/* ============================================================
   css/tool-shell.css — 工具子页统一外壳（顶栏 / 底栏 / 版式基线）
   ------------------------------------------------------------
   适用页面：
     · /tools/2026/Palette/   智能调色板
     · /proj/2026/TP/         打字练习

   设计约定：
   1. 与主页同一套 Apple 语汇：白底、#1d1d1f 墨色、#6e6e73 次级、
      #d2d2d7 细线，靠字阶与留白建立层次，不使用彩色装饰。
   2. 顶栏为毛玻璃 sticky bar，底栏为页脚 bar；两者在三个页面
      结构完全一致，只有当前页的 tab 高亮不同。
   3. 本文件只提供外壳与通用组件；各工具的专属版式放在页面
      自己的 <style> 里，避免互相污染。
   4. 不覆盖任何工具原有的 id / class，交互逻辑零改动。
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */

:root {
    --ts-bg: #ffffff;
    --ts-ink: #1d1d1f;
    --ts-ink-2: #6e6e73;
    --ts-ink-3: #86868b;
    --ts-ink-4: #a1a1a6;
    --ts-line: #e6e6ea;
    --ts-line-strong: #d2d2d7;
    --ts-surface: #f5f5f7;
    --ts-surface-2: #fafafa;
    --ts-bar: rgba(255, 255, 255, 0.72);
    --ts-radius-xl: 26px;
    --ts-radius-lg: 20px;
    --ts-radius-md: 14px;
    --ts-radius-sm: 10px;
    --ts-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --ts-shadow-card: 0 1px 2px rgba(0, 0, 0, 0.03), 0 30px 60px -44px rgba(0, 0, 0, 0.28);
    --ts-bar-h: 58px;
    --ts-mono: 'SF Mono', ui-monospace, 'CustomFont', 'Menlo', 'Consolas', monospace;
}

/* ---------- 2. 页面外壳 ---------- */

body.tool {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    background: var(--ts-bg);
    color: var(--ts-ink);
    font-family: var(--font-family);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.tool > main {
    flex: 1 0 auto;
    width: 100%;
}

/* style.css 里的全局链接悬停会整体降透明度，工具页改为颜色过渡 */
body.tool a:hover {
    opacity: 1;
}

body.tool ::selection {
    background: rgba(29, 29, 31, 0.14);
}

/* 键盘焦点统一为细描边，鼠标点击不出现 */
body.tool a:focus-visible,
body.tool button:focus-visible,
body.tool [tabindex]:focus-visible,
body.tool input:focus-visible,
body.tool textarea:focus-visible {
    outline: 2px solid rgba(29, 29, 31, 0.5);
    outline-offset: 3px;
}

/* ---------- 3. 顶栏 ---------- */

.appbar {
    position: sticky;
    top: 0;
    z-index: 900;
    background: var(--ts-bar);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.07);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .appbar {
        background: rgba(255, 255, 255, 0.96);
    }
}

.appbar-in {
    max-width: 1180px;
    height: var(--ts-bar-h);
    margin: 0 auto;
    padding: 0 clamp(16px, 4vw, 40px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 18px;
}

.brand-cluster {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ts-ink);
    text-decoration: none;
    flex-shrink: 0;
}

.brand img {
    display: block;
    width: 20px;
    height: 20px;
}

.brand-name {
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.brand-sep {
    color: #c7c7cc;
    font-size: 0.8125rem;
    flex-shrink: 0;
}

.brand-page {
    font-size: 0.8125rem;
    color: var(--ts-ink-2);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 中部分段控件：三个工具之间快速切换 */
.tabs {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.045);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.tab {
    display: inline-flex;
    align-items: center;
    height: 30px;
    padding: 0 16px;
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    color: #48484d;
    text-decoration: none;
    white-space: nowrap;
    transition: background 0.2s ease, color 0.2s ease;
}

.tab:hover {
    color: var(--ts-ink);
    background: rgba(0, 0, 0, 0.05);
}

.tab.is-active,
.tab.is-active:hover {
    background: var(--ts-ink);
    color: #ffffff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
}

.home-link {
    justify-self: end;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--ts-ink-2);
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.2s ease;
}

.home-link svg {
    width: 14px;
    height: 14px;
    transition: transform 0.3s var(--ts-ease);
}

.home-link:hover {
    color: var(--ts-ink);
}

.home-link:hover svg {
    transform: translateX(3px);
}

/* ---------- 4. 内容容器与页头 ---------- */

.wrap {
    width: 100%;
    max-width: 1020px;
    margin: 0 auto;
    padding: clamp(26px, 4vw, 48px) clamp(18px, 4vw, 40px) clamp(40px, 4.4vw, 52px);
}

.wrap--narrow {
    max-width: 880px;
}

.wrap--wide {
    max-width: 1120px;
}

.pagehead {
    margin: 0 0 clamp(22px, 3vw, 32px);
}

.pagehead-eyebrow {
    margin: 0 0 10px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    color: var(--ts-ink-3);
}

.pagehead-title {
    margin: 0;
    font-size: clamp(1.75rem, 3.6vw, 2.5rem);
    font-weight: 600;
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--ts-ink);
}

.pagehead-sub {
    margin: 12px 0 0;
    max-width: 40em;
    font-size: clamp(0.9375rem, 1.1vw, 1.0625rem);
    line-height: 1.6;
    color: var(--ts-ink-2);
}

/* ---------- 5. 通用卡片与按钮 ---------- */

.card {
    background: #ffffff;
    border: 1px solid var(--ts-line);
    border-radius: var(--ts-radius-xl);
    box-shadow: var(--ts-shadow-card);
}

.btn-primary,
.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    padding: 0 30px;
    border-radius: 999px;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    white-space: nowrap;
    cursor: pointer;
    transition: background 0.22s ease, border-color 0.22s ease, color 0.22s ease, transform 0.12s var(--ts-ease), opacity 0.2s ease;
}

.btn-primary {
    border: 1px solid var(--ts-ink);
    background: var(--ts-ink);
    color: #ffffff;
}

.btn-primary:hover {
    background: #000000;
    border-color: #000000;
}

.btn-primary:active {
    transform: scale(0.975);
}

.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.btn-ghost {
    border: 1px solid var(--ts-line-strong);
    background: transparent;
    color: var(--ts-ink);
}

.btn-ghost:hover {
    background: rgba(0, 0, 0, 0.04);
    border-color: #b9b9bf;
}

.btn-ghost:active {
    transform: scale(0.975);
}

.btn-block {
    width: 100%;
}

/* 小号状态胶囊 */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 30px;
    padding: 0 13px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    background: var(--ts-surface);
    font-size: 0.75rem;
    letter-spacing: 0.02em;
    color: var(--ts-ink-2);
    white-space: nowrap;
}

.chip::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #b9b9bf;
    flex-shrink: 0;
}

/* ---------- 6. 底栏 ---------- */

.shellfoot {
    border-top: 1px solid var(--ts-line);
    background: #fbfbfd;
    font-size: 0.8125rem;
    color: var(--ts-ink-2);
}

.shellfoot-in {
    max-width: 1180px;
    margin: 0 auto;
    padding: 26px clamp(18px, 4vw, 40px) 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 28px;
}

.foot-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--ts-ink);
}

.foot-brand::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ts-ink);
}

.foot-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
}

.foot-links a {
    color: var(--ts-ink-2);
    text-decoration: none;
    transition: color 0.2s ease;
}

.foot-links a:hover {
    color: var(--ts-ink);
}

.foot-meta {
    margin-left: auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 16px;
    font-size: 0.75rem;
    color: var(--ts-ink-3);
}

.foot-meta a {
    color: var(--ts-ink-3);
    text-decoration: none;
    transition: color 0.2s ease;
}

.foot-meta a:hover {
    color: var(--ts-ink);
}

.foot-note {
    max-width: 1180px;
    margin: 14px auto 0;
    padding: 0 clamp(18px, 4vw, 40px) 26px;
    font-size: 0.6875rem;
    line-height: 1.7;
    color: var(--ts-ink-4);
}

/* ---------- 7. 响应式 ---------- */

@media (max-width: 860px) {
    .appbar-in {
        gap: 12px;
    }

    .brand-page,
    .brand-sep {
        display: none;
    }

    .tab {
        padding: 0 13px;
    }
}

@media (max-width: 620px) {
    :root {
        --ts-bar-h: 54px;
        --ts-radius-xl: 22px;
    }

    .appbar-in {
        grid-template-columns: auto 1fr auto;
    }

    .brand-name {
        display: none;
    }

    .tabs {
        justify-self: center;
        padding: 2px;
    }

    .tab {
        height: 28px;
        padding: 0 11px;
        font-size: 0.75rem;
    }

    .home-link span {
        display: none;
    }

    .home-link svg {
        width: 16px;
        height: 16px;
    }

    .wrap {
        padding-top: 26px;
        padding-bottom: 40px;
    }

    .foot-meta {
        margin-left: 0;
        width: 100%;
    }

    .shellfoot-in {
        padding-top: 22px;
        gap: 12px 20px;
    }
}

@media (max-width: 400px) {
    .tab {
        padding: 0 9px;
        font-size: 0.6875rem;
    }
}

/* ---------- 8. 动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
    .tab,
    .home-link svg,
    .btn-primary,
    .btn-ghost,
    .foot-links a,
    .foot-meta a {
        transition: none;
    }

    body.tool * {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
    }
}