/* ============ CSS 變量與主題 ============ */
:root {
    /* 日間主題 */
    --bg: #f8f6f4;
    --bg-card: #ffffff;
    --bg-card-hover: #faf8f6;
    --bg-soft: #f0ebe6;
    --text: #2a2522;
    --text-secondary: #5c534d;
    --text-muted: #8a8078;
    --accent: #c2789a;
    --accent-hover: #a85e7e;
    --accent-soft: #f0dbe5;
    --accent-glow: rgba(194, 120, 154, 0.15);
    --border: #e0d8d2;
    --shadow: rgba(42, 37, 34, 0.08);
    --shadow-lg: rgba(42, 37, 34, 0.12);
    --nav-bg: rgba(248, 246, 244, 0.85);
    --footer-bg: #f0ebe6;
    --input-bg: #faf8f6;
    --input-border: #d8d0ca;
    --scrollbar-track: #f0ebe6;
    --scrollbar-thumb: #c2789a;
    --toggle-bg: #f0ebe6;
    --toggle-text: #5c534d;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

html.dark-theme {
    --bg: #1c1917;
    --bg-card: #262220;
    --bg-card-hover: #2e2a28;
    --bg-soft: #33302d;
    --text: #e8e4e0;
    --text-secondary: #b0a8a0;
    --text-muted: #7a7268;
    --accent: #d690ac;
    --accent-hover: #e5a5c0;
    --accent-soft: #3a2f35;
    --accent-glow: rgba(214, 144, 172, 0.2);
    --border: #3a3532;
    --shadow: rgba(0, 0, 0, 0.4);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    --nav-bg: rgba(28, 25, 23, 0.9);
    --footer-bg: #1c1917;
    --input-bg: #262220;
    --input-border: #3a3532;
    --scrollbar-track: #1c1917;
    --scrollbar-thumb: #d690ac;
    --toggle-bg: #33302d;
    --toggle-text: #b0a8a0;
}

/* ============ 基礎重置 ============ */
*,
*::before,
*::after { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
    font-family: 'Segoe UI', 'PingFang TC', 'Microsoft JhengHei', 'Noto Sans TC', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }

a { color: var(--accent); text-decoration: none; transition: color 0.25s; }
a:hover { color: var(--accent-hover); }

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    transition: all 0.25s;
}
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ============ 導航 ============ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    transition: all var(--transition);
}
.navbar.scrolled {
    box-shadow: 0 4px 24px var(--shadow);
    border-bottom-color: var(--accent);
}

.navbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    gap: 1rem;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
}
.navbar-brand .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse {
    0%,100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.4); opacity: 0.6; }
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 0.15rem;
    list-style: none;
}
.navbar-links a {
    display: block;
    padding: 0.45rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.25s;
    white-space: nowrap;
}
.navbar-links a:hover { color: var(--accent); background: var(--bg-soft); }
.navbar-links a.active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

.navbar-actions { display: flex; align-items: center; gap: 0.4rem; flex-shrink: 0; }

.icon-btn {
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--toggle-bg);
    color: var(--toggle-text);
    font-size: 1rem;
    border: 1px solid var(--border);
}
.icon-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: scale(1.05); }

.lang-btn {
    width: auto;
    padding: 0 0.9rem;
    height: 36px;
    border-radius: 18px;
    font-weight: 600;
    font-size: 0.78rem;
    letter-spacing: 0.5px;
    background: var(--toggle-bg);
    color: var(--toggle-text);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}
.lang-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 7px;
    border-radius: 8px;
    background: var(--toggle-bg);
    border: 1px solid var(--border);
}
.hamburger span {
    width: 18px; height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(4px,4px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(4px,-4px); }

/* ============ 主內容 ============ */
.main-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 75px 1.5rem 2rem;
    min-height: calc(100vh - 100px);
    min-height: calc(100dvh - 100px);
}

.page { display: none; animation: fadeUp 0.45s ease forwards; }
.page.active { display: block; }
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ 首頁 Hero ============ */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 3.5rem 1.5rem;
    border-radius: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: 0 4px 24px var(--shadow);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}
.hero::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at 30% 40%, var(--accent-glow) 0%, transparent 55%),
                radial-gradient(ellipse at 70% 60%, var(--accent-glow) 0%, transparent 55%);
    pointer-events: none;
    z-index: 0;
}
.hero > * { position: relative; z-index: 1; }

.hero-badge {
    display: inline-block;
    padding: 0.35rem 1.1rem;
    border-radius: 20px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 1.2rem;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 0.8rem;
    color: var(--text);
}
.hero-title .highlight { color: var(--accent); }

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.8rem;
    font-weight: 400;
    max-width: 560px;
    min-height: 2.2em;
}
.hero-subtitle .cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--accent);
    margin-left: 3px;
    animation: blink 0.7s infinite;
    vertical-align: text-bottom;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1.8rem;
}
.hero-tag {
    padding: 0.4rem 1.1rem;
    border-radius: 20px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.25s;
}
.hero-tag:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 6px 16px var(--accent-glow); }

.hero-btns { display: flex; gap: 0.8rem; flex-wrap: wrap; justify-content: center; }
.btn {
    padding: 0.7rem 1.8rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.88rem;
    letter-spacing: 0.4px;
    transition: all 0.3s;
    border: 2px solid transparent;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 20px var(--accent-glow); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 10px 28px var(--accent-glow); color: #fff; }
.btn-secondary { background: var(--bg-soft); color: var(--text-secondary); border-color: var(--border); }
.btn-secondary:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px var(--accent-glow); }

/* ============ 精選卡片 ============ */
.featured-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.featured-card {
    background: var(--bg-card);
    border-radius: 14px;
    padding: 1.2rem 1.3rem;
    border: 1px solid var(--border);
    box-shadow: 0 3px 16px var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s;
    cursor: pointer;
}
.featured-card:hover { transform: translateY(-4px); box-shadow: 0 8px 28px var(--shadow-lg); border-color: var(--accent); }
.featured-card .fc-icon {
    width: 40px; height: 40px;
    border-radius: 10px;
    background: var(--accent-soft);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    font-weight: 700;
}
.featured-card .fc-info h4 { font-size: 0.9rem; font-weight: 600; color: var(--text); }
.featured-card .fc-info p { font-size: 0.75rem; color: var(--text-muted); }

/* ============ 頁面標題 ============ */
.section-header { text-align: center; margin-bottom: 2rem; }
.section-header h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); font-weight: 800; color: var(--text); margin-bottom: 0.4rem; }
.section-header h2 span { color: var(--accent); }
.section-header p { color: var(--text-secondary); font-size: 0.9rem; max-width: 520px; margin: 0 auto; }

/* ============ 音樂搜索 ============ */
.music-search-wrap { max-width: 480px; margin: 0 auto 1.5rem; }
.music-search {
    width: 100%;
    padding: 0.7rem 1.2rem;
    border-radius: 25px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all 0.25s;
    outline: none;
}
.music-search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.music-search::placeholder { color: var(--text-muted); }
.no-results { text-align: center; padding: 3rem 1rem; color: var(--text-muted); font-size: 0.95rem; }

/* ============ 404 頁面 ============ */
.error-page { text-align: center; padding: 4rem 1rem; max-width: 500px; margin: 0 auto; }
.error-code {
    font-size: clamp(5rem, 15vw, 8rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 1rem;
}
.error-page h1 { font-size: 1.5rem; color: var(--text); margin-bottom: 0.6rem; }
.error-page p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 2rem; line-height: 1.6; }
.error-actions { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }

/* ============ 音樂卡片 ============ */
.music-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.2rem;
    margin-top: 1rem;
}
.music-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    box-shadow: 0 3px 16px var(--shadow);
    transition: all 0.35s cubic-bezier(0.2, 0.8, 0.3, 1.1);
    cursor: default;
    position: relative;
    overflow: hidden;
}
.music-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--accent);
    border-radius: 16px 16px 0 0;
    opacity: 0;
    transition: opacity 0.3s;
}
.music-card:hover { transform: translateY(-6px); box-shadow: 0 12px 36px var(--shadow-lg); background: var(--bg-card-hover); border-color: var(--accent); }
.music-card:hover::before { opacity: 1; }

.music-card .card-header { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 0.8rem; }
.music-card .card-avatar {
    width: 44px; height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    color: #fff;
    flex-shrink: 0;
    letter-spacing: 0.5px;
}
.avatar-beyond { background: linear-gradient(135deg, #c2789a, #8b5cf6); }
.avatar-queen { background: linear-gradient(135deg, #c2789a, #f59e0b); }
.avatar-walters { background: linear-gradient(135deg, #c2789a, #3b82f6); }
.avatar-toby { background: linear-gradient(135deg, #c2789a, #ec4899); }
.avatar-caodong { background: linear-gradient(135deg, #c2789a, #dc2626); }
.avatar-template { background: linear-gradient(135deg, #c2789a, #6b7280); }

.music-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--text); }
.music-card .genre {
    font-size: 0.72rem;
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 0.7rem;
}
.music-card .desc { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.65; }
.music-card .song-list { list-style: none; padding: 0; border-top: 1px solid var(--border); padding-top: 0.7rem; }
.music-card .song-list li {
    font-size: 0.78rem;
    color: var(--text-muted);
    padding: 0.22rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.2s, transform 0.2s;
    border-radius: 4px;
}
.music-card .song-list li:hover {
    color: var(--accent);
    transform: translateX(4px);
}
.music-card .song-list li::before { content: '♪'; color: var(--accent); font-size: 0.8rem; }
.song-placeholder { color: var(--text-muted); font-style: italic; font-size: 0.75rem; }

/* ============ 關於頁面 ============ */
.about-container { display: grid; grid-template-columns: 1fr 2fr; gap: 1.5rem; align-items: start; }

/* ============ 數據統計區 ============ */
.stats-row {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    max-width: 600px;
    margin: 0 auto 2.5rem;
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 3px 16px var(--shadow);
}
.stat-item { text-align: center; flex: 1; }
.stat-num {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}
.stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.3rem; }
.about-profile {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 1.8rem;
    text-align: center;
    border: 1px solid var(--border);
    box-shadow: 0 3px 16px var(--shadow);
}
.about-profile .avatar-large {
    width: 90px; height: 90px;
    border-radius: 50%;
    background: var(--accent-soft);
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    color: var(--accent);
    border: 3px solid var(--bg-card);
    box-shadow: 0 4px 20px var(--accent-glow);
}
.about-profile h3 { font-size: 1.1rem; font-weight: 700; }
.about-profile p { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.2rem; }
.about-profile .profile-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; justify-content: center; margin-top: 1rem; }
.profile-tags span {
    padding: 0.3rem 0.8rem;
    border-radius: 14px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.about-sections { display: flex; flex-direction: column; gap: 1rem; }
.about-block {
    background: var(--bg-card);
    border-radius: 14px;
    padding: 1.4rem 1.6rem;
    border: 1px solid var(--border);
    box-shadow: 0 3px 16px var(--shadow);
    transition: all 0.3s;
}
.about-block:hover { box-shadow: 0 8px 24px var(--shadow-lg); border-color: var(--accent); }
.about-block h3 { font-size: 0.95rem; font-weight: 700; color: var(--accent); margin-bottom: 0.6rem; display: flex; align-items: center; gap: 0.4rem; }
.about-block p, .about-block li { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.7; }
.about-block ul { list-style: none; padding: 0; }
.about-block ul li { padding: 0.2rem 0; display: flex; align-items: center; gap: 0.5rem; }
.about-block ul li::before { content: '•'; color: var(--accent); font-weight: 700; }

/* ============ 聯繫頁面 ============ */
.contact-container { max-width: 560px; margin: 0 auto; }
.contact-info { display: flex; flex-direction: column; gap: 0.9rem; }
.contact-item {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1rem 1.2rem;
    border: 1px solid var(--border);
    box-shadow: 0 3px 12px var(--shadow);
    display: flex;
    align-items: center;
    gap: 0.9rem;
    transition: all 0.25s;
}
.contact-item:hover { transform: translateX(4px); border-color: var(--accent); box-shadow: 0 6px 18px var(--shadow-lg); }
.contact-item .ci-icon {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    flex-shrink: 0;
}
.contact-item .ci-text strong { display: block; font-size: 0.82rem; color: var(--text); font-weight: 600; }
.contact-item .ci-text span { font-size: 0.78rem; color: var(--text-muted); }

.contact-form {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 1.8rem;
    border: 1px solid var(--border);
    box-shadow: 0 3px 16px var(--shadow);
}
.contact-form h3 { font-size: 1rem; font-weight: 700; color: var(--accent); margin-bottom: 1.2rem; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.78rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.3rem; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.65rem 0.9rem;
    border-radius: 10px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.85rem;
    transition: all 0.25s;
    resize: vertical;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.form-group textarea { min-height: 100px; }

.form-status {
    display: none;
    padding: 0.7rem 1rem;
    border-radius: 10px;
    font-size: 0.82rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}
.form-status.success {
    display: block;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid var(--accent);
}
.form-status.error {
    display: block;
    background: rgba(220, 38, 38, 0.08);
    color: #dc2626;
    border: 1px solid rgba(220, 38, 38, 0.3);
}
html.dark-theme .form-status.error {
    background: rgba(220, 38, 38, 0.15);
    color: #f87171;
    border-color: rgba(220, 38, 38, 0.4);
}
button[type="submit"]:disabled { opacity: 0.6; cursor: not-allowed; transform: none !important; }

/* ============ 社交媒體鏈接 ============ */
.social-links {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.35rem;
    flex-wrap: wrap;
}
.social-links a {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--accent-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: all 0.25s;
    flex-shrink: 0;
}
.social-links a:hover {
    background: var(--accent);
    transform: scale(1.12);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* ============ 分享欄 ============ */
.share-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
}
.share-bar > span {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}
button.distribute-btn {
    appearance: none;
    -webkit-appearance: none;
    min-width: 44px;
    padding: 0.35rem 0.9rem;
    border-radius: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: 0 1px 4px var(--shadow);
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s;
    font-family: inherit;
    line-height: 1.4;
    flex-shrink: 0;
    display: inline-block;
}
button.distribute-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: translateY(-1px);
}
.share-warning {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-style: italic;
    margin-left: 0.3rem;
}

/* ============ 分享提示 toast ============ */
.share-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text);
    color: var(--bg);
    padding: 0.6rem 1.3rem;
    border-radius: 20px;
    font-size: 0.82rem;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 9999;
    pointer-events: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.share-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============ 滾動進度條 ============ */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
    z-index: 9998;
    transition: width 0.1s linear;
    border-radius: 0 2px 2px 0;
}

/* ============ 回到頂部 ============ */
.back-to-top {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 9997;
    box-shadow: 0 4px 16px var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

/* ============ 頁尾 ============ */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--border);
    padding: 1.2rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.78rem;
    transition: all var(--transition);
    margin-top: 2rem;
}
.footer .accent { color: var(--accent); font-weight: 600; }

/* ============ 響應式 ============ */
@media (max-width: 850px) {
    .about-container, .contact-container { grid-template-columns: 1fr; }
    .navbar-inner { padding: 0 0.5rem; }
}

@media (max-width: 700px) {
    .navbar { padding: 0 0.8rem; }
    .navbar-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0; right: 0;
        flex-direction: column;
        background: var(--nav-bg);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        padding: 0.8rem;
        gap: 0.3rem;
        box-shadow: 0 10px 30px var(--shadow);
    }
    .navbar-links.open { display: flex; }
    .navbar-links a { text-align: center; padding: 0.6rem 1rem; width: 100%; }
    .hamburger { display: flex; }
    .main-content { padding: 65px 0.8rem 1.5rem; }
    .hero { padding: 2rem 1rem; }
    .music-grid { grid-template-columns: 1fr; }
    .featured-strip { grid-template-columns: 1fr; }
    .btn { padding: 0.6rem 1.4rem; font-size: 0.8rem; }
    .stats-row { gap: 1rem; padding: 1rem; }
    .stat-num { font-size: 1.5rem; }
    .back-to-top { bottom: 1rem; right: 1rem; width: 36px; height: 36px; }
}

@media (max-width: 400px) {
    .navbar-brand { font-size: 0.9rem; }
    .lang-btn { padding: 0 0.6rem; font-size: 0.7rem; height: 32px; }
    .icon-btn { width: 32px; height: 32px; font-size: 0.85rem; }
}

/* ============ 無障礙：降低動效 ============ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}