/* ============================================
   核心共享样式 — 所有页面必须加载
   ============================================ */

/* ── CSS 变量定义 ── */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1), 0 4px 10px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 12px 30px rgba(59, 130, 246, 0.15), 0 4px 8px rgba(0, 0, 0, 0.08);
    --primary: #3b82f6;
    --primary-light: #eff6ff;

    --primary-200: #bfdbfe;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --accent-500: #8b5cf6;
    --accent-600: #7c3aed;
    --success-500: #10b981;
    --warning-500: #f59e0b;
    --danger-500: #ef4444;
    --info-500: #06b6d4;

    /* ── 工具类别色 ── */
    --cat-pdf:        #ef4444;
    --cat-pdf-light:  #fef2f2;
    --cat-pdf-border: #fecaca;
    --cat-pdf-bg:     #fee2e2;

    --cat-excel:      #10b981;
    --cat-excel-light:#ecfdf5;
    --cat-excel-border:#a7f3d0;
    --cat-excel-bg:   #d1fae5;

    --cat-image:      #3b82f6;
    --cat-image-light:#eff6ff;
    --cat-image-border:#bfdbfe;
    --cat-image-bg:   #dbeafe;

    --cat-code:       #8b5cf6;
    --cat-code-light: #f5f3ff;
    --cat-code-border:#e9d5ff;
    --cat-code-bg:    #f3e8ff;

    --cat-security:   #6366f1;
    --cat-security-light:#eef2ff;
    --cat-security-border:#c7d2fe;
    --cat-security-bg:#e0e7ff;

    --cat-qr:         #f59e0b;
    --cat-qr-light:   #fffbeb;
    --cat-qr-border:  #fde68a;
    --cat-qr-bg:      #fef3c7;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f9ff;
    --bg-input: #f8fafc;
    --bg-nav: rgba(255, 255, 255, 0.95);
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border-color: #e2e8f0;
    --border-focus: #3b82f6;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* ── 重置与基础 ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── 顶部导航 ── */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--gray-900);
}

.navbar-brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: white;
    box-shadow: var(--shadow-md);
}

.navbar-brand-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
}

.navbar-search {
    flex: 1;
    max-width: 440px;
    margin: 0 32px;
    position: relative;
}

.navbar-search input {
    width: 100%;
    padding: 9px 16px 9px 42px;
    font-size: 14px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--gray-50);
    outline: none;
    transition: var(--transition-base);
}

.navbar-search input:focus {
    border-color: var(--primary-500);
    background: white;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.navbar-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 15px;
}

.navbar-search kbd {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 11px;
    padding: 2px 6px;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: 4px;
    color: var(--gray-400);
    font-family: var(--font-sans);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: var(--gray-100);
    color: var(--gray-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: var(--transition-fast);
}

.btn-icon:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

/* ── 详情页通用骨架 ── */
.tool-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 24px 48px;
}

.tool-page .back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--gray-500);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 20px;
    padding: 6px 14px;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.tool-page .back-link:hover {
    color: var(--primary-600);
    background: var(--primary-light);
}

.tool-page h1 {
    font-size: 28px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.tool-page h1 .tool-icon {
    width: 44px;
    height: 44px;
    font-size: 20px;
    flex-shrink: 0;
}

.tool-page .page-desc {
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 8px;
    line-height: 1.7;
}

/* ── 信任提示条 ── */
.trust-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 28px;
    padding: 12px 16px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 13px;
    color: var(--gray-600);
}

.trust-bar-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.trust-bar-item svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* ── 工具区块 ── */
.tool-section {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.tool-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    padding: 4px;
}

.tool-tab {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--gray-600);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.tool-tab:hover {
    color: var(--gray-800);
    background: rgba(255, 255, 255, 0.6);
}

.tool-tab.active {
    background: white;
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
}

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

/* ── Mode Tabs ── */
.mode-tabs {
    display: flex;
    gap: 8px;
    margin: 0 0 24px 0;
    padding: 6px;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.mode-tab {
    flex: 1;
    padding: 12px 20px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--gray-600);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.mode-tab:hover {
    background: rgba(255, 255, 255, 0.6);
    color: var(--gray-800);
}

.mode-tab.active {
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
    transform: translateY(-1px);
}

.mode-tab.active:hover {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    color: white;
}

.mode-content {
    display: none;
}

.mode-content.active {
    display: block;
    animation: fadeInUp 0.3s ease;
}

/* ── 工具图标颜色变体 ── */
.tool-icon.pdf {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #dc2626;
}
.tool-icon.excel {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    color: #059669;
}
.tool-icon.image {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #2563eb;
}
.tool-icon.code {
    background: linear-gradient(135deg, #f3e8ff, #e9d5ff);
    color: #7c3aed;
}
.tool-icon.tool {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #d97706;
}
.tool-icon.security {
    background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    color: #4f46e5;
}

/* ── 工具类别色条（详情页顶部） ── */
.tool-page.pdf-page h1 { color: var(--cat-pdf); }
.tool-page.excel-page h1 { color: var(--cat-excel); }
.tool-page.image-page h1 { color: var(--cat-image); }
.tool-page.code-page h1 { color: var(--cat-code); }
.tool-page.security-page h1 { color: var(--cat-security); }
.tool-page.qr-page h1 { color: var(--cat-qr); }

.tool-page.pdf-page .back-link:hover { color: var(--cat-pdf); background: var(--cat-pdf-light); }
.tool-page.excel-page .back-link:hover { color: var(--cat-excel); background: var(--cat-excel-light); }
.tool-page.image-page .back-link:hover { color: var(--cat-image); background: var(--cat-image-light); }
.tool-page.code-page .back-link:hover { color: var(--cat-code); background: var(--cat-code-light); }
.tool-page.security-page .back-link:hover { color: var(--cat-security); background: var(--cat-security-light); }
.tool-page.qr-page .back-link:hover { color: var(--cat-qr); background: var(--cat-qr-light); }

/* ── 工具类 ── */
.hidden { display: none !important; }

/* ── 容器 ── */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 24px;
}

/* ── 动画 ── */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ── 响应式调整 ── */
@media (max-width: 768px) {
    .navbar { padding: 0 16px; height: 56px; }
    .navbar-search { display: none; }
    .tool-page { padding: 20px 16px 40px; }
    .tool-page h1 { font-size: 22px; }
    .trust-bar { gap: 8px; font-size: 12px; }
}

/* ════════════════════════════════════════
   夜间模式
   ════════════════════════════════════════ */

[data-theme="dark"] {
    --bg-primary: #1e1e1e;
    --bg-secondary: #121212;
    --bg-card: #1e1e1e;
    --bg-card-hover: #2a2a2a;
    --bg-input: #2a2a2a;
    --bg-nav: rgba(30, 30, 30, 0.95);
    --text-primary: #e5e5e5;
    --text-secondary: #a3a3a3;
    --text-muted: #6b7280;
    --border-color: #3f3f3f;
    --border-focus: #60a5fa;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --primary-500: #60a5fa;
    --primary-600: #3b82f6;
    --primary-700: #2563eb;
    --accent-500: #a78bfa;
    --accent-600: #8b5cf6;
    --gray-100: #1f2937;
    --gray-200: #374151;
    --gray-300: #4b5563;
    --gray-400: #6b7280;
    --gray-500: #9ca3af;
    --gray-600: #d1d5db;
    --gray-700: #e5e7eb;
    --gray-800: #f3f4f6;
    --gray-900: #f9fafb;
    --cat-pdf-light: #451a1a;
    --cat-pdf-border: #991b1b;
    --cat-pdf-bg: #7f1d1d;
    --cat-excel-light: #064e3b;
    --cat-excel-border: #065f46;
    --cat-excel-bg: #064e3b;
    --cat-image-light: #1e3a8a;
    --cat-image-border: #1e40af;
    --cat-image-bg: #1e3a8a;
    --cat-code-light: #3b0764;
    --cat-code-border: #4c1d95;
    --cat-code-bg: #3b0764;
    --cat-security-light: #2e1065;
    --cat-security-border: #3730a3;
    --cat-security-bg: #2e1065;
    --cat-qr-light: #78350f;
    --cat-qr-border: #92400e;
    --cat-qr-bg: #78350f;
}

[data-theme="dark"] .navbar {
    background: var(--bg-nav);
    border-bottom-color: #333;
}

[data-theme="dark"] .navbar-brand-text,
[data-theme="dark"] .tool-name,
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .page-desc,
[data-theme="dark"] .tool-desc {
    color: var(--text-secondary);
}

[data-theme="dark"] .tool-tabs,
[data-theme="dark"] .mode-tabs {
    background: #2a2a2a;
}

[data-theme="dark"] .tool-tab,
[data-theme="dark"] .mode-tab,
[data-theme="dark"] .type-tab {
    color: #888;
}

[data-theme="dark"] .tool-tab.active,
[data-theme="dark"] .mode-tab.active,
[data-theme="dark"] .type-tab.active {
    background: var(--bg-card);
    color: #60a5fa;
}

[data-theme="dark"] .tool-section {
    background: var(--bg-card);
    border-color: var(--border-color);
}

[data-theme="dark"] .tool-page .back-link {
    background: #2a2a2a;
    color: var(--text-secondary);
}

[data-theme="dark"] .tool-page .back-link:hover {
    color: var(--primary-500);
}

[data-theme="dark"] .tool-page h1 {
    color: var(--text-primary);
}

[data-theme="dark"] .trust-bar {
    background: #1a1a1a;
    border-color: var(--border-color);
    color: var(--text-secondary);
}