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

:root {
    --nav-bg: #1d1d1f;
    --nav-text: #f5f5f7;
    --card-bg: #f5f5f7;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --divider: #d2d2d7;
    --link: #0066cc;
    --panel-bg: #ffffff;
    --panel-shadow: 0 8px 40px rgba(0,0,0,0.12);
    --panel-border: #e8e8ed;
}

[data-theme="dark"] {
    --nav-bg: #1d1d1f;
    --nav-text: #f5f5f7;
    --card-bg: #1c1c1e;
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #86868b;
    --divider: #38383a;
    --link: #2997ff;
    --panel-bg: #1c1c1e;
    --panel-shadow: 0 8px 40px rgba(0,0,0,0.6);
    --panel-border: #38383a;
}

html, body {
    background: transparent;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
    min-height: 48px;
    pointer-events: none; /* 穿透背景 */
}

/* 导航栏及菜单可点击 */
.global-nav, .nav-right-group, .settings-panel {
    pointer-events: auto;
}

.global-nav {
    background-color: var(--nav-bg);
    color: var(--nav-text);
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 22px;
    font-size: 12px;
    position: relative;
}

.global-nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.global-nav li {
    opacity: 0.8;
    transition: opacity 0.2s ease;
    white-space: nowrap;
}

.global-nav li:hover { opacity: 1; }
.global-nav a { color: inherit; text-decoration: none; display: inline-block; cursor: pointer; }
.global-nav .logo-placeholder { font-weight: 600; font-size: 16px; opacity: 1; margin-right: 12px; }
.global-nav .nav-active { opacity: 1; font-weight: 700; }

/* ===== 右侧按钮组 ===== */
.nav-right-group {
    position: absolute;
    right: 24px;
    top: 7px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1001;
    overflow: visible;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 32px;
    padding: 0 16px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 16px;
    text-decoration: none !important;
    transition: all 0.2s ease;
    cursor: pointer;
    white-space: nowrap;
}

.btn-login { background-color: var(--link); color: #ffffff !important; border: 1px solid transparent; }
.btn-login:hover { opacity: 0.85; }
.btn-user { background-color: transparent !important; color: var(--nav-text) !important; border: 1px solid transparent; font-weight: 600; }
.btn-user:hover { opacity: 0.8; }
.btn-register { background-color: transparent; color: var(--nav-text) !important; border: 1px solid rgba(255, 255, 255, 0.4); }
.btn-register:hover { background-color: rgba(255, 255, 255, 0.1); border-color: #ffffff; }

/* ===== 用户悬浮菜单 ===== */
.user-menu-container {
    position: relative;
    display: inline-block;
    pointer-events: auto;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 8px;
    background-color: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    box-shadow: var(--panel-shadow);
    padding: 6px 0;
    width: 130px;
    display: none; 
    flex-direction: column;
    z-index: 1002;
    opacity: 0;
    translate: 0 -6px;
    transition: opacity 0.2s ease, translate 0.2s ease;
}

.user-dropdown.show {
    display: flex;
    opacity: 1;
    translate: 0 0;
}

.user-dropdown a {
    display: block;
    padding: 10px 18px;
    color: var(--text) !important;
    font-size: 13px;
    text-decoration: none !important;
    text-align: center;
    transition: background-color 0.2s ease;
}

.user-dropdown a:hover { background-color: var(--card-bg); }
.dropdown-divider { height: 1px; background-color: var(--divider); margin: 4px 0; }

/* ===== 设置按钮 ===== */
.settings-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--panel-border);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 16px;
    transition: transform 0.2s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    flex-shrink: 0;
}
.settings-btn:hover { transform: scale(1.08); }

/* ===== 设置面板 ===== */
.settings-panel {
    position: fixed;
    top: 48px;
    right: 24px;
    z-index: 1000;
    width: 280px;
    background-color: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    box-shadow: var(--panel-shadow);
    padding: 20px;
    display: none;
    flex-direction: column;
    gap: 16px;
    margin-top: 4px;
    pointer-events: auto;
}

.settings-panel.open { display: flex; animation: panelIn 0.22s ease; }

@keyframes panelIn {
    from { opacity: 0; transform: translateY(-8px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.settings-panel h3 { font-size: 13px; font-weight: 600; text-transform: uppercase; color: var(--text-secondary); margin-bottom: 2px; }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 14px; color: var(--text); }
.setting-row label { cursor: pointer; flex: 1; }

.theme-group { display: flex; gap: 6px; background-color: var(--card-bg); border-radius: 10px; padding: 3px; }
.theme-group button {
    flex: 1; border: none; background: transparent; color: var(--text-secondary);
    font-size: 12px; font-weight: 500; padding: 6px 4px; border-radius: 8px;
    cursor: pointer; transition: 0.2s; font-family: inherit;
}
.theme-group button.active { background-color: var(--panel-bg); color: var(--text); box-shadow: 0 1px 4px rgba(0,0,0,0.1); }
[data-theme="dark"] .theme-group button.active { background-color: #3a3a3c; color: #fff; }

.toggle { position: relative; width: 42px; height: 24px; background-color: var(--divider); border-radius: 12px; cursor: pointer; transition: 0.25s; flex-shrink: 0; }
.toggle::after { content: ''; position: absolute; top: 2px; left: 2px; width: 20px; height: 20px; border-radius: 50%; background-color: #fff; transition: 0.25s; box-shadow: 0 1px 3px rgba(0,0,0,0.2); }
.toggle.on { background-color: #30d158; }
.toggle.on::after { transform: translateX(18px); }

.music-select {
    width: 100%; padding: 8px 10px; border-radius: 10px; border: 1px solid var(--panel-border);
    background-color: var(--card-bg); color: var(--text); font-size: 13px; font-family: inherit;
    cursor: pointer; outline: none; transition: 0.2s; -webkit-appearance: none; appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2386868b' d='M6 8.5L1.5 4h9z'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 10px center; padding-right: 28px;
}
.music-select:focus { border-color: var(--link); }
.setting-divider { height: 1px; background-color: var(--panel-border); margin: 2px 0; }

@media (max-width: 1024px) {
    .nav-right-group { gap: 8px; }
    .nav-btn { padding: 0 10px; font-size: 12px; }
}

@media (max-width: 768px) {
    .btn-register { display: none; }
    .nav-right-group { right: 16px; }
    .settings-panel { right: 16px; top: 44px; }
    .global-nav ul { gap: 16px; }
}

@media (max-width: 480px) {
    .settings-panel { width: calc(100vw - 32px); right: 16px; }
}