/* 通用子页面样式 */

/* 页面顶部Banner */
.page-banner {
    position: relative; padding: 80px 0 60px;
    background: linear-gradient(135deg, #0d1a2d 0%, #0a1a1a 100%);
    text-align: center; overflow: hidden;
}
.page-banner::before {
    content: ''; position: absolute; top: -100px; right: -100px;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(0,212,170,0.06) 0%, transparent 70%);
    border-radius: 50%;
}
.page-banner-tag {
    display: inline-block; padding: 4px 16px; border-radius: 20px;
    background: var(--accent-glow); color: var(--accent);
    font-size: 13px; font-weight: 600; margin-bottom: 16px;
}
.page-banner h1 { font-size: 36px; font-weight: 700; margin-bottom: 12px; }
.page-banner p { color: var(--text-secondary); font-size: 16px; }

/* 内容区 - 侧边导航布局 */
.page-content { padding: 80px 0; }
.page-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 48px;
    align-items: start;
}

/* 侧边导航 */
.page-sidebar {
    position: sticky; top: calc(var(--header-height, 72px) + 24px);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 0;
    overflow: hidden;
}
.page-sidebar-title {
    padding: 16px 24px 12px;
    font-size: 16px; font-weight: 700; color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    margin-bottom: 4px;
}
.page-sidebar a {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 24px;
    font-size: 14px; color: var(--text-secondary);
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}
.page-sidebar a:hover {
    color: var(--accent); background: var(--accent-glow);
}
.page-sidebar a.active {
    color: var(--accent); font-weight: 600;
    border-left-color: var(--accent); background: var(--accent-glow);
}
.page-sidebar a .sidebar-icon {
    width: 20px; text-align: center; font-size: 15px;
}

/* 主内容区 */
.page-main {}
.page-main h2 {
    font-size: 24px; font-weight: 700; margin-bottom: 16px;
    color: var(--text-primary);
}
.page-main h3 {
    font-size: 18px; font-weight: 600; margin-bottom: 12px;
    color: var(--text-primary);
}
.page-main p {
    font-size: 15px; line-height: 1.8; color: var(--text-secondary);
    margin-bottom: 16px;
}
.page-main .lead {
    font-size: 16px; color: var(--text-primary); font-weight: 500;
    margin-bottom: 24px;
}

/* 内容卡片 */
.page-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 32px;
    margin-bottom: 24px;
}
.page-card h3 {
    margin-bottom: 16px;
}

/* 特性列表 */
.feature-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
    margin: 24px 0;
}
.feature-item {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px;
    text-align: center; transition: all 0.3s ease;
}
.feature-item:hover {
    border-color: var(--accent); transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,212,170,0.1);
}
.feature-icon {
    font-size: 36px; margin-bottom: 12px;
}
.feature-item h4 {
    font-size: 15px; font-weight: 600; margin-bottom: 8px;
}
.feature-item p {
    font-size: 13px; line-height: 1.6; margin-bottom: 0;
}

/* 流程步骤 */
.step-list {
    display: flex; gap: 0; margin: 24px 0; flex-wrap: wrap;
}
.step-item {
    flex: 1; min-width: 120px; text-align: center; position: relative;
    padding: 20px 12px;
}
.step-item::after {
    content: '→'; position: absolute; right: -6px; top: 50%;
    transform: translateY(-50%);
    color: var(--accent); font-size: 18px; font-weight: 700;
}
.step-item:last-child::after { display: none; }
.step-num {
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--accent-glow); color: var(--accent);
    font-size: 16px; font-weight: 700;
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: 10px;
}
.step-item h4 {
    font-size: 14px; font-weight: 600; margin-bottom: 4px;
}
.step-item p {
    font-size: 12px; margin-bottom: 0;
}

/* 数据指标行 */
.data-row {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
    margin: 24px 0;
}
.data-item {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
    text-align: center;
}
.data-value {
    font-size: 28px; font-weight: 700; color: var(--accent);
}
.data-label {
    font-size: 13px; color: var(--text-secondary); margin-top: 4px;
}

/* Mobile 768px */
@media (max-width: 768px) {
    .page-banner { padding: 48px 0 36px; }
    .page-banner h1 { font-size: 24px; }
    .page-banner p { font-size: 14px; }
    .page-banner-tag { font-size: 11px; padding: 3px 12px; }
    .page-content { padding: 32px 0; }

    .page-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .page-sidebar {
        position: static;
        display: flex; overflow-x: auto;
        padding: 0; gap: 0;
        border-radius: var(--radius);
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .page-sidebar::-webkit-scrollbar { display: none; }
    .page-sidebar-title { display: none; }
    .page-sidebar a {
        white-space: nowrap; padding: 10px 16px;
        border-left: none; border-bottom: 2px solid transparent;
        font-size: 13px;
    }
    .page-sidebar a.active {
        border-left: none; border-bottom-color: var(--accent);
    }

    .page-main h2 { font-size: 20px; margin-bottom: 12px; }
    .page-main h3 { font-size: 17px; margin-bottom: 10px; }
    .page-main p { font-size: 14px; }
    .page-card { padding: 20px; }

    .feature-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .feature-item { padding: 16px; }
    .feature-icon { font-size: 28px; margin-bottom: 8px; }
    .data-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .data-value { font-size: 24px; }
    .step-list { flex-direction: column; }
    .step-item::after { display: none; }
    .step-item { padding: 12px 0; }
}

/* ===== Narrow Mobile 540px — 渐进收缩 ===== */
@media (max-width: 540px) {
    .page-banner { padding: 40px 0 32px; }
    .page-banner h1 { font-size: 22px; }
    .page-banner p { font-size: 14px; }

    .feature-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .feature-item { padding: 16px; }
    .feature-icon { font-size: 30px; margin-bottom: 8px; }
    .data-row { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .data-value { font-size: 24px; }
    .page-card { padding: 20px; }
    .page-main h2 { font-size: 20px; }
    .page-main h3 { font-size: 17px; }
}

/* Small Mobile 480px */
@media (max-width: 480px) {
    .page-banner { padding: 36px 0 28px; }
    .page-banner h1 { font-size: 20px; margin-bottom: 8px; }
    .page-banner p { font-size: 13px; }

    .feature-grid { grid-template-columns: 1fr; gap: 10px; }
    .feature-item { padding: 14px; }
    .feature-icon { font-size: 26px; margin-bottom: 8px; }
    .feature-item h4 { font-size: 14px; }
    .feature-item p { font-size: 12px; line-height: 1.5; }
    .data-row { grid-template-columns: 1fr 1fr; gap: 8px; }
    .data-item { padding: 14px; }
    .data-value { font-size: 20px; }
    .data-label { font-size: 12px; }
    .page-card { padding: 16px; }
    .page-main h2 { font-size: 18px; }
    .page-main h3 { font-size: 16px; }
    .page-main p { font-size: 13px; }
    .step-item h4 { font-size: 13px; }
    .step-item p { font-size: 11px; }
}

/* Extra Small 360px */
@media (max-width: 360px) {
    .page-banner { padding: 28px 0 24px; }
    .page-banner h1 { font-size: 18px; }
    .page-banner p { font-size: 12px; }

    .feature-grid { gap: 8px; }
    .feature-item { padding: 12px; }
    .feature-icon { font-size: 22px; }
    .feature-item h4 { font-size: 13px; }
    .feature-item p { font-size: 11px; }
    .data-row { gap: 6px; }
    .data-item { padding: 10px; }
    .data-value { font-size: 18px; }
    .data-label { font-size: 11px; }
    .page-card { padding: 14px; }
    .page-main h2 { font-size: 16px; }
    .page-main p { font-size: 12px; }
    .page-sidebar a { font-size: 12px; padding: 8px 12px; }
}