:root {
    --bg: #fdfdfb;
    --text: #1a1a1a;
    --sub-text: #666;
    --accent: #2c3e50;
    --p-color: #3498db;
    --r-color: #e67e22;
    --s-color: #27ae60;
    --brd: #e0e0d5;
    --card-bg: #fff;
    --tag-bg-w: #f0f0f0;
    --tag-bg-p: #e3f2fd;
    --tag-bg-r: #fff3e0;
    --tag-bg-s: #e8f5e9;
    --tab-bg: #eee;
    --chip-hover-bg: #f9f9f9;
    --section-label-color: #999;
    --footer-color: #aaa;
}

[data-theme="dark"] {
    --bg: #1a1a1a;
    --text: #e0e0e0;
    --sub-text: #aaa;
    --accent: #4a90e2;
    --p-color: #5dade2;
    --r-color: #f39c12;
    --s-color: #58d68d;
    --brd: #333;
    --card-bg: #2d2d2d;
    --tag-bg-w: #3d3d3d;
    --tag-bg-p: #1a3a5c;
    --tag-bg-r: #5c3a1a;
    --tag-bg-s: #1a5c3a;
    --tab-bg: #3d3d3d;
    --chip-hover-bg: #4d4d4d;
    --section-label-color: #888;
    --footer-color: #666;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
    font-family: "Charter", "Georgia", "Source Serif Pro", serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    position: sticky; top: 0;
    background: rgba(var(--bg), 0.98);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--brd);
    padding: 15px 20px;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.header-title {
    font-weight: bold;
    letter-spacing: 2px;
    flex: 1;
}

#themeToggle {
    display: flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    border: 1px solid var(--brd);
    border-radius: 16px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--sub-text);
    transition: all 0.2s ease;
}

#themeToggle:hover {
    border-color: var(--accent);
    color: var(--text);
}

.theme-switch-icon {
    font-size: 1rem;
}

.search-box {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--brd);
    border-radius: 6px;
    font-size: 16px;
    outline: none;
    font-family: inherit;
    background: var(--card-bg);
    color: var(--text);
}

.nav-tabs {
    display: flex; gap: 8px; margin-top: 10px;
}

.tab {
    flex: 1; padding: 8px; border: none; background: var(--tab-bg);
    border-radius: 4px; font-size: 0.8rem; cursor: pointer;
    color: var(--text);
}

.tab.active { background: var(--accent); color: white; }

main { flex: 1; padding: 15px; max-width: 600px; margin: 0 auto; width: 100%; }

.item-card {
    background: var(--card-bg); border: 1px solid var(--brd);
    padding: 15px; margin-bottom: 12px; border-radius: 8px;
    cursor: pointer; transition: 0.1s;
}

.item-card:active { transform: scale(0.98); }

.load-more-btn {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--brd);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--accent);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 10px;
}

.load-more-btn:hover {
    background: var(--chip-hover-bg);
    border-color: var(--accent);
}

.load-more-btn:active {
    transform: scale(0.98);
}

.type-tag {
    font-size: 0.65rem; padding: 2px 6px; border-radius: 3px;
    text-transform: uppercase; margin-right: 8px; font-weight: bold;
}
.tag-w { background: var(--tag-bg-w); color: var(--text); }
.tag-p { background: var(--tag-bg-p); color: var(--p-color); }
.tag-r { background: var(--tag-bg-r); color: var(--r-color); }
.tag-s { background: var(--tag-bg-s); color: var(--s-color); }

.title-text { font-size: 1.3rem; font-weight: bold; }

#panel {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg); z-index: 200; display: none;
    overflow-y: auto; padding: 30px 20px;
}

.close-btn { 
    background: none; border: 1px solid var(--brd);
    padding: 8px 16px; margin-bottom: 25px; cursor: pointer;
    color: var(--text);
}

.anatomy-view { text-align: center; margin: 40px 0; }

.formula {
    display: inline-flex; align-items: center; gap: 10px;
    font-size: 1.8rem; font-weight: bold; flex-wrap: wrap; justify-content: center;
}

.p-part { color: var(--p-color); }
.r-part { color: var(--r-color); }
.s-part { color: var(--s-color); }

.detail-card {
    background: var(--card-bg); border: 1px solid var(--brd);
    padding: 20px; border-radius: 12px; margin-top: 20px;
}

.section-label {
    font-size: 0.75rem; color: var(--section-label-color); text-transform: uppercase;
    letter-spacing: 1px; margin-bottom: 10px;
}

.link-chip {
    display: inline-block; padding: 6px 14px; border: 1px solid var(--brd);
    margin: 4px; border-radius: 20px; font-size: 0.9rem; cursor: pointer;
    color: var(--text);
}

.link-chip:hover { border-color: var(--accent); background: var(--chip-hover-bg); }

footer {
    padding: 40px 20px; text-align: center; border-top: 1px solid var(--brd);
    color: var(--footer-color); font-size: 0.8rem;
}

.footer-tagline {
    margin: 0 0 15px 0;
}

.external-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
}

.external-link-label {
    color: var(--section-label-color);
    font-size: 0.75rem;
}

.external-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 4px 10px;
    border: 1px solid var(--brd);
    border-radius: 4px;
    transition: all 0.2s ease;
}

.external-link:hover {
    background: var(--chip-hover-bg);
    border-color: var(--accent);
}

.tts-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    padding: 0;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--sub-text);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
    opacity: 0.6;
}

.tts-btn:hover {
    opacity: 1;
    color: var(--accent);
}

.tts-btn:active {
    transform: scale(0.95);
}

.tts-btn.tts-loading,
.tts-btn.tts-playing {
    opacity: 1;
    color: var(--accent);
}

.tts-btn.tts-loading svg,
.tts-btn.tts-playing svg {
    /* 动画已在 SVG 中实现 */
}

.tts-btn.tts-error {
    opacity: 1;
    color: #e74c3c;
}

.detail-card .tts-btn {
    width: 24px;
    height: 24px;
}

.detail-card .tts-btn svg {
    width: 16px;
    height: 16px;
}

.item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.word-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.part-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.tts-btn-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}