/**
 * 探秘中华——地域文化词汇互动学习平台
 * 样式文件 style.css
 * 
 * 响应式设计，适配电脑、平板、手机等不同设备
 */

/* ======================== 基础重置 ======================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary-red: #C41E3A;
    --primary-gold: #D4AF37;
    --primary-dark: #2C3E50;
    --bg-light: #FFF8F0;
    --bg-card: #FFFFFF;
    --text-main: #2C3E50;
    --text-light: #7F8C8D;
    --text-white: #FFFFFF;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 6px 30px rgba(0, 0, 0, 0.12);
    --shadow-strong: 0 8px 40px rgba(0, 0, 0, 0.16);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--bg-light);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ======================== 通用组件 ======================== */
.page {
    display: none;
    min-height: 100vh;
    animation: fadeIn 0.5s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

@keyframes confetti {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(400px) rotate(360deg); opacity: 0; }
}

/* ======================== 导航栏 ======================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-red), #A0172F);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(196, 30, 58, 0.3);
}

.navbar-brand {
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.navbar-brand .logo {
    font-size: 1.5rem;
}

.navbar-menu {
    display: flex;
    gap: 5px;
    list-style: none;
}

.navbar-menu li {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    white-space: nowrap;
}

.navbar-menu li:hover {
    background: rgba(255, 255, 255, 0.2);
}

.navbar-menu li.active {
    background: rgba(255, 255, 255, 0.25);
    font-weight: 600;
}

.navbar-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-white);
}

/* 音效开关按钮 */
#soundToggle {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-white);
    padding: 0 8px;
    transition: var(--transition);
    border-radius: var(--radius-sm);
}
#soundToggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ======================== 首页 ======================== */
.home-container {
    padding-top: 60px;
    min-height: 100vh;
    background: linear-gradient(135deg, #FFF8F0 0%, #FFE8D6 50%, #FFD4B8 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.home-container::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(196, 30, 58, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.home-container::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.home-content {
    text-align: center;
    z-index: 1;
    padding: 40px 20px;
    max-width: 900px;
}

.home-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--primary-red);
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    animation: slideInLeft 0.8s ease;
}

.home-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 8px;
    animation: slideInRight 0.8s ease;
}

.home-tagline {
    font-size: 1rem;
    color: var(--primary-gold);
    margin-bottom: 30px;
    font-weight: 500;
}

.student-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 20px 30px;
    box-shadow: var(--shadow-soft);
    margin: 0 auto 30px;
    max-width: 500px;
    border-left: 4px solid var(--primary-red);
    animation: fadeIn 1s ease 0.3s both;
}

.student-card h3 {
    color: var(--primary-red);
    font-size: 1rem;
    margin-bottom: 10px;
}

.student-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    text-align: left;
}

.student-info-grid .info-item {
    font-size: 0.9rem;
}

.student-info-grid .info-label {
    color: var(--text-light);
    font-size: 0.8rem;
}

.student-info-grid .info-value {
    color: var(--text-main);
    font-weight: 600;
}

.home-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeIn 1s ease 0.5s both;
}

.btn {
    padding: 14px 32px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-red), #A0172F);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(196, 30, 58, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(196, 30, 58, 0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--primary-red);
    border: 2px solid var(--primary-red);
}

.btn-secondary:hover {
    background: var(--primary-red);
    color: var(--text-white);
}

.btn-gold {
    background: linear-gradient(135deg, var(--primary-gold), #B8941F);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.btn-gold:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(212, 175, 55, 0.4);
}

/* 首页装饰元素 */
.home-decorations {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
}

.float-icon {
    position: absolute;
    font-size: 2rem;
    opacity: 0.15;
    animation: bounce 3s ease-in-out infinite;
}

.float-icon:nth-child(1) { top: 15%; left: 10%; animation-delay: 0s; }
.float-icon:nth-child(2) { top: 25%; right: 15%; animation-delay: 0.5s; }
.float-icon:nth-child(3) { bottom: 20%; left: 12%; animation-delay: 1s; }
.float-icon:nth-child(4) { bottom: 30%; right: 10%; animation-delay: 1.5s; }
.float-icon:nth-child(5) { top: 50%; left: 5%; animation-delay: 2s; }
.float-icon:nth-child(6) { top: 60%; right: 5%; animation-delay: 2.5s; }

/* ======================== 文化地图页 ======================== */
.map-page {
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.page-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 0 20px;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-red);
    margin-bottom: 8px;
}

.page-desc {
    color: var(--text-light);
    font-size: 1rem;
}

.map-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
}

.china-map {
    width: 100%;
    aspect-ratio: 5 / 4;
    background: linear-gradient(135deg, #F0F8FF, #E6F3FF);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    border: 2px solid rgba(196, 30, 58, 0.1);
}

.map-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(196, 30, 58, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(196, 30, 58, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.region-pin {
    position: absolute;
    transform: translate(-50%, -50%);
    cursor: pointer;
    transition: var(--transition);
    z-index: 2;
}

.region-pin:hover {
    transform: translate(-50%, -50%) scale(1.2);
    z-index: 3;
}

.region-pin .pin-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    border: 3px solid white;
    transition: var(--transition);
}

.region-pin:hover .pin-circle {
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.25);
}

.region-pin .pin-label {
    position: absolute;
    top: 55px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: var(--shadow-soft);
    opacity: 0;
    transition: var(--transition);
}

.region-pin:hover .pin-label {
    opacity: 1;
    top: 60px;
}

.region-pin.explored .pin-circle::after {
    content: '✓';
    position: absolute;
    top: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    background: #27AE60;
    color: white;
    border-radius: 50%;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid white;
}

/* ======================== 地区详情页 ======================== */
.region-detail-page {
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.region-header {
    text-align: center;
    padding: 30px 20px;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    margin-bottom: 30px;
}

.region-header h2 {
    font-size: 2.2rem;
    color: white;
    margin-bottom: 8px;
}

.region-header .region-provinces {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    margin-bottom: 15px;
}

.region-header .region-intro {
    max-width: 700px;
    margin: 0 auto;
    color: rgba(255, 255, 255, 0.95);
    font-size: 0.95rem;
    line-height: 1.8;
}

.culture-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.culture-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
    cursor: pointer;
}

.culture-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.culture-card-header {
    padding: 20px;
    text-align: center;
    color: white;
}

.culture-card-header .card-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.culture-card-header .card-name {
    font-size: 1.2rem;
    font-weight: 700;
}

.culture-card-body {
    padding: 20px;
}

.culture-card-body p {
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 12px;
    line-height: 1.7;
}

.culture-card-body .vocab-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.vocab-tag {
    background: #FFF0F3;
    color: var(--primary-red);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.region-facts {
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

.facts-title {
    font-size: 1.3rem;
    color: var(--primary-red);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.fact-item {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    margin-bottom: 8px;
    box-shadow: var(--shadow-soft);
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9rem;
}

.fact-item .fact-icon {
    color: var(--primary-gold);
    font-size: 1.1rem;
}

.back-btn {
    margin: 0 20px 20px;
}

/* ======================== 词汇学堂页 ======================== */
.vocab-page {
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.vocab-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    padding: 0 20px;
    flex-wrap: wrap;
}

.region-filter {
    padding: 8px 16px;
    border: 2px solid var(--primary-red);
    border-radius: 20px;
    background: white;
    color: var(--primary-red);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.region-filter.active {
    background: var(--primary-red);
    color: white;
}

.region-filter:hover {
    transform: translateY(-2px);
}

.flashcard-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    perspective: 1000px;
}

.flashcard {
    width: 100%;
    height: 350px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    box-shadow: var(--shadow-medium);
}

.flashcard-front {
    background: linear-gradient(135deg, #FFF8F0, #FFE8D6);
    border: 2px solid var(--primary-gold);
}

.flashcard-back {
    background: linear-gradient(135deg, var(--primary-red), #A0172F);
    color: white;
    transform: rotateY(180deg);
}

.flashcard-word {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-red);
    margin-bottom: 10px;
}

.flashcard-pinyin {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.flashcard-level {
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.level-初级 { background: #E8F5E9; color: #27AE60; }
.level-中级 { background: #FFF3E0; color: #F39C12; }
.level-高级 { background: #FCE4EC; color: #E74C3C; }

.flashcard-back .back-label {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-bottom: 5px;
}

.flashcard-back .back-meaning {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-align: center;
}

.flashcard-back .back-example {
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 15px;
}

.flashcard-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 20px;
}

.nav-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--primary-red);
    color: white;
    font-size: 1.3rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(196, 30, 58, 0.3);
}

.nav-btn:disabled {
    background: #CCC;
    cursor: not-allowed;
    transform: none;
}

.card-counter {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 600;
}

.pronounce-btn {
    margin-top: 15px;
    padding: 8px 20px;
    border: 2px solid var(--primary-gold);
    border-radius: 20px;
    background: white;
    color: var(--primary-gold);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.pronounce-btn:hover {
    background: var(--primary-gold);
    color: white;
}

.vocab-list {
    max-width: 800px;
    margin: 30px auto;
    padding: 0 20px;
}

.vocab-list-title {
    font-size: 1.2rem;
    color: var(--primary-red);
    margin-bottom: 15px;
}

.vocab-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
}

.vocab-item {
    background: white;
    border-radius: var(--radius-sm);
    padding: 12px;
    box-shadow: var(--shadow-soft);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    border-left: 3px solid transparent;
}

.vocab-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.vocab-item.learned {
    border-left-color: #27AE60;
}

.vocab-item .vi-word {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-red);
}

.vocab-item .vi-pinyin {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 2px;
}

.vocab-item .vi-meaning {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ======================== 测验页 ======================== */
.quiz-page {
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.quiz-setup {
    max-width: 600px;
    margin: 40px auto;
    padding: 20px;
    text-align: center;
}

.quiz-region-select {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin: 20px 0;
}

.quiz-region-btn {
    padding: 16px;
    border: 2px solid #EEE;
    border-radius: var(--radius-md);
    background: white;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.quiz-region-btn:hover {
    border-color: var(--primary-red);
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.quiz-region-btn .qr-icon {
    font-size: 2rem;
    margin-bottom: 5px;
}

.quiz-region-btn .qr-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.quiz-region-btn .qr-status {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 3px;
}

.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    padding: 20px;
}

.quiz-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #EEE;
    border-radius: 4px;
    margin: 0 15px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-red), var(--primary-gold));
    border-radius: 4px;
    transition: width 0.3s ease;
}

.quiz-question {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-medium);
    margin-bottom: 20px;
}

.question-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 20px;
    line-height: 1.6;
}

.question-number {
    color: var(--primary-red);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-option {
    padding: 16px 20px;
    border: 2px solid #EEE;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    background: white;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 12px;
}

.quiz-option:hover {
    border-color: var(--primary-red);
    background: #FFF8F0;
}

.quiz-option .option-letter {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #F5F5F5;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-light);
    flex-shrink: 0;
}

.quiz-option.correct {
    border-color: #27AE60;
    background: #E8F5E9;
}

.quiz-option.correct .option-letter {
    background: #27AE60;
    color: white;
}

.quiz-option.wrong {
    border-color: #E74C3C;
    background: #FDEDEC;
    animation: shake 0.4s;
}

.quiz-option.wrong .option-letter {
    background: #E74C3C;
    color: white;
}

.quiz-option.disabled {
    pointer-events: none;
}

.quiz-explanation {
    margin-top: 15px;
    padding: 15px;
    background: #F0F8FF;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-main);
    display: none;
    border-left: 4px solid var(--primary-gold);
}

.quiz-explanation.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

.quiz-result {
    text-align: center;
    padding: 40px 20px;
}

.result-score {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-red);
    margin: 10px 0;
}

.result-message {
    font-size: 1.2rem;
    color: var(--text-main);
    margin-bottom: 20px;
}

.result-stars {
    font-size: 2rem;
    margin-bottom: 20px;
}

/* ======================== 配对游戏页 ======================== */
.match-page {
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.match-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.match-info {
    text-align: center;
    margin-bottom: 25px;
}

.match-score {
    display: inline-flex;
    align-items: center;
    gap: 15px;
    background: white;
    padding: 10px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
}

.match-score .ms-item {
    font-size: 1rem;
    font-weight: 600;
}

.match-score .ms-correct { color: #27AE60; }
.match-score .ms-wrong { color: #E74C3C; }

.match-board {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 20px;
}

.match-column {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.match-column-title {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-red);
    margin-bottom: 5px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-red);
}

.match-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    border: 2px solid transparent;
    user-select: none;
}

.match-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.match-card.selected {
    border-color: var(--primary-gold);
    background: #FFFBF0;
    transform: scale(1.03);
}

.match-card.matched {
    background: #E8F5E9;
    border-color: #27AE60;
    cursor: default;
    opacity: 0.6;
}

.match-card.wrong-match {
    border-color: #E74C3C;
    background: #FDEDEC;
    animation: shake 0.4s;
}

.match-card .mc-emoji {
    font-size: 1.8rem;
    margin-bottom: 5px;
}

.match-card .mc-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
}

.match-complete {
    text-align: center;
    padding: 40px 20px;
    display: none;
}

.match-complete.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

/* ======================== 成就页 ======================== */
.achievement-page {
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.achievement-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    max-width: 800px;
    margin: 0 auto 30px;
    padding: 0 20px;
}

.stat-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.stat-card .stat-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.stat-card .stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-red);
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 3px;
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.achievement-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.achievement-card.unlocked {
    border: 2px solid var(--primary-gold);
}

.achievement-card.locked {
    opacity: 0.5;
    filter: grayscale(1);
}

.achievement-card .ach-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.achievement-card .ach-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 5px;
}

.achievement-card .ach-desc {
    font-size: 0.8rem;
    color: var(--text-light);
}

.achievement-card .ach-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--primary-gold);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7rem;
    display: none;
}

.achievement-card.unlocked .ach-badge {
    display: block;
}

/* ======================== 庆祝特效 ======================== */
.celebration-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
    display: none;
}

.celebration-overlay.show {
    display: block;
}

.confetti-piece {
    position: absolute;
    width: 10px;
    height: 10px;
    animation: confetti 2s ease-out forwards;
}

/* ======================== Toast 提示 ======================== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--primary-dark);
    color: white;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    z-index: 10000;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-medium);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.success { background: #27AE60; }
.toast.error { background: #E74C3C; }

/* ======================== 响应式适配 ======================== */

/* 平板 (768px - 1024px) */
@media (max-width: 1024px) {
    .navbar-menu {
        gap: 3px;
    }
    
    .navbar-menu li {
        padding: 6px 10px;
        font-size: 0.85rem;
    }
    
    .home-title {
        font-size: 2.2rem;
    }
    
    .culture-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 手机 (< 768px) */
@media (max-width: 768px) {
    .navbar {
        padding: 0 15px;
    }
    
    .navbar-brand {
        font-size: 0.95rem;
    }
    
    .navbar-brand .logo {
        font-size: 1.2rem;
    }
    
    .navbar-menu {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-red), #A0172F);
        flex-direction: column;
        padding: 10px 0;
        gap: 0;
        box-shadow: var(--shadow-medium);
    }
    
    .navbar-menu.show {
        display: flex;
    }
    
    .navbar-menu li {
        padding: 12px 20px;
        font-size: 0.95rem;
        border-radius: 0;
    }
    
    .navbar-toggle {
        display: block;
    }
    
    .home-title {
        font-size: 1.8rem;
    }
    
    .home-subtitle {
        font-size: 1rem;
    }
    
    .home-tagline {
        font-size: 0.85rem;
    }
    
    .student-card {
        padding: 15px 20px;
        margin: 0 10px 20px;
    }
    
    .student-info-grid {
        grid-template-columns: 1fr;
        gap: 6px;
    }
    
    .home-buttons {
        flex-direction: column;
        width: 100%;
        padding: 0 30px;
    }
    
    .home-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .page-desc {
        font-size: 0.9rem;
    }
    
    .region-pin .pin-circle {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .region-header h2 {
        font-size: 1.6rem;
    }
    
    .region-header .region-intro {
        font-size: 0.85rem;
    }
    
    .culture-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .flashcard {
        height: 280px;
    }
    
    .flashcard-word {
        font-size: 2.2rem;
    }
    
    .flashcard-pinyin {
        font-size: 1.2rem;
    }
    
    .flashcard-back .back-meaning {
        font-size: 1.2rem;
    }
    
    .flashcard-back .back-example {
        font-size: 0.9rem;
    }
    
    .quiz-question {
        padding: 20px;
    }
    
    .question-text {
        font-size: 1.1rem;
    }
    
    .quiz-option {
        padding: 12px 15px;
        font-size: 0.9rem;
    }
    
    .match-board {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .match-card {
        padding: 12px;
    }
    
    .match-card .mc-emoji {
        font-size: 1.5rem;
    }
    
    .match-card .mc-text {
        font-size: 0.85rem;
    }
    
    .achievement-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .achievement-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-card .stat-value {
        font-size: 1.5rem;
    }
    
    .vocab-controls {
        gap: 6px;
    }
    
    .region-filter {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    .vocab-items {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .result-score {
        font-size: 2.2rem;
    }
}

/* 小手机 (< 480px) */
@media (max-width: 480px) {
    .home-title {
        font-size: 1.5rem;
    }
    
    .home-subtitle {
        font-size: 0.9rem;
    }
    
    .home-buttons {
        padding: 0 20px;
    }
    
    .navbar-brand {
        font-size: 0.85rem;
    }
    
    .flashcard-word {
        font-size: 1.8rem;
    }
    
    .flashcard-pinyin {
        font-size: 1rem;
    }
    
    .quiz-region-select {
        grid-template-columns: 1fr;
    }
    
    .vocab-items {
        grid-template-columns: 1fr;
    }
    
    .achievement-stats {
        grid-template-columns: 1fr;
    }
}

/* 横屏手机适配 */
@media (max-height: 500px) and (orientation: landscape) {
    .navbar {
        height: 50px;
    }
    
    .home-container {
        padding-top: 50px;
        justify-content: flex-start;
    }
    
    .home-content {
        padding: 20px;
    }
    
    .home-title {
        font-size: 1.6rem;
    }
    
    .student-card {
        margin-bottom: 15px;
    }
    
    .home-buttons {
        margin-top: 10px;
    }
}