/* ===== 變數與色彩系統 (焦糖奶茶 Warm Milk Tea & Clay) ===== */

:root {
    /* 背景色：單一平色，移除漸層 */
    --bg-base: #F2EBE5;

    /* 文字色：#3E2C22 (深咖啡色) */
    --text-primary: #3E2C22;
    --text-secondary: #7A5C4A;

    /* 輔助色 (30%)：#D9CBB8 (可可燕麥) 應用於玻璃卡片 */
    --glass-bg: rgba(217, 203, 184, 0.45);
    --glass-border: rgba(62, 44, 34, 0.15);
    --glass-shadow: 0 8px 32px rgba(62, 44, 34, 0.08);

    /* 表格格線：明顯可見的邊框色 */
    --table-border: rgba(62, 44, 34, 0.3);
    --table-header-bg: rgba(62, 44, 34, 0.08);
    --table-stripe-bg: rgba(62, 44, 34, 0.03);

    /* 程式碼區塊背景 */
    --code-bg: rgba(62, 44, 34, 0.06);
}

/* ===== 基礎重置與全域設定 (Mobile First) ===== */

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

body {
    font-family: 'Noto Serif TC', 'Georgia', serif;
    font-size: 15px;
    line-height: 1.75;
    color: var(--text-primary);
    background: var(--bg-base);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== 景深光暈 (背景裝飾) — 停用 ===== */

.bg-orb,
.orb-1,
.orb-2,
.orb-3 {
    display: none;
}

/* ===== 玻璃擬物化 (Glassmorphism) 核心樣式 ===== */

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
}

/* ===== 導覽列 ===== */

.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    margin: 12px;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-controls {
    display: flex;
    gap: 8px;
    width: 100%;
}

/* ===== 按鈕設計 ===== */

button {
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 8px 16px;
    transition: all 0.3s ease;
    flex: 1;
    min-height: 44px;
}

button:hover {
    background: rgba(62, 44, 34, 0.1);
    transform: translateY(-2px);
    color: var(--text-primary);
}

button.active {
    background: var(--text-secondary);
    color: #FAF5F0;
    border-color: var(--text-secondary);
    box-shadow: 0 4px 12px rgba(62, 44, 34, 0.2);
}

/* ===== 容器與佈局 ===== */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 12px;
}

/* 單一檔案選擇器 */

.file-selector {
    padding: 16px;
    margin-bottom: 24px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.file-selector .file-btn {
    flex: none;
}

/* 卡片設計 */

.md-card {
    padding: 20px 16px;
    margin-bottom: 24px;
}

.card-header {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--text-secondary);
    opacity: 0.8;
}

.file-title {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 700;
}

/* ===== Markdown 內容渲染樣式 ===== */

.md-content {
    word-wrap: break-word;
}

.md-content h1,
.md-content h2,
.md-content h3,
.md-content h4 {
    color: var(--text-primary);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-weight: 700;
}

.md-content h1 {
    font-size: 1.8rem;
    border-bottom: 2px solid rgba(62, 44, 34, 0.2);
    padding-bottom: 0.3em;
}

.md-content h2 {
    font-size: 1.5rem;
}

.md-content h3 {
    font-size: 1.25rem;
}

.md-content p {
    margin-bottom: 1em;
}

.md-content a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px dotted var(--text-secondary);
    transition: all 0.3s ease;
}

.md-content a:hover {
    color: var(--text-secondary);
    border-bottom-style: solid;
}

.md-content strong {
    color: var(--text-primary);
    font-weight: 700;
}

.md-content em {
    color: var(--text-secondary);
    font-style: italic;
}

.md-content ul,
.md-content ol {
    margin-left: 24px;
    margin-bottom: 1em;
}

.md-content li {
    margin-bottom: 0.3em;
}

.md-content blockquote {
    border-left: 4px solid var(--text-secondary);
    color: var(--text-secondary);
    margin: 0 0 1em 0;
    background: rgba(255, 255, 255, 0.3);
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
}

/* 程式碼與表格防破版 (橫向捲動) */

.md-content code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.md-content pre {
    background: var(--code-bg);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1em;
    border: 1px solid rgba(62, 44, 34, 0.15);
}

.md-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

/* ===== Markdown 表格 — 明顯格線 ===== */

.md-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1em;
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    border: 2px solid var(--table-border);
    border-radius: 6px;
}

.md-content th,
.md-content td {
    padding: 10px 14px;
    border: 1px solid var(--table-border);
    text-align: left;
}

.md-content th {
    background: var(--table-header-bg);
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid var(--table-border);
}

.md-content tr:nth-child(even) td {
    background: var(--table-stripe-bg);
}

/* ===== 動畫狀態 ===== */

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 載入中 Spinner */

.spinner-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(62, 44, 34, 0.15);
    border-top: 4px solid var(--text-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* 錯誤訊息 */

.error-msg {
    color: var(--text-primary);
    text-align: center;
    padding: 20px;
    font-weight: 600;
    background: rgba(62, 44, 34, 0.06);
    border-radius: 8px;
}

/* ===== 響應式設計 (RWD) ===== */

@media (min-width: 480px) {
    .navbar {
        flex-direction: row;
        justify-content: space-between;
        border-radius: 100px;
        padding: 12px 24px;
    }

    .nav-controls {
        width: auto;
    }

    .file-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .md-card {
        padding: 24px;
    }
}

@media (min-width: 768px) {
    body {
        font-size: 16px;
    }

    .container {
        padding: 24px;
    }

    .file-selector {
        grid-template-columns: repeat(5, 1fr);
    }

    .md-content table {
        display: table;
        white-space: normal;
    }
}