/* ===================================
   国医海南官网 - 主样式文件
   创意性 UI 设计与互动体验
   =================================== */

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* 夜间模式 */
body.dark-mode {
    --bg-primary: #0a0a14;
    --bg-secondary: #12121f;
    --bg-tertiary: #1a1a2e;
    --bg-card: rgba(30, 30, 50, 0.8);
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-light: rgba(255, 255, 255, 0.1);
    --border-medium: rgba(255, 255, 255, 0.15);
    --border-dark: rgba(255, 255, 255, 0.2);
}

/* 容器 */
.container {
    max-width: var(--container-2xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

body.dark-mode .platform-card,
body.dark-mode .feature-item,
body.dark-mode .flow-step,
body.dark-mode .research-stat,
body.dark-mode .contact-form-wrapper {
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .platform-card:hover {
    border-color: var(--primary-300);
}

/* ===================================
   加载动画
   =================================== */
.loader {
    position: fixed;
    inset: 0;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loader);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-logo {
    margin-bottom: var(--spacing-xl);
}

.logo-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    position: relative;
}

.dna-helix {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 3px solid var(--primary-500);
    animation: dnaRotate 2s linear infinite;
}

@keyframes dnaRotate {
    from { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.1); }
    to { transform: rotate(360deg) scale(1); }
}

.loader-text {
    color: var(--text-light);
    font-size: var(--text-xl);
    font-weight: var(--font-medium);
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--spacing-lg);
}

.loader-bar {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.loader-progress {
    width: 0;
    height: 100%;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    animation: loading 2s ease-in-out forwards;
}

@keyframes loading {
    0% { width: 0; }
    100% { width: 100%; }
}

/* ===================================
   导航栏
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

/* 夜间模式 */
body.dark-mode .navbar {
    background: rgba(10, 10, 20, 0.9);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .navbar.scrolled {
    background: rgba(10, 10, 20, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.navbar-container {
    max-width: var(--container-2xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-cn {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    letter-spacing: var(--tracking-wide);
}

.logo-en {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-600);
}

.link-indicator {
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.nav-link:hover .link-indicator,
.nav-link.active .link-indicator {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

/* 主题切换按钮 */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    margin-right: var(--spacing-md);
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-500);
    transform: rotate(15deg);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
    stroke: var(--text-primary);
    transition: all var(--transition-base);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

body.dark-mode .theme-toggle {
    border-color: rgba(255, 255, 255, 0.3);
}

body.dark-mode .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

body.dark-mode .theme-toggle svg {
    stroke: var(--text-light);
}

body.dark-mode .sun-icon {
    display: none;
}

body.dark-mode .moon-icon {
    display: block;
}

/* 语言选择器 */
.language-selector {
    position: relative;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 120px;
}

.language-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-500);
}

.current-lang {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

.arrow-icon {
    width: 16px;
    height: 16px;
    stroke: var(--text-secondary);
    transition: transform var(--transition-base);
}

.language-btn.active .arrow-icon {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-option:hover {
    background: var(--bg-secondary);
}

.lang-option:first-child {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.flag {
    font-size: var(--text-lg);
}

.lang-name {
    font-size: var(--text-sm);
    color: var(--text-primary);
    font-weight: var(--font-medium);
}

.lang-option.active .lang-name {
    color: var(--primary-500);
    font-weight: var(--font-bold);
}

/* RTL 支持 (阿拉伯语) */
body.rtl {
    direction: rtl;
}

body.rtl .navbar-actions {
    flex-direction: row-reverse;
}

body.rtl .language-dropdown {
    right: auto;
    left: 0;
}

body.rtl .nav-menu {
    direction: rtl;
}

/* ===================================
   Hero 区域
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--navbar-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

#heroCanvas {
    width: 100%;
    height: 100%;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(10, 10, 15, 0.3) 0%, rgba(10, 10, 15, 0.2) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-lg);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-light);
    font-size: var(--text-sm);
    margin-bottom: var(--spacing-xl);
}

.badge-icon {
    font-size: var(--text-lg);
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.title-line {
    display: block;
    font-size: var(--text-6xl);
    font-weight: var(--font-extrabold);
    color: var(--text-light);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-wide);
}

.title-line:first-child {
    background: linear-gradient(135deg, #fff 0%, var(--primary-300) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-line:last-child {
    background: linear-gradient(135deg, var(--accent-300) 0%, var(--primary-400) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-2xl);
    color: rgba(255, 255, 255, 0.9);
    font-weight: var(--font-light);
    margin-bottom: var(--spacing-2xl);
    letter-spacing: var(--tracking-widest);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: var(--font-semibold);
    font-size: var(--text-base);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-light);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: var(--text-light);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-arrow {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-plus,
.stat-unit {
    font-size: var(--text-3xl);
    color: var(--accent-400);
}

.stat-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    background: linear-gradient(135deg, #ff9500 0%, #ffcc00 50%, #ffaa00 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: var(--text-sm);
    margin-top: var(--spacing-sm);
    font-weight: var(--font-medium);
}

.stat-item:hover .stat-label {
    background: linear-gradient(135deg, #ffaa00 0%, #ffcc00 50%, #ff9500 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--text-xs);
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-full);
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-full);
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.5; transform: translateX(-50%) translateY(10px); }
}

/* ===================================
   通用 Section 样式
   =================================== */
section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    color: var(--text-primary);
    line-height: var(--leading-tight);
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   关于我们
   =================================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.about-lead {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.about-features {
    display: grid;
    gap: var(--spacing-lg);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.feature-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: var(--text-3xl);
    flex-shrink: 0;
}

.feature-content h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.feature-content p {
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

.about-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-container {
    width: 400px;
    height: 400px;
    position: relative;
}

#brainCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
}

.visual-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid var(--primary-200);
    animation: ringPulse 3s ease-in-out infinite;
}

.ring-1 { animation-delay: 0s; }
.ring-2 { animation-delay: 0.5s; }
.ring-3 { animation-delay: 1s; }

@keyframes ringPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.5; }
}

.visual-center {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-icon {
    font-size: var(--text-7xl);
    animation: brainFloat 3s ease-in-out infinite;
}

@keyframes brainFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ===================================
   技术平台
   =================================== */
.platform-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.platform-filter {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.platform-filter:hover,
.platform-filter.active {
    background: var(--gradient-primary);
    color: var(--text-light);
    border-color: transparent;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.platform-card {
    position: relative;
    padding: var(--spacing-2xl);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-300);
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 102, 204, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.platform-card:hover .card-glow {
    opacity: 1;
}

.card-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.icon-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    transform: rotate(45deg);
    transition: transform var(--transition-base);
}

.platform-card:hover .icon-bg {
    transform: rotate(0deg) scale(1.1);
}

.card-icon > span {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-3xl);
    z-index: 1;
}

.card-title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.card-desc {
    color: var(--text-tertiary);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-lg);
}

.card-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    color: var(--text-secondary);
    font-weight: var(--font-medium);
}

/* ===================================
   科研转化
   =================================== */
.research-flow {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
    overflow-x: auto;
    padding: var(--spacing-lg) 0;
}

.flow-step {
    flex: 0 0 280px;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    position: relative;
    transition: all var(--transition-base);
}

.flow-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.3;
    margin-bottom: var(--spacing-md);
}

.flow-step h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.flow-step p {
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

.flow-connector {
    flex-shrink: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-300), var(--accent-300));
    margin-top: 60px;
}

.research-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.research-stat {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-base);
}

.research-stat:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: var(--text-4xl);
    margin-bottom: var(--spacing-md);
}

.stat-value {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

/* ===================================
   联系我们
   =================================== */
.contact {
    background: var(--bg-secondary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
}

.contact-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-2xl);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.item-icon {
    font-size: var(--text-2xl);
    flex-shrink: 0;
}

.item-content {
    flex: 1;
}

.item-label {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.item-value {
    font-size: var(--text-base);
    color: var(--text-primary);
    font-weight: var(--font-medium);
}

.contact-form-wrapper {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: var(--font-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--text-base);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ===================================
   页脚
   =================================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-muted);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
}

.footer-logo-text .logo-cn {
    color: var(--text-light);
}

.footer-logo-text .logo-en {
    color: var(--text-muted);
}

.footer-desc {
    line-height: var(--leading-relaxed);
}

.footer-section h3 {
    color: var(--text-light);
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    margin-bottom: var(--spacing-lg);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent-400);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-xl);
    text-align: center;
}

.footer-bottom p {
    margin-bottom: var(--spacing-sm);
}

.footer-bottom a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--accent-400);
}

/* ===================================
   回到顶部按钮
   =================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-2xl);
    right: var(--spacing-2xl);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--text-light);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-sticky);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

/* ===================================
   在线客服按钮
   =================================== */
.service-btn {
    position: fixed;
    bottom: var(--spacing-2xl);
    left: var(--spacing-2xl);
    width: 50px;
    height: 50px;
    background: var(--accent-500);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.service-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.service-btn:hover {
    background: var(--accent-600);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.service-btn svg {
    width: 24px;
    height: 24px;
}

.service-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger-500);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: var(--font-bold);
}

/* 客服聊天窗口 */
.chat-window {
    position: fixed;
    bottom: calc(var(--spacing-2xl) + 60px);
    left: var(--spacing-2xl);
    width: 380px;
    max-height: 600px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    z-index: calc(var(--z-sticky) + 1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: all var(--transition-base);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-window.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: var(--primary-500);
    color: white;
}

.chat-header h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin: 0;
}

.close-chat {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.close-chat:hover {
    background: rgba(255, 255, 255, 0.2);
}

.close-chat svg {
    width: 20px;
    height: 20px;
}

.chat-messages {
    height: 300px;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    flex: 1;
}

.message {
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    animation: message-slide 0.3s var(--ease-out);
}

@keyframes message-slide {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.bot {
    flex-direction: row;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    flex-shrink: 0;
}

.message.bot .message-avatar {
    background: var(--primary-100);
}

.message.user .message-avatar {
    background: var(--accent-100);
}

.message-content {
    max-width: 75%;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    background: white;
    box-shadow: var(--shadow-sm);
}

.message.user .message-content {
    background: var(--primary-500);
    color: white;
}

.message-text {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    white-space: pre-line;
}

.message-time {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

.message.user .message-time {
    color: rgba(255, 255, 255, 0.8);
}

.keywords-section {
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
    max-height: 150px;
    overflow-y: auto;
}

.keywords-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-xs);
}

.keyword-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--text-xs);
    color: var(--text-primary);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.keyword-btn:hover {
    background: var(--primary-50);
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

.chat-input-area {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
}

.chat-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.send-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-500);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--text-sm);
}

.send-btn:hover {
    background: var(--primary-600);
    transform: translateY(-1px);
}

/* 夜间模式适配 */
body.dark-mode .message-content {
    background: var(--bg-tertiary);
}

body.dark-mode .keyword-btn {
    background: var(--bg-secondary);
}

body.dark-mode .keyword-btn:hover {
    background: rgba(102, 126, 234, 0.2);
}

/* ===================================
   响应式设计优化
   =================================== */
@media (max-width: 1024px) {
    .about-content,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .research-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .geo-rings,
    .geo-morph,
    .geo-atom {
        transform: scale(0.5) !important;
    }
}

@media (max-width: 768px) {
    .navbar {
        height: var(--navbar-height-mobile);
    }
    
    .nav-menu {
        position: fixed;
        top: var(--navbar-height-mobile);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        margin-right: var(--spacing-sm);
    }
    
    .theme-toggle svg {
        width: 20px;
        height: 20px;
    }
    
    .language-selector {
        margin-right: var(--spacing-sm);
    }
    
    .language-btn {
        min-width: 100px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .current-lang {
        font-size: var(--text-xs);
    }
    
    .arrow-icon {
        width: 14px;
        height: 14px;
    }
    
    .language-dropdown {
        right: 0;
        min-width: 140px;
    }
    
    .navbar-actions {
        gap: var(--spacing-sm);
    }
    
    .title-line {
        font-size: var(--text-4xl);
    }
    
    .hero-stats {
        gap: var(--spacing-xl);
    }
    
    .platform-grid {
        grid-template-columns: 1fr;
    }
    
    .research-flow {
        flex-direction: column;
    }
    
    .flow-connector {
        width: 2px;
        height: 40px;
        margin: 0 0 0 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   性能优化类
   =================================== */
.will-change-transform {
    will-change: transform;
}

.will-change-opacity {
    will-change: opacity;
}

.contain-strict {
    contain: strict;
    isolation: isolate;
}

/* 硬件加速 */
.hardware-accel {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* 减少重绘重排 */
.optimize-render {
    transform: translate3d(0, 0, 0);
}

/* ===================================
   动画性能优化
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===================================
   加载性能优化
   =================================== */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lazy-load.loaded {
    opacity: 1;
}

.fade-in-up {
    animation: fadeInUp 0.8s ease forwards;
}

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

/* ===================================
   文字渐变动画
   =================================== */
.gradient-text {
    background: linear-gradient(
        90deg,
        var(--primary-500) 0%,
        var(--accent-500) 50%,
        var(--primary-500) 100%
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* ===================================
   卡片 3D 倾斜效果
   =================================== */
.tilt-card {
    transition: transform 0.3s ease;
    transform-style: preserve-3d;
}

.tilt-card:hover {
    box-shadow: var(--shadow-2xl);
}

/* ===================================
   磁吸按钮
   =================================== */
.magnetic-btn {
    transition: transform 0.3s ease;
    display: inline-block;
}

/* ===================================
   脉冲光晕效果
   =================================== */
.glow-effect {
    position: relative;
}

.glow-effect::before {
    content: '';
    position: absolute;
    inset: -4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    z-index: -1;
    filter: blur(20px);
    opacity: 0.5;
    animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

/* ===================================
   悬浮粒子效果
   =================================== */
.floating-particle {
    position: absolute;
    pointer-events: none;
    animation: float 6s ease-in-out infinite;
}

.floating-particle:nth-child(1) {
    animation-delay: 0s;
}

.floating-particle:nth-child(2) {
    animation-delay: 1s;
}

.floating-particle:nth-child(3) {
    animation-delay: 2s;
}

.floating-particle:nth-child(4) {
    animation-delay: 3s;
}

.floating-particle:nth-child(5) {
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* ===================================
   视差滚动效果
   =================================== */
.parallax-section {
    transform: translateZ(0);
    will-change: transform;
}

/* ===================================
   波纹点击效果
   =================================== */
.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    transform: scale(0);
    animation: rippleEffect 0.6s ease-out;
    pointer-events: none;
}

@keyframes rippleEffect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* ===================================
   打字机效果
   =================================== */
.typewriter {
    overflow: hidden;
    border-right: 2px solid var(--primary-500);
    white-space: nowrap;
    animation: typing 3s steps(40, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

@keyframes blink-caret {
    from, to {
        border-color: transparent;
    }
    50% {
        border-color: var(--primary-500);
    }
}

/* ===================================
   3D 立方体旋转
   =================================== */
.cube-wrapper {
    perspective: 1000px;
}

.cube {
    position: relative;
    width: 100px;
    height: 100px;
    transform-style: preserve-3d;
    animation: cubeRotate 10s linear infinite;
}

.cube-face {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(0, 102, 204, 0.3);
    border: 2px solid var(--primary-500);
}

.cube-face:nth-child(1) {
    transform: rotateY(0deg) translateZ(50px);
}

.cube-face:nth-child(2) {
    transform: rotateY(90deg) translateZ(50px);
}

.cube-face:nth-child(3) {
    transform: rotateY(180deg) translateZ(50px);
}

.cube-face:nth-child(4) {
    transform: rotateY(-90deg) translateZ(50px);
}

.cube-face:nth-child(5) {
    transform: rotateX(90deg) translateZ(50px);
}

.cube-face:nth-child(6) {
    transform: rotateX(-90deg) translateZ(50px);
}

@keyframes cubeRotate {
    from {
        transform: rotateX(0deg) rotateY(0deg);
    }
    to {
        transform: rotateX(360deg) rotateY(360deg);
    }
}

/* ===================================
   响应式优化
   =================================== */
@media (max-width: 768px) {
    .tilt-card {
        transform: none !important;
    }
    
    .magnetic-btn {
        transform: none !important;
    }
    
    .typewriter {
        white-space: normal;
        border-right: none;
        animation: none;
    }
}