/* ===================================================
   AI Canvas — 初始畫布樣式
   =================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Space+Grotesk:wght@400;600;700&display=swap');

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #0f0f0f;
    --surface: #1a1a2e;
    --surface-light: #25253e;
    --primary: #e94560;
    --primary-glow: rgba(233, 69, 96, 0.3);
    --accent: #0f3460;
    --text: #eaeaea;
    --text-muted: #888;
    --radius: 12px;
    --font-body: 'Inter', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
}

/* ---------- Header ---------- */
.site-header {
    text-align: center;
    padding: 2.5rem 1rem 1.5rem;
    background: linear-gradient(135deg, var(--surface) 0%, var(--accent) 100%);
    border-bottom: 2px solid var(--primary);
    position: relative;
    overflow: hidden;
}

.site-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    animation: glow-line 3s ease-in-out infinite;
}

@keyframes glow-line {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.site-header h1 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #ff6b8a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

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

/* ---------- Canvas Area ---------- */
#canvas-area {
    flex: 1;
    padding: 2rem;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
}

.canvas-section {
    margin-bottom: 2rem;
}

.canvas-section h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.canvas-section p {
    color: var(--text-muted);
    line-height: 1.7;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--surface-light);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    color: var(--text);
}

.card p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.demo-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.4rem;
    border: none;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: #d63851;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-secondary {
    background: var(--surface-light);
    color: var(--text);
    border: 1px solid var(--text-muted);
}

.btn-secondary:hover {
    background: var(--surface);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-accent {
    background: var(--accent);
    color: var(--text);
}

.btn-accent:hover {
    background: #1a4a7a;
}

/* ---------- Mutation Log ---------- */
/* !important 保護日誌區不被 AI 生成的 CSS 覆蓋 */
.mutation-log {
    margin-top: 1.5rem !important;
    padding: 1rem !important;
    background: var(--surface) !important;
    border-radius: var(--radius) !important;
    border: 1px solid var(--surface-light) !important;
    max-height: 200px !important;
    overflow-y: auto !important;
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
    transform: none !important;
    animation: none !important;
    filter: none !important;
}

.mutation-log h3 {
    font-family: var(--font-display) !important;
    font-size: 1rem !important;
    margin-bottom: 0.75rem !important;
    color: var(--primary) !important;
}

.mutation-log .log-entry {
    font-size: 0.8rem !important;
    padding: 0.4rem 0 !important;
    border-bottom: 1px solid var(--surface-light) !important;
    color: var(--text-muted) !important;
}

.mutation-log .log-entry:last-child {
    border-bottom: none !important;
}

.mutation-log .log-entry .log-type {
    display: inline-block !important;
    padding: 0.1rem 0.4rem !important;
    border-radius: 4px !important;
    font-size: 0.7rem !important;
    font-weight: 600 !important;
    text-transform: uppercase !important;
    margin-right: 0.4rem !important;
}

.mutation-log .log-entry .log-type.css {
    background: #1e3a5f !important;
    color: #64b5f6 !important;
}

.empty-log {
    color: var(--text-muted) !important;
    font-size: 0.85rem !important;
    font-style: italic !important;
}

/* ---------- Control Panel Host (Fixed Bottom) ---------- */
/* 內部樣式已移入 Shadow DOM，外部 CSS（含 AI 生成）無法穿透 */
/* 這裡只保護 host 元素本身的定位，防止被廣義選擇器影響 */
#control-panel-host {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 9999 !important;
    transform: none !important;
    animation: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    filter: none !important;
    display: block !important;
}

/* ---------- Footer Spacer (for fixed control panel) ---------- */
.footer-spacer {
    height: 80px;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .site-header h1 {
        font-size: 1.8rem;
    }

    #canvas-area {
        padding: 1rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}