.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
    border-radius: var(--radius-md);
}

.btn-primary {
    background: var(--primary-500);
    color: white;
    border-color: var(--primary-500);
}

.btn-primary:hover {
    background: var(--primary-700);
    border-color: var(--primary-700);
    box-shadow: 0 4px 12px rgba(36, 104, 242, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    border-color: var(--gray-400);
}

.btn-accent {
    background: var(--accent-300);
    color: var(--gray-800);
    border-color: var(--accent-300);
    font-weight: 700;
}

.btn-accent:hover {
    background: #c49838;
    border-color: #c49838;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.section {
    padding: 100px 40px;
    max-width: var(--content-max-width);
    margin: 0 auto;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 44px;
    letter-spacing: -0.015em;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

.section-fade-in {
    opacity: 0;
    transform: translateY(30px) translateZ(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section-fade-in.visible {
    will-change: transform, opacity;
    opacity: 1;
    transform: translateY(0) translateZ(0);
}

.section-cta {
    text-align: center;
    margin-top: 40px;
}

.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0;
    margin-bottom: 36px;
    justify-content: center;
    flex-wrap: wrap;
}

.tab {
    padding: 16px 28px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    border-radius: 0;
}

.tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.tab.active {
    color: var(--primary-500);
    border-bottom-color: var(--primary-500);
    background: transparent;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.model-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.2s ease;
    position: relative;
}

.model-card:hover {
    border-color: var(--primary-500);
    background: var(--bg-secondary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.model-badge {
    display: inline-block;
    background: var(--primary-500);
    color: white;
    padding: 4px 14px;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

.model-badge.hot {
    background: var(--accent-300);
    color: var(--gray-800);
}

.model-name {
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    margin-bottom: 12px;
}

.model-desc {
    font-size: 14px;
    font-weight: 400;
    line-height: 22px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.model-tag {
    display: inline-block;
    background: rgba(36, 104, 242, 0.08);
    color: var(--primary-500);
    padding: 4px 14px;
    font-size: 11px;
    font-weight: 600;
    margin-right: 8px;
    margin-bottom: 8px;
    border-radius: var(--radius-sm);
}

.model-grid-5 {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.model-card-enhanced {
    position: relative;
    overflow: hidden;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.model-card-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.02) 0%, rgba(59, 130, 246, 0.06) 100%);
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

.model-card-enhanced:hover::before {
    opacity: 1;
}

.model-card-enhanced:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(36, 104, 242, 0.12);
}

.model-card-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
}

.model-card-gradient--blue { background: linear-gradient(90deg, #3b82f6, #60a5fa); }
.model-card-gradient--purple { background: linear-gradient(90deg, #8b5cf6, #a78bfa); }
.model-card-gradient--green { background: linear-gradient(90deg, #10b981, #34d399); }
.model-card-gradient--orange { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.model-card-gradient--cyan { background: linear-gradient(90deg, #06b6d4, #22d3ee); }
.model-card-gradient--pink { background: linear-gradient(90deg, #ec4899, #f472b6); }

.model-category-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    letter-spacing: 0.3px;
}

.model-card-enhanced--blue .model-category-tag { background: rgba(59, 130, 246, 0.08); color: #3b82f6; }
.model-card-enhanced--purple .model-category-tag { background: rgba(139, 92, 246, 0.08); color: #8b5cf6; }
.model-card-enhanced--green .model-category-tag { background: rgba(16, 185, 129, 0.08); color: #10b981; }
.model-card-enhanced--orange .model-category-tag { background: rgba(245, 158, 11, 0.08); color: #f59e0b; }
.model-card-enhanced--cyan .model-category-tag { background: rgba(6, 182, 212, 0.08); color: #06b6d4; }
.model-card-enhanced--pink .model-category-tag { background: rgba(236, 72, 153, 0.08); color: #ec4899; }

.model-logo {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    border-radius: var(--radius-lg);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.model-card-enhanced--blue .model-logo { background: rgba(59, 130, 246, 0.08); color: #3b82f6; }
.model-card-enhanced--purple .model-logo { background: rgba(139, 92, 246, 0.08); color: #8b5cf6; }
.model-card-enhanced--green .model-logo { background: rgba(16, 185, 129, 0.08); color: #10b981; }
.model-card-enhanced--orange .model-logo { background: rgba(245, 158, 11, 0.08); color: #f59e0b; }
.model-card-enhanced--cyan .model-logo { background: rgba(6, 182, 212, 0.08); color: #06b6d4; }
.model-card-enhanced--pink .model-logo { background: rgba(236, 72, 153, 0.08); color: #ec4899; }

.model-card-enhanced:hover .model-logo {
    transform: scale(1.1);
}

.model-card-enhanced .model-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    line-height: 24px;
}

.model-card-enhanced .model-desc {
    font-size: 14px;
    line-height: 22px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    flex: 1;
}

.model-meta {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.model-tag-outline {
    display: inline-block;
    padding: 2px 10px;
    font-size: 11px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
}

.model-card-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 600;
    background: transparent;
    color: var(--primary-500);
    border: 1px solid var(--primary-500);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

.model-card-btn:hover {
    background: var(--primary-500);
    color: #fff;
    box-shadow: 0 4px 12px rgba(36, 104, 242, 0.25);
}

.model-card-enhanced .model-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 2px 10px;
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 0;
    border-radius: var(--radius-sm);
    z-index: 2;
}

@keyframes cardShine {
    0% { left: -100%; }
    100% { left: 200%; }
}

.model-card-enhanced:hover::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: cardShine 0.6s ease forwards;
    pointer-events: none;
    z-index: 1;
}

@keyframes floatUp {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.model-card-enhanced:hover .model-logo {
    animation: floatUp 1.5s ease-in-out infinite;
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.advantage-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: all 0.2s ease;
}

.advantage-card:hover {
    border-color: var(--primary-500);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.advantage-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.advantage-title {
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    margin-bottom: 10px;
}

.advantage-desc {
    font-size: 14px;
    font-weight: 400;
    line-height: 22px;
    color: var(--text-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
    align-items: stretch;
}

.pricing-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.pricing-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: all 0.2s ease;
    position: relative;
}

.pricing-card:hover {
    border-color: var(--primary-500);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.pricing-card.featured {
    border-color: var(--primary-500);
    border-width: 3px;
}

.pricing-card.featured::before {
    content: '🔥 热销';
    position: absolute;
    top: -1px;
    left: -1px;
    background: var(--primary-500);
    color: white;
    padding: 6px 20px;
    font-size: 13px;
    font-weight: 700;
    border-radius: 0;
}

.pricing-name {
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    margin-bottom: 12px;
}

.pricing-price {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-500);
    margin: 20px 0;
}

.pricing-price span {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-secondary);
}

.pricing-feature {
    font-size: 14px;
    font-weight: 400;
    line-height: 22px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.pricing-card-btn {
    margin-top: 24px;
    width: 100%;
}

.section-bg-tertiary {
    background: linear-gradient(180deg, #ffffff 0%, var(--bg-tertiary) 100%);
}

.subscribe-scenario {
    margin: 16px 0;
}

.subscribe-card-btn {
    width: 100%;
}

.product-showcase {
    background: #fff;
    border-bottom: 1px solid var(--border-color);
}

.showcase-inner {
    max-width: 1540px;
    width: 100%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 16fr 14fr 13fr 14fr 15fr;
    gap: 0;
}

.showcase-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 28px 24px;
    border-right: 1px solid var(--border-color);
    transition: background 0.2s ease;
    cursor: pointer;
}

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

.showcase-item:hover {
    background: var(--bg-secondary);
}

.showcase-item-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(36, 104, 242, 0.1) 0%, rgba(36, 104, 242, 0.05) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-500);
    flex-shrink: 0;
}

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

.showcase-item-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-bottom: 4px;
}

.showcase-item-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-500);
    line-height: 1.2;
    margin-bottom: 4px;
}

.showcase-item-desc {
    font-size: 13px;
    color: var(--text-tertiary);
    line-height: 20px;
}