/* ==========================================================================
   Tuesday 工具箱 · 设计系统
   独立于博客主站样式：CSS 变量驱动，深色默认，可切浅色
   ========================================================================== */

:root {
    --bg: #0b0e14;
    --bg-grad: radial-gradient(1200px 500px at 50% -200px, rgba(99, 102, 241, .16), transparent 70%);
    --surface: #12161f;
    --surface-2: #171d29;
    --surface-3: #1e2634;
    --border: rgba(148, 163, 184, .14);
    --border-strong: rgba(148, 163, 184, .28);
    --text: #e8edf6;
    --text-2: #a8b3c7;
    --text-3: #6f7b93;
    --brand: #818cf8;
    --brand-2: #6366f1;
    --brand-contrast: #ffffff;
    --brand-soft: rgba(99, 102, 241, .13);
    --grad: linear-gradient(135deg, #8b5cf6, #6366f1 55%, #3b82f6);
    --ok: #34d399;
    --err: #f87171;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 10px 30px -14px rgba(0, 0, 0, .55);
    --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --tr: 160ms cubic-bezier(.4, 0, .2, 1);
    color-scheme: dark;
}

[data-theme="light"] {
    --bg: #f5f6f8;
    --bg-grad: radial-gradient(1200px 500px at 50% -200px, rgba(99, 102, 241, .10), transparent 70%);
    --surface: #ffffff;
    --surface-2: #f6f7fa;
    --surface-3: #eceef4;
    --border: rgba(15, 23, 42, .10);
    --border-strong: rgba(15, 23, 42, .20);
    --text: #171d29;
    --text-2: #4b5568;
    --text-3: #8b93a5;
    --brand: #5b5bd6;
    --brand-2: #4f46e5;
    --brand-contrast: #ffffff;
    --brand-soft: rgba(79, 70, 229, .09);
    --ok: #059669;
    --err: #dc2626;
    --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 10px 30px -16px rgba(15, 23, 42, .18);
    color-scheme: light;
}

/* ---------- 基础 ---------- */

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font: 15px/1.65 var(--sans);
    color: var(--text);
    background-color: var(--bg);
    background-image: var(--bg-grad);
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--brand); text-decoration: none; transition: color var(--tr); }
a:hover { color: var(--brand-2); }

::selection { background: rgba(99, 102, 241, .35); }

:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 2px;
    border-radius: 4px;
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 8px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }
::-webkit-scrollbar-track { background: transparent; }

.container {
    width: 100%;
    max-width: 1060px;
    margin: 0 auto;
    padding: 0 20px;
}

main.container { flex: 1; padding-bottom: 48px; }

/* ---------- 顶栏 ---------- */

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bg) 78%, transparent);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

@supports not (backdrop-filter: blur(14px)) {
    .topbar { background: var(--bg); }
}

.topbar-inner {
    max-width: 1060px;
    margin: 0 auto;
    padding: 0 20px;
    height: 58px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-weight: 700;
    font-size: 16px;
    color: var(--text);
    letter-spacing: .3px;
}
.brand:hover { color: var(--text); }

.brand-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--grad);
    color: #fff;
    box-shadow: 0 2px 8px -2px rgba(99, 102, 241, .6);
}

.topbar-nav { margin-left: auto; display: flex; align-items: center; gap: 8px; }

.nav-link {
    font-size: 14px;
    color: var(--text-2);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: color var(--tr), background var(--tr);
}
.nav-link:hover { color: var(--text); background: var(--brand-soft); }

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-2);
    cursor: pointer;
    transition: color var(--tr), border-color var(--tr), transform var(--tr);
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
.icon-btn:active { transform: scale(.94); }

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }

/* ---------- Hero（首页） ---------- */

.hero {
    text-align: center;
    padding: 72px 0 40px;
}

.hero-badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 22px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12.5px;
    color: var(--text-2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 5px 12px;
}
.badge svg { color: var(--brand); }

.hero-title {
    margin: 0 0 14px;
    font-size: clamp(30px, 5.5vw, 44px);
    font-weight: 800;
    letter-spacing: .5px;
    line-height: 1.25;
}

.hero-title em {
    font-style: normal;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-sub {
    margin: 0 auto 30px;
    max-width: 560px;
    color: var(--text-2);
    font-size: 15.5px;
}

.search-box {
    position: relative;
    max-width: 480px;
    margin: 0 auto;
}

.search-box svg {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-3);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: 13px 16px 13px 42px;
    font: 15px var(--sans);
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow);
    transition: border-color var(--tr), box-shadow var(--tr);
}

.search-box input:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px var(--brand-soft);
}
.search-box input::placeholder { color: var(--text-3); }

/* ---------- 工具卡片区 ---------- */

.tool-section { padding: 8px 0 32px; }

.section-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-3);
    margin: 0 0 14px;
}

.group-title {
    font-size: 16px;
    font-weight: 700;
    margin: 26px 0 12px;
    padding-left: 11px;
    border-left: 3px solid var(--brand);
    line-height: 1.3;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 14px;
}

.tool-card {
    display: flex;
    align-items: flex-start;
    gap: 13px;
    padding: 17px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: transform var(--tr), border-color var(--tr), box-shadow var(--tr);
}

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

.tool-icon {
    flex: none;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--brand-soft);
    color: var(--brand);
}

.tool-body { flex: 1; min-width: 0; }

.tool-name { font-weight: 600; font-size: 15px; margin-bottom: 3px; }

.tool-desc {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
}

.tool-arrow {
    flex: none;
    align-self: center;
    color: var(--text-3);
    transition: transform var(--tr), color var(--tr);
}
.tool-card:hover .tool-arrow { transform: translateX(3px); color: var(--brand); }

.empty {
    text-align: center;
    color: var(--text-3);
    padding: 40px 0;
    font-size: 14px;
}

/* ---------- 工具页通用 ---------- */

.crumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-3);
    padding: 22px 0 0;
}
.crumbs a { color: var(--text-3); }
.crumbs a:hover { color: var(--brand); }
.crumbs b { color: var(--text-2); font-weight: 600; }

.page-head { padding: 18px 0 20px; }

.page-head h1 {
    margin: 0 0 6px;
    font-size: 24px;
    font-weight: 800;
    letter-spacing: .3px;
}

.page-head p { margin: 0; color: var(--text-2); font-size: 14px; }

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 18px;
}

/* 模式切换（分段控件） */

.mode-row { display: flex; justify-content: center; margin-bottom: 18px; }

.segmented {
    display: inline-flex;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 11px;
    padding: 3px;
    gap: 3px;
}

.seg-btn {
    border: none;
    background: transparent;
    color: var(--text-2);
    font: 600 13.5px var(--sans);
    padding: 7px 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--tr), color var(--tr), box-shadow var(--tr);
    white-space: nowrap;
}

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

.seg-btn.active {
    background: var(--grad);
    color: var(--brand-contrast);
    box-shadow: 0 2px 8px -2px rgba(99, 102, 241, .55);
}

/* 选项区 */

.options { margin-bottom: 14px; }

.opt-label {
    font-size: 12.5px;
    color: var(--text-3);
    margin-bottom: 8px;
}

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }

.chip {
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text-2);
    font: 600 12.5px var(--mono);
    padding: 5px 12px;
    border-radius: 999px;
    cursor: pointer;
    transition: all var(--tr);
}
.chip:hover { border-color: var(--border-strong); color: var(--text); }

.chip.active {
    background: var(--brand-soft);
    border-color: var(--brand);
    color: var(--brand);
}

.opt-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.opt-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-2);
}

.opt-item select {
    font: 13px var(--sans);
    color: var(--text);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    cursor: pointer;
    transition: border-color var(--tr);
}
.opt-item select:hover { border-color: var(--border-strong); }
.opt-item select:focus { outline: none; border-color: var(--brand); }

.hint {
    margin: 10px 0 0;
    font-size: 12.5px;
    color: var(--text-3);
    line-height: 1.7;
}

/* 输入 / 输出区 */

.io-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.io-title { font-size: 13px; font-weight: 700; color: var(--text-2); }

.io-count { font: 12px var(--mono); color: var(--text-3); margin-left: auto; }
.io-count.over { color: var(--err); font-weight: 700; }

.io-status {
    font-size: 12px;
    color: var(--brand);
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.io-status[hidden] { display: none; }

.io-status::before {
    content: "";
    width: 10px;
    height: 10px;
    border: 2px solid var(--brand);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin .8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
    .io-status::before { animation: none; }
    .tool-card, .tool-arrow, .chip, .btn, .seg-btn, .icon-btn { transition: none; }
}

.io-text {
    width: 100%;
    resize: vertical;
    min-height: 120px;
    padding: 13px 15px;
    font: 14px/1.7 var(--mono);
    color: var(--text);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--tr), box-shadow var(--tr);
}

.io-text:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px var(--brand-soft);
}
.io-text::placeholder { color: var(--text-3); }

.io-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 12px; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font: 600 13px var(--sans);
    color: var(--text-2);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 7px 14px;
    cursor: pointer;
    transition: all var(--tr);
}
.btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--surface-3); }
.btn:active { transform: scale(.97); }
.btn svg { flex: none; }

.btn-primary {
    background: var(--grad);
    border-color: transparent;
    color: var(--brand-contrast);
    box-shadow: 0 2px 10px -3px rgba(99, 102, 241, .6);
}
.btn-primary:hover { color: var(--brand-contrast); filter: brightness(1.08); background: var(--grad); }

/* 输出展示 */

.io-output {
    min-height: 120px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px;
    overflow-x: auto;
}

.output-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 108px;
    color: var(--text-3);
    font-size: 13.5px;
}

.output-error {
    display: block;
    color: var(--err);
    font-size: 13px;
    padding: 14px;
}

/* 对照表 */

.cs-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.cs-table th, .cs-table td {
    border-bottom: 1px solid var(--border);
    padding: 7px 10px;
    text-align: left;
    white-space: nowrap;
}

.cs-table tr:last-child td { border-bottom: none; }

.cs-table th {
    font: 600 11.5px var(--mono);
    color: var(--text-3);
    letter-spacing: .5px;
}

.cs-table td.char-cell {
    font-size: 17px;
    font-weight: 600;
    min-width: 34px;
}

.cs-table td.code-cell {
    font-family: var(--mono);
    color: var(--text);
    cursor: copy;
    border-radius: 6px;
    transition: background var(--tr);
}
.cs-table td.code-cell:hover { background: var(--brand-soft); }

.cs-table td.miss { color: var(--text-3); opacity: .6; }
.cs-table td.bad { color: var(--err); }

/* 连续编码布局 */

.cs-line {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 8px 10px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}
.cs-line:last-child { border-bottom: none; }

.cs-line .cs-name {
    flex: none;
    width: 86px;
    font: 600 12px var(--mono);
    color: var(--text-3);
}

.cs-line .cs-value {
    font: 13.5px var(--mono);
    word-break: break-all;
    cursor: copy;
    border-radius: 6px;
    transition: background var(--tr);
}
.cs-line .cs-value:hover { background: var(--brand-soft); }

/* 反查结果卡片 */

.char-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
}

.char-card {
    width: 84px;
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 6px 8px;
}

.char-card .cc-char {
    font-size: 26px;
    font-weight: 600;
    line-height: 1.4;
    min-height: 37px;
    word-break: break-all;
}

.char-card .cc-code {
    font: 11px var(--mono);
    color: var(--text-3);
    margin-top: 3px;
    word-break: break-all;
}

.char-card.invalid { border-color: var(--err); }
.char-card.invalid .cc-char {
    font-size: 12px;
    color: var(--err);
    font-weight: 500;
}

/* 帮助区 */

.help {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    margin-bottom: 18px;
    overflow: hidden;
}

.help summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 18px;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-2);
    display: flex;
    align-items: center;
    gap: 8px;
}
.help summary::-webkit-details-marker { display: none; }
.help summary::before {
    content: "›";
    color: var(--text-3);
    transition: transform var(--tr);
    font-size: 16px;
    line-height: 1;
}
.help[open] summary::before { transform: rotate(90deg); }

.help-body {
    padding: 2px 18px 16px;
    font-size: 13.5px;
    color: var(--text-2);
    line-height: 1.9;
}

.help-body h4 {
    margin: 12px 0 2px;
    font-size: 13px;
    color: var(--text);
}

.help-body code {
    font: 12px var(--mono);
    background: var(--surface-3);
    border-radius: 4px;
    padding: 1px 6px;
}

/* 复制成功的浮层提示 */

.toast {
    position: fixed;
    left: 50%;
    bottom: 34px;
    transform: translateX(-50%) translateY(8px);
    background: var(--surface-3);
    border: 1px solid var(--border-strong);
    color: var(--text);
    font-size: 13px;
    padding: 8px 18px;
    border-radius: 999px;
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
    z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 页脚 ---------- */

.footer { border-top: 1px solid var(--border); padding: 20px 0; margin-top: 30px; }

.footer-inner {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 12.5px;
    color: var(--text-3);
}

.footer a { color: var(--text-2); }
.footer a:hover { color: var(--brand); }

/* ---------- 响应式 ---------- */

@media (max-width: 640px) {
    .hero { padding: 44px 0 28px; }
    .page-head h1 { font-size: 20px; }
    .panel { padding: 14px; border-radius: var(--radius); }
    .seg-btn { padding: 7px 12px; }
    .tool-grid { grid-template-columns: 1fr; }
    .cs-table td.char-cell { font-size: 15px; }
    .footer-inner { justify-content: center; text-align: center; }
}