/**
 * 多维国际教育 - 主样式文件
 * Main Stylesheet
 */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    line-height: var(--line-height-normal);
    color: var(--text-dark);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body[lang="en"] {
    font-family: var(--font-family-en);
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

/* ========== 滚动进度条 Progress Bar ========== */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 4px;
    background: var(--primary-color);
    z-index: var(--z-index-progress);
    transition: width 0.1s;
}

/* ========== 导航栏 Navigation ========== */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-index-sticky);
    transition: all var(--transition-base);
}

nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 30px rgba(0,0,0,0.15);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
}

.logo-image {
    width: auto;
    height: 50px;
}

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

.nav-links > li {
    position: relative;
}

.nav-links a {
    color: var(--text-dark);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-base);
    position: relative;
    padding: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

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

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

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-arrow {
    font-size: 0.7em;
    transition: transform var(--transition-base);
}

.dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-md);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: var(--z-index-dropdown);
    padding: var(--spacing-sm) 0;
    margin-top: var(--spacing-xs);
    list-style: none;
}

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

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    padding: var(--spacing-sm) var(--spacing-md);
    display: block;
    color: var(--text-dark);
    transition: all var(--transition-base);
}

.dropdown-menu a::after {
    display: none;
}

.dropdown-menu a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
    padding-left: var(--spacing-lg);
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-left: var(--spacing-lg);
}

.lang-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-base);
}

.lang-btn:hover,
.lang-btn.active {
    background: var(--primary-color);
    color: white;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    cursor: pointer;
}

/* ========== Hero Section ========== */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero.with-image {
    background-image: url('../images/hero/hero-bg.png');
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
}

.hero::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="1200" height="800" fill="url(%23grid)"/></svg>');
    animation: slideBackground 60s linear infinite;
}

@keyframes slideBackground {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-50%, -50%); }
}

.hero-content {
    text-align: center;
    color: var(--text-white);
    z-index: 1;
    padding: var(--spacing-lg);
    max-width: var(--container-lg);
}

.hero h1 {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 1s ease;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero .tagline {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 1s ease 0.2s both;
    font-weight: var(--font-weight-light);
}

.hero .subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease 0.4s both;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.6s both;
}

.cta-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    border: 2px solid white;
    background: transparent;
    color: white;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--border-radius-xl);
}

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

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

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

/* ========== Section 通用样式 Common Section Styles ========== */
section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.container {
    max-width: var(--container-xl);
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
    font-size: var(--font-size-4xl);
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-color);
}

.section-title p {
    color: var(--text-light);
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-md);
}

/* ========== About Section ========== */
.about {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text h3 {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.about-text p {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-relaxed);
}

.about-image {
    width: 100%;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.stat-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card .number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-card .label {
    color: var(--text-light);
    font-size: var(--font-size-base);
}

/* ========== 子品牌展示 Brands Section ========== */
.brands {
    background: var(--bg-white);
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.brand-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.brand-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: 0 15px 50px rgba(231, 76, 76, 0.2);
}

.brand-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

.brand-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Special styling for PAI logo */
.brand-card:has(img[alt*="PAI"]) .brand-icon {
    background: #ffffff;
    padding: var(--spacing-md);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    width: auto;
    height: auto;
    max-width: 200px;
}

.brand-card:has(img[alt*="PAI"]) .brand-icon img {
    width: auto;
    height: 80px;
    object-fit: contain;
}

.brand-card:has(img[src*="优途logo"]) .brand-icon {
    width: auto;
    height: auto;
    padding: var(--spacing-sm);
}

.brand-card:has(img[src*="优途logo"]) .brand-icon img {
    width: auto;
    height: 80px;
    object-fit: contain;
}

.brand-card h3 {
    font-size: var(--font-size-2xl);
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.brand-card .subtitle {
    color: var(--text-light);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.brand-card p {
    color: var(--text-light);
    line-height: var(--line-height-normal);
}

/* ========== 核心团队 Team Section ========== */
.team {
    background: var(--bg-light);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.team-member {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.team-member .avatar {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-4xl);
    color: white;
    border: 4px solid var(--bg-white);
    box-shadow: 0 5px 20px rgba(231, 76, 76, 0.3);
    overflow: hidden;
}

/* 团队成员照片 - 确保脸部居中 */
.team-member .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top; /* 确保脸部（通常在上方）居中 */
}

.team-member h4 {
    font-size: var(--font-size-xl);
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.team-member .role {
    color: var(--primary-color);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

.team-member .bio {
    color: var(--text-light);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
}

/* ========== 成果展示 Achievements Section ========== */
.achievements {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

.achievements::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><circle cx="200" cy="200" r="150" fill="rgba(255,255,255,0.05)"/><circle cx="900" cy="500" r="200" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.5;
}

.achievements .section-title h2,
.achievements .section-title p {
    color: var(--text-white);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.achievement-card {
    background: rgba(255,255,255,0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 2px solid rgba(255,255,255,0.2);
    transition: all var(--transition-base);
}

.achievement-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.achievement-card .number {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.achievement-card .label {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

/* ========== 竞赛成果 Competition Results ========== */
.competition-results {
    background: var(--bg-white);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.result-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-light);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
}

.result-item:hover {
    background: var(--primary-color);
    color: var(--text-white);
    transform: scale(1.05);
}

.result-item .icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-sm);
}

.result-item .count {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
}

.result-item .category {
    font-size: var(--font-size-base);
    opacity: 0.8;
}

.result-item .subjects {
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    opacity: 0.7;
}

/* ========== 核心优势 Advantages Section ========== */
.advantages {
    background: var(--bg-light);
}

.advantages-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.advantage-item {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border: 1px solid transparent;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.advantage-item .icon {
    width: 60px;
    height: 60px;
    background: rgba(231, 76, 76, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
    color: var(--primary-color);
    transition: all var(--transition-base);
}

.advantage-item:hover .icon {
    background: var(--primary-color);
    color: white;
    transform: rotate(360deg);
}

.advantage-item h4 {
    font-size: var(--font-size-lg);
    color: var(--text-dark);
    font-weight: var(--font-weight-medium);
    line-height: 1.4;
}

/* ========== 课程体系 Courses Section ========== */
.courses {
    background: var(--bg-white);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.course-category {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-base);
}

.course-category:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.course-category h3 {
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
}

.course-list li {
    padding: var(--spacing-sm) 0;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.course-list li:before {
    content: '▸';
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
    margin-right: var(--spacing-sm);
}

/* ========== 联系我们 Contact Section ========== */
.contact {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-light));
    color: var(--text-white);
}

.contact .section-title h2,
.contact .section-title p {
    color: var(--text-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.contact-card {
    background: rgba(255,255,255,0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 2px solid rgba(255,255,255,0.2);
    transition: all var(--transition-base);
}

.contact-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.contact-card h4 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact-card p {
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-relaxed);
    opacity: 0.9;
}

.contact-info {
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: rgba(255,255,255,0.1);
    border-radius: var(--border-radius-md);
}

.contact-info h3 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
}

.contact-info .phone {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--accent-color);
    margin: var(--spacing-sm) 0;
}

/* ========== Legal Section ========== */
.legal {
    background: var(--bg-light);
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
}

.legal .section-title p {
    max-width: 720px;
    margin: 0 auto;
}

.legal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.legal-card {
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-left: 6px solid var(--primary-color);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.legal-card h3 {
    margin: 0;
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.legal-card p {
    color: var(--text-light);
    line-height: var(--line-height-relaxed);
}

.legal-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.legal-card ul li {
    display: flex;
    gap: var(--spacing-sm);
    color: var(--text-dark);
    line-height: var(--line-height-relaxed);
}

.legal-card ul li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
}

.legal-note {
    margin-top: var(--spacing-xl);
    text-align: center;
    color: var(--text-light);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

/* ========== Footer ========== */
footer {
    background: var(--secondary-dark);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

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

.footer-logo img {
    max-width: 200px;
    height: auto;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

.link-group h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
}

.link-group a {
    display: block;
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-base);
}

.link-group a:hover {
    color: var(--primary-color);
    padding-left: var(--spacing-xs);
}

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

.copyright p {
    opacity: 0.7;
    font-size: var(--font-size-sm);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-logo {
        margin: 0 auto;
    }
    
    .footer-links {
        text-align: center;
    }
    
    .link-group {
        margin-bottom: var(--spacing-lg);
    }
}

/* ========== PAI App Section ========== */
.pai-app-download {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.app-store-btn {
    display: inline-flex;
    align-items: center;
    background: var(--bg-white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    color: var(--text-dark);
    font-weight: var(--font-weight-bold);
}

.app-store-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.app-store-btn img {
    height: 30px;
    width: auto;
    margin-right: var(--spacing-sm);
}

.qr-download {
    margin-top: var(--spacing-xl);
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    display: inline-block;
}

.qr-download img {
    width: 140px;
    height: 140px;
    display: block;
    object-fit: cover;
}

.qr-download p {
    color: var(--text-dark);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    text-align: center;
}

/* ========== 动画效果 Animations ========== */
.fade-in {
    opacity: 1;
    transform: translateY(0);
    transition: all var(--transition-slow);
}

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

/* ========== 返回顶部按钮 Back to Top ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    transition: all var(--transition-base);
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 0.8;
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-5px);
    background: var(--primary-dark);
    box-shadow: 0 6px 15px rgba(0,0,0,0.3);
    opacity: 1;
}

/* ========== 悬浮转化入口 Floating CTA ========== */
.floating-cta {
    position: fixed;
    right: 20px;
    bottom: 100px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 15px;
    animation: floatIn 0.5s ease-out;
}

@keyframes floatIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.floating-cta-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 15px 25px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    box-shadow: 0 4px 20px rgba(231, 76, 76, 0.4);
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.floating-cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(231, 76, 76, 0.6);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.floating-cta-btn.secondary {
    background: linear-gradient(135deg, #2C3E50 0%, #34495e 100%);
    box-shadow: 0 4px 20px rgba(44, 62, 80, 0.4);
}

.floating-cta-btn.secondary:hover {
    box-shadow: 0 6px 25px rgba(44, 62, 80, 0.6);
}

.floating-cta-btn .icon {
    font-size: 20px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .floating-cta {
        right: 15px;
        bottom: 80px;
        gap: 12px;
    }
    
    .floating-cta-btn {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .floating-cta-btn .icon {
        font-size: 18px;
    }
}

/* ========== 潜在客户收集表单 Lead Form ========== */
.lead-form input:focus,
.lead-form select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(231, 76, 76, 0.1);
}

.lead-form button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 76, 0.5);
}

.lead-form button[type="submit"]:active {
    transform: translateY(0);
}

.lead-form button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 移动端表单适配 */
@media (max-width: 768px) {
    .lead-form form {
        padding: 1.5rem;
    }
    
    .lead-form .section-title h2 {
        font-size: 1.5rem;
    }
    
    .lead-form .section-title p {
        font-size: 0.9rem;
    }
}

/* ========== AI Assistant ========== */
.ai-assistant {
    position: fixed;
    right: 24px;
    bottom: 32px;
    z-index: 9998;
}

.ai-assistant-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px 8px 8px;
    border-radius: 999px;
    border: none;
    background: var(--primary-color);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.ai-assistant-toggle img.ai-assistant-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(255,255,255,0.7);
    background: #fff;
}

.ai-assistant-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.25);
}

.ai-assistant-panel {
    position: absolute;
    right: 0;
    bottom: 72px;
    width: 360px;
    background: #fff;
    border-radius: 24px;
    box-shadow: 0 35px 80px rgba(0,0,0,0.25);
    border: 1px solid rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.ai-assistant-panel.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.ai-assistant-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px 12px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.ai-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: rgba(193, 18, 31, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-weight: 700;
}

.ai-assistant-header h3 {
    margin: 0;
    font-size: 1rem;
}

.ai-assistant-header p {
    margin: 4px 0 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.ai-assistant-close {
    margin-left: auto;
    background: transparent;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-light);
}

.ai-assistant-body {
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-message-list {
    max-height: 320px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-message {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

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

.ai-message-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    background: var(--bg-light);
    font-size: 0.92rem;
    line-height: 1.5;
    max-width: 240px;
}

.ai-message.user .ai-message-bubble {
    background: var(--primary-color);
    color: #fff;
}

.ai-message-actions {
    margin-top: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ai-message-actions a {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 0.8rem;
    color: inherit;
}

.ai-message.user .ai-message-actions a {
    border-color: rgba(255,255,255,0.4);
}

.ai-quick-questions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ai-quick-button {
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 0.85rem;
    background: #fff;
    cursor: pointer;
    transition: background var(--transition-base), transform var(--transition-base);
}

.ai-quick-button:hover {
    background: var(--bg-light);
    transform: translateY(-1px);
}

.ai-assistant-form {
    display: flex;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.ai-assistant-form input {
    flex: 1;
    border: none;
    padding: 14px 16px;
    font-size: 0.95rem;
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 0;
}

.ai-assistant-form input:focus {
    outline: none;
}

.ai-assistant-form button {
    border: none;
    background: var(--primary-color);
    color: #fff;
    padding: 0 20px;
    font-weight: 600;
    border-bottom-right-radius: 24px;
    cursor: pointer;
}

.ai-assistant-disclaimer {
    font-size: 0.75rem;
    color: var(--text-light);
    text-align: center;
    padding: 8px 14px 16px;
}

@media (max-width: 768px) {
    .ai-assistant {
        right: 16px;
        bottom: 20px;
    }

    .ai-assistant-panel {
        width: calc(100vw - 32px);
        right: -8px;
    }
}

/* 表单反馈 inline feedback */
.form-feedback {
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.5;
    display: none;
    animation: fade-in-up 0.3s ease forwards;
}

.form-feedback--success {
    background: #ecf9f1;
    color: #0f8a4c;
    border: 1px solid rgba(15, 138, 76, 0.2);
}

.form-feedback--warning {
    background: #fff7e6;
    color: #c47c00;
    border: 1px solid rgba(196, 124, 0, 0.25);
}

.form-feedback--error {
    background: #fdecea;
    color: #c0392b;
    border: 1px solid rgba(192, 57, 43, 0.2);
}

.form-feedback::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 8px;
    vertical-align: middle;
}

.form-feedback--success::before {
    background: #0f8a4c;
}

.form-feedback--warning::before {
    background: #f1c40f;
}

.form-feedback--error::before {
    background: #e74c3c;
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Toast 通知组件 Lead Toast ========== */
.lead-toast-container {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.lead-toast-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    opacity: 0;
    transition: opacity 0.25s ease;
}

.lead-toast-container.is-active {
    opacity: 1;
    pointer-events: auto;
}

.lead-toast-container.is-active::before {
    opacity: 1;
}

.lead-toast {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: var(--bg-white);
    border-radius: 18px;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.15);
    padding: 20px 24px;
    display: flex;
    gap: 14px;
    align-items: flex-start;
    border-left: 6px solid var(--primary-color);
    opacity: 0;
    transform: translateY(-15px) scale(0.98);
    animation: toast-in 0.35s ease forwards;
    pointer-events: auto;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
}

.lead-toast__icon {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
}

.lead-toast__content {
    flex: 1;
}

.lead-toast__title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.lead-toast__message {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

.lead-toast__close {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    margin-left: 8px;
}

.lead-toast--success {
    border-left-color: var(--success-color, #2ecc71);
}

.lead-toast--success .lead-toast__icon {
    background: var(--success-color, #2ecc71);
}

.lead-toast--warning {
    border-left-color: var(--warning-color, #f1c40f);
}

.lead-toast--warning .lead-toast__icon {
    background: var(--warning-color, #f1c40f);
}

.lead-toast--error {
    border-left-color: var(--danger-color, #e74c3c);
}

.lead-toast--error .lead-toast__icon {
    background: var(--danger-color, #e74c3c);
}

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

@media (max-width: 768px) {
    .lead-toast-container {
        padding: 16px;
    }
}

/* ========== Competition Database Tables ========== */
.competition-database {
    background: var(--bg-light);
}

.database-grid {
    display: grid;
    /* Optimized for readability: wider cards to prevent table cramping */
    grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
    gap: var(--spacing-lg);
}

@media (max-width: 768px) {
    .database-grid {
        grid-template-columns: 1fr;
    }
}

.database-card {
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg); /* Reduced padding slightly for more content space */
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    height: 100%;
    border: 1px solid rgba(0,0,0,0.05);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.database-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.database-card h3 {
    font-size: 1.5rem; /* Slightly adjusted size */
    color: var(--primary-color);
    border-bottom: 2px solid rgba(231, 76, 76, 0.1);
    padding-bottom: 0.5rem;
    margin-bottom: 0.2rem;
}

.database-card table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    table-layout: fixed; /* Enforce column widths if possible */
}

.database-card th,
.database-card td {
    border-bottom: 1px solid rgba(0,0,0,0.06);
    padding: 12px 8px;
    vertical-align: top;
    text-align: left;
    color: var(--text-dark);
    line-height: 1.5;
    word-wrap: break-word; /* Ensure long words don't overflow */
}

/* Column Width Allocation */
.database-card th:nth-child(1) { width: 25%; } /* Event */
.database-card th:nth-child(2) { width: 30%; } /* Schedule */
.database-card th:nth-child(3) { width: 45%; } /* Highlights */

.database-card tbody tr:last-child th,
.database-card tbody tr:last-child td {
    border-bottom: none;
}

.database-card th {
    font-weight: var(--font-weight-semibold);
    color: var(--text-dark);
    background: rgba(231, 76, 76, 0.05);
}

.host {
    color: var(--text-light);
    font-size: 0.85em;
    font-weight: var(--font-weight-medium);
}

.database-note {
    margin-top: var(--spacing-lg);
    text-align: center;
    color: var(--text-light);
    font-size: 0.95rem;
}

.text-link {
    color: var(--primary-color);
    font-weight: var(--font-weight-medium);
    border-bottom: 1px solid currentColor;
    padding-bottom: 2px;
}

.text-link:hover {
    opacity: 0.8;
}

@media (max-width: 768px) {
    .database-card {
        padding: var(--spacing-lg);
    }

    .database-card table {
        font-size: 0.85rem;
    }
}

/* Competition details section */
.competition-details {
    background: var(--bg-white);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.detail-card {
    background: var(--bg-light);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.detail-card h3 {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.detail-card .host {
    font-size: 0.9rem;
    color: var(--text-light);
}

.detail-list {
    margin: var(--spacing-sm) 0 var(--spacing-md) 1rem;
    padding: 0;
}

.detail-list li {
    margin-bottom: 0.35rem;
    color: var(--text-dark);
    line-height: 1.6;
}

.detail-list li strong {
    font-weight: var(--font-weight-semibold);
}

.detail-card .text-link {
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .detail-card {
        padding: var(--spacing-lg);
    }
}

/* ========== Competition Planner Inline Styles Moved to CSS ========== */

/* Subject Tabs Container */
.subject-tabs-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

/* Track Form */
.track-form {
    /* display: none; handled by JS or inline style for toggling */
}

/* Generate Button */
.planner-generate-btn {
    width: 100%;
    margin-top: 1rem;
}

/* Filter Reset Button */
.planner-reset-btn {
    width: 100%;
    margin-top: 1rem;
}

/* Lead Form Styles from Planner Page */
.planner-lead-form-section {
    background: linear-gradient(135deg, #E74C4C 0%, #C0392B 100%);
    color: #fff;
}

.planner-lead-form-section .section-title h2,
.planner-lead-form-section .section-title p {
    color: #fff;
}

.planner-lead-form-section .section-title p {
    color: rgba(255, 255, 255, 0.85);
}

.planner-lead-form-container {
    max-width: 640px;
    margin: 2rem auto 0;
}

.planner-lead-form-box {
    background: #fff;
    padding: 2.5rem;
    border-radius: 16px;
    color: var(--text-dark);
}

.planner-lead-form-group {
    margin-bottom: 1.2rem;
}

.planner-lead-form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.planner-lead-form-input,
.planner-lead-form-select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
}

.planner-lead-form-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #E74C4C 0%, #C0392B 100%);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
}

.planner-lead-form-note {
    margin-top: 1rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}