/* Core Setup & Variables */
:root {
    --primary-color: #6366f1; /* Indigo */
    --secondary-color: #ec4899; /* Pink */
    --accent-color: #8b5cf6; /* Violet */
    --bg-dark: #0f172a;
    --text-light: #f8fafc;
    --text-gray: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--text-light);
    background-color: var(--bg-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

/* Logo Styles */
.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
}

.logo-symbol {
    position: relative;
    width: 40px;
    height: 40px;
    background-color: #f97316; /* Orange */
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-family: sans-serif; /* Ensure Z looks clean */
    font-size: 1.4rem;
    box-shadow: 0 4px 10px rgba(249, 115, 22, 0.3);
}

/* Semi-ring effect */
.logo-symbol::after {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border-radius: 50%;
    border: 2px solid #f97316;
    border-bottom-color: transparent;
    border-left-color: transparent;
    transform: rotate(-45deg);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-gray);
}

.nav-links a:hover, .nav-links a.active {
    color: white;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    background: url('images/hero_banner.png') no-repeat center center/cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.7) 50%, rgba(15, 23, 42, 0.2) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 600px;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.hero h1 span {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
}

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

/* Section Common */
.section {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-title p {
    color: var(--text-gray);
    font-size: 1.1rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 20px;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.icon-box {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, rgba(99, 102, 241, 0.2) 100%);
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* Categories */
.bg-light {
    background: #1e293b;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.category-card {
    background: var(--bg-dark);
    padding: 2.5rem 1rem;
    border-radius: 15px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
}

.category-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.category-card i {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    display: inline-block;
    transition: var(--transition);
}

.category-card:hover i {
    transform: scale(1.1);
}

.category-card h3 {
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.category-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* CTA Section */
.cta-section {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(to bottom, var(--bg-dark), #1e293b);
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.cta-section p {
    color: var(--text-gray);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-large {
    display: inline-block;
    background: white;
    color: var(--bg-dark);
    font-size: 1.1rem;
    font-weight: 700;
    padding: 1rem 3rem;
    border-radius: 50px;
    transition: var(--transition);
}

.btn-large:hover {
    transform: scale(1.05);
    background: #f1f5f9;
}

/* Footer */
footer {
    background: #0b1120;
    padding-top: 4rem;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    padding-bottom: 4rem;
}

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
}

.footer-info p {
    color: var(--text-gray);
    line-height: 1.6;
    max-width: 300px;
}

.footer-links h4, .footer-contact h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-links ul li {
    margin-bottom: 0.8rem;
}

.footer-links ul li a {
    color: var(--text-gray);
}

.footer-links ul li a:hover {
    color: var(--primary-color);
}

.footer-contact p {
    color: var(--text-gray);
    margin-bottom: 0.8rem;
}

.footer-bottom {
    background: #020617;
    padding: 1.5rem 0;
    text-align: center;
}

.footer-bottom p {
    color: #64748b;
    font-size: 0.9rem;
    margin: 0.3rem 0;
}

.beian-info a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s;
}

.beian-info a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}