/* ========================================
   Hero首页样式 - 现代化着陆页设计
   ======================================== */

/* 全局平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* ========== Hero 首页整体布局 ========== */
.hero-page {
    min-height: 100vh;
    background: var(--gradient-hero);
    background-image: var(--bg-pattern);
    position: relative;
    overflow-x: hidden;
}

/* ========== Hero 顶部导航 ========== */
.hero-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 48px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.hero-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.hero-logo svg {
    width: 28px;
    height: 28px;
    stroke-width: 2;
}

.hero-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.btn-settings-hero {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-settings-hero svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.btn-settings-hero:hover {
    border-color: var(--primary-color);
    background: var(--primary-bg);
}

.btn-settings-hero:hover svg {
    color: var(--primary-color);
}

/* ========== Hero 主区域 ========== */
.hero-main {
    padding: 140px 48px 60px;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70vh;
    position: relative;
}

.hero-content {
    max-width: 650px;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: white;
    border-radius: var(--border-radius-pill);
    font-size: 0.875rem;
    color: var(--primary-color);
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.hero-badge svg {
    width: 16px;
    height: 16px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.text-gradient {
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #db2777 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 40px;
    min-height: 3.6em; /* 预留两行高度，防止布局跳动 */
}

/* 打字机效果 */
.typewriter-text {
    /* 文字显示 */
}

.typewriter-cursor {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 300;
    animation: cursorBlink 1s infinite;
    margin-left: 2px;
}

@keyframes cursorBlink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

.hero-cta {
    display: flex;
    gap: 16px;
}

.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-pill);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(37, 99, 235, 0.4);
}

.btn-hero-primary svg {
    width: 20px;
    height: 20px;
}

.btn-hero-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(37, 99, 235, 0.3);
}

.btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-hero-secondary svg {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.btn-hero-secondary:hover {
    border-color: var(--primary-color);
    background: var(--primary-bg);
    transform: translateY(-2px);
}

/* ========== Hero 右侧：纯抛物线艺术动画 ========== */
.hero-decoration {
    position: absolute;
    right: 48px;
    /* 补偿固定导航栏高度(~60px)，在可视内容区居中 */
    top: calc(50% + 30px);
    transform: translateY(-50%);
    width: 480px;
    pointer-events: none;
    animation: heroArtFloat 6s ease-in-out infinite;
}

@keyframes heroArtFloat {
    0%, 100% { transform: translateY(-50%); }
    50% { transform: translateY(calc(-50% - 12px)); }
}

/* --- SVG 画布 --- */
.hero-art-svg {
    width: 100%;
    height: auto;
    display: block;
    overflow: visible;
}

/* --- 抛物线曲线：描边绘制入场 --- */
.hero-curve {
    fill: none;
    stroke-linecap: round;
    stroke-dasharray: 800;
    stroke-dashoffset: 800;
    animation: heroCurveDraw 2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
.hero-curve.c1 { animation-delay: 0.2s; }
.hero-curve.c2 { animation-delay: 0.6s; }
.hero-curve.c3 { animation-delay: 1.0s; }

@keyframes heroCurveDraw {
    to { stroke-dashoffset: 0; }
}

/* --- 流光 shimmer 效果（叠加在曲线上） --- */
.hero-curve.c1 {
    animation: heroCurveDraw 2s cubic-bezier(0.4,0,0.2,1) 0.2s forwards,
               heroShimmer1 4s ease-in-out 2.5s infinite;
}
.hero-curve.c2 {
    animation: heroCurveDraw 2s cubic-bezier(0.4,0,0.2,1) 0.6s forwards,
               heroShimmer2 5s ease-in-out 3s infinite;
}
.hero-curve.c3 {
    animation: heroCurveDraw 2s cubic-bezier(0.4,0,0.2,1) 1.0s forwards,
               heroShimmer3 6s ease-in-out 3.5s infinite;
}

@keyframes heroShimmer1 {
    0%, 100% { opacity: 0.8; filter: brightness(1); }
    50% { opacity: 1; filter: brightness(1.4) drop-shadow(0 0 8px rgba(37,99,235,0.5)); }
}
@keyframes heroShimmer2 {
    0%, 100% { opacity: 0.5; filter: brightness(1); }
    50% { opacity: 0.8; filter: brightness(1.3) drop-shadow(0 0 6px rgba(6,182,212,0.4)); }
}
@keyframes heroShimmer3 {
    0%, 100% { opacity: 0.5; filter: brightness(1); }
    50% { opacity: 0.8; filter: brightness(1.3) drop-shadow(0 0 6px rgba(249,115,22,0.4)); }
}

/* --- 填充区域淡入 --- */
.hero-area {
    opacity: 0;
    animation: heroAreaFadeIn 1.5s ease-out 1.8s forwards;
}
@keyframes heroAreaFadeIn {
    to { opacity: 0.04; }
}

/* --- 顶点光晕：脉冲辉光 --- */
.hero-vertex-glow {
    animation: heroGlowPulse 3s ease-in-out infinite;
}
@keyframes heroGlowPulse {
    0%, 100% { opacity: 0.8; r: 6; }
    50% { opacity: 1; r: 9; filter: drop-shadow(0 0 10px rgba(37,99,235,0.6)); }
}

/* --- 顶点光环：呼吸扩散 --- */
.hero-vertex-ring {
    animation: heroRingBreathe 3s ease-in-out infinite;
}
@keyframes heroRingBreathe {
    0%, 100% { opacity: 0.15; r: 12; }
    50% { opacity: 0.08; r: 22; }
}

/* --- 装饰圆点：呼吸脉冲（无位移，跟随容器整体浮动） --- */
.hero-dot {
    animation: heroDotPulse 4s ease-in-out infinite;
}
.hero-dot.d1 { animation-delay: 0s; }
.hero-dot.d2 { animation-delay: 1.2s; }
.hero-dot.d3 { animation-delay: 0.6s; animation-duration: 5s; }
.hero-dot.d4 { animation-delay: 1.8s; animation-duration: 6s; }

@keyframes heroDotPulse {
    0%, 100% { opacity: 0.5; r: 3; }
    50% { opacity: 0.9; r: 5; filter: drop-shadow(0 0 4px currentColor); }
}

/* --- 漂浮公式标签：毛玻璃胶囊 --- */
.hero-float-tag {
    position: absolute;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(37, 99, 235, 0.12);
    border-radius: 20px;
    font-family: 'Times New Roman', 'Georgia', serif;
    font-style: italic;
    font-size: 0.9rem;
    color: #334155;
    white-space: nowrap;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08), 0 1px 4px rgba(0, 0, 0, 0.04);
    pointer-events: none;
    opacity: 0;
    animation: heroTagFadeIn 0.8s ease-out forwards;
}

/* 标签1: y = ax² + bx + c — 左上方 */
.hero-float-tag.t1 {
    top: 8%;
    left: -5%;
    animation: heroTagFadeIn 0.8s ease-out 2.2s forwards,
               heroTagFloat1 7s ease-in-out 3s infinite;
    color: #2563eb;
    font-weight: 600;
}
/* 标签2: 顶点(h,k) — 右上方 */
.hero-float-tag.t2 {
    top: 15%;
    right: -2%;
    animation: heroTagFadeIn 0.8s ease-out 2.6s forwards,
               heroTagFloat2 8s ease-in-out 3.4s infinite;
    color: #7c3aed;
}
/* 标签3: Δ = b²−4ac — 左下方 */
.hero-float-tag.t3 {
    bottom: 18%;
    left: 2%;
    animation: heroTagFadeIn 0.8s ease-out 3.0s forwards,
               heroTagFloat3 9s ease-in-out 3.8s infinite;
    color: #db2777;
}

@keyframes heroTagFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes heroTagFloat1 {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(6px, -8px); }
    66% { transform: translate(-4px, -3px); }
}
@keyframes heroTagFloat2 {
    0%, 100% { transform: translate(0, 0); }
    40% { transform: translate(-5px, 7px); }
    70% { transform: translate(3px, -4px); }
}
@keyframes heroTagFloat3 {
    0%, 100% { transform: translate(0, 0); }
    30% { transform: translate(7px, 5px); }
    60% { transform: translate(-3px, -6px); }
}

/* ========== 功能卡片区 ========== */
.features-section {
    padding: 60px 48px 100px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.cat-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.cat-tab svg {
    width: 18px;
    height: 18px;
}

.cat-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* 功能卡片网格 - 2x2布局 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
    max-width: 960px;
    margin: 0 auto;
}

.feature-card {
    position: relative;
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 32px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(226, 232, 240, 0.8);
    overflow: hidden;
    /* 保持卡片等高 */
    display: flex;
    flex-direction: column;
    min-height: 260px;
}

.feature-card p {
    flex-grow: 1;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.feature-card[data-category="teach"]::before {
    background: var(--teach-color);
}

.feature-card[data-category="learn"]::before {
    background: var(--learn-color);
}

.feature-card[data-category="eval"]::before {
    background: var(--eval-color);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: transform var(--transition-normal);
}

.card-icon svg {
    width: 28px;
    height: 28px;
}

.card-icon.teach {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(139, 92, 246, 0.05));
    color: var(--teach-color);
}

.card-icon.learn {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(6, 182, 212, 0.05));
    color: var(--learn-color);
}

.card-icon.eval {
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.15), rgba(249, 115, 22, 0.05));
    color: var(--eval-color);
}

.feature-card:hover .card-icon {
    transform: scale(1.1);
}

.card-badge {
    position: absolute;
    top: 24px;
    right: 24px;
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.card-footer {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.card-tag {
    padding: 4px 12px;
    background: var(--bg-color);
    border-radius: var(--border-radius-pill);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 卡片隐藏动画（用于分类过滤） */
.feature-card.hidden {
    display: none;
}

/* ========== Hero 页脚 ========== */
.hero-footer {
    text-align: center;
    padding: 32px 48px;
    border-top: 1px solid rgba(226, 232, 240, 0.6);
    background: rgba(255, 255, 255, 0.5);
}

.hero-footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========== 功能页面布局 ========== */
.app-page {
    min-height: 100vh;
    background: var(--bg-color);
    background-image: var(--bg-pattern);
}

/* ========== 合并式顶部导航栏（返回 + Tab + 设置 一体化） ========== */
.app-header-unified {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    height: 52px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(99, 102, 241, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.03);
    gap: 12px;
}

/* 紧凑返回按钮 */
.btn-back-compact {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-back-compact svg {
    width: 16px;
    height: 16px;
}

.btn-back-compact:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-bg);
}

/* 紧凑设置按钮 */
.btn-icon-compact {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-icon-compact svg {
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
}

.btn-icon-compact:hover {
    border-color: var(--primary-color);
    background: var(--primary-bg);
}

.btn-icon-compact:hover svg {
    color: var(--primary-color);
}

/* 内联模块Tab（居中） */
.module-tabs-inline {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.module-tabs-inline::-webkit-scrollbar {
    display: none;
}

/* 保留旧类名的兼容样式 */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 60px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(99, 102, 241, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-back svg {
    width: 18px;
    height: 18px;
}

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

.app-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.app-title h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.module-icon svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.module-badge {
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
}

.app-header-actions {
    display: flex;
    gap: 12px;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

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

.btn-icon:hover svg {
    color: var(--primary-color);
}

/* ========== 模块切换栏 - 精简胶囊式设计 ========== */
.module-tabs {
    display: flex;
    gap: 6px;
    padding: 10px 24px;
    background: linear-gradient(180deg, #fafbfc 0%, #f5f7fa 100%);
    border-bottom: 1px solid rgba(99, 102, 241, 0.06);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.module-tabs::-webkit-scrollbar {
    display: none;
}

.module-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.module-tab svg {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.module-tab:hover {
    background: rgba(99, 102, 241, 0.06);
    color: var(--text-primary);
}

.module-tab:hover svg {
    transform: scale(1.1);
}

.module-tab.active {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.25);
}

.module-tab.active svg {
    color: white;
}

/* ========== 功能内容区 ========== */
.app-content {
    padding: 16px 24px 24px;
    max-width: 1600px;
    margin: 0 auto;
    /* 防止布局偏移 - 固定宽度计算基准 */
    width: 100%;
    box-sizing: border-box;
}

.app-content .module-panel {
    display: none;
}

.app-content .module-panel.active {
    display: block;
    /* 纯淡入动画，无位移，避免布局偏移 */
    animation: panelFadeIn 0.25s ease;
}

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

/* ========== 功能亮点展示区 ========== */
.showcase-section {
    padding: 80px 48px;
    max-width: 1200px;
    margin: 0 auto;
}

.showcase-item {
    display: flex;
    align-items: center;
    gap: 60px;
    padding: 60px 0;
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.showcase-item:last-child {
    border-bottom: none;
}

.showcase-item.reverse {
    flex-direction: row-reverse;
}

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

.showcase-tag {
    display: inline-block;
    padding: 6px 14px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
    border-radius: var(--border-radius-pill);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.showcase-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.showcase-desc {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.showcase-desc strong {
    color: var(--primary-color);
    font-weight: 600;
}

.showcase-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.showcase-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.showcase-features li svg {
    width: 20px;
    height: 20px;
    color: var(--success-color);
    flex-shrink: 0;
}

.showcase-visual {
    flex: 1;
    min-width: 0;
    display: flex;
    justify-content: center;
}

/* Mockup 窗口样式 */
.showcase-mockup {
    width: 100%;
    max-width: 420px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.mockup-header {
    display: flex;
    gap: 8px;
    padding: 14px 16px;
    background: linear-gradient(to bottom, #f8fafc, #f1f5f9);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.mockup-header .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.mockup-header .dot.red { background: #ef4444; }
.mockup-header .dot.yellow { background: #f59e0b; }
.mockup-header .dot.green { background: #22c55e; }

.mockup-body {
    padding: 24px;
}

/* ===== Courseware Mockup (课堂学习展示) ===== */
.courseware-mockup .mockup-body {
    padding: 0;
}

.mock-courseware {
    display: flex;
    min-height: 280px;
}

.mock-sidebar-mini {
    width: 140px;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    border-right: 1px solid #e2e8f0;
    padding: 12px 0;
    flex-shrink: 0;
}

.mock-chapter {
    padding: 10px 14px;
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: default;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.mock-chapter.completed {
    color: var(--success-color);
}

.mock-chapter.completed svg {
    width: 14px;
    height: 14px;
    color: var(--success-color);
}

.mock-chapter.active {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    font-weight: 600;
    border-left-color: var(--primary-color);
}

.active-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-color);
    flex-shrink: 0;
    animation: activePulse 2s ease-in-out infinite;
}

@keyframes activePulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4); }
    50% { box-shadow: 0 0 0 4px rgba(37, 99, 235, 0); }
}

.mock-content-mini {
    flex: 1;
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow: hidden;
}

.mock-lesson-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    padding-bottom: 6px;
    border-bottom: 1px solid #e2e8f0;
    margin-bottom: 2px;
}

.mock-formula {
    font-family: 'Times New Roman', serif;
    font-style: italic;
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
    padding: 8px 12px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(124, 58, 237, 0.06));
    border-radius: 8px;
    text-align: center;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.mock-formula.highlight-pulse {
    animation: formulaPulse 3s ease-in-out infinite;
}

@keyframes formulaPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.1);
        border-color: rgba(37, 99, 235, 0.1);
    }
    50% {
        box-shadow: 0 0 12px 2px rgba(37, 99, 235, 0.15);
        border-color: rgba(37, 99, 235, 0.3);
    }
}

.mock-text {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

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

/* AI 对话区域 */
.mock-ai-dialog {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mock-ai-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    color: white;
    border-radius: 16px;
    font-size: 0.72rem;
    font-weight: 600;
    align-self: flex-start;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.mock-ai-btn svg {
    width: 12px;
    height: 12px;
}

/* AI 对话气泡动画（循环：淡入→停留→淡出→等待） */
.mock-ai-bubble {
    display: flex;
    align-items: flex-start;
    gap: 6px;
    opacity: 0;
    transform: translateY(8px);
    animation: bubbleCycle 8s ease-in-out infinite;
}

.mock-ai-bubble.bubble-1 {
    animation-delay: 1s;
    justify-content: flex-end;
}

.mock-ai-bubble.bubble-2 {
    animation-delay: 2.5s;
}

/* 8s 周期：0-8% 淡入(0.6s) → 8-75% 停留(5.4s) → 75-88% 淡出(1s) → 88-100% 隐藏(1s) */
@keyframes bubbleCycle {
    0%   { opacity: 0; transform: translateY(8px); }
    8%   { opacity: 1; transform: translateY(0); }
    75%  { opacity: 1; transform: translateY(0); }
    88%  { opacity: 0; transform: translateY(-4px); }
    100% { opacity: 0; transform: translateY(8px); }
}

.bubble-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0;
}

.bubble-avatar svg {
    width: 12px;
    height: 12px;
}

.mock-ai-bubble:not(.ai) .bubble-avatar {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.mock-ai-bubble.ai .bubble-avatar {
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    color: white;
}

.bubble-text {
    padding: 6px 10px;
    border-radius: 10px;
    font-size: 0.7rem;
    line-height: 1.4;
    max-width: 170px;
}

.mock-ai-bubble:not(.ai) .bubble-text {
    background: #f1f5f9;
    color: var(--text-primary);
    border-bottom-right-radius: 4px;
}

.mock-ai-bubble.ai .bubble-text {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.08));
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

/* 气泡中的打字指示器 */
.mock-ai-bubble.ai .bubble-text::after {
    content: '';
    display: inline-block;
    width: 3px;
    height: 10px;
    background: var(--primary-color);
    margin-left: 2px;
    animation: cursorBlink 1s infinite;
    vertical-align: text-bottom;
}

/* Explorer Mockup */
.explorer-mockup .mock-graph {
    background: #f8fafc;
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
}

.parabola-svg {
    width: 100%;
    height: auto;
}

.animate-draw {
    stroke-dasharray: 300;
    stroke-dashoffset: 300;
    animation: drawPath 2s ease forwards infinite;
}

@keyframes drawPath {
    0% { stroke-dashoffset: 300; }
    50% { stroke-dashoffset: 0; }
    100% { stroke-dashoffset: 0; }
}

.mock-sliders {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mock-slider {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mock-slider span {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 60px;
}

.slider-track {
    flex: 1;
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
}

.slider-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #7c3aed);
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Quiz Mockup */
.quiz-mockup .mock-question {
    margin-bottom: 20px;
}

.mock-q-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.5;
}

.mock-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mock-option {
    padding: 10px 14px;
    background: #f8fafc;
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

.mock-option.correct {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
    color: #16a34a;
    font-weight: 600;
}

.mock-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
    border-radius: 12px;
}

.mock-score {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.mock-score .score-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
}

.mock-score .score-label {
    font-size: 1rem;
    color: var(--text-secondary);
}

.mock-stats {
    display: flex;
    gap: 16px;
}

.mock-stats .stat {
    font-size: 0.9rem;
    font-weight: 600;
}

.mock-stats .stat.correct { color: #16a34a; }
.mock-stats .stat.wrong { color: #dc2626; }

/* Radar Mockup */
.radar-mockup .mockup-body {
    text-align: center;
}

.radar-svg {
    width: 100%;
    max-width: 200px;
    height: auto;
    margin-bottom: 16px;
}

.mock-diagnosis {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.diagnosis-tag {
    padding: 6px 12px;
    border-radius: var(--border-radius-pill);
    font-size: 0.8rem;
    font-weight: 600;
}

.diagnosis-tag.warning {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

.diagnosis-tag.success {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
}

/* ========== 教学评闭环示意 ========== */
.loop-section {
    padding: 80px 48px;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    text-align: center;
}

.loop-header {
    margin-bottom: 48px;
}

.loop-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.loop-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ---- 倒三角形容器 ---- */
.loop-triangle-wrapper {
    position: relative;
    width: 100%;
    max-width: 620px;
    height: 400px;
    margin: 0 auto 40px;
}

/* SVG弧线层 */
.loop-arcs {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.loop-arc-path {
    animation: arcFlow 2s linear infinite;
}

@keyframes arcFlow {
    to { stroke-dashoffset: -20; }
}

/* ---- 节点卡片 ---- */
.loop-node {
    position: absolute;
    width: 160px;
    padding: 24px 16px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.07);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    z-index: 1;
    text-align: center;
}

.loop-node:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}

/* 倒三角定位：教(左上) 学(右上) 评(下中) */
.loop-node[data-pos="top-left"] {
    top: 20px;
    left: 50px;
}
.loop-node[data-pos="top-right"] {
    top: 20px;
    right: 50px;
}
.loop-node[data-pos="bottom-center"] {
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
}
.loop-node[data-pos="bottom-center"]:hover {
    transform: translateX(-50%) translateY(-4px);
}

.loop-node .node-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

.loop-node .node-icon svg {
    width: 26px;
    height: 26px;
}

.loop-node h4 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.loop-node p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 教学评颜色 */
.teach-node { border-color: rgba(139, 92, 246, 0.3); }
.teach-node .node-icon {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(139, 92, 246, 0.05));
    color: var(--teach-color);
}
.teach-node h4 { color: var(--teach-color); }

.learn-node { border-color: rgba(6, 182, 212, 0.3); }
.learn-node .node-icon {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(6, 182, 212, 0.05));
    color: var(--learn-color);
}
.learn-node h4 { color: var(--learn-color); }

.eval-node { border-color: rgba(249, 115, 22, 0.3); }
.eval-node .node-icon {
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.15), rgba(249, 115, 22, 0.05));
    color: var(--eval-color);
}
.eval-node h4 { color: var(--eval-color); }

/* ---- 中心标签 ---- */
.loop-center-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(37, 99, 235, 0.08));
    color: #7c3aed;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 8px 20px;
    border-radius: 24px;
    border: 1px solid rgba(139, 92, 246, 0.2);
    z-index: 2;
    white-space: nowrap;
    backdrop-filter: blur(6px);
}

.loop-center-label svg {
    width: 15px;
    height: 15px;
}


/* ========== 底部CTA区域 ========== */
.cta-section {
    padding: 80px 48px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
}

.btn-cta-primary {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 18px 48px;
    background: white;
    color: var(--primary-color);
    border: none;
    border-radius: var(--border-radius-pill);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.btn-cta-primary svg {
    width: 22px;
    height: 22px;
}

.btn-cta-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.25);
}

/* ========== 功能选择页 ========== */
.select-page {
    min-height: 100vh;
    background: var(--gradient-hero);
    background-image: var(--bg-pattern);
    display: flex;
    flex-direction: column;
}

.select-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 48px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.select-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.select-logo svg {
    width: 28px;
    height: 28px;
}

.select-main {
    flex: 1;
    padding: 48px;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.select-welcome {
    text-align: center;
    margin-bottom: 40px;
}

.select-welcome h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.select-welcome p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* 功能卡片网格 */
.select-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.select-card {
    position: relative;
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 32px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(226, 232, 240, 0.8);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.select-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    transform: scaleX(1);
    transition: height var(--transition-normal);
}

.select-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.select-card:hover::before {
    height: 5px;
}

.select-card[data-module="knowledge"]::before {
    background: var(--teach-color);
}

.select-card[data-module="explorer"]::before {
    background: var(--learn-color);
}

.select-card[data-module="quiz"]::before,
.select-card[data-module="dashboard"]::before {
    background: var(--eval-color);
}

/* 卡片头部：图标+标题同行 */
.select-card .card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.select-card .card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.select-card .card-icon svg {
    width: 24px;
    height: 24px;
}

.select-card:hover .card-icon {
    transform: scale(1.1);
}

.select-card .card-badge {
    position: absolute;
    top: 24px;
    right: 24px;
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
}

.select-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 48px; /* 与图标高度一致，实现垂直居中对齐 */
}

.select-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
    flex: 1;
}

.select-card .card-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.select-card .card-tag {
    padding: 4px 12px;
    background: var(--bg-color);
    border-radius: var(--border-radius-pill);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.btn-enter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--primary-bg);
    color: var(--primary-color);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-enter svg {
    width: 18px;
    height: 18px;
}

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

/* 按钮 & 图标跟随教/学/评主题色 */
.select-card[data-module="knowledge"] .card-icon {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(139, 92, 246, 0.05));
    color: var(--teach-color);
}
.select-card[data-module="knowledge"] .btn-enter {
    background: rgba(139, 92, 246, 0.08);
    color: var(--teach-color);
    border-color: rgba(139, 92, 246, 0.2);
}
.select-card[data-module="knowledge"] .btn-enter:hover {
    background: var(--teach-color);
    color: white;
}

.select-card[data-module="explorer"] .card-icon {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(6, 182, 212, 0.05));
    color: var(--learn-color);
}
.select-card[data-module="explorer"] .btn-enter {
    background: rgba(6, 182, 212, 0.08);
    color: var(--learn-color);
    border-color: rgba(6, 182, 212, 0.2);
}
.select-card[data-module="explorer"] .btn-enter:hover {
    background: var(--learn-color);
    color: white;
}

.select-card[data-module="quiz"] .card-icon,
.select-card[data-module="dashboard"] .card-icon {
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.15), rgba(249, 115, 22, 0.05));
    color: var(--eval-color);
}
.select-card[data-module="quiz"] .btn-enter,
.select-card[data-module="dashboard"] .btn-enter {
    background: rgba(249, 115, 22, 0.08);
    color: var(--eval-color);
    border-color: rgba(249, 115, 22, 0.2);
}
.select-card[data-module="quiz"] .btn-enter:hover,
.select-card[data-module="dashboard"] .btn-enter:hover {
    background: var(--eval-color);
    color: white;
}

.select-footer {
    text-align: center;
    padding: 24px 48px;
    border-top: 1px solid rgba(226, 232, 240, 0.6);
    background: rgba(255, 255, 255, 0.5);
}

.select-footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-decoration {
        display: none;
    }
    
    .hero-main {
        justify-content: center;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-cta {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .hero-header {
        padding: 12px 24px;
    }
    
    .hero-nav {
        gap: 16px;
    }
    
    .nav-link {
        display: none;
    }
    
    .hero-main {
        padding: 120px 24px 40px;
        min-height: 60vh;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .features-section {
        padding: 40px 24px 60px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .category-tabs {
        flex-wrap: wrap;
    }
    
    .app-header {
        padding: 12px 16px;
    }
    
    .btn-back span {
        display: none;
    }
    
    .module-tabs {
        padding: 12px 16px;
    }
    
    .module-tab span {
        display: none;
    }
    
    .app-content {
        padding: 16px;
    }
    
    /* 功能亮点展示区响应式 */
    .showcase-section {
        padding: 40px 24px;
    }
    
    .showcase-item {
        flex-direction: column;
        gap: 32px;
        padding: 40px 0;
    }
    
    .showcase-item.reverse {
        flex-direction: column;
    }
    
    .showcase-title {
        font-size: 1.5rem;
    }
    
    .showcase-desc {
        font-size: 1rem;
    }
    
    .showcase-mockup {
        max-width: 100%;
    }
    
    /* 闭环示意响应式 */
    .loop-section {
        padding: 40px 16px;
    }
    
    .loop-header h2 {
        font-size: 1.75rem;
    }
    
    /* 小屏幕下改为纵向排列 */
    .loop-triangle-wrapper {
        height: auto;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 16px;
        max-width: 100%;
        padding: 0 8px;
    }
    
    .loop-arcs {
        display: none;
    }
    
    .loop-center-label {
        position: static;
        transform: none;
        margin: 8px 0;
    }
    
    .loop-node {
        position: static;
        width: 100%;
        max-width: 260px;
        transform: none !important;
    }
    
    
    /* 功能选择页响应式 */
    .select-header {
        padding: 12px 24px;
    }
    
    .select-main {
        padding: 32px 20px;
    }
    
    .select-welcome h1 {
        font-size: 1.75rem;
    }
    
    .select-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .select-card {
        padding: 24px;
    }
    
    .select-card h3 {
        font-size: 1.2rem;
    }
    
    .select-footer {
        padding: 16px 24px;
    }
    
    /* CTA区域响应式 */
    .cta-section {
        padding: 60px 24px;
    }
    
    .cta-content h2 {
        font-size: 1.75rem;
    }
    
    .cta-content p {
        font-size: 1rem;
    }
    
    .btn-cta-primary {
        padding: 16px 36px;
        font-size: 1rem;
    }
}