var(--black) !important; }
.nav-cta::after { display: none; }

.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span {
    display: block; width: 24px; height: 1.5px;
    background: var(--white); transition: all var(--transition-fast);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* Hero */
.hero {
    position: relative; height: 100vh; min-height: 700px;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
#earth-container {
    position: absolute; inset: 0; z-index: 1;
}
.hero-overlay {
    position: absolute; inset: 0; z-index: 2;
    background: radial-gradient(ellipse at center, transparent 30%, var(--black) 100%);
    pointer-events: none;
}
.hero-content {
    position: relative; z-index: 3;
    text-align: center; max-width: 800px; padding: 0 24px;
}
.hero-badge {
    display: inline-block;
    font-family: var(--font-display); font-size: 12px; letter-spacing: 4px;
    color: var(--accent-cyan);
    border: 1px solid rgba(0,212,255,0.2);
    padding: 8px 20px; border-radius: 100px; margin-bottom: 32px;
    background: rgba(0,212,255,0.05);
}
.hero-title {
    font-family: var(--font-display);
    font-size: clamp(36px, 6vw, 72px);
    font-weight: 800; line-height: 1.15;
    color: var(--white); margin-bottom: 24px;
}
.title-line { display: block; }
.title-line.accent {
    background: var(--gradient-cyan);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px); color: var(--gray-400);
    max-width: 560px; margin: 0 auto 40px;
    font-weight: 300; line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
    display: inline-block; padding: 14px 36px; border-radius: 100px;
    font-family: var(--font-display); font-size: 13px; font-weight: 600;
    letter-spacing: 2px; text-transform: uppercase;
    background: var(--gradient-primary); color: var(--white);
    border: none; cursor: pointer;
    transition: all var(--transition-fast);
    position: relative; overflow: hidden;
}
.btn-primary::before {
    content: ''; position: absolute; inset: 0;
    background: var(--gradient-cyan); opacity: 0; transition: opacity var(--transition-fast);
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0,212,255,0.25);
}

.btn-outline {
    display: inline-block; padding: 14px 36px; border-radius: 100px;
    font-family: var(--font-display); font-size: 13px; font-weight: 600;
    letter-spacing: 2px; text-transform: uppercase;
    border: 1px solid var(--gray-600); color: var(--gray-300);
    transition: all var(--transition-fast);
}
.btn-outline:hover { border-color: var(--white); color: var(--white); transform: translateY(-2px); }

.scroll-indicator {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    z-index: 3; display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.scroll-indicator span {
    font-family: var(--font-display); font-size: 10px; letter-spacing: 4px; color: var(--gray-600);
}
.scroll-line {
    width: 1px; height: 40px;
    background: linear-gradient(180deg, var(--gray-600), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%,100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* Sections Common */
.section { position: relative; padding: 120px 0; overflow: hidden; }
.section-header { text-align: center; margin-bottom: 72px; }
.section-header.light .section-desc { color: var(--gray-400); }
.section-label {
    display: inline-block; font-family: var(--font-display);
    font-size: 11px; letter-spacing: 4px; color: var(--accent-cyan); margin-bottom: 16px;
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 4vw, 48px); font-weight: 700;
    color: var(--white); margin-bottom: 16px;
}
.section-desc {
    font-size: 17px; color: var(--gray-500); max-width: 500px; margin: 0 auto;
}

/* Capabilities */
.capabilities { background: var(--black-2); }
.section-bg { position: absolute; inset: 0; pointer-events: none; }
.grid-lines {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 40px 40px;
}

.caps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cap-card {
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg); padding: 40px 32px;
    transition: all var(--transition-medium);
    position: relative; overflow: hidden;
}
.cap-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: var(--gradient-primary); opacity: 0; transition: opacity var(--transition-medium);
}
.cap-card:hover {
    border-color: rgba(74,108,247,0.3); transform: translateY(-8px);
    background: rgba(255,255,255,0.04);
}
.cap-card:hover::before { opacity: 1; }
.cap-icon { color: var(--accent-cyan); margin-bottom: 24px; }
.cap-title {
    font-family: var(--font-display); font-size: 18px; font-weight: 600;
    color: var(--white); margin-bottom: 12px; letter-spacing: 1px;
}
.cap-desc { font-size: 15px; color: var(--gray-500); line-height: 1.7; margin-bottom: 24px; }
.cap-stat {
    display: flex; align-items: baseline; gap: 8px;
    padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.06);
}
.stat-num {
    font-family: var(--font-display); font-size: 28px; font-weight: 700;
    background: var(--gradient-cyan); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label { font-size: 13px; color: var(--gray-500); }

/* Solutions */
.solutions { background: var(--black); }
.solutions-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg); overflow: hidden;
}
.solution-card { background: var(--black); padding: 48px 40px; transition: all var(--transition-medium); position: relative; }
.solution-card:hover { background: var(--black-2); }
.sol-number {
    font-family: var(--font-display); font-size: 40px; font-weight: 800;
    color: rgba(255,255,255,0.04); position: absolute; top: 16px; right: 24px; line-height: 1;
}
.sol-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--accent-cyan); margin-bottom: 20px;
    box-shadow: 0 0 12px rgba(0,212,255,0.4);
}
.sol-title {
    font-family: var(--font-display); font-size: 20px; font-weight: 600;
    color: var(--white); margin-bottom: 12px; letter-spacing: 1px;
}
.sol-desc { font-size: 15px; color: var(--gray-500); line-height: 1.7; max-width: 360px; }

/* Stats */
.stats { background: var(--black-2); }
.stats-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.stats-globe-ring {
    position: absolute; top: 50%; left: 50%;
    width: 600px; height: 600px;
    transform: translate(-50%, -50%);
    border: 1px solid rgba(0,212,255,0.06); border-radius: 50%;
    animation: ringPulse 4s ease-in-out infinite;
}
@keyframes ringPulse {
    0%,100% { transform: translate(-50%,-50%) scale(1); opacity: 0.3; }
    50% { transform: translate(-50%,-50%) scale(1.1); opacity: 0.6; }
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.stat-item { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 16px; }
.stat-ring { position: relative; width: 120px; height: 120px; }
.stat-circle { width: 100%; height: 100%; transform: rotate(-90deg); }
.circle-bg { fill: none; stroke: rgba(255,255,255,0.06); stroke-width: 3; }
.circle-progress { fill: none; stroke: var(--accent-cyan); stroke-width: 3; stroke-linecap: round; }
.stat-value {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
    font-family: var(--font-display); font-size: 28px; font-weight: 700; color: var(--white);
}
.stat-desc { font-size: 14px; color: var(--gray-500); letter-spacing: 1px; }

/* About */
.about { background: var(--black); }
.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-text .section-title { margin-bottom: 24px; }
.about-p { font-size: 16px; color: var(--gray-500); line-height: 1.8; margin-bottom: 20px; }
.about-grid { display: flex; gap: 32px; margin-top: 40px; }
.about-stat-mini { text-align: center; }
.asm-num {
    display: block; font-family: var(--font-display); font-size: 28px; font-weight: 700;
    background: var(--gradient-cyan); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; margin-bottom: 4px;
}
.asm-label { font-size: 12px; color: var(--gray-600); letter-spacing: 1px; }
.about-visual { display: flex; justify-content: center; }
.globe-mini { position: relative; width: 300px; height: 300px; }
.mini-earth {
    position: absolute; top: 50%; left: 50%;
    width: 80px; height: 80px;
    transform: translate(-50%,-50%);
    border-radius: 50%;
    background: radial-gradient(circle at 35% 30%, #00d4ff, #1a3a6a);
    box-shadow: 0 0 40px rgba(0,212,255,0.2), inset -10px -10px 30px rgba(0,0,0,0.5);
    animation: floatEarth 6s ease-in-out infinite;
}
@keyframes floatEarth {
    0%,100% { transform: translate(-50%,-50%) scale(1); }
    50% { transform: translate(-50%,-50%) scale(1.05); }
}
.mini-orbit {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%,-50%);
    border: 1px solid rgba(0,212,255,0.1); border-radius: 50%;
    animation: orbitRotate 20s linear infinite;
}
.mini-orbit { width: 180px; height: 180px; }
.mini-orbit.o2 { width: 240px; height: 240px; animation-duration: 30s; animation-direction: reverse; border-color: rgba(99,102,241,0.08); }
.mini-orbit.o3 { width: 290px; height: 290px; animation-duration: 40s; border-color: rgba(74,108,247,0.06); }
@keyframes orbitRotate { to { transform: translate(-50%,-50%) rotate(360deg); } }

/* CTA */
.cta { background: var(--black-2); }
.cta-particles {
    position: absolute; inset: 0; pointer-events: none;
    background-image:
        radial-gradient(1px 1px at 20% 30%, var(--accent-cyan), transparent),
        radial-gradient(1px 1px at 40% 70%, var(--accent-blue), transparent),
        radial-gradient(1px 1px at 60% 20%, var(--accent-purple), transparent),
        radial-gradient(1px 1px at 80% 50%, var(--accent-cyan), transparent);
    background-size: 200% 200%; opacity: 0.3;
    animation: particleDrift 8s ease-in-out infinite alternate;
}
@keyframes particleDrift {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}
.cta-content { max-width: 600px; margin: 0 auto; text-align: center; }
.cta-title {
    font-family: var(--font-display); font-size: clamp(32px, 4vw, 44px);
    font-weight: 700; color: var(--white); margin-bottom: 16px;
}
.cta-desc { font-size: 16px; color: var(--gray-500); margin-bottom: 40px; line-height: 1.7; }
.cta-form { text-align: left; }
.form-row { margin-bottom: 16px; }
.form-row input, .form-row select, .form-row textarea {
    width: 100%; padding: 14px 20px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-sm);
    color: var(--white); font-family: var(--font-body); font-size: 15px;
    outline: none; transition: border-color var(--transition-fast);
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(74,108,247,0.1);
}
.form-row input::placeholder, .form-row textarea::placeholder { color: var(--gray-600); }
.form-row select {
    color: var(--gray-400); appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 16px center;
}
.form-row textarea { resize: vertical; min-height: 100px; }
.form-row.input-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-submit { width: 100%; padding: 16px; font-size: 14px; margin-top: 8px; }

/* Footer */
.footer { border-top: 1px solid rgba(255,255,255,0.04); padding: 48px 0 32px; }
.footer-top {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 24px; margin-bottom: 32px;
}
.footer-brand {
    display: flex; align-items: center; gap: 10px;
    color: var(--white); font-family: var(--font-display); font-size: 16px; font-weight: 700; letter-spacing: 2px;
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 14px; color: var(--gray-500); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--white); }
.footer-social { display: flex; gap: 16px; }
.footer-social a { color: var(--gray-600); transition: color var(--transition-fast); }
.footer-social a:hover { color: var(--accent-cyan); }
.footer-bottom { padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.04); text-align: center; }
.footer-bottom p { font-size: 13px; color: var(--gray-700); }

/* Reveal Animation */
[data-reveal] {
    opacity: 0; transform: translateY(30px);
    transition: opacity 0.8s var(--transition), transform 0.8s var(--transition);
}
[data-reveal].visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1024px) {
    .caps-grid { grid-template-columns: repeat(2, 1fr); }
    .about-layout { gap: 48px; }
    .stats-grid { gap: 24px; }
}
@media (max-width: 768px) {
    .nav-links {
        position: fixed; top: 0; right: -100%; width: 70%; height: 100vh;
        background: rgba(10,10,10,0.97); backdrop-filter: blur(20px);
        flex-direction: column; justify-content: center; gap: 40px;
        transition: right var(--transition-medium);
    }
    .nav-links.open { right: 0; }
    .nav-toggle { display: flex; }
    .caps-grid, .solutions-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .about-layout { grid-template-columns: 1fr; gap: 40px; }
    .about-grid { justify-content: center; }
    .form-row.input-row-2 { grid-template-columns: 1fr; }
    .section { padding: 80px 0; }
    .hero-title { font-size: 32px; }
    .footer-top { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .stat-ring { width: 100px; height: 100px; }
    .stat-value { font-size: 22px; }
}