@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@500;700&family=Inter:wght@400;500;600&display=swap');

:root {
    --primary: #E8A2A2;
    --primary-dark: #D48D8D;
    --secondary: #9FB7D9;
    --secondary-dark: #7E96B8;
    --accent: #F9C7B7;
    --accent-dark: #C7A392;
    --bg: #FDF5F0;
    --container-bg: #FFFFFF;
    --text: #4A4A4A;
    --text-light: #6B6B6B;
    --border: #F0D9D9;
    --card-bg-start: #FFF1F1;
    --card-bg-end: #FFE4E4;
    --highlight-bg: #FFF0F0;
    --phonetic: #7A7A7A;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    --hover-shadow: 0 15px 35px rgba(232, 162, 162, 0.15);
    --gradient-start: #FDF5F0;
    --gradient-end: #FCEAE5;
}

body.night-mode {
    --primary: #D48D8D;
    --secondary: #7E96B8;
    --accent: #C7A392;
    --bg: #2A2A2A;
    --container-bg: #3A3A3A;
    --text: #FFFFFF;
    --text-light: #E0E0E0;
    --border: #5A5A5A;
    --card-bg-start: #4A4A4A;
    --card-bg-end: #5A5A5A;
    --highlight-bg: #5A4A4A;
    --phonetic: #DDDDDD;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 15px 35px rgba(180, 120, 120, 0.25);
    --gradient-start: #2D2D2D;
    --gradient-end: #3D3D3D;
}

/* 深色主题（Theme 11-20）下，强制指定区域文本为白色 */
body.dark-theme .book-intro,
body.dark-theme .translation-col,
body.dark-theme .reading-settings,
body.dark-theme .reading-settings label,
body.dark-theme .reading-settings span,
body.dark-theme .reading-settings select {
    color: #ffffff !important;
}

/* 深色主题下，中文原文列文字强制黑色 */
body.dark-theme .original-col {
    color: #000000 !important;
}

/* 夜间模式下，中文原文列文字强制白色 */
body.night-mode .original-col {
    color: #ffffff !important;
}

/* 正在播放的段落高亮为黄色 */
.paragraph-grid.playing {
    background-color: #ffffcc !important;
    transition: background-color 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    min-height: 100vh;
    transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
    max-width: 1600px;
    margin: 30px auto;
    background: var(--container-bg);
    padding: 30px 35px;
    border-radius: 28px;
    box-shadow: var(--shadow);
    position: relative;
    transition: background-color 0.25s, box-shadow 0.25s;
}

.container::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 5%;
    width: 90%;
    height: 20px;
    background: url('data:image/svg+xml;utf8,<svg width="100%" height="20" viewBox="0 0 1200 20" preserveAspectRatio="none" xmlns="http://www.w3.org/2000/svg"><path d="M0,10 Q150,0 300,10 T600,10 T900,10 T1200,10" stroke="%23E8A2A2" fill="none" stroke-width="2" opacity="0.3"/></svg>') repeat-x;
    opacity: 0.5;
}

.reading-settings {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: rgba(232, 162, 162, 0.05);
    backdrop-filter: blur(10px);
    padding: 18px 25px;
    border-radius: 50px;
    margin-bottom: 30px;
    border: 1px solid var(--border);
    overflow-x: hidden;
    width: 100%;
}

.setting-group {
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    flex: 0 1 auto;
    min-width: 0;
}

.setting-group label,
.setting-group span {
    font-weight: 500;
    color: var(--text-light);
    font-size: 0.95em;
}

#font-size,
#language-select,
.auto-next-select {
    padding: 8px 12px;
    border-radius: 30px;
    border: 1px solid var(--border);
    background: var(--container-bg);
    color: var(--text);
    cursor: pointer;
    font-size: 0.95em;
    transition: all 0.2s;
    max-width: 200px;
}

#night-mode {
    padding: 10px 18px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 40px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: background 0.25s, transform 0.2s;
    box-shadow: 0 4px 10px rgba(232, 162, 162, 0.3);
    white-space: nowrap;
    flex-shrink: 0;
}

.theme-buttons {
    display: grid;
    grid-template-columns: repeat(20, 26px);
    gap: 4px;
    flex-shrink: 1;
    min-width: 0;
}

.theme-btn {
    width: 28px;
    height: 28px;
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
}

.theme-btn:hover {
    transform: scale(1.15);
    border-color: var(--primary);
}

.theme-btn.active {
    transform: scale(0.5);
    border-color: #fff;
    box-shadow: 0 0 0 3px var(--primary);
}

#night-mode:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.breadcrumb {
    font-size: 0.95em;
    margin-bottom: 20px;
    color: var(--text-light);
    position: relative;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 20px 0;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    color: white;
    text-decoration: none;
    font-size: 1.3em;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.share-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 18px rgba(232, 162, 162, 0.4);
}

.share-btn.twitter { background: #1DA1F2; }
.share-btn.facebook { background: #4267B2; }
.share-btn.whatsapp { background: #25D366; }
.share-btn.linkedin { background: #0077b5; }

.auto-next-row {
    display: flex;
    justify-content: center;
    margin: 25px 0;
}

.auto-next-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--card-bg-start);
    padding: 8px 20px;
    border-radius: 40px;
    border: 1px solid var(--border);
}

.title-speaker-icon {
    font-size: 1.8em;
    cursor: pointer;
    transition: transform 0.2s;
    color: var(--primary);
}

.title-speaker-icon:hover {
    transform: scale(1.1);
}

.auto-next-label {
    font-weight: 500;
    color: var(--text);
}

.title-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin: 20px 0 10px;
}

.chapter-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    color: var(--text);
    font-size: 2.4em;
    text-align: center;
    position: relative;
    display: inline-block;
}

.chapter-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    margin: 12px auto 0;
    border-radius: 3px;
}

.chapter-intro {
    text-align: center;
    font-size: 1.1em;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 30px;
    line-height: 1.7;
}

.book-intro {
    text-align: left;
    font-size: 1.1em;
    color: var(--text);
    margin: 20px 0 30px;
    padding: 0 10px;
    line-height: 1.8;
}

.learning-advice {
    background: #FFF5F5;
    color: var(--text);
    padding: 25px 30px;
    margin: 30px 0;
    border-radius: 20px;
    font-size: 1.05em;
    line-height: 1.8;
    box-shadow: var(--shadow);
}

.learning-advice h3 {
    color: var(--primary);
    font-family: 'Playfair Display', serif;
    margin-top: 0;
    font-size: 1.6em;
    margin-bottom: 15px;
}

.learning-advice h4, .learning-advice h5 {
    color: var(--text);
    font-weight: 600;
    margin: 20px 0 10px;
}

.learning-advice ul, .learning-advice ol {
    padding-left: 25px;
}

.night-mode .learning-advice {
    background: #3D3D3D;
    color: #E0E0E0;
    border-left-color: var(--primary);
}

.night-mode .learning-advice h3 {
    color: var(--primary);
}

.chapter-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 30px 0;
    padding: 15px 0;
}

.nav-link {
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-decoration: none;
    border-radius: 40px;
    font-weight: 500;
    font-size: 1.05em;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(232, 162, 162, 0.25);
}

.nav-link:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(232, 162, 162, 0.4);
}

.nav-link.disabled {
    background: #E0C8C8;
    box-shadow: none;
    cursor: not-allowed;
    opacity: 0.5;
    pointer-events: none;
}

.contents-link {
    background: linear-gradient(135deg, var(--accent), #E6AFAF);
}

.grid-header {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 18px 20px;
    border-radius: 40px 40px 0 0;
    font-weight: 600;
    font-size: 1.15em;
    letter-spacing: 0.5px;
    margin-top: 20px;
}

.grid-header > div {
    text-align: center;
}

.paragraphs {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-top: 20px;
}

.paragraph-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 25px;
    padding: 25px;
    background: var(--container-bg);
    border: 1px solid var(--border);
    border-radius: 28px;
    box-shadow: var(--shadow);
    transition: all 0.25s cubic-bezier(0.25, 0.1, 0.2, 1);
}

.paragraph-grid:hover {
    transform: translateY(-4px);
    box-shadow: var(--hover-shadow);
    border-color: var(--primary);
    background-color: rgba(232, 162, 162, 0.02);
}

.paragraph-grid.index-row .original-col,
.paragraph-grid.index-row .translation-col {
    text-align: center;
}

.original-col {
    line-height: 1.8;
    font-size: 1.05em;
    padding: 15px;
    background-color: var(--card-bg-start);
    border-radius: 18px;
    word-break: break-word;
}

.speaker-icon {
    margin-right: 10px;
    font-size: 1.3em;
    vertical-align: middle;
    cursor: pointer;
    color: var(--primary);
    transition: transform 0.2s;
}

.speaker-icon:hover {
    transform: scale(1.2);
}

.translation-col {
    line-height: 1.8;
    font-size: 1.05em;
    padding: 15px;
    background-color: var(--container-bg);
    color: var(--text);
    border-radius: 18px;
    word-break: break-word;
    border: 1px dashed var(--border);
}

.vocab-col {
}

.vocabulary-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.vocab-item {
    padding: 18px 15px 15px 40px;
    background: linear-gradient(135deg, var(--card-bg-start), var(--card-bg-end));
    border-radius: 20px;
    transition: all 0.3s ease;
    border-left: 8px solid var(--primary);
    position: relative;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
}

.vocab-item:hover {
    transform: translateX(6px);
    box-shadow: 0 8px 18px rgba(232, 162, 162, 0.15);
}

.vocab-speaker {
    position: absolute;
    left: 10px;
    top: 15px;
    cursor: pointer;
    font-size: 1.3em;
    color: var(--secondary);
    transition: transform 0.2s;
}

.vocab-speaker:hover {
    transform: scale(1.2);
    color: var(--primary);
}

.word-phonetic-line {
    display: flex;
    align-items: baseline;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

.vocab-word {
    font-weight: 700;
    font-size: 1.15em;
    color: var(--text);
    letter-spacing: -0.2px;
}

.phonetic {
    color: var(--phonetic);
    font-size: 0.9em;
    font-style: italic;
}

.pos-explanation-line {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex-wrap: wrap;
}

.pos {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85em;
    text-transform: uppercase;
    background: rgba(232, 162, 162, 0.15);
    padding: 3px 10px;
    border-radius: 30px;
}

.explanation {
    font-size: 0.95em;
    color: var(--text-light);
    flex: 1;
}

.vocab-highlight {
    background: var(--highlight-bg);
    color: var(--text);
    padding: 2px 6px;
    border-radius: 12px;
    cursor: help;
    border-bottom: 2px solid var(--accent);
    font-weight: 600;
    transition: all 0.2s ease;
    display: inline-block;
}

.vocab-highlight:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(232, 162, 162, 0.4);
}

.vocab-popup {
    position: absolute;
    background: var(--container-bg);
    border: 2px solid var(--primary);
    border-radius: 24px;
    padding: 18px 22px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    z-index: 1000;
    max-width: 340px;
    font-family: 'Inter', sans-serif;
    color: var(--text);
    backdrop-filter: blur(5px);
    transition: opacity 0.2s;
}

body:not(.night-mode):not(.dark-theme) .vocab-popup {
    background: #000000;
    color: #ffffff;
    border-color: #666666;
}

body.night-mode .vocab-popup,
body.dark-theme .vocab-popup {
    background: #ffffff;
    color: #000000;
    border-color: #cccccc;
}

.vocab-popup .popup-word-line {
    font-weight: 700;
    font-size: 1.3em;
    margin-bottom: 8px;
    color: var(--primary);
}

.vocab-popup .popup-pos-line {
    font-size: 1em;
    color: var(--text-light);
    margin-bottom: 12px;
}

.vocab-popup .popup-pos-line .pos {
    background: rgba(232, 162, 162, 0.2);
    padding: 3px 10px;
    border-radius: 30px;
    margin-right: 8px;
}

.vocab-popup .popup-example {
    font-style: italic;
    color: var(--text);
    border-top: 2px solid var(--border);
    padding-top: 14px;
    margin-top: 8px;
    font-size: 0.98em;
}

body.night-mode .vocab-popup .popup-example,
body.dark-theme .vocab-popup .popup-example {
    color: var(--phonetic);
}

.vocab-popup .popup-example strong {
    color: var(--primary);
}

@media (max-width: 992px) {
    .container { padding: 20px; }
    .grid-header { display: none; }
    .paragraph-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    .original-col { grid-column: 1 / 2; }
    .translation-col { grid-column: 1 / 2; margin-top: -10px; }
    .vocab-col { grid-column: 2 / 3; grid-row: 1 / 3; }
    .theme-buttons { grid-template-columns: repeat(10, 1fr); }
}

@media (max-width: 768px) {
    .container { padding: 15px; margin: 10px; border-radius: 24px; }
    .paragraph-grid { grid-template-columns: 1fr; }
    .paragraph-grid .original-col { order: 1; }
    .paragraph-grid .translation-col { order: 2; }
    .paragraph-grid .vocab-col { order: 3; }
    .original-col, .translation-col, .vocab-col { grid-column: 1 / 2; }
    .chapter-title { font-size: 1.8em; }
    .reading-settings { flex-direction: column; align-items: stretch; border-radius: 30px; }
    .setting-group.night-group {
        justify-content: center;
        width: 100%;
    }
    .setting-group.theme-group {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    .setting-group.theme-group span {
        text-align: center;
        margin-bottom: 8px;
    }
    .theme-buttons {
        grid-template-columns: repeat(10, 1fr);
        width: 90%;
        margin: 0 auto;
    }
    .theme-btn {
        width: 100%;
        height: auto;
        aspect-ratio: 1 / 1;
        max-width: 40px;
    }
    .setting-group {
        width: 100%;
        justify-content: space-between;
    }
    .nav-link { padding: 10px 20px; font-size: 1em; }
    .vocab-popup {
        position: fixed;
        top: 50% !important;
        left: 50% !important;
        transform: translate(-50%, -50%);
        width: 90%;
        max-width: 90%;
    }
}

@media print {
    .reading-settings, .chapter-nav, .share-buttons, .auto-next-wrapper {
        display: none;
    }
    .vocab-highlight {
        background: none;
        border-bottom: 1px solid #aaa;
    }
}