@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('../fonts/JetBrainsMono/JetBrainsMono-Regular.woff2') format('woff2'),
         url('../fonts/JetBrainsMono/JetBrainsMono-Regular.woff') format('woff');
}

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('../fonts/JetBrainsMono/JetBrainsMono-Bold.woff2') format('woff2'),
         url('../fonts/JetBrainsMono/JetBrainsMono-Bold.woff') format('woff');
}

@font-face {
    font-family: 'Fira Code';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('../fonts/FiraCode/FiraCode-Regular.woff2') format('woff2'),
         url('../fonts/FiraCode/FiraCode-Regular.woff') format('woff');
}

@font-face {
    font-family: 'Fira Code';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('../fonts/FiraCode/FiraCode-Bold.woff2') format('woff2'),
         url('../fonts/FiraCode/FiraCode-Bold.woff') format('woff');
}

@font-face {
    font-family: 'Alibaba PuHuiTi';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('../fonts/AlibabaPuHuiTi/AlibabaPuHuiTi-2-55-Regular.woff2') format('woff2');
}

@font-face {
    font-family: 'Alibaba PuHuiTi';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('../fonts/AlibabaPuHuiTi/AlibabaPuHuiTi-2-85-Bold.woff2') format('woff2');
}

:root {
    color-scheme: light;
    --bg: #ffffff;
    --surface: #f8f8f8;
    --text: #111111;
    --text-muted: #666666;
    --border: #e0e0e0;
    --accent: #3b82f6;
    --accent-2: #93c5fd;
    --radius: 0;
    --font: 'Alibaba PuHuiTi', system-ui, -apple-system, 'Segoe UI', 'Noto Sans SC', sans-serif, 'JetBrains Mono', 'Fira Code', 'Cascadia Code', ui-monospace, monospace;
}

:root.dark {
    color-scheme: dark;
    --bg: #0f0f0f;
    --surface: #1a1a1a;
    --text: #e8e8e8;
    --text-muted: #999999;
    --border: #2a2a2a;
}

* {
    box-sizing: border-box;
}

html, body {
    min-height: 100%;
}

body {
    margin: 0;
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    background: var(--bg);
    color: var(--text);
    overscroll-behavior: none;
}

button, input, select, textarea {
    font: inherit;
}

/* 页面整体布局 */
.page-shell {
    display: flex;
    min-height: 100vh;
}

/* 左侧边栏 */
.sidebar {
    width: 220px;
    min-width: 220px;
    border-right: 1px solid var(--border);
    background: var(--surface);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    padding: 24px 16px;
    z-index: 50;
    overflow-y: hidden;
    display: flex;
    flex-direction: column;
}

/* 右侧主区域 */
.main-area {
    flex: 1;
    margin-left: 220px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 顶部固定横幅导航 */
.topbar {
    position: fixed;
    top: 0;
    left: 220px;
    right: 0;
    z-index: 100;
    background: var(--surface);
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    max-width: 760px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.nav-home-link {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.85rem;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}

.nav-home-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}

.icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.text-btn {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.85rem;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}

.text-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.icon-sun, .icon-moon {
    display: none;
}

:root .icon-sun {
    display: block;
}

:root.dark .icon-sun {
    display: none;
}

:root.dark .icon-moon {
    display: block;
}

.topbar-search {
    display: flex;
    align-items: center;
    max-width: 360px;
    width: 100%;
    height: 36px;
    background: var(--bg);
    border: 1px solid var(--border);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.topbar-banner {
    display: flex;
    align-items: center;
    padding: 0 10px;
    margin-left: auto;
    height: 100%;
    border-left: 1px solid var(--border);
    transition: background 0.2s;
}

.topbar-banner:hover {
    background: var(--surface);
}

.topbar-banner img {
    height: 20px;
    width: auto;
}

.topbar-search:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

.topbar-search input {
    flex: 1;
    height: 100%;
    padding: 0 12px;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 0.9rem;
}

.topbar-search input:focus {
    outline: none;
}

.topbar-search input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    height: 100%;
    padding: 0 12px;
    border: none;
    border-left: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    transition: color 0.2s;
}

.search-btn:hover {
    color: var(--accent);
}

/* 主内容区域 */
.page-content {
    flex: 1;
    padding: 24px;
    margin-top: 53px;
    overflow: auto;
}

.sidebar-header {
    margin-bottom: 20px;
}

.brand-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.brand-sub {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.brand-link {
    text-decoration: none;
    color: inherit;
}

.brand-link:hover .brand {
    color: var(--accent);
}

.copy-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    padding: 10px 14px;
    margin-top: 16px;
    cursor: pointer;
}

.copy-button.copied {
    border-color: var(--accent);
    color: var(--accent);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex-shrink: 0;
}

.sidebar-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-group-title {
    margin: 0 0 6px;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.nav-item {
    margin-bottom: 2px;
}

.nav-item a {
    display: block;
    padding: 6px 8px;
    line-height: 1.4;
    height: auto;
    color: var(--text);
    text-decoration: none;
    background: transparent;
}

.nav-item.active a,
.nav-item a:hover {
    background: var(--bg);
    color: var(--accent);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.75rem;
    text-align: center;
}

.sidebar-footer p {
    margin: 0 0 4px;
}

.tool-page {
    max-width: 980px;
    margin: 0 auto;
}

.tool-header .eyebrow {
    margin: 0 0 12px;
    color: var(--accent);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.tool-header h1 {
    margin: 0 0 8px;
    font-size: clamp(2rem, 2.4vw, 2.6rem);
}

.intro {
    margin: 0;
    color: var(--text-muted);
    max-width: 700px;
}

.tool-block {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 22px;
    margin-top: 24px;
}

.tool-block h2 {
    margin-top: 0;
}

.tool-list,
.feature-list {
    margin: 16px 0 0;
    padding-left: 20px;
    color: var(--text);
}

.tool-list li,
.feature-list li {
    margin-bottom: 12px;
}

.field-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.field-group label {
    display: grid;
    gap: 8px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.field-group input,
.field-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
}

.result-panel {
    margin-top: 24px;
    padding: 18px;
    border: 1px solid var(--border);
    background: var(--bg);
}

.result-panel .result-item {
    display: grid;
    gap: 8px;
    margin-bottom: 16px;
}

.result-panel .result-item:last-child {
    margin-bottom: 0;
}

/* 表单组件 */
.form-group {
    margin-bottom: 16px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.form-group .input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
}

.form-group select.input {
    cursor: pointer;
}

.form-row {
    display: flex;
    align-items: flex-end;
    gap: 16px;
    flex-wrap: wrap;
}

.form-row .input {
    padding: 10px 12px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

/* 宽度类 */
.w-24 { width: 96px; }
.w-32 { width: 128px; }
.w-full { width: 100%; }

/* Flex 类 */
.flex-1 { flex: 1; }
.self-center { align-self: center; }
.self-end { align-self: flex-end; }

/* Margin 类 */
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mb-1 { margin-bottom: 4px; }

/* 文字颜色 */
.text-muted { color: var(--text-muted); }

/* 按钮 */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    font-size: 1.2rem;
    transition: border-color 0.2s, color 0.2s;
}

.btn-icon:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.coverage-bar {
    display: flex;
    align-items: center;
    min-height: 22px;
    margin: 8px 0;
    padding-left: 12px;
    border: 1px solid var(--border);
    background: rgba(59, 130, 246, 0.08);
    color: var(--text);
    font-size: 0.95rem;
    overflow: hidden;
}

#area-bars {
    display: grid;
    gap: 8px;
}

.coverage-bar span {
    white-space: nowrap;
}

.coverage-bar.srgb {
    width: 40%;
    background: rgba(59, 130, 246, 0.18);
}

.coverage-bar.p3 {
    width: 75%;
    background: rgba(190, 242, 100, 0.18);
}

.coverage-bar.rec2020 {
    width: 100%;
    background: rgba(255, 255, 255, 0.12);
}

.result-value {
    color: var(--accent);
    font-size: 1.15rem;
    word-break: break-all;
}

.code-block {
    font-family: var(--font);
    background: rgba(59, 130, 246, 0.08);
    padding: 14px;
    border-radius: 0;
    border: 1px solid var(--border);
    overflow-x: auto;
}

@media (max-width: 900px) {
    .sidebar {
        width: 100%;
        min-width: 0;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border);
        height: auto;
    }

    .main-area {
        margin-left: 0;
    }

    .topbar {
        left: 0;
        right: 0;
    }

    .page-content {
        padding: 16px;
        margin-top: 53px;
    }
}

@media (max-width: 640px) {
    body {
        font-size: 14px;
    }

    .sidebar {
        padding: 18px 12px;
    }

    .topbar {
        padding: 8px 12px;
    }

    .topbar-search {
        max-width: 100%;
    }

    .page-content {
        padding: 16px 12px;
    }
}

/* 快速导航网格布局 */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 16px;
}

.tool-group h3 {
    margin: 0 0 12px;
    padding-bottom: 8px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-bottom: 2px solid var(--border);
}

.tool-group ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.tool-group li {
    margin-bottom: 10px;
}

.tool-group a {
    color: var(--text);
    text-decoration: none;
    padding: 4px 0;
    display: inline-block;
    transition: color 0.15s;
}

.tool-group a:hover {
    color: var(--accent);
}

/* 级别标签颜色 */
.tool-level.level-convert {
    color: #22c55e;
    border-color: #22c55e;
}

.tool-level.level-calc {
    color: #3b82f6;
    border-color: #3b82f6;
}

.tool-level.level-check {
    color: #a855f7;
    border-color: #a855f7;
}

:root.dark .tool-level.level-convert {
    color: #4ade80;
}

:root.dark .tool-level.level-calc {
    color: #60a5fa;
}

:root.dark .tool-level.level-check {
    color: #c084fc;
}

@media (max-width: 640px) {
    .tool-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* 下拉菜单 */
.dropdown {
    position: relative;
}

.dropdown-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
    z-index: 100;
    overflow: hidden;
}

:root.dark .dropdown-menu {
    background: var(--surface);
}

.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    color: var(--text);
    text-decoration: none;
    transition: background 0.15s;
}

.dropdown-item:hover {
    background: var(--hover);
}

.dropdown-item:first-child {
    border-radius: 8px 8px 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 8px 8px;
}

.dropdown-item-icon {
    font-size: 16px;
}

:root.dark .dropdown-menu {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}