/* ===== tool.82377.com - Online Tools Website ===== */
/* CSS Variables */
:root {
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --primary-bg: #eef2ff;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --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;
    --radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ===== Header ===== */
.header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    gap: 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}
.logo-icon { font-size: 24px; }
.search-wrap {
    flex: 1;
    max-width: 500px;
    position: relative;
}
.search-input {
    width: 100%;
    height: 40px;
    border: 2px solid var(--gray-200);
    border-radius: 20px;
    padding: 0 40px 0 16px;
    font-size: 14px;
    transition: border-color .2s;
    background: var(--gray-50);
}
.search-input:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
}
.search-btn {
    position: absolute;
    right: 4px;
    top: 4px;
    width: 32px;
    height: 32px;
    border: none;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}
.nav-links {
    display: flex;
    gap: 16px;
    align-items: center;
}
.nav-links a {
    color: var(--gray-600);
    font-size: 14px;
    font-weight: 500;
}
.nav-links a:hover { color: var(--primary); }

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 60px 20px;
    text-align: center;
}
.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}
.hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 24px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 32px;
}
.hero-stat {
    text-align: center;
}
.hero-stat-num {
    font-size: 1.8rem;
    font-weight: 700;
}
.hero-stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===== Category Tabs ===== */
.category-tabs {
    max-width: 1200px;
    margin: -30px auto 0;
    padding: 0 20px;
    position: relative;
    z-index: 10;
}
.category-tabs-inner {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 12px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}
.cat-tab {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--gray-600);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius);
    transition: all .2s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.cat-tab:hover { background: var(--primary-bg); color: var(--primary); }
.cat-tab.active { background: var(--primary); color: #fff; }
.cat-tab-icon { font-size: 18px; }

/* ===== Tools Grid ===== */
.tools-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}
.tool-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    transition: all .25s;
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}
.tool-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
    transform: translateY(-2px);
}
.tool-card-icon {
    font-size: 28px;
    flex-shrink: 0;
    line-height: 1;
}
.tool-card-body { flex: 1; min-width: 0; }
.tool-card-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}
.tool-card-desc {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== Search Results ===== */
.search-results { display: none; }
.search-results.active { display: block; }
.search-results .tools-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-400);
}
.no-results-icon { font-size: 48px; margin-bottom: 16px; }

/* ===== Footer ===== */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 40px 20px 20px;
    margin-top: 60px;
}
.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 24px;
}
.footer-col h4 {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}
.footer-col a {
    display: block;
    color: var(--gray-400);
    font-size: 13px;
    margin-bottom: 8px;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
}
.footer-bottom a { color: var(--gray-400); }

/* ===== Tool Detail Page ===== */
.tool-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 30px 20px;
}
.tool-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}
.tool-header-icon { font-size: 40px; }
.tool-header-info h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-800);
}
.tool-header-info p {
    font-size: 14px;
    color: var(--gray-500);
}
.tool-breadcrumb {
    font-size: 13px;
    color: var(--gray-400);
    margin-bottom: 20px;
}
.tool-breadcrumb a { color: var(--gray-500); }
.tool-breadcrumb span { margin: 0 8px; }
.tool-container {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}
.tool-section-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}
.tool-input-area, .tool-output-area {
    width: 100%;
    min-height: 120px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    padding: 12px;
    font-size: 14px;
    resize: vertical;
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    line-height: 1.5;
}
.tool-input-area:focus, .tool-output-area:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.tool-btn-group {
    display: flex;
    gap: 8px;
    margin: 16px 0;
    flex-wrap: wrap;
}
.btn {
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    transition: all .2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}
.btn-secondary:hover { background: var(--gray-200); }
.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-sm { padding: 4px 12px; font-size: 12px; }
.btn-lg { padding: 12px 32px; font-size: 16px; }

/* Tool Options */
.tool-options {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.tool-option {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
}
.tool-option label { color: var(--gray-600); }
.tool-option input[type="text"], .tool-option input[type="number"], .tool-option select {
    height: 36px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    padding: 0 12px;
    font-size: 14px;
}
.tool-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* File Upload */
.file-upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all .2s;
}
.file-upload-area:hover, .file-upload-area.dragover {
    border-color: var(--primary);
    background: var(--primary-bg);
}
.file-upload-area p { color: var(--gray-500); font-size: 14px; }
.file-upload-area .upload-icon { font-size: 36px; margin-bottom: 8px; }
.file-info {
    margin-top: 12px;
    padding: 8px 12px;
    background: var(--gray-100);
    border-radius: var(--radius);
    font-size: 13px;
    display: none;
}
.file-info.show { display: block; }

/* Result Display */
.tool-result {
    margin-top: 16px;
    padding: 16px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    min-height: 60px;
    font-size: 14px;
    word-break: break-all;
}
.tool-result.empty { color: var(--gray-400); }
.result-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-100);
}
.result-item:last-child { border-bottom: none; }
.result-label { font-weight: 600; color: var(--gray-700); }
.result-value { color: var(--gray-600); }

/* Copy Button */
.copy-btn {
    position: relative;
    margin-left: auto;
}

/* Tab Interface */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 2px solid var(--gray-200);
}
.tab {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--gray-500);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}
.tab.active { color: var(--primary); border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--gray-800);
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    opacity: 0;
    transition: all .3s;
    z-index: 9999;
    pointer-events: none;
}
.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Related Tools */
.related-tools {
    margin-top: 32px;
}
.related-tools h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}
.related-tools .tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

/* Responsive */
@media (max-width: 768px) {
    .header-inner { flex-wrap: wrap; gap: 12px; }
    .search-wrap { order: 3; max-width: 100%; }
    .nav-links { display: none; }
    .hero h1 { font-size: 1.5rem; }
    .hero-stats { gap: 24px; }
    .tools-grid { grid-template-columns: 1fr; }
    .category-tabs-inner { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; }
    .tool-options { flex-direction: column; align-items: flex-start; }
}

/* Back to Top */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    border: none;
    transition: all .2s;
}
.back-top:hover { background: var(--primary-dark); transform: translateY(-2px); }
.back-top.show { display: flex; }

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Image preview */
.image-preview {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius);
    margin-top: 12px;
    display: none;
}
.image-preview.show { display: inline-block; }

/* Code Block */
.code-block {
    background: var(--gray-900);
    color: #e5e7eb;
    padding: 16px;
    border-radius: var(--radius);
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    font-size: 13px;
    overflow-x: auto;
    margin-top: 12px;
    position: relative;
}
.code-block pre { margin: 0; white-space: pre-wrap; word-break: break-all; }

/* Checkboxes Group */
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}
.checkbox-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--gray-100);
    border-radius: var(--radius);
    font-size: 14px;
    cursor: pointer;
}
.checkbox-item input { margin: 0; }

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 8px;
}
.progress-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width .3s;
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

/* Color Picker */
input[type="color"] {
    width: 50px;
    height: 36px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    cursor: pointer;
}

/* Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
    font-size: 14px;
}
.data-table th, .data-table td {
    border: 1px solid var(--gray-200);
    padding: 8px 12px;
    text-align: left;
}
.data-table th { background: var(--gray-100); font-weight: 600; }
.data-table tr:nth-child(even) { background: var(--gray-50); }