/* ============================================================
   操作员作业证管理系统 — Apple 风格设计系统
   设计令牌来源：苹果设计系统
   主色 #007aff | 背景 #f2f2f7 | 文字 #1d1d1f
   ============================================================ */

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-primary: #007aff;
    --color-primary-dark: #004fad;
    --color-primary-light: #e8f2ff;
    --color-bg: #f2f2f7;
    --color-surface: #ffffff;
    --color-surface-alt: #f7f7fa;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #8e8e93;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-strong: #e5e5ea;
    --color-success: #34c759;
    --color-success-bg: #e9f9ee;
    --color-success-text: #166534;
    --color-error: #ff3b30;
    --color-error-bg: #ffecea;
    --color-error-text: #991b1b;
    --color-warning: #ff9f0a;
    --color-warning-bg: #fff4e0;
    --color-warning-text: #92400e;
    --color-info: #004fad;
    --color-info-bg: #e8f2ff;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-pill: 999px;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.10);
    --shadow-modal: 0 24px 64px rgba(0, 0, 0, 0.12);
    --font-sans: -apple-system, "SF Pro Display", "DM Sans", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.mono { font-family: var(--font-mono); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-center { text-align: center; }
.hidden { display: none !important; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 页面布局 ===== */
.page { min-height: 100vh; }

/* ===== 顶部导航 ===== */
.topnav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 56px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}
.topnav-brand {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.3px;
}
.topnav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}
.topnav-link {
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    color: var(--color-text-secondary);
    transition: all 0.15s;
}
.topnav-link:hover {
    background: var(--color-surface-alt);
    text-decoration: none;
}
.topnav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* ===== 页面头部 ===== */
.page-header {
    text-align: center;
    padding: 48px 24px 32px;
}
.page-header h1 {
    font-size: 34px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--color-text);
    margin-bottom: 8px;
}
.page-header .subtitle {
    color: var(--color-text-secondary);
    font-size: 15px;
}

/* ===== 容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 48px;
}

/* ===== 标签页 ===== */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--color-border-strong);
    margin-bottom: 24px;
    overflow-x: auto;
}
.tab {
    padding: 12px 20px;
    font-size: 15px;
    color: var(--color-text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.15s;
    white-space: nowrap;
}
.tab:hover { color: var(--color-text); }
.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== 卡片 ===== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 16px;
    margin-bottom: 14px;
    box-shadow: var(--shadow-card);
}
.card-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 14px;
    padding-left: 12px;
    border-left: 3px solid var(--color-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-title .count {
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    padding: 2px 10px;
    border-radius: var(--radius-pill);
}

/* ===== 表单 ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px 20px;
}
.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.field-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
}
.input, .select, .textarea {
    padding: 10px 14px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color 0.15s, box-shadow 0.15s;
    width: 100%;
}
.input:focus, .select:focus, .textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
}
.textarea { resize: vertical; min-height: 80px; }
input[type="file"] {
    font-size: 13px;
}
.upload-preview {
    margin-top: 6px;
    max-height: 60px;
    max-width: 100%;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-strong);
    padding: 2px;
    background: var(--color-surface-alt);
}
.form-actions {
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.form-msg {
    font-size: 14px;
}
.form-msg.ok { color: var(--color-success); }
.form-msg.err { color: var(--color-error); }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.15s;
    line-height: 1.4;
    text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: #0064d6; }
.btn-success { background: var(--color-success); color: #fff; }
.btn-success:hover { background: #30d158; }
.btn-danger { background: var(--color-error); color: #fff; }
.btn-danger:hover { background: #ff453a; }
.btn-warning { background: var(--color-warning); color: #fff; }
.btn-warning:hover { background: #f0a800; }
.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-strong);
}
.btn-ghost:hover { background: var(--color-surface-alt); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 17px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== 标签 ===== */
.tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.6;
}
.tag-success { background: var(--color-success-bg); color: var(--color-success-text); }
.tag-warning { background: var(--color-warning-bg); color: var(--color-warning-text); }
.tag-danger { background: var(--color-error-bg); color: var(--color-error-text); }
.tag-info { background: var(--color-info-bg); color: var(--color-info); }
.tag-muted { background: var(--color-border-strong); color: var(--color-text-secondary); }

/* ===== 表格 ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.data-table th,
.data-table td {
    padding: 12px 10px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}
.data-table th {
    background: var(--color-surface-alt);
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
}
.data-table tbody tr:hover { background: var(--color-surface-alt); }
.data-table .empty {
    text-align: center;
    color: var(--color-text-tertiary);
    padding: 40px;
}
.row-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}
.table-wrap {
    overflow-x: auto;
    border-radius: var(--radius-md);
}

/* ===== 筛选栏 ===== */
.filter-bar {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 14px 20px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.filter-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}
.filter-row-top { align-items: center; }
.filter-row-advanced { display: none; }
.filter-bar.expanded .filter-row-advanced { display: flex; }
.filter-search-wrap {
    flex: 1;
    min-width: 220px;
    position: relative;
}
.filter-search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    pointer-events: none;
}
.filter-search-input {
    width: 100%;
    padding: 10px 14px 10px 38px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-surface-alt);
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
.filter-search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
    background: var(--color-surface);
}
.filter-count {
    font-size: 13px;
    color: var(--color-text-secondary);
    white-space: nowrap;
    font-weight: 500;
}
.filter-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 120px;
}
.filter-group .field-label {
    font-size: 12px;
}
.filter-toggle-icon { transition: transform 0.2s ease; }
.filter-bar.expanded .filter-toggle-icon { transform: rotate(180deg); }

/* ===== 证书管理筛选栏 ===== */
.cert-filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding: 14px 16px;
    background: var(--color-surface-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}
.cert-filter-search {
    flex: 1;
    min-width: 200px;
    padding: 9px 14px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.cert-filter-search:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
}
.cert-filter-select {
    width: auto;
    min-width: 130px;
    padding: 9px 30px 9px 12px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-surface);
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.cert-filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
}
.cert-filter-bar .btn-sm { white-space: nowrap; }

/* ===== 模态框 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    overflow-y: auto;
}
.modal-overlay[hidden] { display: none; }
.modal-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 760px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-modal);
    animation: modalIn 0.2s ease-out;
}
@keyframes modalIn {
    from { transform: translateY(20px) scale(0.98); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-surface);
    z-index: 1;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}
.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}
.modal-close:hover { color: var(--color-error); }
.modal-body { padding: 24px; }
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: flex-end;
    position: sticky;
    bottom: 0;
    background: var(--color-surface);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ===== 证书卡片网格 ===== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 24px;
}

/* ===== 证书翻转卡片 ===== */
.cert-card {
    width: 100%;
    max-width: 440px;
    height: 400px;
    margin: 0 auto;
    perspective: 1400px;
    cursor: pointer;
    outline: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    position: relative;
    /* 性能优化：告知浏览器此元素独立于其他内容，减少重排/重绘计算 */
    contain: layout style;
    content-visibility: auto;
    contain-intrinsic-size: 440px 400px;
}
.cert-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.cert-card:focus-visible {
    outline: 3px solid var(--color-warning);
    outline-offset: 4px;
}
.cert-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
    border-radius: var(--radius-lg);
}
.cert-card.flipped .cert-card-inner { transform: rotateY(180deg); }
.cert-front, .cert-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.cert-back { transform: rotateY(180deg); }

/* 正面 */
.cert-front {
    background: linear-gradient(135deg, #fff 0%, #f7f7fa 100%);
    transform-style: preserve-3d;
}
.cert-band {
    background: linear-gradient(135deg, var(--color-primary) 0%, #2e8dff 100%);
    color: #fff;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    flex-shrink: 0;
    box-shadow: 0 1px 4px rgba(0, 122, 255, 0.18);
}
.cert-company {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 14px;
    min-width: 0;
}
.cert-company-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.cert-ico-emoji { font-size: 16px; }
.cert-ico-img { width: 18px; height: 18px; border-radius: 3px; object-fit: contain; }
.cert-body {
    display: flex;
    gap: 20px;
    align-items: center;
    padding: 22px 22px 16px;
    flex: 1;
    min-height: 0;
}
.cert-photo-wrap {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.cert-photo {
    width: 108px;
    height: 140px;
    object-fit: cover;
    border-radius: 8px;
    border: 2px solid var(--color-surface);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
    background: var(--color-bg);
}
.cert-photo-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: var(--color-text-tertiary);
}
.cert-days-left {
    font-size: 11px;
    color: var(--color-success-text);
    background: var(--color-success-bg);
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    font-weight: 500;
}
.cert-days-left.warning {
    color: var(--color-warning-text);
    background: var(--color-warning-bg);
}
.cert-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0;
}
.cert-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.3px;
    margin-bottom: 4px;
}
.cert-label {
    display: inline-block;
    font-size: 11px;
    color: var(--color-text-secondary);
    margin-right: 8px;
    padding: 1px 6px;
    background: var(--color-bg);
    border-radius: 4px;
    min-width: 32px;
    text-align: center;
}
.cert-value { font-size: 14px; color: var(--color-text); }
.cert-skill-value { font-weight: 600; }
.cert-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 22px;
    border-top: 1px dashed var(--color-border-strong);
    flex-shrink: 0;
    min-height: 64px;
    gap: 12px;
    position: relative;
}
.cert-sigs { display: flex; gap: 28px; align-items: center; }
.cert-sig { display: flex; align-items: center; gap: 8px; }
.cert-sig-label { font-size: 12px; color: var(--color-text-secondary); font-weight: 500; }
.cert-sig-img {
    height: 48px;
    width: auto;
    max-width: 160px;
    image-rendering: -webkit-optimize-contrast;
}
.cert-seal {
    position: absolute;
    top: -28px;
    right: 10px;
    width: 100px;
    height: 100px;
    object-fit: contain;
    opacity: 0.88;
    transform: rotate(-8deg);
    pointer-events: none;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2)) saturate(1.3) contrast(1.05);
    transition: opacity 0.3s ease;
    image-rendering: -webkit-optimize-contrast;
    z-index: 2;
}
.cert-card.flipped .cert-seal { opacity: 0; }
.cert-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 22px;
    border-top: 1px dashed var(--color-border-strong);
    background: var(--color-surface-alt);
    flex-shrink: 0;
}
.cert-review-time { font-size: 10px; color: var(--color-text-tertiary); }
.cert-no {
    font-size: 10px;
    color: var(--color-text-secondary);
    background: var(--color-border-strong);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}

/* 背面 */
.cert-back {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px 20px;
}
.cert-expired-stamp {
    position: absolute;
    top: 50%;
    left: 50%;
    background: rgba(255, 59, 48, 0.92);
    color: #fff;
    padding: 10px 28px;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 6px;
    border: 3px double rgba(255, 255, 255, 0.7);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    z-index: 3;
    pointer-events: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    transform: translate(-50%, -50%) rotate(-12deg);
}
.cert-back-title {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 6px;
    margin-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 12px;
    width: 80%;
}
.cert-valid-period {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}
.cert-valid-block { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.cert-valid-cap {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.7);
    padding: 1px 8px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-pill);
}
.cert-valid-date { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.cert-valid-arrow { font-size: 18px; color: var(--color-warning); font-weight: 700; }
.cert-days-summary {
    font-size: 14px;
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    margin-bottom: 16px;
    font-weight: 500;
}
.cert-days-summary.safe { background: rgba(52, 199, 89, 0.25); color: #86efac; }
.cert-days-summary.warning { background: rgba(255, 159, 10, 0.25); color: #fcd34d; }
.cert-days-summary.expired { background: rgba(255, 59, 48, 0.3); color: #fecaca; }
.cert-back-meta {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    text-align: center;
}
.cert-renew-btn {
    margin-top: 12px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}
.cert-renew-btn:hover { background: rgba(255, 255, 255, 0.3); }

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    color: var(--color-text-tertiary);
    padding: 80px 20px;
    font-size: 16px;
}

/* 加载更多按钮 */
.load-more-wrap {
    text-align: center;
    padding: 24px 16px 48px;
}
.load-more-btn:disabled {
    opacity: 0.6;
    cursor: default;
}

/* ===== 登录页 ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    padding: 20px;
}
.login-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    width: 100%;
    max-width: 360px;
    box-shadow: var(--shadow-modal);
}
.login-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 8px;
}
.login-subtitle {
    font-size: 14px;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 28px;
}
.login-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--color-text);
    background: var(--color-surface-alt);
    margin-bottom: 16px;
}
.login-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
    background: var(--color-surface);
}
.login-btn {
    width: 100%;
    padding: 12px;
    background: #1d4ed8;
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}
.login-btn:hover { background: #1e40af; }
.login-error {
    color: var(--color-error);
    font-size: 14px;
    text-align: center;
    margin-bottom: 16px;
    background: var(--color-error-bg);
    padding: 10px;
    border-radius: var(--radius-sm);
}

/* ===== 签名字段 ===== */
.sig-field {
    grid-column: span 2;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    background: var(--color-surface-alt);
}
.sig-field-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: 8px;
}
.sig-input-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
}
.sig-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    font-size: 13px;
    cursor: pointer;
    color: transparent;
}
.sig-input::placeholder { color: var(--color-text-tertiary); }
.sig-placeholder {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    font-size: 13px;
    pointer-events: none;
    background: var(--color-surface);
    padding: 0 4px;
}
.sig-placeholder.has-sig {
    color: var(--color-primary);
    font-weight: 500;
}
.sig-clear {
    background: var(--color-error);
    color: #fff;
    padding: 6px 12px;
    font-size: 12px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    flex-shrink: 0;
}
.sig-clear:hover { background: #ff453a; }
.sig-default {
    background: #0ea5e9;
    color: #fff;
    padding: 6px 12px;
    font-size: 12px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    flex-shrink: 0;
}
.sig-default:hover { background: #0284c7; }

/* ===== 默认资源管理（签名/ICO/公章上传） ===== */
.default-asset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 8px;
}
.default-asset-item {
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    padding: 14px;
    background: var(--color-surface);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.default-asset-item .field-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}
.default-asset-preview {
    width: 100%;
    min-height: 90px;
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius-sm);
    background: var(--color-surface-alt);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 8px;
}
.default-asset-preview img {
    max-width: 100%;
    max-height: 70px;
    object-fit: contain;
}
.default-asset-path {
    font-size: 11px;
    color: var(--color-text-tertiary);
    margin-top: 4px;
    word-break: break-all;
    text-align: center;
}
.default-asset-empty {
    font-size: 12px;
    color: var(--color-text-tertiary);
}
.default-asset-item input[type="file"] {
    font-size: 12px;
}
.default-asset-actions {
    display: flex;
    gap: 8px;
}

/* ===== 签名弹窗 ===== */
.sig-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
}
.sig-modal[hidden] { display: none; }
.sig-modal-content {
    background: var(--color-surface);
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.sig-modal-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
}
.sig-modal-head h3 { font-size: 17px; font-weight: 600; }
.sig-modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0 4px;
}
.sig-modal-close:hover { color: var(--color-error); }
.sig-modal-body {
    padding: 16px;
    flex: 1;
    overflow: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.sig-counter {
    text-align: center;
    font-size: 14px;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    padding: 8px;
    border-radius: var(--radius-sm);
}
.sig-pad {
    width: 100%;
    flex: 1;
    min-height: 320px;
    background: var(--color-surface);
    border: 2px dashed var(--color-text-tertiary);
    border-radius: var(--radius-md);
    cursor: crosshair;
    touch-action: none;
    display: block;
}
.sig-pad-tips {
    font-size: 13px;
    color: var(--color-text-tertiary);
    text-align: center;
}
.sig-modal-actions {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface-alt);
    flex-wrap: wrap;
}
.sig-modal-actions .btn {
    flex: 1;
    min-height: 44px;
}

/* ===== 预设值管理 ===== */
.preset-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
    min-height: 36px;
}
.preset-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 8px 6px 14px;
    background: var(--color-info-bg);
    color: var(--color-info);
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 500;
}
.preset-item-remove {
    background: none;
    border: none;
    color: var(--color-info);
    cursor: pointer;
    font-size: 16px;
    padding: 0 4px;
    line-height: 1;
    opacity: 0.6;
}
.preset-item-remove:hover { opacity: 1; color: var(--color-error); }
.preset-add {
    display: flex;
    gap: 8px;
}
.preset-add .input { flex: 1; }

/* ===== 模式选择 ===== */
.mode-selector {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}
.mode-card {
    border: 2px solid var(--color-border-strong);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--color-surface);
}
.mode-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.12);
    transform: translateY(-2px);
}
.mode-icon {
    font-size: 48px;
    margin-bottom: 16px;
}
.mode-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}
.mode-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ===== 考试续期 - 证书选择 ===== */
.renew-cert-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}
.renew-cert-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 2px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color 0.15s;
}
.renew-cert-option:hover { border-color: var(--color-primary); }
.renew-cert-option input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
    flex-shrink: 0;
}
.renew-cert-skill {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
}
.renew-cert-meta {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

/* ===== 考试答题 ===== */
.exam-info {
    font-size: 14px;
    color: var(--color-text-secondary);
    background: var(--color-info-bg);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}
.exam-warn {
    padding: 14px 16px;
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
    border-radius: var(--radius-md);
    font-size: 14px;
    margin-bottom: 16px;
}
.exam-q {
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
}
.exam-q:last-child { border-bottom: none; }
.exam-q-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}
.exam-q-num {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}
.exam-q-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    flex: 1;
    min-width: 200px;
}
.exam-q-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-left: 38px;
}
.exam-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s;
}
.exam-option:hover {
    background: var(--color-surface-alt);
    border-color: var(--color-primary);
}
.exam-option input {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
    flex-shrink: 0;
}
.exam-option input:checked + span {
    color: var(--color-primary);
    font-weight: 600;
}
.exam-option span {
    font-size: 14px;
    color: var(--color-text);
}

/* ===== 考试结果 ===== */
.exam-result-summary {
    text-align: center;
    padding: 32px 20px;
}
.exam-result-icon {
    font-size: 72px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 16px;
}
.exam-result-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}
.exam-result-score {
    font-size: 48px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 12px;
    letter-spacing: -1px;
}
.exam-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.exam-detail {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    border-left: 4px solid;
}
.exam-detail.correct {
    background: var(--color-success-bg);
    border-left-color: var(--color-success);
}
.exam-detail.wrong {
    background: var(--color-error-bg);
    border-left-color: var(--color-error);
}
.exam-detail-head {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}
.exam-detail-icon {
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}
.exam-detail.correct .exam-detail-icon { color: var(--color-success); }
.exam-detail.wrong .exam-detail-icon { color: var(--color-error); }
.exam-detail-ans {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding-left: 26px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.ans-right { color: var(--color-success); font-weight: 600; }
.ans-wrong { color: var(--color-error); font-weight: 600; }

/* ===== 题库表单选项 ===== */
.q-option-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}
.q-option-correct {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}
.q-option-correct input {
    width: 20px;
    height: 20px;
    accent-color: var(--color-success);
}
.q-option-input {
    flex: 1;
}

/* ===== 题库管理双列布局 ===== */
.q-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 20px;
    align-items: start;
}
.q-form-card {
    position: sticky;
    top: 20px;
}
.q-form-card .field-row {
    display: flex;
    gap: 12px;
}
.q-form-card .field-row .field { flex: 1; }
.q-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}
.q-list-header .card-title { margin-bottom: 0; }
.q-skill-filter { width: auto; min-width: 150px; max-width: 200px; }

/* ===== 证书列表独立页 ===== */
.cert-stats-bar {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.cert-stat-item {
    flex: 1;
    min-width: 120px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.cert-stat-num {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
}
.cert-stat-num.cert-stat-approved { color: var(--color-success); }
.cert-stat-num.cert-stat-pending { color: var(--color-warning); }
.cert-stat-num.cert-stat-expired { color: var(--color-error); }
.cert-stat-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 4px;
}
.cert-status-filter {
    min-width: 120px;
    max-width: 160px;
}
.cert-grid-admin {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}
.cert-admin-card {
    display: flex;
    flex-direction: column;
    gap: 0;
}
.cert-admin-card .cert-card {
    margin: 0;
}
.cert-admin-actions {
    display: flex;
    gap: 6px;
    padding: 10px 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    flex-wrap: wrap;
}
.cert-status-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
    z-index: 2;
}
.cert-status-tag.tag-success { background: rgba(34,197,94,0.15); color: #16a34a; }
.cert-status-tag.tag-warning { background: rgba(245,158,11,0.15); color: #d97706; }
.cert-status-tag.tag-danger { background: rgba(239,68,68,0.15); color: #dc2626; }
.cert-band { position: relative; }

/* 管理后台链接卡片 */
.admin-link-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 1px solid #bae6fd;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: box-shadow 0.2s, transform 0.15s;
    margin-bottom: 20px;
}
.admin-link-card:hover {
    box-shadow: 0 4px 12px rgba(2,132,199,0.15);
    transform: translateY(-1px);
}
.admin-link-card-icon {
    font-size: 32px;
    flex-shrink: 0;
}
.admin-link-card-body { flex: 1; }
.admin-link-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}
.admin-link-card-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
}
.admin-link-card-arrow {
    font-size: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .topnav { padding: 0 16px; }
    .topnav-brand { font-size: 15px; }
    .topnav-link { padding: 4px 10px; font-size: 13px; }
    .page-header { padding: 32px 16px 24px; }
    .page-header h1 { font-size: 26px; }
    .container { padding: 0 16px 32px; }
    .card { padding: 16px; }
    .cert-grid { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .sig-field { grid-column: span 1; }

    /* 移动端筛选栏：高级筛选项全宽排列 */
    .filter-group { width: 100%; flex: none; }
    .filter-search-wrap { min-width: 0; flex: 1; }

    .table-wrap { overflow-x: auto; }
    .data-table { min-width: 600px; }
    .cert-grid-admin { grid-template-columns: 1fr; }
    .cert-stats-bar { gap: 8px; }
    .cert-stat-item { min-width: 80px; padding: 12px 8px; }
    .cert-stat-num { font-size: 22px; }
    .cert-filter-search { min-width: 100%; }
    .cert-filter-select { flex: 1; min-width: calc(50% - 5px); }
    .q-layout { grid-template-columns: 1fr; }
    .q-form-card { position: static; }
    .q-form-card .field-row { flex-direction: column; }
}

@media (max-width: 480px) {
    .input, .select, .textarea { font-size: 16px; min-height: 44px; }
    .btn { min-height: 44px; font-size: 14px; }
    .modal-overlay { padding: 0; }
    .modal-card { max-height: 100vh; border-radius: 0; min-height: 100vh; }
    .modal-header { border-radius: 0; }
    .page-header h1 { font-size: 22px; }
    .cert-card { max-width: 100%; height: 370px; }
}