/* === BASE & DESIGN TOKENS === */

/* --- 1. 全域與變數設定 (Global & Variables) --- */
:root {
    /* 色彩 Palette (Light Mode) */
    --bg-color: #f9fafb;
    --surface-color: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --input-bg: #ffffff;
    --primary-color: #3b82f6;
    --primary-color-hover: #2563eb;
    --secondary-color: #6b7280;
    --secondary-color-hover: #4b5563;
    --danger-color: #ef4444;
    --danger-color-hover: #dc2626;
    --success-color: #22c55e;
    --success-color-hover: #16a34a;

    /* 陰影 & 圓角 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;

    /* 字體 */
    --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body.dark-mode {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --text-primary: #e9ecef;
    --text-secondary: #9ca3af;
    --border-color: #495057;
    --input-bg: #2a2a2a;
}

/* --- 2. 基本樣式與 Reset --- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

body.modal-open main,
body.lightbox-open {
    overflow: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

h1,
h2,
h3 {
    color: var(--text-primary);
    font-weight: 700;
    margin-top: 0;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

.hidden {
    display: none !important;
}

.empty-message {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    padding: 4rem 0;
}

@media (max-width: 768px) {
    .container {
        padding: 1.5rem 1rem;
    }
}