/* ================================================
   Apple-Inspired Design System
   简约 · 精致 · 注重细节
   ================================================ */

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

/* === 设计令牌 === */
:root {
    /* 颜色系统 */
    --bg-deep: #000000;
    --bg-surface: #0a0a0a;
    --bg-elevated: #141414;
    --bg-card: #1a1a1a;
    --bg-card-hover: #222222;

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --text-quaternary: rgba(255, 255, 255, 0.3);

    /* 语义色 */
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.15);

    /* 边框与分割线 */
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-medium: rgba(255, 255, 255, 0.12);

    /* 间距系统 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 50%;

    /* 过渡 */
    --ease-apple: cubic-bezier(0.25, 0.1, 0.25, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 0.15s;
    --duration-normal: 0.3s;
    --duration-slow: 0.5s;
}

/* === 全局样式 === */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display',
                 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-deep);
    overflow-x: hidden;
}

/* === 环境光效 === */
.ambient-light {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.light-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    transition: transform 0.3s var(--ease-apple);
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    top: -200px;
    right: -200px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    opacity: 0.3;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.2;
}

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background var(--duration-normal) var(--ease-apple),
                backdrop-filter var(--duration-normal) var(--ease-apple),
                border-color var(--duration-normal) var(--ease-apple);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--text-primary);
}

.logo-symbol {
    font-size: 1.25rem;
    color: var(--accent-primary);
}

.logo-text {
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: -0.01em;
    transition: color var(--duration-fast) var(--ease-apple);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transform: translateX(-50%);
    transition: width var(--duration-normal) var(--ease-apple);
}

.nav-link:hover {
    color: var(--text-primary);
}

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

/* === Hero 区域 === */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-4xl) var(--space-xl) var(--space-3xl);
    z-index: 1;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

.title-line {
    display: block;
}

.title-gradient {
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 50%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.text-highlight {
    color: var(--text-primary);
    font-weight: 500;
}

/* === 按钮系统 === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--duration-normal) var(--ease-apple);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-secondary);
    box-shadow: 0 0 0 4px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-arrow {
    transition: transform var(--duration-normal) var(--ease-apple);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--text-tertiary);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

/* === 统计数据 === */
.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.stat {
    text-align: left;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.stat-divider {
    width: 1px;
    height: 32px;
    background: var(--border-medium);
}

/* === Hero 视觉元素 === */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card-container {
    position: relative;
    width: 320px;
    height: 320px;
}

.hero-card {
    position: absolute;
    width: 140px;
    height: 140px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    overflow: hidden;
    transition: transform var(--duration-slow) var(--ease-spring);
}

.main-card {
    width: 180px;
    height: 180px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}

.card-emoji {
    font-size: 3rem;
}

.card-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.card-shine {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(255, 255, 255, 0.03) 50%,
        transparent 70%
    );
    animation: shine 3s ease-in-out infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.float-card {
    width: 80px;
    height: 80px;
    z-index: 1;
}

.float-card .card-emoji {
    font-size: 1.75rem;
}

.float-1 {
    top: 0;
    right: 0;
    animation: float 6s ease-in-out infinite;
}

.float-2 {
    bottom: 20px;
    left: 0;
    animation: float 6s ease-in-out infinite 2s;
}

.float-3 {
    bottom: 0;
    right: 40px;
    animation: float 6s ease-in-out infinite 4s;
}

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

/* === 分隔线 === */
.section-divider {
    padding: var(--space-2xl) 0;
    display: flex;
    justify-content: center;
}

.divider-line {
    width: 1px;
    height: 80px;
    background: linear-gradient(to bottom, transparent, var(--border-medium), transparent);
}

/* === 通用区块样式 === */
.works-section,
.students-section,
.contact-section {
    position: relative;
    padding: var(--space-4xl) var(--space-xl);
    z-index: 1;
}

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

.section-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* === 作品卡片 === */
.works-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.work-card {
    display: grid;
    grid-template-columns: 120px 1fr;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    gap: var(--space-lg);
    transition: all var(--duration-normal) var(--ease-apple);
    opacity: 0;
    transform: translateY(20px);
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
}

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

.work-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-medium);
    transform: translateY(-4px);
}

.work-visual {
    position: relative;
    width: 120px;
    height: 120px;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.work-bg-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, var(--accent) 0%, transparent 60%);
    opacity: 0.8;
}

.work-icon {
    font-size: 2.5rem;
    position: relative;
    z-index: 1;
}

.work-content {
    display: flex;
    flex-direction: column;
}

.work-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.work-tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.work-year {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.work-title {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.work-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.work-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: gap var(--duration-fast) var(--ease-apple);
}

.work-link:hover {
    gap: var(--space-sm);
}

/* === 学员作品 === */
.students-showcase {
    max-width: 1200px;
    margin: 0 auto;
}

.student-card.featured {
    display: grid;
    grid-template-columns: 240px 1fr;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.student-visual {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.student-visual.compact {
    aspect-ratio: 16/10;
}

.student-emoji {
    font-size: 4rem;
    position: relative;
    z-index: 1;
}

.student-visual:not(.compact) .student-emoji {
    font-size: 5rem;
}

.student-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 40% 40%, var(--accent-primary), var(--accent-secondary));
    opacity: 0.6;
}

.student-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.student-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--accent-glow);
    color: var(--accent-primary);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    width: fit-content;
    margin-bottom: var(--space-md);
}

.student-info h3 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--space-md);
}

.student-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.student-footer {
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-subtle);
}

.student-name {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.students-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.students-grid .student-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--duration-normal) var(--ease-apple);
}

.students-grid .student-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-medium);
    transform: translateY(-4px);
}

.students-grid .student-info h3 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    margin-top: var(--space-md);
}

.students-grid .student-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.students-grid .student-name {
    font-size: 0.75rem;
}

.students-cta {
    text-align: center;
    margin-top: var(--space-2xl);
}

.students-cta p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.text-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--duration-fast) var(--ease-apple);
}

.text-link:hover {
    color: var(--accent-secondary);
}

/* === 联系方式 === */
.contact-section {
    background: var(--bg-surface);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
}

.contact-main {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.contact-title {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin: var(--space-lg) 0;
}

.contact-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.contact-channels {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.channel-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-apple);
}

.channel-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-medium);
    transform: translateX(8px);
}

.channel-icon-wrapper {
    width: 48px;
    height: 48px;
    background: var(--accent-glow);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.channel-icon {
    color: var(--accent-primary);
}

.channel-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.channel-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.channel-value {
    font-size: 1rem;
    color: var(--text-primary);
}

.channel-arrow {
    color: var(--text-tertiary);
    transition: transform var(--duration-normal) var(--ease-apple);
}

.channel-card:hover .channel-arrow {
    transform: translateX(4px);
    color: var(--accent-primary);
}

/* === Footer === */
.footer {
    margin-top: var(--space-4xl);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.footer-logo .logo-symbol {
    color: var(--text-tertiary);
}

.footer-text {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.footer-divider {
    width: 1px;
    height: 20px;
    background: var(--border-subtle);
}

.footer-copy {
    font-size: 0.8125rem;
    color: var(--text-quaternary);
}

/* === 响应式设计 === */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

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

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

    .student-card.featured {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --space-4xl: 4rem;
        --space-3xl: 3rem;
    }

    .nav-links {
        gap: var(--space-md);
    }

    .nav-link {
        font-size: 0.8125rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

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

    .work-card {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .work-visual {
        width: 100%;
        height: 100px;
    }

    .desktop-only {
        display: none;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        justify-content: center;
    }

    .stat-divider {
        display: none;
    }
}

/* === 滚动条美化 === */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-medium);
}

/* === 选中文本样式 === */
::selection {
    background: var(--accent-primary);
    color: white;
}

::-moz-selection {
    background: var(--accent-primary);
    color: white;
}

/* ================================================
   AI 助手样式
   ================================================ */

.ai-assistant {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: 9999;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* 聊天按钮 */
.chat-toggle {
    position: relative;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    transition: all var(--duration-normal) var(--ease-apple);
}

.chat-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 30px rgba(99, 102, 241, 0.5);
}

.chat-toggle:active {
    transform: scale(0.95);
}

.chat-toggle .chat-icon {
    color: white;
    transition: opacity var(--duration-normal) var(--ease-apple);
}

.chat-toggle .close-icon {
    position: absolute;
    color: white;
    opacity: 0;
    transform: rotate(90deg);
    transition: all var(--duration-normal) var(--ease-apple);
}

.chat-toggle.active .chat-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

.chat-toggle.active .close-icon {
    opacity: 1;
    transform: rotate(0);
}

.chat-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 14px;
    height: 14px;
    background: #ef4444;
    border: 2px solid var(--bg-deep);
    border-radius: 50%;
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-apple);
}

.chat-badge.show {
    opacity: 1;
    animation: badge-pulse 2s ease-in-out infinite;
}

@keyframes badge-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* 聊天窗口 */
.chat-window {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 380px;
    height: 520px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.95);
    transform-origin: bottom right;
    transition: all var(--duration-normal) var(--ease-apple);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

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

.chat-window.minimized {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.95);
}

/* 聊天头部 */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-subtle);
}

.chat-header-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.chat-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.chat-title {
    display: flex;
    flex-direction: column;
}

.title-text {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

.title-status {
    font-size: 0.75rem;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.title-status::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.chat-minimize {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast) var(--ease-apple);
}

.chat-minimize:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

/* 消息区域 */
.chat-messages {
    flex: 1;
    padding: var(--space-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 2px;
}

.message {
    display: flex;
    gap: var(--space-sm);
    max-width: 85%;
    animation: message-in var(--duration-normal) var(--ease-spring);
}

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

.bot-message {
    align-self: flex-start;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.user-message .message-avatar {
    background: var(--bg-elevated);
}

.message-content {
    background: var(--bg-elevated);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    border-top-left-radius: 4px;
}

.user-message .message-content {
    background: var(--accent-primary);
    border-radius: var(--radius-lg);
    border-top-right-radius: 4px;
}

.message-content p {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin: 0;
}

.user-message .message-content p {
    color: white;
}

.message-content p + p {
    margin-top: var(--space-sm);
}

/* 快捷问题 */
.quick-questions {
    list-style: none;
    margin-top: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.quick-question-btn {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    text-align: left;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-apple);
}

.quick-question-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* 输入区域 */
.chat-input-area {
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-elevated);
    border-top: 1px solid var(--border-subtle);
}

.input-wrapper {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-xs) var(--space-xs) var(--space-xs) var(--space-md);
    transition: border-color var(--duration-fast) var(--ease-apple);
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.chat-input::placeholder {
    color: var(--text-quaternary);
}

.send-button {
    width: 36px;
    height: 36px;
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast) var(--ease-apple);
    flex-shrink: 0;
}

.send-button:hover {
    background: var(--accent-secondary);
}

.send-button:disabled {
    background: var(--bg-card-hover);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.chat-footer {
    text-align: center;
    margin-top: var(--space-sm);
    font-size: 0.6875rem;
    color: var(--text-quaternary);
}

/* 打字动画 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--space-md);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-tertiary);
    border-radius: 50%;
    animation: typing 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* API Key 配置界面 */
.api-config {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    text-align: center;
    animation: config-in var(--duration-normal) var(--ease-spring);
}

@keyframes config-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.config-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.api-config h3 {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.api-config > p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

/* 配置选项卡 */
.config-tabs {
    display: flex;
    gap: var(--space-xs);
    background: var(--bg-elevated);
    padding: 4px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.config-tab {
    flex: 1;
    padding: var(--space-xs) var(--space-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-apple);
}

.config-tab:hover {
    color: var(--text-secondary);
}

.config-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* 配置模式 */
.config-mode {
    width: 100%;
    animation: mode-in 0.2s var(--ease-apple);
}

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

.mode-desc {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}

.config-input-group {
    display: flex;
    gap: var(--space-sm);
    width: 100%;
    margin-bottom: var(--space-md);
}

.config-input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
    transition: border-color var(--duration-fast) var(--ease-apple);
}

.config-input:focus {
    border-color: var(--accent-primary);
}

.config-input::placeholder {
    color: var(--text-quaternary);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.config-button {
    padding: var(--space-sm) var(--space-lg);
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-apple);
}

.config-button:hover {
    background: var(--accent-secondary);
}

.config-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    line-height: 1.5;
}

.config-hint a {
    color: var(--accent-primary);
    text-decoration: none;
}

.config-hint a:hover {
    text-decoration: underline;
}

/* Worker URL 配置 */
.worker-url-config {
    width: 100%;
    margin-top: var(--space-md);
    text-align: left;
}

.worker-url-config summary {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: color var(--duration-fast) var(--ease-apple);
}

.worker-url-config summary:hover {
    color: var(--text-secondary);
}

.worker-url-config[open] summary {
    margin-bottom: var(--space-sm);
}

/* 聊天内容区域 */
.chat-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* 头部操作按钮 */
.chat-header-actions {
    display: flex;
    gap: var(--space-xs);
}

.header-icon-btn {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast) var(--ease-apple);
}

.header-icon-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

/* 响应式 */
@media (max-width: 480px) {
    .ai-assistant {
        bottom: var(--space-md);
        right: var(--space-md);
    }

    .chat-window {
        width: calc(100vw - var(--space-xl) * 2);
        height: calc(100vh - 160px);
        max-height: 520px;
    }

    .chat-toggle {
        width: 52px;
        height: 52px;
    }
}