/* ============================================================
   zhangshisan.cn 工具页共享主题
   克制、现代的个人站点设计语言：
   - 近单色 + 单一蓝色强调色，无渐变、无光晕
   - 实线 1px 分隔，扁平表面，小圆角
   - 等宽字体用于标签与数字
   ============================================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --accent: #1e56c8;
    --accent-strong: #1744a4;
    --accent-2: #0f766e;
    --ok: #16a34a;
    --warn: #b45309;
    --danger: #dc2626;
    --radius: 12px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --mono: ui-monospace, SFMono-Regular, Consolas, 'Courier New', monospace;
}

[data-theme="dark"] {
    --bg: #09090b;
    --bg-soft: #101012;
    --bg-softer: #16161a;
    --card: #101012;
    --card-hover: #17171a;
    --border: #202024;
    --border-strong: #2e2e35;
    --text: #f2f2f4;
    --text-2: #a3a3ac;
    --text-3: #6d6d77;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
    --accent: #6f9dff;
    --accent-strong: #8bb0ff;
    --accent-2: #3ec4b4;
    --ok: #4ade80;
    --warn: #e0b062;
    --danger: #f87171;
    --code-bg: #121216;
}

[data-theme="light"] {
    --bg: #ffffff;
    --bg-soft: #ffffff;
    --bg-softer: #f4f4f6;
    --card: #ffffff;
    --card-hover: #fafafa;
    --border: #e9e9ec;
    --border-strong: #d5d5db;
    --text: #0f0f11;
    --text-2: #55555f;
    --text-3: #8d8d96;
    --shadow: 0 1px 2px rgba(20, 20, 30, 0.06);
    --accent: #2558d8;
    --accent-strong: #1c46b4;
    --accent-2: #0f766e;
    --ok: #16a34a;
    --warn: #9a6b12;
    --danger: #dc2626;
    --code-bg: #f6f6f8;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background 0.2s ease, color 0.2s ease;
}

[data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }

::selection { background: rgba(110, 162, 255, 0.28); }

/* ============ 顶部导航 ============ */
.z-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.z-nav-inner {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0.7rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.z-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--text);
    min-width: 0;
}

.z-brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: var(--text);
    color: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.95rem;
    flex-shrink: 0;
}

.z-brand-text { font-weight: 650; font-size: 0.95rem; letter-spacing: -0.01em; white-space: nowrap; }
.z-brand-text span { color: var(--text-3); font-weight: 450; }

.z-nav-actions { display: flex; align-items: center; gap: 0.35rem; }

.z-nav-link {
    color: var(--text-2);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.4rem 0.75rem;
    border-radius: 7px;
    transition: color 0.15s, background 0.15s;
    white-space: nowrap;
}

.z-nav-link:hover { color: var(--text); background: var(--bg-softer); }

.z-theme-btn {
    width: 32px;
    height: 32px;
    border-radius: 7px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s, border-color 0.15s;
    flex-shrink: 0;
}

.z-theme-btn:hover { color: var(--text); border-color: var(--border-strong); }
.z-theme-btn svg { width: 15px; height: 15px; }
.z-theme-btn .icon-sun { display: none; }
[data-theme="light"] .z-theme-btn .icon-sun { display: block; }
[data-theme="light"] .z-theme-btn .icon-moon { display: none; }

/* ============ 布局容器 ============ */
.z-container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

.z-page-head { margin-bottom: 1.8rem; }

.z-page-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

.z-page-title .grad { color: var(--accent); }

.z-page-sub { color: var(--text-2); margin-top: 0.4rem; font-size: 0.95rem; max-width: 760px; }

/* ============ 卡片 / 面板 ============ */
.z-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem;
    transition: background 0.15s, border-color 0.15s;
}

.z-card + .z-card { margin-top: 1.2rem; }

.z-card-title {
    font-size: 1rem;
    font-weight: 650;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.z-card-title svg { width: 16px; height: 16px; color: var(--accent); flex-shrink: 0; }

/* ============ 表单控件 ============ */
.z-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-2);
    margin-bottom: 0.4rem;
}

input, select, textarea {
    font-family: var(--font);
    font-size: 0.95rem;
    color: var(--text);
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.55rem 0.75rem;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent);
}

input::placeholder, textarea::placeholder { color: var(--text-3); }

textarea { resize: vertical; min-height: 120px; }

select { cursor: pointer; }

input[type="checkbox"], input[type="radio"] { accent-color: var(--accent); width: auto; padding: 0; }

input[type="color"] { padding: 0.2rem; height: 2.4rem; cursor: pointer; }

input[type="date"] { color-scheme: dark; }
[data-theme="light"] input[type="date"] { color-scheme: light; }

/* ============ 按钮 ============ */
.z-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.58rem 1.15rem;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 550;
    text-decoration: none;
    line-height: 1.4;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    white-space: nowrap;
}

.z-btn:active { transform: none; }
.z-btn svg { width: 15px; height: 15px; }

.z-btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

[data-theme="dark"] .z-btn-primary { color: #0c0c0e; }

.z-btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

.z-btn-ghost {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text-2);
}

.z-btn-ghost:hover { color: var(--text); border-color: var(--text-3); }

.z-btn-danger {
    background: transparent;
    border-color: color-mix(in srgb, var(--danger) 45%, transparent);
    color: var(--danger);
}

.z-btn-danger:hover { background: color-mix(in srgb, var(--danger) 10%, transparent); }

button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============ 表格 ============ */
.z-table-wrap { overflow-x: auto; border-radius: 10px; border: 1px solid var(--border); }

table.z-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.z-table th, .z-table td {
    padding: 0.6rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.z-table th {
    color: var(--text-2);
    font-weight: 600;
    font-size: 0.8rem;
    background: var(--bg-softer);
    position: sticky;
    top: 0;
}

.z-table tbody tr:last-child td { border-bottom: none; }
.z-table tbody tr { transition: background 0.1s; }
.z-table tbody tr:hover { background: var(--card-hover); }

/* ============ 徽章 / 标签 ============ */
.z-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.14rem 0.55rem;
    border-radius: 5px;
    border: 1px solid transparent;
    white-space: nowrap;
}

.z-badge-info  { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.z-badge-ok    { color: var(--ok); background: color-mix(in srgb, var(--ok) 10%, transparent); border-color: color-mix(in srgb, var(--ok) 30%, transparent); }
.z-badge-warn  { color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, transparent); border-color: color-mix(in srgb, var(--warn) 35%, transparent); }
.z-badge-danger{ color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); border-color: color-mix(in srgb, var(--danger) 35%, transparent); }

.z-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-family: var(--mono);
    color: var(--text-3);
    border: 1px solid var(--border);
    padding: 0.08rem 0.5rem;
    border-radius: 5px;
    white-space: nowrap;
}

.z-kbd {
    font-size: 0.72rem;
    font-family: var(--mono);
    color: var(--text-3);
    border: 1px solid var(--border);
    border-bottom-width: 2px;
    background: var(--bg-softer);
    border-radius: 5px;
    padding: 0.08rem 0.45rem;
}

/* ============ 代码 / 结果区 ============ */
.z-code, pre.z-code {
    font-family: var(--mono);
    font-size: 0.85rem;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    overflow: auto;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
}

.z-result {
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-softer);
    padding: 1rem 1.2rem;
    font-size: 0.95rem;
}

.z-result-big {
    font-size: 1.6rem;
    font-weight: 750;
    letter-spacing: -0.02em;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

/* ============ 空状态 ============ */
.z-empty {
    text-align: center;
    padding: 3rem 1rem;
    border-radius: var(--radius);
    border: 1px dashed var(--border-strong);
    color: var(--text-3);
}

.z-empty svg { width: 32px; height: 32px; margin-bottom: 0.8rem; opacity: 0.5; }
.z-empty-title { font-size: 1rem; font-weight: 600; color: var(--text-2); margin-bottom: 0.3rem; }

/* ============ 选项卡 ============ */
.z-tabs {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 1.1rem;
}

.z-tab {
    padding: 0.38rem 0.9rem;
    border-radius: 7px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-2);
    font-size: 0.875rem;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.15s;
}

.z-tab:hover { color: var(--text); border-color: var(--border-strong); }

.z-tab.active, .z-tab.z-active {
    background: var(--bg-softer);
    border-color: var(--border-strong);
    color: var(--text);
    font-weight: 600;
}

/* ============ 工具类 ============ */
.z-row { display: flex; align-items: center; gap: 0.7rem; flex-wrap: wrap; }
.z-row-between { display: flex; align-items: center; justify-content: space-between; gap: 0.7rem; flex-wrap: wrap; }
.z-grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.z-muted { color: var(--text-2); }
.z-small { font-size: 0.8rem; color: var(--text-3); }
.z-mono { font-family: var(--mono); }
.z-mt { margin-top: 1rem; }
.z-mb { margin-bottom: 1rem; }
.z-center { text-align: center; }
.z-hidden { display: none !important; }
.z-sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    border: 0;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

hr.z-hr { border: none; border-top: 1px solid var(--border); margin: 1.2rem 0; }

/* ============ 页脚 ============ */
.z-footer {
    border-top: 1px solid var(--border);
    padding: 1.6rem 1.5rem;
    text-align: center;
    color: var(--text-3);
    font-size: 0.85rem;
}

.z-footer a { color: var(--text-2); text-decoration: none; }
.z-footer a:hover { color: var(--text); text-decoration: underline; }
.z-footer .sep { margin: 0 0.5rem; opacity: 0.5; }

/* ============ 响应式 ============ */
@media (max-width: 640px) {
    .z-nav-inner { padding: 0.6rem 1.1rem; }
    .z-brand-text span { display: none; }
    .z-container { padding: 1.3rem 1.1rem 3rem; }
    .z-card { padding: 1.1rem; }
}