/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #ffffff;
    --secondary-color: #f7f9fc;
    --accent-color: #edf2f7;
    --ink-strong: #1f2937; /* 标题/正文深色 */
    --ink-normal: #374151;
    --ink-muted: #6b7280;
    --brand-1: #2f6df6;
    --brand-2: #7c3aed;
    --brand-3: #00b894;
    --text-primary: var(--ink-strong);
    --text-secondary: var(--ink-muted);
    --gradient-1: linear-gradient(135deg, #2f6df6 0%, #7c3aed 100%);
    --gradient-2: linear-gradient(135deg, #7c3aed 0%, #00b894 100%);
    --gradient-3: linear-gradient(135deg, #60a5fa 0%, #34d399 100%);
    --gradient-4: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(15, 23, 42, 0.08);
    --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Serif SC', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--primary-color);
    color: var(--text-primary);
    line-height: 1.85;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
    border-bottom: 1px solid var(--glass-border);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-soft);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--ink-normal);
    text-decoration: none;
    font-weight: 400;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--ink-strong);
}

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

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

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ===== 首页 ===== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(47, 109, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(0, 184, 148, 0.08) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

/* 聊天对话气泡样式 */
.chat-container {
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.chat-date {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    padding: 0.5rem 0;
}

.chat-message {
    display: flex;
    align-items: flex-end;
    margin-bottom: 1.5rem;
    gap: 0.75rem;
}

.chat-message.chat-left {
    justify-content: flex-start;
}

.chat-message.chat-right {
    justify-content: flex-end;
}

.chat-avatar {
    flex-shrink: 0;
}

.chat-avatar-img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.chat-bubble {
    max-width: 75%;
    padding: 1rem 1.25rem;
    border-radius: 18px;
    position: relative;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.chat-bubble-left {
    background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
    border-bottom-left-radius: 4px;
}

.chat-bubble-right {
    background: linear-gradient(135deg, #2f6df6 0%, #7c3aed 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.chat-text {
    font-size: 1.1rem;
    line-height: 1.6;
    margin: 0 0 0.5rem 0;
    color: inherit;
}

.chat-bubble-right .chat-text {
    color: white;
}

.chat-author {
    font-size: 0.75rem;
    opacity: 0.7;
    display: block;
    margin-top: 0.25rem;
}

.hero-profile-img {
    width: 140px;
    height: 140px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid #fff;
    box-shadow: var(--shadow-soft);
    animation: float-icon 4s ease-in-out infinite;
}

.sunflower-img {
    max-width: 320px;
    width: 90%;
    height: auto;
    filter: drop-shadow(0 8px 18px rgba(0,0,0,0.12));
    border-radius: 12px;
    margin-bottom: 16px; /* 与正文稍微拉开 */
}

.quote-text {
    font-size: 1.3rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.quote-author {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.quote-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

.hero-main-text {
    text-align: left;
    max-width: 800px;
    margin: 0 auto;
}

.hero-main-text h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-main-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.9;
}

.hero-main-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* 淡入动画 */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }
.delay-6 { animation-delay: 0.6s; }
.delay-7 { animation-delay: 0.7s; }
.delay-8 { animation-delay: 0.8s; }
.delay-9 { animation-delay: 0.9s; }

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--text-secondary);
    border-radius: 20px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

.floating-capsule {
    position: absolute;
    right: 24px;
    bottom: 24px;
    width: 110px;
    height: 42px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ffd166 100%);
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(255, 107, 107, 0.25);
    animation: capsuleFloat 4.5s ease-in-out infinite;
}

.floating-capsule::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 55px;
    height: 42px;
    background: linear-gradient(135deg, #06beb6 0%, #48b1bf 100%);
    border-top-left-radius: 24px;
    border-bottom-left-radius: 24px;
}

@keyframes capsuleFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); filter: drop-shadow(0 8px 20px rgba(0,0,0,0.12)); }
    50% { transform: translateY(-10px) rotate(2deg); filter: drop-shadow(0 12px 24px rgba(0,0,0,0.16)); }
}

/* Quote avatars */
.quote-avatars {
    display: flex;
    justify-content: flex-end;
    margin-top: 12px;
}

.avatar {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 8px 12px;
    border-radius: 999px;
    box-shadow: var(--shadow-soft);
}

.avatar-img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.avatar-name {
    color: var(--ink-strong);
    font-weight: 600;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(20px); }
}

/* ===== Section 通用样式 ===== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ===== 科研方向 ===== */
.research-section {
    background: var(--secondary-color);
}

.research-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.9;
}

.research-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    animation: float-icon 3s ease-in-out infinite;
}

@keyframes float-icon {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.research-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.research-card p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.9;
}

.research-list {
    list-style: none;
    padding-left: 0;
    margin: 1.5rem 0;
}

.research-list li {
    padding: 0.8rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.research-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--highlight-color);
    font-weight: bold;
}

.research-conclusion {
    text-align: center;
    max-width: 800px;
    margin: 4rem auto 0;
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.9;
}

/* ===== 团队 ===== */
.people-section {
    background: var(--accent-color);
}

.people-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.9;
}

.people-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.people-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
}

.people-icon {
    font-size: 4rem;
    animation: float-icon 3s ease-in-out infinite;
}

.people-header h3 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.people-role {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.people-content p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.9;
}

.team-culture {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.team-culture h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.team-culture p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.9;
}

/* ===== 招聘 ===== */
.join-section {
    background: var(--secondary-color);
}

.join-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.9;
}

.philosophy-box {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.philosophy-box h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.philosophy-list {
    list-style: none;
    margin: 1.5rem 0;
}

.philosophy-list li {
    padding: 1rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    border-bottom: 1px solid var(--glass-border);
}

.philosophy-list li:last-child {
    border-bottom: none;
}

.philosophy-list li::before {
    content: '✨';
    position: absolute;
    left: 0;
}

.positions {
    margin: 3rem 0;
}

.positions h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
}

.position-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.position-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.position-layout {
    display: flex;
    align-items: stretch;
    gap: 2rem;
}

.position-content {
    flex: 1;
    min-width: 0;
}

.position-divider {
    width: 1px;
    background: repeating-linear-gradient(
        to bottom,
        #d1d5db 0px,
        #d1d5db 8px,
        transparent 8px,
        transparent 16px
    );
    flex-shrink: 0;
    margin: 0 1rem;
}

.position-image {
    flex: 0 0 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.position-img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 12px;
    object-fit: cover;
    display: block;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.position-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.position-number {
    width: 40px;
    height: 40px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: white;
}

.position-header h4 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.position-details p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    line-height: 1.8;
}

.position-details strong {
    color: var(--text-primary);
}

.benefits-box, .apply-box {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    margin: 3rem 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.benefits-box h3, .apply-box h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.benefits-list, .apply-list {
    list-style: none;
    margin: 1.5rem 0;
}

.benefits-list li, .apply-list li {
    padding: 1rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.benefits-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--highlight-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.apply-list li::before {
    content: counter(list-counter);
    counter-increment: list-counter;
    position: absolute;
    left: 0;
    color: var(--highlight-color);
    font-weight: bold;
}

.apply-list {
    counter-reset: list-counter;
}

.email-link {
    color: var(--highlight-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

.email-link:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.closing-text {
    text-align: center;
    font-size: 1.3rem;
    margin-top: 2rem;
    color: var(--text-primary);
}

/* ===== 捐赠与支持 ===== */
.support-section {
    background: var(--secondary-color);
}

.support-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.9;
}

.support-types h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
}

.support-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.support-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.support-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    animation: float-icon 3s ease-in-out infinite;
}

.support-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.support-card p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.9;
}

.commitment-box {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    margin: 3rem 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.commitment-box h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.commitment-list {
    list-style: none;
    margin: 1.5rem 0;
}

.commitment-list li {
    padding: 1rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.commitment-list li::before {
    content: '⚖️';
    position: absolute;
    left: 0;
}

.contact-box {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    margin-top: 3rem;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.contact-box h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.contact-box p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.9;
}

/* ===== 伦理声明 ===== */
.ethics-section {
    background: var(--accent-color);
}

.ethics-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.principle-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.principle-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
    border-color: rgba(102, 126, 234, 0.4);
}

.principle-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    animation: float-icon 3s ease-in-out infinite;
}

.principle-card h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.principle-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.ethics-approval {
    margin-top: 4rem;
}

.ethics-approval h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
}

.approval-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.approval-2cols {
    grid-template-columns: repeat(2, 1fr);
}
/* Publications pretty list numbers */
ol.publications-list {
    counter-reset: pub;
    list-style: none;
    padding-left: 0;
}

ol.publications-list > li.publication-item {
    counter-increment: pub;
    position: relative;
    padding-left: 3rem;
    margin: 0.75rem 0;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

ol.publications-list > li.publication-item::before {
    content: counter(pub);
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gradient-3);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

.approval-2cols .approval-img {
    width: 100%;
    height: auto;
}

.approval-image-item {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.approval-image-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.3);
}

.approval-img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    object-fit: contain;
    display: block;
    transition: transform 0.3s ease;
    background: transparent;
    border: none;
}

.approval-image-item:hover .approval-img {
    transform: scale(1.05);
}

/* ===== 采访与视频 ===== */
.interviews-section {
    background: var(--secondary-color);
}

.interviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.interview-item {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.interview-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
    border-color: rgba(102, 126, 234, 0.4);
}

.interview-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
    background: transparent;
    border: none;
}

.interview-item:hover .interview-img {
    transform: scale(1.1);
}

.interview-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.interview-item:hover .interview-overlay {
    opacity: 1;
}

.interview-link-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.interview-overlay p {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ===== 代表论文 ===== */
.publications-section {
    background: var(--accent-color);
}

.publications-list {
    margin-bottom: 3rem;
}

.publication-item {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.publication-item p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 2rem;
}

.publication-card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.publication-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
    border-color: rgba(102, 126, 234, 0.4);
}

.publication-img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
    background: transparent;
    border: none;
}

.publication-card:hover .publication-img {
    transform: scale(1.1);
}

.publication-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.publication-card:hover .publication-overlay {
    opacity: 1;
}

.publication-link-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.publication-overlay p {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
    background: #ffffff;
    padding: 3rem 0;
    border-top: 1px solid var(--glass-border);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.footer-contact {
    margin-bottom: 1rem;
}

.footer-contact p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.footer-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-style: italic;
}

/* ===== 模态框 ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--secondary-color);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    max-width: 500px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.modal-link-btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--gradient-1);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.modal-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: #ffffff; /* 提升对比度，白底 */
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 3rem;
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        color: var(--ink-strong);
        font-size: 1.1rem;
        padding: 0.75rem 0;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--glass-border);
    }

    .nav-toggle {
        display: flex;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-main-text h1 {
        font-size: 1.8rem;
    }

    .hero-main-text p {
        font-size: 1rem;
    }

    .quote-text {
        font-size: 1.1rem;
    }

    .research-card, .people-card, .position-card, .support-card {
        padding: 2rem;
    }

    .position-layout {
        flex-direction: column;
        gap: 1.5rem;
    }

    .position-divider {
        width: 100%;
        height: 1px;
        background: repeating-linear-gradient(
            to right,
            #d1d5db 0px,
            #d1d5db 8px,
            transparent 8px,
            transparent 16px
        );
        margin: 0.5rem 0;
    }

    .position-image {
        flex: 1;
        width: 100%;
    }

    .position-img {
        max-width: 100%;
    }

    .chat-container {
        max-width: 100%;
        padding: 0 1rem;
    }

    .chat-bubble {
        max-width: 85%;
    }

    .ethics-principles {
        grid-template-columns: 1fr;
    }

    .publications-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .interviews-grid {
        grid-template-columns: 1fr;
    }

    .approval-images {
        grid-template-columns: 1fr;
    }
}