/* ========== 视唱练耳训练页专属样式 ========== */
/* 版本: 1.0.0 | 栏目: 音乐-视唱练耳 | 作者: 芦笛 */

:root {
    --color-ear-primary: #5B7B7A;
    --color-ear-dark: #3D5A59;
    --color-ear-light: #7A9B9A;
    --color-ear-accent: #8BA5A4;
    --color-ear-gold: #C4A77D;
    --color-ear-pale: #E8F0EF;
}

/* ===== 页面头部 ===== */
.ear-header {
    position: relative;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #3D5A59, #5B7B7A, #4D6564, #2D4544);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    overflow: hidden;
}

.ear-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.025'%3E%3Cpath d='M50 50h-5v5h5v-5zm0-40h-5v5h5v-5zM10 50H5v5h5v-5zM10 10H5v5h5v-5z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.ear-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--color-cream);
    clip-path: ellipse(70% 100% at 50% 100%);
}

.header-ear-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.25;
}

.ear-header .page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    max-width: 800px;
}

.ear-header .page-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--space-sm);
    letter-spacing: 12px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.ear-header .page-subtitle {
    font-size: 1rem;
    opacity: 0.75;
    max-width: 600px;
    margin: 0 auto;
    line-height: 2;
    font-weight: 300;
    letter-spacing: 1px;
}

/* ===== 功能概览区 ===== */
.ear-intro-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--color-cream);
}

.ear-intro-container {
    max-width: 1200px;
    margin: 0 auto;
}

.ear-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

@media (max-width: 968px) {
    .ear-intro-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

.ear-intro-text h2 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 3px;
    line-height: 1.4;
}

.ear-intro-text p {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 2;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.ear-intro-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.ear-feature-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(91, 123, 122, 0.08);
    color: var(--color-ear-primary);
    font-size: 0.8rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    border: 1px solid rgba(91, 123, 122, 0.12);
}

.ear-intro-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, #E8F0EF, #D5E0DF);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.ear-intro-visual canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ===== 五大模块卡片区 ===== */
.modules-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.modules-container {
    max-width: 1200px;
    margin: 0 auto;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
    .modules-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .modules-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .modules-grid {
        grid-template-columns: 1fr;
    }
}

.module-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-md);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-ear-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-normal);
}

.module-card:hover, .module-card.active {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.module-card:hover::before, .module-card.active::before {
    transform: scaleX(1);
}

.module-card.active {
    background: linear-gradient(135deg, #E8F0EF, #D5E0DF);
    border: 2px solid var(--color-ear-primary);
}

.module-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-ear-light), var(--color-ear-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-size: 1.6rem;
    color: white;
    transition: var(--transition-fast);
}

.module-card:hover .module-icon {
    transform: scale(1.1) rotate(-5deg);
}

.module-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.module-name-en {
    font-size: 0.7rem;
    color: var(--color-warm-gray);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.module-desc {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    font-weight: 300;
}

/* ===== 训练交互区 ===== */
.training-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.training-container {
    max-width: 1000px;
    margin: 0 auto;
}

.training-panel {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    overflow: hidden;
}

.training-header {
    background: linear-gradient(135deg, var(--color-ear-dark), var(--color-ear-primary));
    color: white;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.training-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.training-subtitle {
    font-size: 0.85rem;
    opacity: 0.7;
    font-weight: 300;
}

.training-stats {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.7rem;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.training-body {
    padding: var(--space-xl);
}

/* 播放控制区 */
.play-control {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.play-btn {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-ear-primary), var(--color-ear-dark));
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: 0 8px 24px rgba(91, 123, 122, 0.3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.play-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 12px 32px rgba(91, 123, 122, 0.4);
}

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

.play-btn.playing {
    animation: pulse-glow 1.5s ease infinite;
}

.play-hint {
    margin-top: var(--space-sm);
    font-size: 0.85rem;
    color: var(--color-warm-gray);
}

/* 答题选项区 */
.answer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

@media (max-width: 768px) {
    .answer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.answer-btn {
    padding: var(--space-md) var(--space-sm);
    background: var(--color-cream);
    border: 2px solid rgba(30, 30, 36, 0.06);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-dark);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
    letter-spacing: 1px;
}

.answer-btn:hover {
    border-color: var(--color-ear-primary);
    background: rgba(91, 123, 122, 0.04);
    transform: translateY(-2px);
}

.answer-btn.correct {
    background: rgba(76, 175, 80, 0.1);
    border-color: #4CAF50;
    color: #2E7D32;
}

.answer-btn.wrong {
    background: rgba(244, 67, 54, 0.1);
    border-color: #F44336;
    color: #C62828;
}

.answer-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* 反馈区 */
.feedback-area {
    text-align: center;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
}

.feedback-area.correct {
    background: rgba(76, 175, 80, 0.08);
    border: 1px solid rgba(76, 175, 80, 0.2);
}

.feedback-area.wrong {
    background: rgba(244, 67, 54, 0.08);
    border: 1px solid rgba(244, 67, 54, 0.2);
}

.feedback-text {
    font-size: 1.1rem;
    font-weight: 600;
}

.feedback-detail {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
}

/* 设置区 */
.settings-row {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-cream);
    border-radius: var(--radius-md);
}

.setting-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.setting-label {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    font-weight: 500;
}

.setting-select {
    padding: 6px 12px;
    border: 1px solid rgba(30, 30, 36, 0.1);
    border-radius: var(--radius-sm);
    background: white;
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-dark);
    cursor: pointer;
}

/* 进度条 */
.progress-bar-wrap {
    margin-bottom: var(--space-lg);
}

.progress-bar {
    height: 8px;
    background: var(--color-cream);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-ear-primary), var(--color-ear-light));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.progress-text {
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    margin-top: 6px;
}

/* 操作按钮区 */
.action-btns {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 乐理参考区 ===== */
.theory-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.theory-container {
    max-width: 1200px;
    margin: 0 auto;
}

.theory-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .theory-grid {
        grid-template-columns: 1fr;
    }
}

.theory-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.theory-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.theory-card h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.theory-card canvas {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    background: white;
    margin-bottom: var(--space-sm);
}

.theory-desc {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
}

.theory-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
    margin-top: var(--space-sm);
}

.theory-table th,
.theory-table td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid rgba(30, 30, 36, 0.06);
}

.theory-table th {
    font-weight: 600;
    color: var(--color-dark);
    background: rgba(91, 123, 122, 0.06);
}

.theory-table td {
    color: var(--color-warm-gray);
}

.theory-table tr:hover td {
    background: rgba(91, 123, 122, 0.03);
}

/* ===== 使用指南区 ===== */
.guide-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.guide-container {
    max-width: 1200px;
    margin: 0 auto;
}

.guide-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
    .guide-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .guide-grid {
        grid-template-columns: 1fr;
    }
}

.guide-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.guide-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-ear-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-normal);
}

.guide-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.guide-card:hover::before {
    transform: scaleX(1);
}

.guide-step-num {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-ear-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.guide-card h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.guide-card p {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
}

/* ===== 技术说明区 ===== */
.tech-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.tech-container {
    max-width: 1200px;
    margin: 0 auto;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .tech-grid {
        grid-template-columns: 1fr;
    }
}

.tech-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-md);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.tech-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.tech-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-ear-light), var(--color-ear-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-size: 1.3rem;
    color: white;
}

.tech-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.tech-desc {
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    font-weight: 300;
}

/* ===== CTA ===== */
.ear-cta {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(135deg, var(--color-ear-dark), #2D4544, var(--color-ear-primary));
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.ear-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
    .ear-header .page-title {
        letter-spacing: 4px;
    }
    .training-header {
        flex-direction: column;
        text-align: center;
    }
    .training-body {
        padding: var(--space-md);
    }
    .answer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .settings-row {
        flex-direction: column;
        align-items: stretch;
    }
    .setting-group {
        justify-content: space-between;
    }
}

/* ===== 节奏训练特殊样式 ===== */
.rhythm-pad {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.rhythm-btn {
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    background: var(--color-cream);
    border: 2px solid rgba(30, 30, 36, 0.06);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.rhythm-btn:hover {
    border-color: var(--color-ear-primary);
    background: rgba(91, 123, 122, 0.04);
}

.rhythm-btn.tapped {
    background: var(--color-ear-primary);
    color: white;
    border-color: var(--color-ear-primary);
    transform: scale(0.95);
}

.rhythm-sequence {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.rhythm-note {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: var(--color-cream);
    border: 2px solid rgba(30, 30, 36, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    transition: var(--transition-fast);
}

.rhythm-note.played {
    background: var(--color-ear-primary);
    color: white;
    border-color: var(--color-ear-primary);
}

/* ===== 旋律训练特殊样式 ===== */
.melody-sequence {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.melody-slot {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--color-cream);
    border: 2px dashed rgba(30, 30, 36, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-dark);
    transition: var(--transition-fast);
}

.melody-slot.filled {
    border-style: solid;
    border-color: var(--color-ear-primary);
    background: rgba(91, 123, 122, 0.06);
}

.melody-slot.correct {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    color: #2E7D32;
}

.melody-slot.wrong {
    border-color: #F44336;
    background: rgba(244, 67, 54, 0.1);
    color: #C62828;
}

/* ===== 频谱可视化区 ===== */
.spectrum-viz {
    width: 100%;
    height: 120px;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, #1A1A2E, #16213E);
    margin-bottom: var(--space-lg);
    overflow: hidden;
}