/* ============================================
   在线工具箱 — 设计系统
   ============================================ */

/* --- Google Fonts 异步加载 --- */
@font-face {
    font-family: 'Outfit';
    font-style: normal;
    font-weight: 400 700;
    font-display: swap;
    src: url(https://fonts.font.im/css2?family=Outfit:wght@400;500;600;700&display=swap);
}

/* --- 设计 Token --- */
:root {
    /* 色彩 */
    --color-primary: #0d9488;
    --color-primary-hover: #0f766e;
    --color-primary-light: #ccfbf1;
    --color-primary-ring: rgba(13, 148, 136, 0.25);
    --color-heading: #0f172a;
    --color-text: #334155;
    --color-muted: #64748b;
    --color-bg: #f8fafc;
    --color-card: #ffffff;
    --color-border: #e2e8f0;
    --color-border-focus: #0d9488;
    --color-success: #059669;
    --color-success-hover: #047857;
    --color-danger: #dc2626;

    /* 类别色 */
    --color-cat-image: #0891b2;
    --color-cat-pdf: #dc2626;
    --color-cat-dev: #7c3aed;
    --color-cat-text: #d97706;

    /* 圆角 */
    --radius-card: 12px;
    --radius-btn: 8px;
    --radius-input: 8px;
    --radius-badge: 6px;

    /* 阴影 */
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-nav: 0 1px 0 var(--color-border);

    /* 动效 */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;

    /* 字体 */
    --font-display: 'Outfit', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    --font-body: 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
}

/* --- 基础排版 --- */
body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--color-heading);
}

/* --- 导航栏 --- */
.navbar {
    background: var(--color-card);
    box-shadow: var(--shadow-nav);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.95);
}

.navbar .nav-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: opacity var(--transition-fast);
}

.navbar .nav-logo:hover {
    opacity: 0.8;
}

.navbar .nav-logo svg {
    width: 24px;
    height: 24px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-muted);
    text-decoration: none;
    padding: 0.375rem 0.625rem;
    border-radius: var(--radius-btn);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}

.nav-links a:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.nav-links a.active {
    color: var(--color-primary);
    font-weight: 600;
}

.nav-divider {
    width: 1px;
    height: 16px;
    background: var(--color-border);
    margin: 0 0.25rem;
}

/* 移动端导航菜单按钮 */
.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-btn);
    transition: background var(--transition-fast);
}

.nav-mobile-toggle:hover {
    background: var(--color-bg);
}

@media (max-width: 768px) {
    .nav-mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-card);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        padding: 0.5rem;
        flex-direction: column;
        gap: 0.125rem;
    }
    .nav-links.open {
        display: flex;
    }
    .nav-links a {
        width: 100%;
        padding: 0.625rem 1rem;
    }
    .nav-divider {
        width: 100%;
        height: 1px;
        margin: 0.25rem 0;
    }
}

/* --- 卡片 --- */
.tool-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    text-decoration: none;
    display: block;
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal), transform var(--transition-normal);
}

.tool-card:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.tool-card .card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    transition: transform var(--transition-normal);
}

.tool-card:hover .card-icon {
    transform: scale(1.05);
}

.tool-card .card-icon img {
    width: 100%;
    height: 100%;
}

.tool-card .card-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 0.375rem;
}

.tool-card .card-desc {
    font-size: 0.875rem;
    color: var(--color-muted);
    line-height: 1.5;
}

/* --- 分类标签 --- */
.category-badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-badge);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.category-badge.cat-image {
    background: #ecfeff;
    color: var(--color-cat-image);
}

.category-badge.cat-pdf {
    background: #fef2f2;
    color: var(--color-cat-pdf);
}

.category-badge.cat-dev {
    background: #f5f3ff;
    color: var(--color-cat-dev);
}

.category-badge.cat-text {
    background: #fffbeb;
    color: var(--color-cat-text);
}

/* --- 最近使用卡片（紧凑型） --- */
.recent-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 1rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.recent-card:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary);
}

.recent-card img {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.recent-card span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

/* --- 按钮 --- */
.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
    font-weight: 500;
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-btn);
    border: none;
    cursor: pointer;
    font-size: 0.9375rem;
    transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
    font-family: var(--font-body);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.3);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-success {
    background: var(--color-success);
    color: #ffffff;
    font-weight: 500;
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-btn);
    border: none;
    cursor: pointer;
    font-size: 0.9375rem;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
    font-family: var(--font-body);
}

.btn-success:hover {
    background: var(--color-success-hover);
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-btn);
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 0.875rem;
    transition: background var(--transition-fast), border-color var(--transition-fast);
    font-family: var(--font-body);
}

.btn-secondary:hover {
    background: var(--color-border);
}

.btn-danger-text {
    background: none;
    border: none;
    color: var(--color-danger);
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-btn);
    transition: background var(--transition-fast);
    font-family: var(--font-body);
}

.btn-danger-text:hover {
    background: #fef2f2;
}

/* --- 输入框 --- */
.input {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-input);
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    color: var(--color-text);
    background: var(--color-card);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    font-family: var(--font-body);
    outline: none;
}

.input:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-ring);
}

.input::placeholder {
    color: #94a3b8;
}

.select {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-input);
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    color: var(--color-text);
    background: var(--color-card);
    cursor: pointer;
    transition: border-color var(--transition-fast);
    font-family: var(--font-body);
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M2.5 4.5l3.5 3.5 3.5-3.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.select:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-ring);
}

/* --- 搜索框 --- */
.search-wrapper {
    position: relative;
    max-width: 560px;
    margin: 0 auto 2rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-card);
    box-shadow: var(--shadow-card);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    font-family: var(--font-body);
    outline: none;
}

.search-input:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-ring), var(--shadow-card);
}

.search-input::placeholder {
    color: #94a3b8;
}

/* --- 上传区 --- */
.upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-card);
    padding: 3rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-normal), background var(--transition-normal);
    background: var(--color-card);
}

.upload-zone:hover {
    border-color: var(--color-primary);
    background: #f0fdfa;
}

.upload-zone.dragover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.upload-zone .upload-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    color: var(--color-primary);
    opacity: 0.7;
}

.upload-zone .upload-text {
    color: var(--color-text);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.upload-zone .upload-hint {
    color: var(--color-muted);
    font-size: 0.875rem;
}

/* --- 滑块 --- */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: 3px solid var(--color-card);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.3);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: 3px solid var(--color-card);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

/* --- 控制面板卡片 --- */
.control-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 1.5rem;
}

.control-card .control-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 1rem;
}

/* --- 预览区 --- */
.preview-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 0.75rem;
}

.preview-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-muted);
    margin-bottom: 0.375rem;
}

.preview-box {
    background: var(--color-bg);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    max-height: 280px;
}

.preview-box img {
    max-height: 260px;
    width: auto;
    object-fit: contain;
}

@media (min-width: 768px) {
    .preview-box {
        max-height: 320px;
    }
    .preview-box img {
        max-height: 300px;
    }
}

/* --- 页脚 --- */
.site-footer {
    background: var(--color-card);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.footer-col-title {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.footer-col a {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-muted);
    text-decoration: none;
    padding: 0.2rem 0;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 1rem;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-muted);
}

/* --- 分类筛选标签（首页） --- */
.filter-tabs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    max-width: 896px;
    margin: 0 auto 1.5rem;
    flex-wrap: wrap;
}

.filter-tab {
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.375rem 0.875rem;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-card);
    color: var(--color-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.filter-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.filter-tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #ffffff;
}

/* --- 章节标题 --- */
.section-label {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
    max-width: 896px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-label svg {
    width: 16px;
    height: 16px;
    opacity: 0.6;
}

/* --- SEO 内容区 --- */
.seo-section {
    max-width: 672px;
    margin: 2rem auto 0;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-text);
}

.seo-section h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
    color: var(--color-heading);
}

.seo-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 1.25rem 0 0.5rem;
    color: var(--color-heading);
}

.seo-section ol, .seo-section ul {
    padding-left: 1.25rem;
    margin-bottom: 1rem;
}

.seo-section li {
    margin-bottom: 0.375rem;
}

.seo-section p {
    margin-bottom: 0.75rem;
}

.seo-section code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-bg);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    border: 1px solid var(--color-border);
}

/* --- 详情页内容居中 --- */
.tool-page main > div[id],
.tool-page main > .control-card,
.tool-page main > .preview-card,
.tool-page main > section {
    margin-left: auto;
    margin-right: auto;
}

/* 画布/预览区域约束 */
.tool-page #cropArea,
.tool-page #previewArea {
    max-width: 640px;
}

.tool-page #cropArea canvas,
.tool-page #previewArea canvas {
    max-width: 100%;
    height: auto;
}

@media (max-width: 640px) {
    .tool-page #cropArea,
    .tool-page #previewArea {
        max-width: 100%;
    }
}

/* --- 页面标题区 --- */
.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--color-muted);
    font-size: 1rem;
}

/* --- 广告位占位 --- */
.ad-slot {
    opacity: 0.5;
}

/* --- 成功/结果区域 --- */
.result-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: var(--radius-card);
    padding: 1.5rem;
    text-align: center;
}

.result-success .result-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.result-success .result-text {
    color: #166534;
    font-weight: 500;
    margin-bottom: 1rem;
}

/* --- JSON 树形视图样式 --- */
.json-key { color: #0d9488; font-weight: 500; }
.json-string { color: #059669; }
.json-number { color: #2563eb; }
.json-boolean { color: #d97706; }
.json-null { color: #94a3b8; }
.json-toggle { cursor: pointer; user-select: none; }
.json-toggle:hover { background: var(--color-bg); border-radius: 3px; }
.json-collapsed .json-bracket-end,
.json-collapsed .json-ellipsis { display: inline; }
.json-collapsed .json-children { display: none; }
.json-bracket-end { display: none; }
.json-ellipsis { display: none; color: #94a3b8; }

/* --- 减少动效偏好 --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* --- 移动端广告位适配 --- */
@media (max-width: 640px) {
    .ad-slot .ad-banner {
        width: 320px;
        height: 50px;
    }
    .ad-sidebar {
        display: none;
    }
    .page-header h1 {
        font-size: 1.5rem;
    }
    .upload-zone {
        padding: 2rem 1rem;
    }
    .upload-zone .upload-icon {
        width: 40px;
        height: 40px;
    }
    .preview-card {
        padding: 0.5rem;
    }
}

/* --- 焦点可见性 --- */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}