@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&family=Inter:wght@300;400;500&display=swap');

:root {
    --bg-dark: #121212;
    --bg-card: #1e1e1e;
    --gold-primary: #c5a059;
    --gold-secondary: #8e6d31;
    --gold-pale: #f4e4bc;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --white: #ffffff;
    --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4, .font-display {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Layout Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 100px 0;
}

/* Typography Helpers */
.text-gold { color: var(--gold-primary); }
.text-center { text-align: center; }
.section-title {
    font-size: 2.5rem;
    margin-bottom: 50px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gold-primary);
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(18, 18, 18, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(197, 160, 89, 0.2);
    padding: 20px 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gold-primary);
}

.nav-links {
    display: flex;
    gap: 30px;
}

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

.nav-links a.active {
    color: var(--gold-primary);
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 2px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn-gold:hover {
    background: var(--gold-pale);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--gold-primary);
    color: var(--gold-primary);
}

.btn-outline:hover {
    background: var(--gold-primary);
    color: var(--bg-dark);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://tse-mm.bing.com/th?q=威尼斯 建筑 奢华') center/cover no-repeat;
    position: relative;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    color: var(--gold-pale);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1.2s ease;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid rgba(197, 160, 89, 0.1);
    padding: 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--gold-primary);
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 50px;
}

/* Footer */
footer {
    background: #0a0a0a;
    padding: 80px 0 40px;
    border-top: 1px solid rgba(197, 160, 89, 0.2);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h4 {
    color: var(--gold-primary);
    margin-bottom: 25px;
}

.footer-col p, .footer-col li {
    color: var(--text-muted);
    margin-bottom: 12px;
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.5rem; }
    .nav-links { display: none; }
    .section-title { font-size: 2rem; }
}

/* Floating Chat */
.chat-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--gold-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-dark);
    font-size: 1.5rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    z-index: 999;
    cursor: pointer;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: var(--gold-secondary);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--gold-primary);
}