/**
 * ToolBox Common Stylesheet (common.css)
 * 全站統一設計規範與基礎組件庫
 */

/* ==========================================================================
   1. Design Tokens (色彩、間距、陰影與圓角)
   ========================================================================== */
:root {
    /* 品牌與重點色 */
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: rgba(37, 99, 235, 0.1);

    /* 淺色模式背景與文字 */
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --card-hover-bg: #fcfdfe;
    --card-secondary-bg: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;

    /* 狀態語意色 */
    --success: #10b981;
    --success-bg: #dcfce7;
    --success-text: #15803d;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --warning-text: #b45309;
    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --danger-text: #b91c1c;

    /* 標籤與徽章 */
    --tag-bg: #f1f5f9;
    --tag-text: #475569;
    --badge-bg: #dbeafe;
    --badge-text: #1d4ed8;

    /* 陰影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.08);

    /* 統計盒 (Summary Box) */
    --summary-bg: #0f172a;
    --summary-text: #ffffff;
    --summary-muted: #94a3b8;
    --summary-highlight: #38bdf8;

    /* 圓角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
}

[data-theme="dark"] {
    /* 深色模式重點色 */
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-soft: rgba(59, 130, 246, 0.18);

    /* 深色模式背景與文字 */
    --bg: #0f172a;
    --card-bg: #1e293b;
    --card-hover-bg: #24344d;
    --card-secondary-bg: #0f172a;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --border-hover: #475569;

    /* 狀態語意色 (深色調) */
    --success-bg: rgba(16, 185, 129, 0.2);
    --success-text: #34d399;
    --warning-bg: rgba(245, 158, 11, 0.2);
    --warning-text: #fbbf24;
    --danger-bg: rgba(239, 68, 68, 0.2);
    --danger-text: #f87171;

    /* 標籤與徽章 (深色調) */
    --tag-bg: #334155;
    --tag-text: #cbd5e1;
    --badge-bg: #1e3a8a;
    --badge-text: #93c5fd;

    /* 陰影 (深色加深) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.45);

    /* 統計盒 (深色模式) */
    --summary-bg: #0b1120;
    --summary-text: #f8fafc;
    --summary-muted: #94a3b8;
    --summary-highlight: #38bdf8;
}

/* ==========================================================================
   2. Base Reset & Typography
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.25s ease, color 0.25s ease;
    -webkit-font-smoothing: antialiased;
}

/* 佈局容器 */
.tb-container {
    width: 100%;
    max-width: 860px;
    margin: 0 auto;
    padding: 0 20px;
}

.tb-container-wide {
    max-width: 1080px;
}

/* ==========================================================================
   3. Unified Navigation Bar (全站頂部導覽)
   ========================================================================== */
.tb-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0 20px 0;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.tb-nav-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tb-nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 800;
    font-size: 1.25rem;
}

.tb-brand-badge {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 3px 10px rgba(37, 99, 235, 0.3);
}

.tb-nav-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.tb-nav-back:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--card-hover-bg);
    box-shadow: var(--shadow-sm);
}

.tb-nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.icon-btn {
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-main);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
}

.icon-btn-github svg {
    fill: currentColor;
    stroke: none;
}

/* 頁面標題區 (Page Header) */
.tb-header {
    text-align: center;
    margin-bottom: 28px;
}

.tb-header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
    color: var(--text-main);
}

.tb-header p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* ==========================================================================
   4. Cards & Containers (卡片組件)
   ========================================================================== */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    margin-bottom: 20px;
    transition: border-color 0.2s, background-color 0.25s;
}

/* ==========================================================================
   5. Form Controls (表單與輸入元件)
   ========================================================================== */
.field {
    display: flex;
    flex-direction: column;
}

.field label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-main);
}

.field input,
.field select,
input[type="text"].tb-input,
input[type="number"].tb-input {
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--card-bg);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.field input:focus,
.field select:focus,
input.tb-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ==========================================================================
   6. Buttons (按鈕系統)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 9px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.18s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--card-secondary-bg);
    border-color: var(--border);
    color: var(--text-main);
}

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

.btn-sm {
    font-size: 0.78rem;
    padding: 5px 11px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--card-secondary-bg);
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-sm:hover {
    background: var(--tag-bg);
    border-color: var(--border-hover);
}

.btn-dashed {
    width: 100%;
    padding: 12px;
    border: 2px dashed var(--border);
    background: transparent;
    border-radius: var(--radius-md);
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-dashed:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
}

/* ==========================================================================
   7. Badges & Tags (標籤與徽章)
   ========================================================================== */
.badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 6px;
    background: var(--badge-bg);
    color: var(--badge-text);
}

.tag {
    font-size: 0.72rem;
    padding: 2px 7px;
    background: var(--tag-bg);
    color: var(--tag-text);
    border-radius: 4px;
    font-weight: 500;
}

/* ==========================================================================
   8. Summary Box (統計面板)
   ========================================================================== */
.summary-box {
    background: var(--summary-bg);
    color: var(--summary-text);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg);
    transition: background-color 0.25s ease;
}

.summary-header {
    font-size: 1rem;
    font-weight: 600;
    color: var(--summary-muted);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

@media (max-width: 640px) {
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.summary-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: 12px 14px;
}

.summary-label {
    font-size: 0.78rem;
    color: var(--summary-muted);
    margin-bottom: 4px;
}

.summary-value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--summary-highlight);
}

.summary-unit {
    font-size: 0.75rem;
    color: var(--summary-muted);
    margin-left: 3px;
}

/* ==========================================================================
   9. Unified Footer (全站頁尾)
   ========================================================================== */
.tb-footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding: 24px 0 36px 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.tb-footer a {
    color: var(--accent);
    text-decoration: none;
}

.tb-footer a:hover {
    text-decoration: underline;
}

.tb-footer-links {
    margin-top: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}