:root {
    --primary: #1f4e5f;
    --primary-dark: #133340;
    --primary-light: #2f7a8f;
    --primary-50: #edf4f6;
    --primary-100: #d3e4e9;
    --primary-200: #a7c9d2;
    --gold: #c48a3a;
    --gold-light: #e5c48c;
    --gold-50: #fbf5ea;
    --success: #2e7d32;
    --success-light: #e8f5e9;
    --warning: #b8860b;
    --warning-light: #fff8e1;
    --danger: #c62828;
    --danger-light: #fdecea;
    --gray: #6b7280;
    --gray-light: #f3f4f6;
    --bg: #f4f6f8;
    --card-bg: #ffffff;
    --text: #1a2332;
    --text-2: #4a5568;
    --text-3: #8896a6;
    --border: #c8d1dc;
    --border-light: #e4e9ef;
    --shadow-sm: 0 2px 8px rgba(31,78,95,.06);
    --shadow-md: 0 4px 20px rgba(31,78,95,.08);
    --shadow-lg: 0 8px 32px rgba(31,78,95,.12);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px;
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: all .2s ease; }

/* Header */
header {
    position: relative;
    margin-bottom: 28px;
    padding: 40px 36px 36px;
    background: linear-gradient(160deg, var(--primary-dark) 0%, var(--primary) 55%, var(--primary-light) 100%);
    border-radius: 16px;
    color: #fff;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    text-align: center;
}
header::before {
    content: "";
    position: absolute;
    top: -80px; right: -60px;
    width: 340px; height: 340px;
    background: radial-gradient(circle, rgba(196,138,58,.18) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
header > * { position: relative; z-index: 1; }
header h1 {
    font-size: 28px;
    margin: 0 0 8px 0;
    font-weight: 700;
    letter-spacing: .5px;
}
header p { font-size: 14.5px; opacity: .82; letter-spacing: .5px; }

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
    padding: 10px 14px;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    font-size: 13px;
}
.breadcrumb a {
    color: var(--primary);
    font-weight: 500;
}
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb .sep { color: var(--text-3); }
.breadcrumb .current { color: var(--text-2); }

/* Back link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 16px;
    padding: 8px 16px;
    background: rgba(255,255,255,.16);
    color: #fff;
    border-radius: 8px;
    font-weight: 500;
    font-size: 13px;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,.18);
}
.back-link:hover { background: rgba(255,255,255,.28); transform: translateX(-2px); }

/* Content box */
.content-box {
    background: var(--card-bg);
    padding: 28px;
    margin-bottom: 22px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}
.content-box h2 {
    color: var(--text);
    margin: 0 0 20px 0;
    font-size: 20px;
    font-weight: 700;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--primary-100);
    display: flex;
    align-items: center;
    gap: 10px;
}
.content-box h2 .ico {
    width: 34px; height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    display: inline-flex;
    align-items: center; justify-content: center;
    font-size: 17px;
    box-shadow: 0 4px 12px rgba(31,78,95,.25);
}
.content-box h3 {
    color: var(--primary);
    font-size: 17px;
    margin: 24px 0 12px 0;
    font-weight: 700;
}
.content-box p { color: var(--text-2); line-height: 1.85; margin-bottom: 14px; }
.content-box ul, .content-box ol { padding-left: 22px; margin-bottom: 16px; }
.content-box li { margin-bottom: 10px; line-height: 1.7; color: var(--text-2); }
.content-box strong { color: var(--text); font-weight: 600; }

/* Section grid */
.section-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}
.section-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 14px;
    border: 1px solid var(--border-light);
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow-sm);
    transition: all .25s ease;
    display: flex;
    flex-direction: column;
}
.section-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-200);
}
.section-card h4 {
    color: var(--text);
    margin-bottom: 10px;
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}
.section-card p {
    font-size: 13.5px;
    color: var(--text-2);
    margin-bottom: 14px;
    flex: 1;
    line-height: 1.65;
}
.section-card a {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.section-card a:hover { color: var(--gold); gap: 8px; }

/* Step card */
.step-card {
    background: #f8fafb;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border-left: 4px solid var(--primary);
    box-shadow: 0 2px 6px rgba(31,78,95,.04);
}
.step-card h4 {
    color: var(--primary-dark);
    margin: 0 0 10px 0;
    font-size: 16px;
    font-weight: 700;
}
.step-card p { margin-bottom: 8px; font-size: 14.5px; }
.step-meta {
    margin: 10px 0 12px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.step-meta span {
    display: inline-flex;
    align-items: center;
    background: #fff;
    border: 1px solid var(--primary-200);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

/* Tables */
.table-box { overflow-x: auto; margin: 16px 0; border-radius: 12px; border: 1px solid var(--border-light); }
.content-box table,
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    background: #fff;
}
.content-box table th,
.content-box table td,
.data-table th, .data-table td {
    border: 1px solid var(--border);
    padding: 10px 12px;
    text-align: left;
    vertical-align: top;
}
.content-box table th,
.data-table th {
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    white-space: nowrap;
}
.content-box table tr:nth-child(even) td,
.data-table tr:nth-child(even) td { background: var(--primary-50); }
.data-table td.blank { height: 36px; background: #fff; }

/* Tip / Warn / Highlight */
.highlight {
    background: var(--primary-50);
    padding: 16px;
    border-radius: 10px;
    border-left: 4px solid var(--primary);
    margin: 16px 0;
    color: var(--text-2);
}
.tip-box {
    background: #e8f5e9;
    border-left: 4px solid var(--success);
    padding: 14px 16px;
    border-radius: 10px;
    margin: 14px 0;
    color: #2e7d32;
}
.warn-box {
    background: var(--danger-light);
    border-left: 4px solid var(--danger);
    padding: 14px 16px;
    border-radius: 10px;
    margin: 14px 0;
    color: var(--danger);
}
.info-box {
    background: #fff8e1;
    border-left: 4px solid var(--warning);
    padding: 14px 16px;
    border-radius: 10px;
    margin: 14px 0;
    color: #8d6e00;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--primary-50);
    color: var(--primary);
    border-radius: 14px;
    font-size: 12px;
    margin-right: 6px;
    font-weight: 500;
}

/* Form number */
.form-no {
    text-align: right;
    color: var(--text-3);
    font-size: 12px;
    margin-bottom: 4px;
}

/* Top actions */
.top-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all .2s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary-200); }
.btn-outline:hover { background: var(--primary-50); }

/* Section quick nav */
.quick-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}
.quick-nav a {
    padding: 6px 14px;
    background: var(--primary-50);
    color: var(--primary);
    border-radius: 16px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid transparent;
}
.quick-nav a:hover { background: var(--primary); color: #fff; }

/* Search */
.search-box {
    position: relative;
    margin-bottom: 20px;
}
.search-box input {
    width: 100%;
    padding: 12px 16px 12px 42px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 14px;
    outline: none;
    transition: all .2s;
}
.search-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(31,78,95,.08); }
.search-box::before {
    content: "🔍";
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    opacity: .6;
}

/* Footer */
.page-footer {
    text-align: center;
    padding: 24px;
    color: var(--text-3);
    font-size: 12px;
    margin-top: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    body { padding: 16px; }
    header { padding: 28px 22px; }
    header h1 { font-size: 22px; }
    .content-box { padding: 20px; }
    .section-grid { grid-template-columns: 1fr; }
    .data-table, .content-box table { font-size: 12.5px; }
    .data-table th, .data-table td,
    .content-box table th, .content-box table td { padding: 8px; }
}