/* ChinaGate Master Stylesheet - 2026 Edition
   Theme: High-End Data Broker (Dark Mode)
   Optimization: No Google Fonts, GPU Animations
*/

:root {
    /* Colors: Deep Navy & Electric Copper/Teal */
    --bg-deep: #020c1b;
    --bg-card: #112240;
    --text-main: #a8b2d1;
    --text-bright: #e6f1ff;
    --accent: #64ffda; /* Cyber Green for Data feel */
    --glass: rgba(2, 12, 27, 0.85);
    --shadow: 0 10px 30px -10px rgba(2,12,27,0.7);
}

/* Base Settings */
html { scroll-behavior: smooth; }
body {
    margin: 0; padding: 0;
    background: var(--bg-deep);
    color: var(--text-main);
    /* System Fonts Stack - Safe for China & Fast */
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: all 0.25s cubic-bezier(0.645,0.045,0.355,1); }
ul { list-style: none; padding: 0; margin: 0; }

/* Typography */
h1, h2, h3 { color: var(--text-bright); font-weight: 700; letter-spacing: -0.5px; margin-top: 0; }
.mono { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: 13px; color: var(--accent); }

/* Header & Nav */
header {
    position: sticky; top: 0; z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(100,255,218,0.1);
    height: 80px; display: flex; align-items: center;
}
.navbar { width: 100%; max-width: 1200px; margin: auto; padding: 0 25px; display: flex; justify-content: space-between; align-items: center; }

/* SVG Logo */
.logo-container { display: flex; align-items: center; gap: 12px; }
.logo-svg { width: 40px; height: 40px; }
.logo-text { font-size: 22px; font-weight: 800; color: var(--text-bright); letter-spacing: 0.5px; }
.logo-text span { color: var(--accent); }

/* Navigation */
.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a { font-size: 14px; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* Language Switcher Button */
.lang-btn {
    border: 1px solid var(--accent); color: var(--accent);
    padding: 6px 16px; border-radius: 4px; font-size: 13px;
    font-family: "SFMono-Regular", monospace;
    transition: 0.3s;
}
.lang-btn:hover { background: rgba(100,255,218,0.1); }

/* Hero Section (Animated Gradient) */
.hero {
    height: 90vh; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center;
    background: radial-gradient(circle at 50% 50%, #172a45 0%, #020c1b 100%);
    position: relative; padding: 0 20px;
}
.hero::before {
    /* Grid Pattern for "Data" feel */
    content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: linear-gradient(rgba(100,255,218,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(100,255,218,0.03) 1px, transparent 1px);
    background-size: 40px 40px; pointer-events: none;
}
.hero h1 { font-size: clamp(40px, 8vw, 70px); margin-bottom: 20px; text-shadow: 0 10px 30px rgba(2,12,27,0.5); animation: fadeUp 1s ease-out; }
.hero p { font-size: 18px; max-width: 600px; margin-bottom: 40px; animation: fadeUp 1.2s ease-out 0.2s backwards; }

/* CTA Button */
.btn-main {
    background: transparent; color: var(--accent);
    border: 1px solid var(--accent); padding: 18px 40px;
    font-size: 16px; border-radius: 4px; cursor: pointer;
    font-family: "SFMono-Regular", monospace;
    transition: 0.3s; position: relative; overflow: hidden;
}
.btn-main:hover { background: rgba(100,255,218,0.1); box-shadow: 0 0 20px rgba(100,255,218,0.2); }

/* Services Grid */
.section { padding: 100px 0; }
.container { max-width: 1100px; margin: auto; padding: 0 25px; }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; }
.service-card {
    background: var(--bg-card); padding: 40px 30px; border-radius: 4px;
    transition: transform 0.3s ease, border-color 0.3s ease;
    border: 1px solid transparent; box-shadow: var(--shadow);
}
.service-card:hover { transform: translateY(-7px); border-color: var(--accent); }
.service-icon { width: 50px; height: 50px; stroke: var(--accent); margin-bottom: 20px; stroke-width: 1.5; }

/* Contact Forms */
.contact-wrapper { display: grid; grid-template-columns: 1fr 1.5fr; gap: 50px; margin-top: 40px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; color: var(--text-bright); font-size: 14px; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 12px; background: #0a192f; border: 1px solid #233554;
    color: var(--text-bright); border-radius: 4px; box-sizing: border-box;
    font-family: inherit; transition: 0.3s;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); outline: none; }

/* WeChat Modal */
.modal { display: none; position: fixed; inset: 0; background: rgba(2,12,27,0.9); backdrop-filter: blur(5px); justify-content: center; align-items: center; z-index: 2000; }
.modal-content { background: var(--bg-card); padding: 30px; border-radius: 8px; text-align: center; border: 1px solid var(--accent); position: relative; animation: fadeUp 0.3s; }
.close-btn { position: absolute; top: 10px; right: 15px; color: #fff; cursor: pointer; font-size: 20px; }

/* Footer */
footer { padding: 40px 0; text-align: center; font-size: 14px; color: #8892b0; border-top: 1px solid #233554; }

/* Animations */
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes draw { to { stroke-dashoffset: 0; } }

/* Mobile */
@media(max-width: 768px) {
    .navbar { flex-direction: column; height: auto; padding: 20px; }
    .nav-links { flex-wrap: wrap; justify-content: center; gap: 15px; margin-top: 15px; }
    .contact-wrapper { grid-template-columns: 1fr; }
    .hero h1 { font-size: 40px; }
}