/* 
  KY Kaiyuan Group Global Styles 
  Theme: Light Black & Gold
*/

:root {
    --primary-gold: #D4AF37;
    --dark-gold: #AA8A2E;
    --light-gold: #F1D279;
    --bg-dark: #121212;
    --bg-light: #F5F5F5;
    --text-dark: #1A1A1A;
    --text-light: #FBFBFB;
    --accent-gray: #2C2C2C;
    --transition-smooth: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, .brand-font {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-gold);
    border-radius: 4px;
}

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

header {
    height: 80px;
    background: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--primary-gold);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 24px;
    color: var(--primary-gold);
    text-decoration: none;
    letter-spacing: 2px;
}

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

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gold);
    transition: var(--transition-smooth);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://tse-mm.bing.com/th?q=KY集团总部大楼') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    padding-top: 80px;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    color: var(--primary-gold);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero-content p {
    font-size: 1.5rem;
    max-width: 800px;
    margin: 0 auto 40px;
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 15px 35px;
    background: var(--primary-gold);
    color: var(--bg-dark);
    text-decoration: none;
    font-weight: 700;
    border-radius: 4px;
    transition: var(--transition-smooth);
    border: 2px solid var(--primary-gold);
}

.btn:hover {
    background: transparent;
    color: var(--primary-gold);
    transform: translateY(-3px);
}

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

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

/* Sections */
section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    width: 60px;
    height: 3px;
    background: var(--primary-gold);
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

/* Dark Section */
.section-dark {
    background: var(--bg-dark);
    color: var(--text-light);
}

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

.card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: var(--transition-smooth);
}

.card:hover {
    transform: translateY(-10px);
}

.card-img {
    height: 200px;
    width: 100%;
    object-fit: cover;
}

.card-body {
    padding: 25px;
}

/* Footer */
footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 80px 0 40px;
    border-top: 5px solid var(--primary-gold);
}

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

.footer-logo {
    font-size: 24px;
    color: var(--primary-gold);
    margin-bottom: 20px;
    display: block;
}

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

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-smooth);
}

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

/* Specific UI Elements for Homepage */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
    gap: 20px;
}

.stat-item h3 {
    font-size: 48px;
    color: var(--primary-gold);
    margin-bottom: 10px;
}

.news-item {
    padding-bottom: 20px;
    border-bottom: 1px solid #ddd;
    margin-bottom: 20px;
}

.news-date {
    color: var(--primary-gold);
    font-size: 14px;
    font-weight: bold;
}

/* Products Filter Page */
.filter-sidebar {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.filter-group {
    margin-bottom: 20px;
}

.filter-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

select, input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.online-status {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-dot {
    width: 10px;
    height: 10px;
    background: #4caf50;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(76, 175, 80, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }
}