/* pricing.css 迁移
   Pricing page scoped styles moved from global tailwind.css.
   Keep this file visual-neutral: /pricing loads it explicitly, public pages do not.
*/

/* ===== 移动端文本样式优?===== *//* ===== 超小屏幕文本样式 ===== *//* ==================== pricing.css 迁移 ==================== */
/* ===== 按月/按年切换器样?===== */
.billing-toggle {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
}
.billing-switch {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    user-select: none;
}
.billing-option {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all 0.3s ease;
}
.billing-switch input[type="checkbox"] {
    display: none;
}
.slider {
    width: 50px;
    height: 28px;
    background: #e0e0e0;
    border-radius: 14px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}
.slider::before {
    content: "";
    position: absolute;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
.billing-switch input:checked ~ .slider {
    background: #635BFF;
}
.billing-switch input:checked ~ .slider::before {
    transform: translateX(22px);
}
.billing-switch input:checked ~ #yearly-label {
    color: #635BFF;
    font-weight: 600;
}
.billing-switch input:not(:checked) ~ #monthly-label {
    color: var(--color-dark);
    font-weight: 600;
}
.save-badge {
    display: inline-block;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-left: 6px;
    box-shadow: 0 2px 4px rgba(255, 165, 0, 0.3);
}
/* ===== 数字滚动动画样式 ===== */
.price-transition {
    display: inline-block;
    min-width: 80px;
    text-align: center;
    font-weight: 800;
}
.price-card-price .monthly-price,
.price-card-price .yearly-price {
    transition: opacity 0.3s ease, transform 0.3s ease;
}
/* 年付总价的淡入淡出效?*/
.yearly-total {
    transition: opacity 0.3s ease, max-height 0.3s ease;
    overflow: hidden;
}
.yearly-total:not([style*="display: none"]) {
    animation: slideDownExpand 0.3s ease;
}
@keyframes slideDownExpand {
    from {
        opacity: 0;
        max-height: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        max-height: 50px;
        transform: translateY(0);
    }
}
/* ===== iOS风格分段控制?===== */
.ios-segmented-control {
    margin-bottom: 32px;
    padding: 0 16px;
    display: flex;
    justify-content: center;
}
.ios-segment-track {
    position: relative;
    display: flex;
    background: rgba(118, 118, 128, 0.12);
    border-radius: 10px;
    padding: 2px;
    max-width: 500px;
    width: 100%;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}
.ios-segment-item {
    flex: 1;
    position: relative;
    z-index: 2;
    background: transparent;
    border: none;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    color: rgba(60, 60, 67, 0.6);
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    transition: all 0.2s ease-out;
    transform: scale(1);
}
.ios-segment-item:hover {
    color: rgba(60, 60, 67, 0.8);
    transform: scale(1.02);
}
.ios-segment-item:active {
    transform: scale(0.98);
    transition: all 0.1s ease-out;
}
.ios-segment-item.active {
    color: #000000;
    font-weight: 600;
    transform: scale(1);
}
.ios-segment-item.active:hover {
    transform: scale(1);
}
.ios-segment-text {
    position: relative;
    z-index: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.ios-segment-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    height: calc(100% - 4px);
    width: calc(50% - 2px);
    background: var(--color-secondary);
    border-radius: var(--radius-lg);
    z-index: 1;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform: translateX(0);
}
/* 滑块动画效果 */
.ios-segment-slider.animating {
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
/* 滑块悬停效果 */
.ios-segment-track:hover .ios-segment-slider {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), 0 1px 3px rgba(0, 0, 0, 0.3);
}
/* ===== 页面布局 ===== */
.tab-content-wrapper {
    padding: 0;
    min-height: 600px;
    position: relative;
    overflow: visible;
}
.tab-pane {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease-out;
}
.tab-pane.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}
.tab-pane.fade-in {
    animation: fadeUp 0.4s ease-out forwards;
}
.pricing-section {
    margin-bottom: 60px;
    padding: 0;
    background: transparent;
    position: relative;
    overflow: hidden;
}
.pricing-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(45deg, transparent 40%, rgba(255, 215, 0, 0.1) 50%, transparent 60%);
    z-index: 0;
}
.pricing-section-inner {
    background: var(--color-secondary);
    border-radius: 20px;
    padding: 35px 30px;
    position: relative;
    z-index: 1;
    border: 2px solid transparent;
    background-clip: padding-box;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}
.pricing-section:nth-child(1) .pricing-section-inner {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-background-tertiary) 100%);
    border-image: linear-gradient(135deg, #d1d5db, #9ca3af) 1;
}
.pricing-section:nth-child(2) .pricing-section-inner {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-background-tertiary) 100%);
    border-image: linear-gradient(135deg, #d1d5db, #9ca3af) 1;
}
.pricing-section:nth-child(3) .pricing-section-inner {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-background-tertiary) 100%);
    border-image: linear-gradient(135deg, #d1d5db, #9ca3af) 1;
}
.section-title {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
    font-size: var(--font-size-xl);
    font-weight: 700;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.section-title > span {
    display: inline-block;
    position: relative;
}
.section-title i {
    position: absolute;
    right: 100%;
    margin-right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-lg);
    opacity: 0.8;
}
/* ===== Choose Your Plan 特殊样式 ===== */
.section-title.choose-your-plan {
    font-family: 'Cinzel', serif;
    font-size: var(--font-size-2xl);
    font-weight: 600;
    letter-spacing: 2px;
    position: relative;
}
.section-title.choose-your-plan .choose-your-plan-text {
    background: linear-gradient(135deg, #000000, #374151, #111827);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}
.section-title.choose-your-plan::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #d1d5db, #9ca3af);
    border-radius: 2px;
    box-shadow: 0 2px 8px rgba(209, 213, 219, 0.4);
}
/* ===== StarCoin 特殊样式 ===== */
.starcoin-title {
    font-family: 'Orbitron', monospace;
    font-weight: 700;
    background: linear-gradient(135deg, #FFD700, #FFA500, #FF6B35);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(255, 215, 0, 0.3);
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
    font-size: 0.5em;
    margin-left: 8px;
}
.starcoin-title::before {
    content: '★';
    position: absolute;
    left: -25px;
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-lg);
    animation: pricing-starGlow 2s ease-in-out infinite alternate;
}
@keyframes pricing-starGlow {
    0% {
        text-shadow: 0 0 5px #FFD700, 0 0 10px #FFD700, 0 0 15px #FFD700;
        transform: translateY(-50%) scale(1);
    }
    100% {
        text-shadow: 0 0 10px #FFD700, 0 0 20px #FFD700, 0 0 30px #FFD700;
        transform: translateY(-50%) scale(1.1);
    }
}
/* ===== 价格卡片样式 ===== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}
/* ===== 移动端滑动容器样?===== */
.mobile-swipe-container {
    position: relative;
    overflow: hidden;
    width: 100%;
    display: none;
}
.mobile-swipe-wrapper {
    display: flex;
    transition: transform 0.3s ease-out;
    width: 100%;
}
.mobile-swipe-slide {
    flex: 0 0 100%;
    padding: 0 10px;
    box-sizing: border-box;
}
.mobile-swipe-indicators {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    padding: 0 20px;
}
.mobile-swipe-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
}
.mobile-swipe-dot.active {
    background: #000000;
    transform: scale(1.2);
}
.mobile-swipe-dot:hover {
    background: rgba(0, 0, 0, 0.6);
}
.mobile-swipe-hint {
    text-align: center;
    margin-top: 15px;
    padding: 8px 20px;
    font-size: 13px;
    color: var(--color-text-secondary);
    background: rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 500;
    letter-spacing: 0.5px;
}
.mobile-swipe-hint i {
    font-size: var(--font-size-xs);
    color: #999;
    animation: pricing-swipeHint 2s ease-in-out infinite;
}
.mobile-swipe-hint i.fa-hand-point-left {
    animation-delay: 0s;
}
.mobile-swipe-hint i.fa-hand-point-right {
    animation-delay: 1s;
}
@keyframes pricing-swipeHint {
    0%, 50%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    25% {
        opacity: 1;
        transform: scale(1.1);
    }
}
.price-card {
    background: #ffffff !important;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease-out;
    transform: translateY(0);
    opacity: 1;
}
@media (hover: hover) {
    .price-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        border-color: #d1d5db;
    }
}
.price-card.popular {
    border: 2px solid #10b981;
}
.price-card.monthly-card {
    border: 2px solid #3b82f6;
}
.price-card-header {
    text-align: left;
    margin-bottom: 20px;
}
.price-card-title {
    color: #111827;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0 0 12px 0;
}
.price-card-price {
    color: #111827;
    font-size: 32px;
    font-weight: 500;
    margin: 0;
    font-family: var(--font-family-base);
    letter-spacing: -0.5px;
    line-height: 1.2;
    display: flex;
    align-items: baseline;
    gap: 2px;
    position: relative;
    transition: all 0.3s ease;
}
.price-card-price small {
    color: #6b7280;
    font-size: 13px;
    font-weight: 400;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    letter-spacing: normal;
}
.unit-price {
    color: #6b7280;
    font-size: var(--font-size-sm);
    margin-top: 8px;
}
.price-card-body {
    flex: 1;
}
.price-card-features {
    list-style: none;
    padding: 0;
    margin: 0;
}
.price-card-features li {
    color: #374151;
    font-size: var(--font-size-sm);
    margin: 12px 0;
    display: flex;
    align-items: flex-start;
}
.price-card-features li i {
    color: #000000;
    margin-right: 8px;
    font-size: var(--font-size-xs);
    flex-shrink: 0;
    margin-top: 3px;
}
/* 子说明样?- 没有勾选图标，更浅的灰?*/
.price-card-features li.sub-description {
    color: #9ca3af;
    font-size: var(--font-size-xs);
    margin: -8px 0 12px 20px;
    display: flex;
    align-items: flex-start;
    line-height: 1.3;
    font-weight: 400;
}
.price-card-features li.sub-description::before {
    content: "";
    margin-right: 8px;
    font-size: var(--font-size-xs);
    flex-shrink: 0;
    margin-top: 3px;
}
.price-card-footer {
    margin: 20px 0;
}
.price-card-btn {
    background: transparent;
    border: 2px solid #000000;
    border-radius: var(--radius-lg);
    color: #000000;
    font-weight: 600;
    font-size: var(--font-size-sm);
    padding: 12px 24px;
    width: 100%;
    cursor: pointer;
    transition: all 0.3s ease-out;
    position: relative;
    overflow: hidden;
    transform: scale(1);
}
.price-card-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease-out;
}
@media (hover: hover) {
    .price-card-btn:hover {
        background: #000000;
        color: white;
        transform: scale(1.02);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }
    .price-card-btn:hover::before {
        left: 100%;
    }
    .price-card-btn:active {
        transform: scale(0.98);
        transition: all 0.1s ease-out;
    }
}
.price-card-btn:disabled {
    background: transparent;
    border-color: #9ca3af;
    color: #9ca3af;
    cursor: not-allowed;
    opacity: 0.7;
}
.price-card-btn:disabled:hover {
    background: transparent;
    color: #9ca3af;
}
/* 当前套餐按钮样式 */
.price-card-btn.current-plan {
    background: #6b7280 !important;
    border-color: #6b7280 !important;
    color: white !important;
    cursor: not-allowed;
    opacity: 0.8;
}
.price-card-btn.current-plan:hover {
    background: #6b7280 !important;
    color: white !important;
    transform: none !important;
    box-shadow: none !important;
}
/* 订阅到期提示样式 */
.subscription-expiry {
    margin-top: 8px;
    padding: 6px 12px;
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    color: #d4a017;
    text-align: center;
    font-weight: 500;
}
.price-card.popular .price-card-btn {
    background: transparent;
    border: 2px solid #000000;
    color: #000000;
}
@media (hover: hover) {
    .price-card.popular .price-card-btn:hover {
        background: #000000;
        color: white;
    }
}
/* ===== 星币兑换按钮悬停 ===== */
.starcoin-exchange-btn {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
@media (hover: hover) {
    .starcoin-exchange-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(255, 87, 34, 0.5);
    }
}
/* ===== 人工课业样式 ===== */
.tutoring-section {
    padding: 2rem;
    min-height: 500px;
    background: var(--color-secondary);
    position: relative;
    z-index: 1;
}
/* 确保人工课业标签页内容可?*/
#tutoring-content {
    position: relative;
    z-index: 1;
}
#tutoring-content.active {
    display: block !important;
    opacity: 1 !important;
    transform: translateY(0) !important;
}
.tutoring-intro {
    text-align: center;
    margin-bottom: 3rem;
}
.tutoring-stats-premium {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    padding: 0 1rem;
}
.tutoring-stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-background-tertiary) 100%);
    border: 2px solid transparent;
    border-radius: var(--radius-2xl);
    padding: 20px 24px;
    min-width: 140px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.tutoring-stat-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1) 0%, rgba(255, 107, 53, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}
.tutoring-stat-item:hover::before {
    opacity: 1;
}
.tutoring-stat-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    border-color: rgba(255, 215, 0, 0.3);
}
.tutoring-stat-item i {
    color: #FFD700;
    font-size: 2rem;
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
    animation: pricing-tutoringIconGlow 3s ease-in-out infinite alternate;
}
@keyframes pricing-tutoringIconGlow {
    0% {
        text-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
    }
    100% {
        text-shadow: 0 4px 16px rgba(255, 215, 0, 0.5), 0 0 20px rgba(255, 215, 0, 0.2);
    }
}
.tutoring-stat-item span {
    position: relative;
    z-index: 1;
    text-align: center;
    line-height: 1.4;
    font-weight: 600;
    color: #374151;
    letter-spacing: 0.5px;
}
.tutoring-stat-item strong {
    background: linear-gradient(135deg, #000000, #374151, #111827);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: block;
    margin-bottom: 4px;
}
.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}
.service-card {
    background: var(--color-background-tertiary);
    border: 1px solid #e9ecef;
    border-radius: var(--radius-xl);
    padding: 2rem;
    text-align: center;
}
.service-icon {
    width: 60px;
    height: 60px;
    background: var(--color-background-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: var(--color-dark);
}
.service-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-dark);
}
.service-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}
.service-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}
.service-card ul li {
    padding: 0.5rem 0;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.service-card ul li i {
    color: #000000;
    font-size: 0.8rem;
}
/* ===== 联系方式样式 ===== */
.contact-section {
    background: var(--color-background-tertiary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-top: 3rem;
}
.contact-section h3 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--color-dark);
}
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}
.advantage-item {
    text-align: center;
}
.advantage-item i {
    font-size: 2rem;
    color: var(--color-dark);
    margin-bottom: 1rem;
}
.advantage-item h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-dark);
}
.advantage-item p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}
.contact-box {
    text-align: center;
    background: white;
    border: 1px solid #e9ecef;
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}
.contact-qr {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}
.contact-box p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}
.contact-btn {
    background: var(--color-background-tertiary);
    color: var(--color-dark);
    border: 1px solid #dee2e6;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.contact-btn:hover {
    background: var(--color-dark);
    color: white;
}
/* ===== 常见问题样式 ===== */
.faq-accordion {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.faq-item:hover {
    border-color: #3b82f6;
}
.faq-question {
    width: 100%;
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.faq-question:hover {
    background-color: var(--color-background-tertiary);
}
.faq-question i {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}
.faq-question.active i {
    transform: rotate(180deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.faq-answer.show {
    max-height: 300px;
}
.faq-answer p {
    padding: 0 1.5rem 1rem;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0;
}
/* ===== 客户评价样式 ===== */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.testimonial-card {
    background: var(--color-background-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
}
.testimonial-rating {
    color: #ffc107;
    margin-bottom: 1rem;
}
.testimonial-rating i {
    font-size: 0.9rem;
}
.testimonial-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    font-style: italic;
}
.testimonial-author {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: auto;
}
.testimonial-author i {
    font-size: 2rem;
    color: #e0e0e0;
}
.testimonial-author strong {
    display: block;
    font-size: 0.9rem;
    color: var(--color-dark);
    margin-bottom: 0.2rem;
}
.testimonial-author span {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}
/* ===== Pricing Dark Mode ===== */
/* --- Price cards --- */
html.dark .price-card {
    background: #1e1e1e !important;
    border-color: #2a2a2a;
}
@media (hover: hover) {
    html.dark .price-card:hover {
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
        border-color: #404040;
    }
}
html.dark .price-card.popular {
    border-color: #10b981;
}
html.dark .price-card.monthly-card {
    border-color: #3b82f6;
}
html.dark .price-card-title {
    color: #f5f5f5;
}
html.dark .price-card-price {
    color: #f5f5f5;
}
html.dark .price-card-price small {
    color: #a3a3a3;
}
html.dark .unit-price {
    color: #a3a3a3;
}
html.dark .price-card-features li {
    color: #d4d4d4;
}
html.dark .price-card-features li i {
    color: #f5f5f5;
}
html.dark .price-card-features li.sub-description {
    color: #737373;
}
/* --- Price card buttons --- */
html.dark .price-card-btn {
    border-color: #d4d4d4;
    color: #d4d4d4;
}
@media (hover: hover) {
    html.dark .price-card-btn:hover {
        background: #f5f5f5;
        color: #171717;
        border-color: #f5f5f5;
        box-shadow: 0 4px 15px rgba(255, 255, 255, 0.1);
    }
}
html.dark .price-card-btn:disabled {
    border-color: #525252;
    color: #525252;
}
html.dark .price-card-btn:disabled:hover {
    background: transparent;
    color: #525252;
}
html.dark .price-card-btn.current-plan {
    background: #525252 !important;
    border-color: #525252 !important;
}
html.dark .price-card.popular .price-card-btn {
    border-color: #d4d4d4;
    color: #d4d4d4;
}
@media (hover: hover) {
    html.dark .price-card.popular .price-card-btn:hover {
        background: #f5f5f5;
        color: #171717;
        border-color: #f5f5f5;
    }
}
/* --- Section title --- */
html.dark .section-title {
    color: #f5f5f5;
}
html.dark .section-title.choose-your-plan .choose-your-plan-text {
    background: linear-gradient(135deg, #f5f5f5, #d4d4d4, #e5e5e5);
    -webkit-background-clip: text;
    background-clip: text;
}
html.dark .section-title.choose-your-plan::after {
    background: linear-gradient(90deg, #525252, #404040);
    box-shadow: 0 2px 8px rgba(82, 82, 82, 0.3);
}
/* --- Pricing section inner --- */
html.dark .pricing-section-inner {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}
html.dark .pricing-section:nth-child(1) .pricing-section-inner,
html.dark .pricing-section:nth-child(2) .pricing-section-inner,
html.dark .pricing-section:nth-child(3) .pricing-section-inner {
    border-image: linear-gradient(135deg, #404040, #525252) 1;
}
html.dark .pricing-section::before {
    background: linear-gradient(45deg, transparent 40%, rgba(255, 215, 0, 0.04) 50%, transparent 60%);
}
/* --- Billing toggle --- */
html.dark .slider {
    background: #404040;
}
html.dark .slider::before {
    background: #d4d4d4;
}
/* --- iOS segmented control --- */
html.dark .ios-segment-track {
    background: rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}
html.dark .ios-segment-item {
    color: rgba(255, 255, 255, 0.45);
}
html.dark .ios-segment-item:hover {
    color: rgba(255, 255, 255, 0.65);
}
html.dark .ios-segment-item.active {
    color: #f5f5f5;
}
html.dark .ios-segment-slider {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.4);
}
html.dark .ios-segment-track:hover .ios-segment-slider {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.5);
}
/* --- Mobile swipe --- */
html.dark .mobile-swipe-dot {
    background: rgba(255, 255, 255, 0.25);
}
html.dark .mobile-swipe-dot.active {
    background: #f5f5f5;
}
html.dark .mobile-swipe-dot:hover {
    background: rgba(255, 255, 255, 0.5);
}
html.dark .mobile-swipe-hint {
    background: rgba(255, 255, 255, 0.05);
}
/* --- FAQ --- */
html.dark .faq-item {
    border-color: #2a2a2a;
}
html.dark .faq-item:hover {
    border-color: #3b82f6;
}
/* --- Testimonials --- */
html.dark .testimonial-author i {
    color: #404040;
}
/* --- Service / tutoring --- */
html.dark .service-card {
    border-color: #2a2a2a;
}
html.dark .service-card ul li i {
    color: #f5f5f5;
}
html.dark .tutoring-stat-item span {
    color: #d4d4d4;
}
html.dark .tutoring-stat-item strong {
    background: linear-gradient(135deg, #f5f5f5, #d4d4d4, #e5e5e5);
    -webkit-background-clip: text;
    background-clip: text;
}
html.dark .tutoring-stat-item:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}
html.dark .contact-box {
    background: #1e1e1e;
    border-color: #2a2a2a;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}
html.dark .contact-btn {
    border-color: #404040;
}
/* --- Subscription expiry --- */
html.dark .subscription-expiry {
    background: rgba(255, 215, 0, 0.06);
    border-color: rgba(255, 215, 0, 0.2);
    color: #e5b800;
}
/* ===== 响应式设?===== */
@media (max-width: 992px) {
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    .pricing-section {
        margin-bottom: 40px;
    }
    .pricing-section-inner {
        padding: 25px 20px;
    }
    .section-title {
        font-size: var(--font-size-lg);
        letter-spacing: 0.5px;
    }
    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
/* ==========================================
   @media (max-width: 360px) - 合并的超小屏幕响应式样式
   ========================================== */
@media (max-width: 360px) {
    .auth-container.change-password {
        padding: 0.25rem;
        max-height: calc(100vh - 0.5rem);
    }
    .auth-container.change-password .auth-header {
        padding: 0.875rem 0.875rem 0.625rem;
    }
    .auth-container.change-password .auth-form {
        padding: 0.875rem;
        gap: 0.75rem;
    }
    .auth-container.change-password .form-group input {
        padding: 0.625rem 0.625rem 0.625rem 1.875rem;
    }
    .auth-container.change-password .form-group .icon {
        left: 0.625rem;
        top: 0.625rem;
    }
    .auth-container.change-password .pwd-toggle {
        right: 0.625rem;
        width: 30px;
        height: 30px;
    }
    .auth-container.change-password .submit-btn {
        padding: 0.625rem;
        min-height: 40px;
    }
    .auth-container.change-password .auth-footer {
        padding: 0.625rem 0.875rem;
    }
    .citation-header-card {
        padding: 12px 10px;
        margin-top: -16px;
        margin-bottom: 10px;
        margin-left: 0;
        margin-right: 0;
        border-radius: 14px;
    }
    .citation-header-content {
        gap: 10px;
    }
    .citation-header-icon {
        width: 38px;
        height: 38px;
        min-width: 38px;
        min-height: 38px;
        aspect-ratio: 1 / 1;
        font-size: 1rem;
        border-radius: 10px;
    }
    .citation-header-title {
        font-size: 0.9375rem;
        font-weight: 600;
        line-height: 1.35;
        margin-bottom: 3px;
    }
    .citation-header-description {
        font-size: 0.75rem;
        line-height: 1.45;
        -webkit-line-clamp: 2;
        line-clamp: 2;
    }
    .new-card {
        margin: 0.125rem 0 !important;
        padding: 0.375rem !important;
        border-radius: 10px;
    }
    .new-card-content {
        padding: 0.375rem !important;
    }
    /* convert-btn 样式已统一到 rights-info-card.css */
    .report-showcase-card {
        /* 在超小屏幕简化显示而不是隐藏 */
        margin: 0.25rem 0 !important;
    }
    .report-showcase-header {
        padding: 0.75rem;
    }
    .showcase-title h3 {
        font-size: 0.9rem;
    }
    .overview-image-container {
        min-height: 240px;
        max-height: 50vh;
    }
    /* 图片加载失败时的备用内容优化 */
    .image-error-fallback {
        padding: 0.75rem;
    }
    .image-error-fallback .error-icon {
        font-size: 2.5rem;
    }
    .image-error-fallback .error-content h4 {
        font-size: 1rem;
    }
    .image-error-fallback .error-content p {
        font-size: 0.8rem;
    }
}
/* ==========================================
   @media (hover: none) and (pointer: coarse) - 合并的触摸设备优化样式
   ========================================== */
@media (hover: none) and (pointer: coarse) {
    .new-card {
        -webkit-tap-highlight-color: transparent;
    }
    .new-card:active {
        transform: none !important;
        transition: none !important;
    }
    .pdf-btn:hover:not(:disabled),
    .pdf-quick-btn:hover,
    .mobile-tab-item:hover {
        transform: none;
    }
    .pdf-btn:active:not(:disabled),
    .pdf-quick-btn:active,
    .mobile-tab-item:active {
        opacity: 0.7;
        transform: scale(0.98);
    }
    .history-docs-table tbody tr:active {
        background: var(--color-border);
    }
    button,
    .pdf-btn,
    .pdf-quick-btn,
    .selection-action-btn,
    .ai-model-item,
    .language-item {
        min-height: 44px;
    }
    .citation-header-card {
        -webkit-tap-highlight-color: transparent;
    }
    /* 增加按钮和可点击区域的大小 */
    .tutor-modal-close {
        width: 44px;
        height: 44px;
    }
    .btn-secondary,
    .btn-primary {
        min-height: 48px;
        padding: 0.875rem 1.5rem;
    }
}
/* ==========================================
   @media (prefers-reduced-motion: reduce) - 合并的减少动画样式
   ========================================== */
@media (prefers-reduced-motion: reduce) {
    .balance-updated,
    .balance-updating::after,
    .balance-error,
    .balance-success {
        animation: none;
    }
    .stat-value {
        transition: none;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    #progressCard .new-card-title i {
        animation: none;
    }
}
/* ==========================================
   @media (max-width: 640px) - 合并的移动端响应式样式
   ========================================== */
@media (max-width: 640px) {
    :root {
        --font-size-base: 0.875rem; /* 14px on mobile */
    }
    .new-card {
        padding: var(--spacing-md);
    }
    .new-card-header {
        padding-bottom: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }
    .new-card-title {
        font-size: var(--font-size-sm);
    }
    .new-card-description {
        font-size: var(--font-size-xs);
    }
    .new-card-content {
        font-size: var(--font-size-xs);
    }
}
/* ===== 超小屏幕优化 (iPhone SE) ===== */

@media (max-width: 767px) {
    .price-card {
        padding: 20px;
    }
    .price-card-title {
        font-size: var(--font-size-xl);
    }
    .price-card-price {
        font-size: 26px;
    }
}

@media (max-width: 768px) {
    .pricing-grid {
        display: none;
    }
    .mobile-swipe-container {
        display: block;
    }
    .testimonial-grid {
        display: none;
    }
    .pricing-section {
        margin-bottom: 30px;
    }
    .pricing-section-inner {
        padding: 20px 15px;
        border-radius: 15px;
    }
    .section-title {
        font-size: var(--font-size-base);
        margin-bottom: 20px;
        letter-spacing: 0.3px;
    }
    .section-title i {
        font-size: var(--font-size-sm);
    }
}