/* ============================================================
   记了么官网 - 子页面公共样式
   包含：功能介绍、产品截图、用户案例、联系我们、使用教程、常见问题、更新日志
   ============================================================ */

/* ========== 功能介绍页 ========== */

/* 功能详情卡片 */
.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    padding: 56px 0;
    border-bottom: 1px solid var(--color-border);
}

.feature-detail:last-child { border-bottom: none; }

.feature-detail:nth-child(even) {
    direction: rtl;
}

.feature-detail:nth-child(even) > * {
    direction: ltr;
}

.feature-detail-content h3 {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 14px;
    letter-spacing: -0.02em;
}

.feature-detail-content h3 svg {
    width: 28px;
    height: 28px;
    vertical-align: -4px;
    margin-right: 6px;
}

.feature-detail-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.feature-steps {
    list-style: none;
    margin-bottom: 20px;
}

.feature-steps li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    border-bottom: 1px dashed var(--color-border);
}

.feature-steps li:last-child { border-bottom: none; }

.step-num {
    width: 24px; height: 24px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 700;
    flex-shrink: 0; margin-top: 2px;
}

.feature-detail-img {
    position: relative;
    cursor: pointer;
    display: flex;
    justify-content: center;
}

.feature-detail-img .gallery-thumb {
    max-width: 300px;
    width: 100%;
    transition: transform var(--transition-smooth);
}

.feature-detail-img:hover .gallery-thumb { transform: scale(1.02); }

.feature-detail-img .gallery-thumb img {
    object-fit: cover;
}

/* 功能亮点标签 */
.feature-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.highlight-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 14px;
    background: var(--color-primary-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary);
}

.highlight-tag svg {
    width: 14px;
    height: 14px;
}

.highlight-tag.hot {
    background: linear-gradient(135deg, rgba(220,20,60,0.08), rgba(220,20,60,0.04));
    border-color: rgba(220,20,60,0.15);
    color: #ff7831;
}

.highlight-tag.vip {
    background: linear-gradient(135deg, rgba(212,175,55,0.12), rgba(212,175,55,0.06));
    border-color: rgba(212,175,55,0.2);
    color: #cc6027;
}

/* 功能分类导航 */
.feature-nav {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.feature-nav-btn {
    padding: 8px 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* 三步快速上手 */
.quick-start-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
}

/* 四步变体（商务合作页） */
.quick-start-steps.cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

.quick-start-item {
    text-align: center;
    padding: 36px 24px;
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    position: relative;
    transition: all var(--transition-smooth);
}

.quick-start-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.quick-start-number {
    width: 36px;
    height: 36px;
    margin: 0 auto 16px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 800;
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.3);
}

.quick-start-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    background: var(--color-primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

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

.quick-start-item h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.quick-start-item p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.quick-start-arrow {
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-border);
    z-index: 2;
}

.quick-start-arrow svg {
    width: 24px;
    height: 24px;
}

/* 往来对照三种状态 */
.exchange-status-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.exchange-status-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: all var(--transition-smooth);
    position: relative;
}

.exchange-status-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--status-color);
}

.exchange-status-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.exchange-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 16px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 700;
    background: rgba(0,0,0,0.06);
    background: color-mix(in srgb, var(--status-color) 12%, transparent);
    color: var(--status-color);
    margin: 24px 24px 0;
}

.exchange-status-desc {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin: 12px 24px 0;
}

.exchange-status-detail {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin: 8px 24px 0;
}

.exchange-status-img {
    margin: 16px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all 0.3s ease;
}

.exchange-status-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.exchange-status-img img {
    width: 100%;
    height: auto;
    display: block;
}

/* 功能对比表 */
/* ========== 定价卡片 ========== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 28px 32px;
    position: relative;
    transition: all var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

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

.pricing-card-vip {
    border-color: rgba(255, 176, 102, 0.3);
    box-shadow: 0 0 0 1px rgba(255, 176, 102, 0.1), var(--shadow-card);
    background: linear-gradient(180deg, rgba(255, 176, 102, 0.03) 0%, var(--color-bg-card) 40%);
}

.pricing-card-vip:hover {
    box-shadow: 0 0 0 1px rgba(255, 176, 102, 0.2), var(--shadow-lg);
}

.pricing-card-badge {
    position: absolute;
    top: -1px;
    right: 24px;
    background: linear-gradient(135deg, #ffa16f, #ffd7c1);
    color: white;
    padding: 6px 16px;
    border-radius: 0 0 10px 10px;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.1em;
}

.pricing-card-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.pricing-card-name {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.pricing-card-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: 8px;
}

.pricing-amount {
    font-size: 42px;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
}

.pricing-unit {
    font-size: 14px;
    color: var(--color-text-muted);
    font-weight: 400;
}

.pricing-card-vip .pricing-amount {
    background: linear-gradient(135deg, #ffa16f, #cc6027);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-card-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin: 0 0 28px;
    flex: 1;
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 14px;
    line-height: 1.4;
    border-bottom: 1px solid color-mix(in srgb, var(--color-border) 50%, transparent);
}

.pricing-feature:last-child {
    border-bottom: none;
}

.pricing-feature.included svg {
    color: #ffa16f;
    flex-shrink: 0;
}

.pricing-feature.excluded {
    opacity: 0.4;
}

.pricing-feature.excluded svg {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.pricing-feature-name {
    color: var(--color-text);
    font-weight: 500;
}

.pricing-feature-detail {
    color: var(--color-text-muted);
    font-size: 12px;
    margin-left: auto;
    white-space: nowrap;
}

.pricing-cta {
    width: 100%;
    justify-content: center;
    margin-top: auto;
}

/* 福利专区 */
.bonus-section {
    margin-top: 48px;
    padding: 32px;
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-left: auto;
    margin-right: auto;
}

.bonus-header {
    text-align: center;
    margin-bottom: 28px;
}

.bonus-title {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
}

.bonus-title svg {
    color: #ff7831;
}

.bonus-desc {
    font-size: 14px;
    color: var(--color-text-muted);
}

.bonus-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.bonus-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 20px;
    background: var(--color-bg-section);
    border-radius: var(--radius-md);
    transition: all var(--transition-smooth);
}

.bonus-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.bonus-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    color: #ff7831;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.bonus-icon svg {
    width: 22px;
    height: 22px;
}

.bonus-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.bonus-content p {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* 响应式 - 定价卡片 */
@media (max-width: 768px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .pricing-card {
        padding: 28px 20px 24px;
    }
    .pricing-amount {
        font-size: 36px;
    }
    .bonus-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .pricing-feature-detail {
        display: none;
    }
}


/* ========== 产品截图页 ========== */

/* 截图画廊 */
.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.gallery-item {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 12px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    cursor: pointer;
    transition: all var(--transition-smooth);
    overflow: hidden;
}

.gallery-item:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 
        inset 0 0 0 1px rgba(255,255,255,0.08),
        0 4px 16px rgba(0,0,0,0.2),
        0 12px 32px rgba(0,0,0,0.12);
}

/* ========== 手机壳样式 ========== */
.gallery-thumb {
    width: 100%;
    aspect-ratio: 9/19.5;
    background: #1a1a1a;
    border-radius: 28px;
    overflow: hidden;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border: 3px solid #2a2a2a;
    box-shadow: 
        inset 0 0 0 1px rgba(255,255,255,0.05),
        0 2px 8px rgba(0,0,0,0.15),
        0 8px 24px rgba(0,0,0,0.1);
    padding: 10px 5px 10px;
}

/* 手机顶部灵动岛 */
.gallery-thumb::before {
    content: '';
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 28%;
    height: 16px;
    background: #1a1a1a;
    border-radius: 10px;
    z-index: 2;
}

/* 手机底部横条指示器 */
.gallery-thumb::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 30%;
    height: 4px;
    background: rgba(255,255,255,0.3);
    border-radius: 2px;
    z-index: 2;
}

/* 手机屏幕区域 */
.gallery-thumb .phone-screen {
    width: 100%;
    height: 100%;
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.gallery-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery-item:hover .gallery-thumb img { transform: scale(1.05); }

.gallery-info {
    text-align: center;
}

.gallery-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 3px;
}

.gallery-category {
    font-size: 11px;
    color: var(--color-text-muted);
}

/* 分类筛选标签 */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 7px 18px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.gallery-item.hidden { display: none; }


/* ========== 用户案例页 ========== */

/* 案例卡片 - 精选大卡片 */
.case-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    margin-bottom: 24px;
}

.case-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.case-card.case-featured {
    padding: 0;
}

.case-featured .case-header {
    padding: 28px 32px 0;
}

.case-featured .case-body {
    padding: 0 32px 28px;
}

.case-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.case-avatar {
    width: 56px; height: 56px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 22px; font-weight: 700;
    flex-shrink: 0;
}

.case-meta h4 {
    font-size: 17px; font-weight: 700;
    color: var(--color-text); margin-bottom: 2px;
}

.case-meta p {
    font-size: 13px; color: var(--color-text-muted);
}

/* 案例标签 - 分类色彩 */
.case-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    margin-left: auto;
    white-space: nowrap;
}

.case-tag svg { width: 12px; height: 12px; }

.case-tag.tag-wedding { background: rgba(220,20,60,0.1); color: #ff7831; }
.case-tag.tag-funeral { background: rgba(107,114,128,0.1); color: #6B7280; }
.case-tag.tag-baby { background: rgba(244,114,182,0.1); color: #DB2777; }
.case-tag.tag-school { background: rgba(59,130,246,0.1); color: #ff7831; }
.case-tag.tag-house { background: rgba(16,185,129,0.1); color: #059669; }
.case-tag.tag-business { background: rgba(245,158,11,0.1); color: #D97706; }
.case-tag.tag-elder { background: rgba(139,92,246,0.1); color: #7C3AED; }

.case-content {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.85;
    margin-bottom: 22px;
}

/* 案例引用 */
.case-quote {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(var(--color-primary-rgb), 0.04);
    border-radius: var(--radius-sm);
    margin-top: 16px;
    font-size: 13px;
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.6;
}

.case-body .case-stats {
    margin-top: 20px;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding-top: 18px;
    border-top: 1px dashed var(--color-border);
}

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

.case-stat-value {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 800;
    color: var(--color-primary);
}

.case-stat-label {
    font-size: 11px;
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* ===== 分类筛选栏 ===== */
.cases-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
    padding: 16px 20px;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.filter-btn {
    padding: 8px 18px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.filter-btn svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.05);
}

.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(var(--color-primary-rgb), 0.3);
}

/* ===== 案例网格 - 迷你卡片 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.case-mini {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: 24px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.case-mini::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.case-mini:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(var(--color-primary-rgb), 0.3);
}

.case-mini:hover::before {
    opacity: 1;
}

.case-mini-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 14px;
    flex-shrink: 0;
}

.case-mini-body {
    flex: 1;
}

.case-mini-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 8px;
}

.case-mini-tag.tag-wedding { background: rgba(220,20,60,0.1); color: #ff7831; }
.case-mini-tag.tag-funeral { background: rgba(107,114,128,0.1); color: #6B7280; }
.case-mini-tag.tag-baby { background: rgba(244,114,182,0.1); color: #DB2777; }
.case-mini-tag.tag-school { background: rgba(59,130,246,0.1); color: #ff7831; }
.case-mini-tag.tag-house { background: rgba(16,185,129,0.1); color: #059669; }
.case-mini-tag.tag-business { background: rgba(245,158,11,0.1); color: #D97706; }
.case-mini-tag.tag-elder { background: rgba(139,92,246,0.1); color: #7C3AED; }

.case-mini-body h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.case-mini-body p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.case-mini-stats {
    display: flex;
    gap: 16px;
    padding-top: 14px;
    margin-top: 14px;
    border-top: 1px dashed var(--color-border);
    flex-wrap: wrap;
}

.case-mini-stats span {
    font-size: 12px;
    color: var(--color-text-muted);
}

.case-mini-stats strong {
    color: var(--color-primary);
    font-weight: 700;
}

/* 数据亮点 */
.data-highlight {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 48px;
}

.highlight-item {
    text-align: center;
    padding: 28px 16px;
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-smooth);
}

.highlight-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.highlight-value {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 900;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.highlight-label {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 6px;
}


/* ========== 联系我们页 ========== */

/* 联系方式卡片 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.contact-info {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

.contact-info-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    background: var(--color-bg-section);
    border-radius: var(--radius-md);
    transition: all var(--transition-smooth);
}

.contact-item:hover {
    transform: translateX(6px);
    background: var(--color-primary-bg);
}

.contact-icon {
    width: 46px; height: 46px;
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: white; flex-shrink: 0;
}

.contact-icon svg { width: 22px; height: 22px; }

.contact-icon.wechat { background: linear-gradient(135deg, #07C160, #06AE56); }
.contact-icon.email { background: linear-gradient(135deg, #ff7831, #ffa16f); }
.contact-icon.location { background: linear-gradient(135deg, #ff7831, #ffa16f); }
.contact-icon.time { background: linear-gradient(135deg, #ff7831, #ffa16f); }

.contact-detail h4 {
    font-size: 15px; font-weight: 700;
    color: var(--color-text); margin-bottom: 2px;
}

.contact-detail p {
    font-size: 13px; color: var(--color-text-secondary);
}

/* 二维码展示 */
.qr-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 28px;
}

.qr-card {
    text-align: center;
    padding: 24px;
    background: var(--color-bg-section);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-smooth);
}

.qr-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.qr-card-img {
    width: 140px; height: 140px;
    background: white;
    border-radius: var(--radius-sm);
    margin: 0 auto 12px;
    display: flex; align-items: center; justify-content: center;
    padding: 10px;
    border: 1px solid var(--color-border);
}

.qr-card-img img { width: 100%; height: 100%; object-fit: contain; }

.qr-card-name {
    font-size: 14px; font-weight: 600;
    color: var(--color-text);
}

.qr-card-desc {
    font-size: 12px; color: var(--color-text-muted);
    margin-top: 2px;
}

/* 反馈表单 */
.feedback-form {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

.form-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.form-subtitle {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 28px;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-smooth);
    display: flex; align-items: center; justify-content: center; gap: 8px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(var(--color-primary-rgb), 0.3);
}

.submit-btn.loading {
    opacity: 0.7;
    cursor: wait;
    transform: none;
    box-shadow: none;
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 反馈消息 */
.feedback-message {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    animation: feedbackSlideIn 0.3s ease;
}

.feedback-success {
    background: color-mix(in srgb, #ffa16f 10%, transparent);
    color: #059669;
    border: 1px solid color-mix(in srgb, #ffa16f 25%, transparent);
}

.feedback-error {
    background: color-mix(in srgb, #EF4444 10%, transparent);
    color: #DC2626;
    border: 1px solid color-mix(in srgb, #EF4444 25%, transparent);
}

/* Fallback for browsers without color-mix */
@supports not (background: color-mix(in srgb, red 50%, blue)) {
    .feedback-success {
        background: rgba(16, 185, 129, 0.1);
        border-color: rgba(16, 185, 129, 0.25);
    }
    .feedback-error {
        background: rgba(239, 68, 68, 0.1);
        border-color: rgba(239, 68, 68, 0.25);
    }
}

@keyframes feedbackSlideIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* FAQ 快速入口 */
.faq-quick {
    margin-top: 48px;
}

.faq-quick-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.faq-item {
    padding: 22px 24px;
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-smooth);
    text-align: left;
    text-decoration: none;
}

.faq-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-hover);
}

.faq-item h4 {
    font-size: 14px; font-weight: 600;
    color: var(--color-text); margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.faq-item h4 svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    color: var(--color-primary);
}

.faq-item p {
    font-size: 12px; color: var(--color-text-muted);
    line-height: 1.6;
}


/* ========== 使用教程页 ========== */

/* 流程总览 */
.tutorial-flow {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.flow-step {
    padding: 28px 16px;
    text-align: center;
    position: relative;
    transition: background 0.3s ease;
}

.flow-step:hover {
    background: rgba(var(--color-primary-rgb), 0.04);
}

.flow-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 12px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.25);
}

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

.flow-number {
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 6px;
    letter-spacing: 0.05em;
}

.flow-step h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.flow-step p {
    font-size: 12px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.flow-arrow {
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    color: var(--color-border);
}

.flow-arrow svg {
    width: 14px;
    height: 14px;
}

.tutorial-section {
    padding: 60px 0;
    border-bottom: 1px solid var(--color-border);
}

.tutorial-section:last-child {
    border-bottom: none;
}

.tutorial-nav {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tutorial-nav-btn {
    padding: 10px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

.tutorial-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    margin-bottom: 32px;
}

.tutorial-header {
    padding: 24px 32px;
    background: var(--color-bg-section);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 16px;
}

.tutorial-header-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.tutorial-header-icon svg {
    width: 24px;
    height: 24px;
}

.tutorial-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
}

.tutorial-header p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.tutorial-body {
    padding: 32px;
}

/* ===== 步骤行布局：编号 + 图文并排 ===== */
.step-row {
    display: flex;
    gap: 20px;
    margin-bottom: 28px;
    padding-bottom: 28px;
    border-bottom: 1px dashed var(--color-border);
    align-items: flex-start;
}

.step-row:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* 步骤编号 - 固定宽度，完美对齐 */
.step-number {
    width: 36px;
    height: 36px;
    min-width: 36px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 15px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
}

/* 步骤主内容区：文字 + 图 */
.step-main {
    flex: 1;
    min-width: 0;
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 24px;
    align-items: start;
}

/* 偶数行图在左 */
.step-row:nth-child(even) .step-main {
    direction: rtl;
}
.step-row:nth-child(even) .step-main > * {
    direction: ltr;
}

.step-text {
    min-width: 0;
}

.step-text h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.step-text p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.step-img {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--color-bg-section);
}

.step-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
    border-color: rgba(var(--color-primary-rgb), 0.3);
}

.step-img::after {
    content: '';
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    background: rgba(0,0,0,0.5);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.step-img:hover::after {
    opacity: 1;
}

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

/* 兼容旧的 step-image 类名（灯箱等JS可能用到） */
.step-image {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--color-bg-section);
}

.step-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 步骤内列表 */
.step-list {
    list-style: none;
    padding: 0;
    margin: 10px 0;
}

.step-list li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 5px 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.step-list li svg {
    flex-shrink: 0;
    margin-top: 3px;
}

.step-list li strong {
    color: var(--color-text);
}

/* 步骤详情标签 */
.step-detail {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.step-detail-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    background: rgba(var(--color-primary-rgb), 0.06);
    border: 1px solid rgba(var(--color-primary-rgb), 0.15);
    border-radius: 14px;
    font-size: 12px;
    color: var(--color-primary);
    font-weight: 500;
}

.step-detail-tag svg {
    width: 12px;
    height: 12px;
}

.tutorial-tip {
    display: flex;
    gap: 12px;
    padding: 16px 20px;
    background: rgba(var(--color-primary-rgb), 0.05);
    border-left: none;
    border-radius: var(--radius-sm);
    margin-top: 20px;
}

.tutorial-tip-icon {
    color: var(--color-primary);
    flex-shrink: 0;
}

.tutorial-tip p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.video-placeholder {
    background: var(--color-bg-section);
    border-radius: var(--radius-md);
    padding: 60px;
    text-align: center;
    margin-bottom: 24px;
}

.video-placeholder svg {
    width: 64px;
    height: 64px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.video-placeholder p {
    color: var(--color-text-muted);
}

/* 教程页FAQ列表（复用faq样式） */
.tutorial-faq-list {
    margin-top: 60px;
}


/* ========== 常见问题页 ========== */

.faq-category {
    margin-bottom: 48px;
}

.faq-category-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.faq-category-icon {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

/* FAQ手风琴项 - 扩展公共.faq-item样式 */
.faq-page-item {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.faq-question {
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-smooth);
}

.faq-question:hover {
    background: var(--color-bg-section);
}

.faq-question .arrow {
    transition: var(--transition-smooth);
    color: var(--color-primary);
}

.faq-page-item.active .faq-question .arrow {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-page-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.faq-answer-content ul {
    margin: 12px 0;
    padding-left: 20px;
}

.faq-answer-content li {
    margin-bottom: 8px;
}

.faq-answer-content strong {
    color: var(--color-text);
}

.faq-search-box {
    max-width: 600px;
    margin: 0 auto 48px;
    position: relative;
}

.faq-search-input {
    width: 100%;
    padding: 16px 24px;
    padding-left: 52px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 16px;
    color: var(--color-text);
    transition: var(--transition-smooth);
}

.faq-search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.faq-search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

.faq-contact-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-card);
    text-align: center;
}

.faq-contact-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.faq-contact-card p {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}


/* ========== 更新日志页 ========== */

.changelog-timeline {
    position: relative;
    padding-left: 32px;
}

.changelog-timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.changelog-item {
    position: relative;
    margin-bottom: 48px;
}

.changelog-item::before {
    content: '';
    position: absolute;
    left: -32px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-primary);
}

.changelog-date {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.changelog-version {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.version-tag {
    padding: 4px 12px;
    background: var(--color-primary);
    color: white;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
}

.version-tag.new {
    background: #ffa16f;
}

.version-tag.fix {
    background: #ff7831;
}

.changelog-card {
    /* 页面背景为极浅橙白（#fffaf7），卡片头为浅橙（#fff4ec），
       两者色差过小会让卡片与页面「融」在一起；
       这里补一层描边 + 更清晰的投影，明确卡片边界与层次。 */
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 120, 49, 0.16);
    box-shadow: 0 4px 20px rgba(255, 120, 49, 0.08), 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.changelog-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(255, 120, 49, 0.14), 0 2px 6px rgba(0, 0, 0, 0.05);
}

.changelog-card-header {
    padding: 20px 24px;
    background: var(--color-bg-section);
    border-bottom: 1px solid var(--color-border);
}

.changelog-card-header h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
}

.changelog-card-body {
    padding: 24px;
}

.changelog-section {
    margin-bottom: 24px;
}

.changelog-section:last-child {
    margin-bottom: 0;
}

.changelog-section-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.changelog-section-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
}

.changelog-section-icon.new { background: #ffa16f; }
.changelog-section-icon.improve { background: #ffa16f; }
.changelog-section-icon.fix { background: #ff7831; }

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

.changelog-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.changelog-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.changelog-more {
    text-align: center;
    padding: 24px;
    border-top: 1px solid var(--color-border);
}

.changelog-filter-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 0 0 48px;
    flex-wrap: wrap;
}

.changelog-filter-tab {
    padding: 10px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.changelog-filter-tab:hover,
.changelog-filter-tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.changelog-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.changelog-stat-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow-card);
}

.changelog-stat-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin: 0 auto 16px;
}

.changelog-stat-value {
    font-size: 32px;
    font-weight: 900;
    color: var(--color-primary);
    font-family: var(--font-display);
}

.changelog-stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 8px;
}

/* 版本徽章 */
.version-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.version-badge.latest {
    background: linear-gradient(135deg, #ff7831, #ffa16f);
    color: white;
    animation: badge-pulse 2s infinite;
}

.version-badge.milestone {
    background: linear-gradient(135deg, #ff7831, #ffa16f);
    color: white;
}

@keyframes badge-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* 更新日志卡片头部描述 */
.changelog-card-header p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 6px;
    line-height: 1.6;
}

/* 更新日志列表加粗 */
.changelog-list li strong {
    color: var(--color-text);
}

/* ===== 未来规划 ===== */
.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.roadmap-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: 28px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.roadmap-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.roadmap-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(var(--color-primary-rgb), 0.3);
}

.roadmap-card:hover::before {
    opacity: 1;
}

.roadmap-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.roadmap-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.roadmap-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 14px;
}

.roadmap-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.roadmap-status.developing {
    background: rgba(16,185,129,0.1);
    color: #059669;
}

.roadmap-status.planning {
    background: rgba(139,92,246,0.1);
    color: #7C3AED;
}


/* ========== 子页面响应式 ========== */

@media (max-width: 1024px) {
    .screenshot-gallery { grid-template-columns: repeat(3, 1fr); }
    .data-highlight { grid-template-columns: repeat(2, 1fr); }
    .changelog-stats-grid { grid-template-columns: repeat(2, 1fr); }

    /* 功能介绍页 */
    .quick-start-steps.cols-4 { grid-template-columns: repeat(2, 1fr); }
    .exchange-status-grid { grid-template-columns: repeat(2, 1fr); }
    .exchange-status-grid .exchange-status-card:last-child { grid-column: 1 / -1; max-width: 400px; margin: 0 auto; }

    /* 教程流程总览 */
    .tutorial-flow { grid-template-columns: repeat(4, 1fr); }
    .flow-step:nth-child(4) .flow-arrow,
    .flow-step:nth-child(7) .flow-arrow { display: none; }
    .flow-step:nth-child(5) { grid-column: 1; }
    .flow-step:nth-child(6) { grid-column: 2; }
    .flow-step:nth-child(7) { grid-column: 3; }
}

@media (max-width: 768px) {
    .feature-detail {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 36px 0;
    }

    .feature-detail:nth-child(even) { direction: ltr; }
    .feature-detail-content h3 { font-size: 22px; }

    .screenshot-gallery { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .gallery-item { padding: 9px; }
    /* 移动端截图手机壳缩小 */
    .gallery-thumb {
        border-radius: 22px;
        border-width: 2px;
        padding: 8px 4px;
    }
    .gallery-thumb::before { height: 13px; top: 6px; width: 26%; }
    .gallery-thumb::after { bottom: 4px; width: 26%; height: 3px; }
    .gallery-thumb .phone-screen { border-radius: 16px; }

    .case-card { padding: 24px; }
    .case-featured .case-header { padding: 20px 24px 0; }
    .case-featured .case-body { padding: 0 24px 20px; }
    .case-header { flex-wrap: wrap; gap: 12px; }
    .case-tag { margin-left: 0; }
    .case-stats { grid-template-columns: repeat(3, 1fr); }
    .cases-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .case-mini { padding: 18px; }
    .cases-filter { padding: 12px 16px; gap: 6px; }
    .filter-btn { padding: 6px 14px; font-size: 12px; }
    .data-highlight { grid-template-columns: 1fr 1fr; gap: 14px; }
    .highlight-value { font-size: 26px; }

    .contact-grid { grid-template-columns: 1fr; }
    .qr-showcase { grid-template-columns: 1fr; }
    .faq-quick-grid { grid-template-columns: 1fr; }
    .contact-info, .feedback-form { padding: 24px; }

    /* 使用教程页 */
    .tutorial-header { padding: 20px; }
    .tutorial-body { padding: 20px; }
    .step-row {
        flex-direction: column;
        gap: 14px;
    }
    .step-main {
        grid-template-columns: 1fr;
        direction: ltr !important;
    }
    .step-main > * {
        direction: ltr;
    }
    .step-img {
        order: -1;
        max-width: 320px;
    }
    .tutorial-flow { grid-template-columns: repeat(2, 1fr); }
    .flow-arrow { display: none; }
    .flow-step { padding: 20px 12px; }
    .flow-icon { width: 40px; height: 40px; }
    .flow-icon svg { width: 20px; height: 20px; }
    .flow-step h4 { font-size: 13px; }
    .flow-step p { font-size: 11px; }
    .step-detail-tag { font-size: 11px; padding: 3px 10px; }

    /* 常见问题页 */
    .faq-category-title { font-size: 20px; }
    .faq-question { padding: 16px 20px; font-size: 15px; }

    /* 更新日志页 */
    .changelog-stats-grid { grid-template-columns: 1fr 1fr; }
    .changelog-timeline { padding-left: 24px; }
    .changelog-item::before { left: -24px; }
    .roadmap-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .roadmap-card { padding: 20px; }

    /* 功能介绍页 */
    .quick-start-steps { grid-template-columns: 1fr; gap: 20px; }
    .quick-start-steps.cols-4 { grid-template-columns: 1fr; }
    .quick-start-arrow { display: none; }
    .exchange-status-grid { grid-template-columns: 1fr; }
    .exchange-status-grid .exchange-status-card:last-child { max-width: 100%; }
}

@media (max-width: 480px) {
    .cases-grid { grid-template-columns: 1fr; }
    .case-mini-icon { width: 38px; height: 38px; }
    .case-mini-icon svg { width: 18px; height: 18px; }
    .case-quote { font-size: 12px; padding: 10px 14px; }
    .case-avatar { width: 46px; height: 46px; font-size: 18px; }
    .case-stat-value { font-size: 17px; }

    /* 超小屏截图保持两列 */
    .screenshot-gallery { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .gallery-item { padding: 8px; }
    .gallery-thumb {
        border-radius: 20px;
        border-width: 2px;
        padding: 7px 3px;
    }
    .gallery-thumb::before { height: 12px; top: 5px; width: 24%; border-radius: 8px; }
    .gallery-thumb::after { bottom: 4px; width: 24%; height: 3px; }
    .gallery-thumb .phone-screen { border-radius: 14px; }
    .gallery-name { font-size: 12px; }

    /* 教程页 */
    .tutorial-flow { grid-template-columns: 1fr 1fr; }
    .flow-step { padding: 14px 8px; }
    .flow-icon { width: 34px; height: 34px; }
    .flow-icon svg { width: 16px; height: 16px; }
    .flow-step h4 { font-size: 12px; }
    .step-image { max-width: 100%; }
    .step-number { width: 28px; height: 28px; font-size: 13px; }
    .roadmap-grid { grid-template-columns: 1fr; }

    /* 功能介绍页 */
    .quick-start-item { padding: 24px 16px; }
    .quick-start-icon { width: 44px; height: 44px; }
    .quick-start-icon svg { width: 22px; height: 22px; }
    .quick-start-item h4 { font-size: 16px; }
}