@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Rajdhani:wght@300;400;500;600;700&display=swap');

:root {
    --color-white: #ffffff;
    --color-light-bg: #f0f9f8;
    --color-light-bg-alt: #e8f4f8;
    --color-card-bg: #ffffff;
    --color-card-border: #d5eae8;
    
    --color-primary-blue: #1a73e8;
    --color-primary-blue-dark: #0d47a1;
    --color-primary-blue-light: #e3f2fd;
    --color-primary-blue-glow: rgba(26, 115, 232, 0.12);
    
    --color-green: #00b894;
    --color-green-dark: #008060;
    --color-green-light: #e6f9f5;
    --color-green-glow: rgba(0, 184, 148, 0.12);
    
    --color-text-primary: #1a1a2e;
    --color-text-secondary: #4a4a6a;
    --color-text-muted: #8888a0;
    --color-text-light: #ffffff;
    
    --color-accent-green: #00c9a7;
    --color-accent-blue: #2196f3;
    
    --color-gradient-blue-green: linear-gradient(135deg, #1a73e8, #00b894);
    --color-gradient-blue: linear-gradient(135deg, #1a73e8, #0d47a1);
    --color-gradient-green: linear-gradient(135deg, #00b894, #008060);
    
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.4s ease;
    --transition-slow: 0.6s ease;
    
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.1);
    --shadow-glow-blue: 0 0 20px rgba(26, 115, 232, 0.2);
    --shadow-glow-green: 0 0 20px rgba(0, 184, 148, 0.2);
    --shadow-header: 0 2px 20px rgba(0, 0, 0, 0.06);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-light-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary-blue);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-green);
}

@layer textures {
    .texture-stainless {
        background-image: 
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(26, 115, 232, 0.03) 2px,
                rgba(26, 115, 232, 0.03) 4px
            );
    }
    
    .texture-grid {
        background-image: 
            linear-gradient(rgba(26, 115, 232, 0.04) 1px, transparent 1px),
            linear-gradient(90deg, rgba(26, 115, 232, 0.04) 1px, transparent 1px);
        background-size: 40px 40px;
    }
    
    .texture-aluminum {
        background-image: 
            repeating-linear-gradient(
                135deg,
                rgba(0, 184, 148, 0.04),
                rgba(0, 184, 148, 0.04) 1px,
                transparent 1px,
                transparent 4px
            );
    }
    
    .texture-mesh {
        background-image: 
            radial-gradient(circle, rgba(26, 115, 232, 0.08) 1px, transparent 1px);
        background-size: 8px 8px;
    }
}

@layer animations {
    @keyframes scan-line {
        0% { transform: translateY(-100%); }
        100% { transform: translateY(100%); }
    }
    
    @keyframes pulse-glow {
        0%, 100% { opacity: 0.6; }
        50% { opacity: 1; }
    }
    
    @keyframes flow {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }
    
    @keyframes float {
        0%, 100% { transform: translateY(0); }
        50% { transform: translateY(-10px); }
    }
    
    @keyframes border-flow {
        0% { background-position: 0% 50%; }
        100% { background-position: 200% 50%; }
    }
    
    @keyframes typewriter {
        from { width: 0; }
        to { width: 100%; }
    }
    
    @keyframes blink {
        0%, 100% { opacity: 1; }
        50% { opacity: 0; }
    }
    
    @keyframes slide-up {
        from { 
            opacity: 0; 
            transform: translateY(30px); 
        }
        to { 
            opacity: 1; 
            transform: translateY(0); 
        }
    }
    
    @keyframes scale-in {
        from { 
            opacity: 0; 
            transform: scale(0.95); 
        }
        to { 
            opacity: 1; 
            transform: scale(1); 
        }
    }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-white);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.8s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-logo {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-primary-blue);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 20px;
    position: relative;
}

.loading-logo::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-gradient-blue-green);
    animation: typewriter 2s ease forwards;
}

.loading-bar {
    width: 200px;
    height: 3px;
    background: var(--color-light-bg);
    overflow: hidden;
    border-radius: 2px;
}

.loading-bar-fill {
    height: 100%;
    background: var(--color-gradient-blue-green);
    animation: flow 1.5s ease infinite;
    background-size: 200% 100%;
    border-radius: 2px;
}


header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(26, 115, 232, 0.1);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-header);
    border-bottom: 1px solid rgba(26, 115, 232, 0.15);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--color-gradient-blue-green);
    display: flex;
    align-items: center;
    justify-content: center;
    clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.logo-icon::after {
    content: 'S';
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 900;
    color: var(--color-white);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.logo-text span {
    color: var(--color-primary-blue);
}

nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    position: relative;
    transition: color var(--transition-fast);
}

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

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

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

.nav-cta {
    display: flex;
    gap: 15px;
}

/* ===== 语言切换器（桌面端） ===== */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 3px;
    background: var(--color-light-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 20px;
}

.lang-switcher-btn {
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1;
    padding: 5px 10px;
    border-radius: 16px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-switcher-btn:hover {
    color: var(--color-primary-blue);
}

.lang-switcher-btn.active {
    background: var(--color-gradient-blue-green);
    color: var(--color-white);
    box-shadow: var(--shadow-glow-blue);
}

/* ===== 语言切换器（移动端，位于折叠菜单内） ===== */
.mobile-lang-switcher {
    display: none; /* 桌面端隐藏，仅移动端折叠菜单内显示 */
    padding: 15px 20px;
    border-top: 1px solid rgba(26, 115, 232, 0.1);
}

.mobile-lang-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 10px;
}

/* ===== 移动端折叠菜单内的 CTA（桌面端隐藏） ===== */
.mobile-nav-cta {
    display: none;
    padding: 15px 20px;
    border-top: 1px solid rgba(26, 115, 232, 0.1);
    gap: 12px;
}

.mobile-lang-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.mobile-lang-options a {
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1;
    padding: 8px 16px;
    border-radius: 16px;
    background: var(--color-light-bg);
    border: 1px solid var(--color-card-border);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.mobile-lang-options a::after {
    display: none;
}

.mobile-lang-options a:hover {
    color: var(--color-primary-blue);
    border-color: var(--color-primary-blue);
}

.mobile-lang-options a.active {
    background: var(--color-gradient-blue-green);
    color: var(--color-white);
    border-color: transparent;
    box-shadow: var(--shadow-glow-blue);
}

.btn {
    padding: 10px 25px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 6px;
}

.btn-primary {
    background: var(--color-primary-blue);
    color: var(--color-white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-blue);
    background: var(--color-primary-blue-dark);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--color-primary-blue);
    color: var(--color-primary-blue);
}

.btn-secondary:hover {
    background: var(--color-primary-blue);
    color: var(--color-white);
    box-shadow: var(--shadow-glow-blue);
}

.btn-accent {
    background: var(--color-green);
    color: var(--color-white);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-green);
    background: var(--color-green-dark);
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.burger-menu span {
    width: 25px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: 
        url('images/主KV.jpg') center center / cover no-repeat;
}

/* 极浅遮罩：保留主 KV 的明亮质感，仅轻微加深保证白字可读 */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background: linear-gradient(
        180deg,
        rgba(10, 25, 55, 0.06) 0%,
        rgba(10, 25, 55, 0.1) 50%,
        rgba(10, 25, 55, 0.16) 100%
    );
    pointer-events: none;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
    animation: scan-line 4s linear infinite;
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
    animation: pulse-glow 3s ease-in-out infinite;
}

.hero-geometric {
    position: absolute;
    width: 100%;
    height: 100%;
}

.hero-geometric::before {
    content: '';
    position: absolute;
    top: 10%;
    right: 5%;
    width: 300px;
    height: 300px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    animation: float 6s ease-in-out infinite;
}

.hero-geometric::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 8%;
    width: 200px;
    height: 200px;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.08), transparent);
    clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 1200px;
    padding: 0 40px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 25px;
    background: rgba(10, 25, 55, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: var(--color-white);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 30px;
    animation: slide-up 0.8s ease forwards;
    opacity: 0;
    border-radius: 4px;
    text-shadow: 0 1px 4px rgba(10, 25, 55, 0.6);
    backdrop-filter: blur(2px);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-white);
    letter-spacing: 0.05em;
    line-height: 1.2;
    margin-bottom: 20px;
    animation: slide-up 0.8s ease 0.2s forwards;
    opacity: 0;
    text-shadow: 0 2px 6px rgba(10, 25, 55, 0.75), 0 6px 22px rgba(10, 25, 55, 0.55);
}

.hero-title span {
    color: rgba(255, 255, 255, 0.95);
    font-weight: 700;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: 1.3rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.95);
    max-width: 600px;
    margin: 0 auto 40px;
    animation: slide-up 0.8s ease 0.4s forwards;
    opacity: 0;
    text-shadow: 0 1px 5px rgba(10, 25, 55, 0.8), 0 4px 14px rgba(10, 25, 55, 0.5);
}

.hero-info {
    display: flex;
    justify-content: center;
    gap: 50px;
    margin-bottom: 50px;
    animation: slide-up 0.8s ease 0.6s forwards;
    opacity: 0;
}

.hero-stat-item {
    text-align: center;
}

.hero-stat-value {
    font-family: var(--font-display);
    font-size: 3.2rem;
    font-weight: 900;
    color: var(--color-white);
    line-height: 1.1;
    text-shadow: 0 2px 6px rgba(10, 25, 55, 0.7), 0 6px 20px rgba(10, 25, 55, 0.5);
}

.hero-stat-label {
    font-family: var(--font-body);
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.95);
    margin-top: 8px;
    letter-spacing: 0.15em;
    font-weight: 600;
    text-shadow: 0 1px 5px rgba(10, 25, 55, 0.75);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    animation: slide-up 0.8s ease 0.8s forwards;
    opacity: 0;
}

.hero-actions .btn-primary {
    background: var(--color-white);
    color: var(--color-primary-blue);
}

.hero-actions .btn-primary:hover {
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.hero-actions .btn-secondary {
    border: 2px solid var(--color-white);
    color: var(--color-white);
}

.hero-actions .btn-secondary:hover {
    background: var(--color-white);
    color: var(--color-primary-blue);
}

.section {
    padding: 100px 40px;
    position: relative;
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary-blue), transparent);
}

.section-dark {
    background: var(--color-white);
}

.section-gray {
    background: var(--color-light-bg);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-green);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

.section-title span {
    color: var(--color-primary-blue);
}

.section-description {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto;
}

.highlight-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    max-width: 1400px;
    margin: 0 auto;
}

.highlight-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    padding: 35px;
    position: relative;
    transition: all var(--transition-normal);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
}

.highlight-card:hover {
    border-color: var(--color-primary-blue);
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.06), transparent);
    clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.highlight-icon {
    font-size: 2.5rem;
    color: var(--color-primary-blue);
    margin-bottom: 20px;
}

.highlight-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.highlight-description {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.schedule-section {
    max-width: 1400px;
    margin: 0 auto;
}

.schedule-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
}

.schedule-tab {
    padding: 12px 30px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    background: var(--color-white);
    border: 1px solid var(--color-card-border);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: 8px;
}

.schedule-tab.active {
    background: var(--color-primary-blue);
    color: var(--color-white);
    border-color: var(--color-primary-blue);
}

.schedule-tab:hover:not(.active) {
    border-color: var(--color-primary-blue);
    color: var(--color-primary-blue);
}

.schedule-container {
    display: none;
}

.schedule-container.active {
    display: block;
    animation: scale-in 0.4s ease;
}

.schedule-day-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 30px;
    padding-left: 20px;
    border-left: 3px solid var(--color-primary-blue);
}

.schedule-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.schedule-item {
    display: flex;
    gap: 30px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    padding: 25px;
    transition: all var(--transition-fast);
    border-radius: 10px;
    box-shadow: var(--shadow-card);
}

.schedule-item:hover {
    border-color: var(--color-primary-blue);
    box-shadow: var(--shadow-card-hover);
}

.schedule-time {
    min-width: 120px;
    padding-right: 20px;
    border-right: 1px solid var(--color-card-border);
}

.schedule-time-value {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary-blue);
}

.schedule-time-period {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.schedule-content {
    flex: 1;
}

.schedule-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.schedule-speaker {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-green);
    margin-bottom: 5px;
}

.schedule-location {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.schedule-category {
    display: inline-block;
    padding: 3px 12px;
    background: var(--color-green-light);
    color: var(--color-green-dark);
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: 10px;
    border-radius: 4px;
}

.forum-section {
    max-width: 1400px;
    margin: 0 auto;
}

.forum-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.forum-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-card);
}

.forum-card:hover {
    border-color: var(--color-primary-blue);
    transform: translateY(-8px);
    box-shadow: var(--shadow-card-hover);
}

.forum-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-gradient-blue-green);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.forum-card:hover::before {
    transform: scaleX(1);
}

.forum-image {
    height: 180px;
    background: url('images/主KV.jpg') center center / cover no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.forum-image-text {
    position: relative;
    z-index: 1;
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 0.15em;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

.forum-info {
    padding: 25px;
}

.forum-date {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-green);
    font-weight: 600;
    margin-bottom: 10px;
}

.forum-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 10px;
}

.forum-desc {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 15px;
}

.forum-speakers {
    display: flex;
    align-items: center;
    gap: 10px;
}

.forum-speaker-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: var(--color-gradient-blue-green);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-white);
}

.brands-section {
    max-width: 1400px;
    margin: 0 auto;
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.brand-item {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all var(--transition-normal);
    border-radius: 10px;
    box-shadow: var(--shadow-card);
}

.brand-item:hover {
    border-color: var(--color-primary-blue);
    background: var(--color-primary-blue-light);
    transform: scale(1.05);
    box-shadow: var(--shadow-card-hover);
}

.brand-logo {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.08), rgba(0, 184, 148, 0.08));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary-blue);
    border-radius: 8px;
}

.brand-name {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
}

.news-section {
    max-width: 1400px;
    margin: 0 auto;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-card);
}

.news-card:hover {
    border-color: var(--color-primary-blue);
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.news-image {
    height: 200px;
    background: url('images/主KV.jpg') center center / cover no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-image-text {
    position: relative;
    z-index: 1;
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 0.15em;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

.news-content {
    padding: 25px;
}

.news-date {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-green);
    margin-bottom: 10px;
}

.news-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-excerpt {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 15px;
    line-height: 1.6;
}

.news-readmore {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-blue);
    text-decoration: none;
    position: relative;
}

.news-readmore::after {
    content: '→';
    margin-left: 5px;
    transition: margin-left var(--transition-fast);
}

.news-readmore:hover::after {
    margin-left: 10px;
}

.guide-section {
    max-width: 1400px;
    margin: 0 auto;
}

.guide-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.guide-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    padding: 40px;
    display: flex;
    gap: 30px;
    transition: all var(--transition-normal);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
}

.guide-card:hover {
    border-color: var(--color-primary-blue);
    background: var(--color-primary-blue-light);
    box-shadow: var(--shadow-card-hover);
}

.guide-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.08), rgba(0, 184, 148, 0.08));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--color-primary-blue);
    flex-shrink: 0;
    border-radius: 12px;
}

.guide-content h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 10px;
}

.guide-content p {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 15px;
}

.guide-content a {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-blue);
    text-decoration: none;
}

footer {
    background: #1a1a2e;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 80px 40px 40px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-brand .logo {
    margin-bottom: 10px;
}

.footer-brand .logo-text {
    color: var(--color-white);
}

.footer-brand .logo-text span {
    color: var(--color-green);
}

.footer-brand p {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: #8a8aaa;
    line-height: 1.6;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: #b0b0c8;
}

.footer-contact-item i {
    color: var(--color-green);
    width: 20px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 15px;
    letter-spacing: 0.1em;
}

.footer-links a {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: #8a8aaa;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-green);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: #6a6a8a;
}

.footer-partners {
    display: flex;
    gap: 20px;
}

.footer-partners span {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: #8a8aaa;
    padding: 5px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}

.footer-organizers {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 30px;
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.organizer-group h4 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-green);
    margin-bottom: 12px;
    letter-spacing: 0.08em;
}

.organizer-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.organizer-list span {
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: #8a8aaa;
    padding: 5px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.organizer-list span:hover {
    border-color: rgba(0, 184, 148, 0.3);
    color: var(--color-green);
}

.form-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    padding: 50px;
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    position: relative;
}

.form-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-gradient-blue-green);
    border-radius: 12px 12px 0 0;
}

.form-header {
    text-align: center;
    margin-bottom: 40px;
}

.form-header h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: 10px;
}

.form-header p {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--color-light-bg);
    border: 1px solid var(--color-card-border);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-fast);
    outline: none;
    border-radius: 8px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary-blue);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-section {
    margin-bottom: 35px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--color-card-border);
}

.form-section:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.form-section-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 20px;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-section-title i {
    color: var(--color-primary-blue);
    font-size: 1rem;
}

.form-check-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.form-check-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 10px 18px;
    background: var(--color-light-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 6px;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.form-check-label:hover {
    border-color: var(--color-primary-blue);
    background: var(--color-primary-blue-light);
}

.form-check-input:checked + span {
    color: var(--color-primary-blue);
    font-weight: 600;
}

.form-check-label:has(.form-check-input:checked) {
    border-color: var(--color-primary-blue);
    background: var(--color-primary-blue-light);
}

.form-submit {
    margin-top: 30px;
}

.form-submit button {
    width: 100%;
    padding: 18px;
    font-size: 1rem;
    border-radius: 8px;
}

@media (max-width: 1200px) {
    .highlight-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .brands-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .forum-grid,
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(26, 115, 232, 0.1);
        box-shadow: var(--shadow-header);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links.active .mobile-lang-switcher {
        display: block;
    }
    
    /* 移动端隐藏桌面导航按钮，改用折叠菜单内的 CTA 与语言切换 */
    .lang-switcher,
    .nav-cta {
        display: none;
    }
    
    .nav-links.active .mobile-nav-cta {
        display: flex;
        flex-wrap: wrap;
    }
    
    .mobile-nav-cta a {
        padding: 10px 22px;
        border-bottom: none;
    }
    
    .mobile-nav-cta a::after {
        display: none;
    }
    
    .nav-links a {
        padding: 14px 20px;
        border-bottom: 1px solid rgba(26, 115, 232, 0.06);
    }
    
    .burger-menu {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-info {
        gap: 30px;
    }
    
    .footer-top {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .guide-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 0 20px;
    }
    
    .section {
        padding: 60px 20px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-info {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .highlight-cards {
        grid-template-columns: 1fr;
    }
    
    .brands-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .forum-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .form-container {
        padding: 30px 20px;
    }
    
    .schedule-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .schedule-time {
        border-right: none;
        border-bottom: 1px solid var(--color-card-border);
        padding-right: 0;
        padding-bottom: 15px;
    }
}

/* ===== 资讯 / 观展指南 / 商务合作 内容页 ===== */
.content-wrap {
    max-width: 1000px;
    margin: 0 auto;
}

.content-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    padding: 36px;
    box-shadow: var(--shadow-card);
    margin-bottom: 28px;
}

.content-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 18px;
    padding-left: 14px;
    border-left: 4px solid var(--color-primary-blue);
}

.content-card p {
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: 12px;
}

.news-detail-date {
    color: var(--color-accent-blue);
    font-weight: 600;
    margin-bottom: 10px;
}

.news-detail-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.info-item {
    background: var(--color-light-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: 22px;
    transition: box-shadow var(--transition-fast);
}

.info-item:hover {
    box-shadow: var(--shadow-glow-blue);
}

.info-item h4 {
    color: var(--color-primary-blue);
    margin-bottom: 10px;
    font-size: 1.05rem;
    font-weight: 700;
}

.info-item p {
    margin-bottom: 0;
}

.download-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px;
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    margin-bottom: 14px;
    background: var(--color-white);
    flex-wrap: wrap;
}

.download-item:hover {
    border-color: var(--color-primary-blue);
    box-shadow: var(--shadow-glow-blue);
}

.download-item h4 {
    color: var(--color-text-primary);
    font-size: 1rem;
    margin-bottom: 4px;
}

.download-item .file-meta {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.faq-item {
    margin-bottom: 20px;
    padding: 18px 20px;
    background: var(--color-light-bg);
    border-radius: 12px;
    border: 1px solid var(--color-card-border);
}

.faq-item h4 {
    color: var(--color-primary-blue);
    margin-bottom: 8px;
    font-size: 1rem;
    font-weight: 700;
}

.faq-item p {
    margin-bottom: 0;
}

.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }

/* ===== 嘉宾页 ===== */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 8px;
}
.speaker-card {
    background: var(--color-white);
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    padding: 28px 24px;
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.speaker-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow-blue);
}
.speaker-avatar {
    width: 76px;
    height: 76px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--color-gradient-blue-green);
    color: var(--color-white);
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow-blue);
}
.speaker-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 6px;
}
.speaker-title {
    color: var(--color-primary-blue);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 10px;
}
.speaker-bio {
    color: var(--color-text-secondary);
    font-size: 0.88rem;
    line-height: 1.7;
    margin-bottom: 0;
}