:root {
    --bg: #f8f9fa; --text: #2d3436; --card: #ffffff;
    --accent: #3498db; --muted: #636e72; --border: #edf2f7;
    --label-bg: #ebf5ff; --label-text: #3182ce;
    --danger: #e74c3c;
}

[data-theme="dark"] {
    --bg: #121212; --text: #e0e0e0; --card: #1e1e1e;
    --accent: #64b5f6; --muted: #a0a0a0; --border: #333;
    --label-bg: #1a365d; --label-text: #90cdf4;
}

[data-theme="eye"] {
    --bg: #c7edcc; --text: #2c3e50; --card: #d9f3dc;
    --accent: #2d5a27; --muted: #5d6d5e; --border: #b2d8b7;
    --label-bg: #b9e1bd; --label-text: #1e4620;
}

[data-theme="paper"] {
    --bg: #f4ecd8; --text: #5b4636; --card: #faf4e6;
    --accent: #8c6d46; --muted: #8e7d6f; --border: #e3d5c1;
    --label-bg: #efe2cc; --label-text: #5d4037;
}

[data-theme="misty-blue"] {
    --bg: #E8EBED; --text: #5F7185; --card: #D5DDE3;
    --accent: #7898AF; --muted: #A7B4C2; --border: #A7B4C2;
    --label-bg: #C7D0D9; --label-text: #5F7185;
}

[data-theme="almond"] {
    --bg: #F0EDE8; --text: #413a35; --card: #E0D8D1;
    --accent: #A68A7E; --muted: #776d68; --border: #C9B8AE;
    --label-bg: #D8CFC5; --label-text: #403934;
}

[data-theme="sage-green"] {
    --bg: #E9ECE6; --text: #3d493f; --card: #D4DCD4;
    --accent: #8A9A8F; --muted: #565e56; --border: #A8B5A8;
    --label-bg: #C8D2C8; --label-text: #323c34;
}

[data-theme="scheme-a"] {
    --bg: #EAE8E5; --text: #6A5F5A; --card: #D8DFE5;
    --accent: #7A98A9; --muted: #726965; --border: #C5B8B2;
    --label-bg: #D8DFE5; --label-text: #6A5F5A;
}

[data-theme="scheme-b"] {
    --bg: #E9ECE6; --text: #5F6A64; --card: #D5D9D2;
    --accent: #8C8299; --muted: #C0B5C2; --border: #C0B5C2;
    --label-bg: #D5D9D2; --label-text: #5F6A64;
}

[data-theme="scheme-c"] {
    --bg: #F0EDE7; --text: #6B5A51; --card: #E0D4C9;
    --accent: #B38A7C; --muted: #545b5d; --border: #A8B2B5;
    --label-bg: #E0D4C9; --label-text: #6B5A51;
}

[data-theme="scheme-d"] {
    --bg: #EBECEA; --text: #5E6B66; --card: #DCE3E0;
    --accent: #8A9C95; --muted: #C9D0D4; --border: #C9D0D4;
    --label-bg: #DCE3E0; --label-text: #5E6B66;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body {
    background-color: var(--bg); color: var(--text);
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    margin: 0; transition: background-color 0.3s; line-height: 1.6;
}

.top-nav {
    position: sticky; top: 0; background: var(--bg); z-index: 1000;
    padding: 10px 16px; border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 8px;
    backdrop-filter: blur(8px);
}

.nav-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-bottom-row {
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo { font-weight: bold; font-size: 1rem; color: var(--accent); }
.theme-group { display: flex; gap: 4px; }
.theme-btn {
    border: 1px solid var(--border); background: var(--card); color: var(--text);
    padding: 4px 10px; border-radius: 12px; font-size: 11px; cursor: pointer;
    transition: all 0.2s; opacity: 0.8;
}
.theme-btn:hover {
    opacity: 1;
    border-color: var(--accent);
    background: var(--label-bg);
}

.theme-colors {
    display: flex;
    gap: 4px;
    justify-content: center;
}

.theme-color-btn {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    border: 1px solid rgba(0,0,0,0.3);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    flex-shrink: 0;
}

.theme-color-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.theme-color-btn.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

.theme-color-btn[data-theme="light"] { background: #f8f9fa; border: 1px solid #edf2f7; }
.theme-color-btn[data-theme="misty-blue"] { background: #E8EBED; }
.theme-color-btn[data-theme="almond"] { background: #F0EDE8; }
.theme-color-btn[data-theme="sage-green"] { background: #E9ECE6; }
.theme-color-btn[data-theme="scheme-a"] { background: #EAE8E5; }
.theme-color-btn[data-theme="scheme-b"] { background: #E9ECE6; }
.theme-color-btn[data-theme="scheme-c"] { background: #F0EDE7; }
.theme-color-btn[data-theme="scheme-d"] { background: #EBECEA; }
.theme-color-btn[data-theme="paper"] { background: #f4ecd8; }
.theme-color-btn[data-theme="eye"] { background: #c7edcc; }
.theme-color-btn[data-theme="dark"] { background: #1e1e1e; }

.toggle-btn {
    background: var(--accent);
    color: white !important;
    border: none;
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 12px;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
    transition: all 0.2s;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}
.toggle-btn:active {
    transform: scale(0.95);
}
.toggle-btn svg { width: 14px; height: 14px; fill: currentColor; }

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 15px;
    padding-left: 60px;
    margin-top: 0;
}

.nav-dots {
    display: flex;
    opacity: 1;
    transition: opacity 0.3s ease;
    position: fixed;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    flex-direction: column;
    gap: 12px;
    z-index: 999;
    cursor: grab;
    user-select: none;
    padding: 20px 10px;
    touch-action: none;
    width: 30px;
}
.nav-dots:active { cursor: grabbing; }
.nav-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid var(--border);
}
.nav-dot:hover { transform: scale(1.3); }
.nav-dot.active {
    background: var(--accent);
    border-color: var(--accent);
    transform: scale(1.4);
}

header { margin-bottom: 25px; padding-bottom: 20px; border-bottom: 2px solid var(--border); }
.title-cn { font-size: 1.6rem; margin: 0; font-weight: 800; color: var(--text); }
.title-en { font-size: 1rem; margin: 5px 0 10px 0; color: var(--muted); font-family: 'Georgia', serif; font-style: italic; }

.card {
    background: var(--card); border-radius: 12px; padding: 20px; margin-bottom: 40px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05); border: 1px solid var(--border);
    transition: box-shadow 0.3s ease;
    position: relative;
}

.card.playing-audio {
    box-shadow: 0 4px 20px rgba(52, 152, 219, 0.25), 0 0 0 2px var(--accent);
}

.card-head { 
    display: flex; 
    align-items: flex-start; 
    gap: 12px; 
    margin-bottom: 10px; 
    position: relative; 
}
.card.collapsed { padding: 15px 20px; }

.trans-section, .analysis-box {
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    max-height: 500px;
    opacity: 1;
    transform: translateY(0);
}

.card.collapsed .trans-section,
.card.collapsed .analysis-box {
    max-height: 0;
    opacity: 0;
    margin: 0;
    padding: 0;
    transform: translateY(-10px);
    pointer-events: none;
}
.num {
    background: var(--accent); color: #fff; width: 20px; height: 20px;
    border-radius: 4px; display: flex; align-items: center; justify-content: center;
    font-size: 11px; font-weight: bold; flex-shrink: 0; margin-top: 4px;
}

.en-text {
    flex: 1;
    padding-right: 10px;
    font-family: 'Georgia', serif; font-size: 1.2rem; font-weight: 500; line-height: 1.4; color: var(--text);
    letter-spacing: 0.3px;
}

/* 播放按钮状态样式 */
.play-btn {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 26px; height: 26px; padding: 0 8px; border-radius: 13px; 
    background: var(--label-bg); color: var(--label-text);
    cursor: pointer; vertical-align: middle;
    transition: all 0.2s ease; border: none; font-size: 10px; font-weight: bold;
    flex-shrink: 0;
}
.play-btn svg { width: 14px; height: 14px; fill: currentColor; }
.play-btn.loading, .play-btn.playing { cursor: not-allowed; opacity: 0.8; }
.play-btn.error { background: var(--danger); color: white; }

.card-toggle-btn {
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--muted);
    cursor: pointer;
    padding: 2px 20px;
    border-radius: 0 0 10px 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.card-toggle-btn:hover {
    color: var(--accent);
    background: var(--label-bg);
}
.card:not(.collapsed) .card-toggle-btn {
    transform: translateX(-50%) rotate(180deg);
    bottom: -22px;
}
.card-toggle-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.trans-section { margin-top: 15px; display: grid; gap: 10px; }
.trans-box { padding: 12px; border-radius: 8px; font-size: 0.95rem; position: relative; }
.label-tag {
    font-size: 10px; font-weight: bold; background: rgba(0,0,0,0.1);
    padding: 2px 6px; border-radius: 4px; margin-bottom: 6px; display: inline-block;
}

.literal-box { background: var(--bg); border: 1px solid var(--border); }
.elegant-box { background: var(--label-bg); color: var(--label-text); font-weight: 500; }

.analysis-box {
    margin-top: 15px; padding-top: 15px; border-top: 1px dashed var(--border);
    font-size: 0.9rem; color: var(--muted); line-height: 1.7;
}
.analysis-box b { color: var(--accent); font-weight: 600; }

footer { text-align: center; padding: 40px 10px; font-size: 0.8rem; color: var(--muted); border-top: 1px solid var(--border); }