/* 主样式文件 - 惊艳版 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6C63FF;
    --primary-color: #6C63FF;
    --primary-light: #8B83FF;
    --secondary: #FF6B9A;
    --secondary-color: #FF6B9A;
    --secondary-light: #FF8FB5;
    --accent: #FFD93D;
    --success: #00D2A0;
    --success-color: #00D2A0;
    --warning: #FF8C00;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --card-gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --card-gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --card-gradient-5: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --card-gradient-6: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%);
    --shadow-soft: 0 10px 40px rgba(0,0,0,0.1);
    --shadow-strong: 0 20px 60px rgba(108, 99, 255, 0.3);
    --shadow-card: 0 8px 32px rgba(0,0,0,0.12);
    --text-dark: #2D3436;
    --text-light: #636E72;
    --bg-light: #F8F9FA;
    --white: #FFFFFF;
    --border-radius: 24px;
    --border-radius-sm: 16px;
    --border-radius-xs: 12px;
}

body {
    font-family: 'Comic Sans MS', 'Chalkboard SE', 'Arial Rounded MT Bold', sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
}

#app {
    width: 100%;
    max-width: 1400px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-strong);
    overflow: hidden;
    position: relative;
    z-index: 1;
}

#app::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent), var(--success));
    z-index: 10;
}

/* 头部样式 - 更生动 */
.main-header {
    background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
    color: white;
    padding: 25px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4);
    position: relative;
    overflow: hidden;
}

.main-header::before {
    content: '★';
    position: absolute;
    font-size: 300px;
    right: -50px;
    top: -100px;
    opacity: 0.1;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo {
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 1;
}

.logo-icon {
    font-size: 48px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0) scale(1); }
    25% { transform: translateY(-10px) scale(1.1); }
    50% { transform: translateY(0) scale(1); }
    75% { transform: translateY(-5px) scale(1.05); }
}

.logo h1 {
    font-size: 36px;
    text-shadow: 3px 3px 6px rgba(0,0,0,0.2);
    letter-spacing: 2px;
    background: linear-gradient(90deg, #FFF, #FFD93D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 1;
}

.stars {
    background: rgba(255,255,255,0.2);
    padding: 12px 24px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 10px;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255,255,255,0.3);
    font-size: 20px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.stars:hover {
    transform: scale(1.1);
    background: rgba(255,255,255,0.3);
}

.star-icon {
    font-size: 28px;
    animation: spin 3s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 主内容区 */
.main-content {
    padding: 50px 40px;
    min-height: 70vh;
    background: linear-gradient(to bottom, #F8F9FA 0%, #FFF 100%);
}

.welcome-section {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.welcome-section h2 {
    color: var(--text-dark);
    font-size: 48px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
}

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

.welcome-section p {
    color: var(--text-light);
    font-size: 22px;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

/* 菜单网格 - 超炫卡片 */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.menu-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 40px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
    border: 3px solid transparent;
}

.menu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.6s ease;
}

.menu-card:hover::before {
    left: 100%;
}

.menu-card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: var(--shadow-strong);
}

.menu-card:active {
    transform: scale(0.95);
}

.card-alphabet { 
    background: var(--card-gradient-1);
    color: white;
    border-color: var(--primary);
}
.card-phonetics { 
    background: var(--card-gradient-2);
    color: white;
    border-color: var(--secondary);
}
.card-words { 
    background: var(--card-gradient-3);
    color: white;
    border-color: #4facfe;
}
.card-grammar { 
    background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%);
    color: white;
    border-color: #a18cd1;
}
.card-games { 
    background: var(--card-gradient-4);
    color: white;
    border-color: var(--success);
}
.card-progress { 
    background: var(--card-gradient-5);
    color: white;
    border-color: #fa709a;
}

.card-icon {
    font-size: 80px;
    margin-bottom: 20px;
    display: block;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.2));
}

@keyframes float {
    0%, 100% { 
        transform: translateY(0) rotate(0deg); 
    }
    25% { 
        transform: translateY(-15px) rotate(2deg); 
    }
    50% { 
        transform: translateY(-20px) rotate(0deg); 
    }
    75% { 
        transform: translateY(-15px) rotate(-2deg); 
    }
}

.menu-card h3 {
    font-size: 28px;
    margin-bottom: 12px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.menu-card p {
    font-size: 16px;
    opacity: 0.9;
}

.card-badge {
    position: absolute;
    top: 20px;
    right: -35px;
    background: var(--accent);
    color: var(--text-dark);
    padding: 8px 40px;
    font-size: 14px;
    font-weight: bold;
    transform: rotate(45deg);
    box-shadow: 0 4px 12px rgba(255, 217, 61, 0.4);
}

.card-badge.new {
    background: var(--success);
    color: white;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { 
        transform: rotate(45deg) scale(1); 
        box-shadow: 0 4px 12px rgba(0, 210, 160, 0.4);
    }
    50% { 
        transform: rotate(45deg) scale(1.1); 
        box-shadow: 0 8px 20px rgba(0, 210, 160, 0.6);
    }
}

/* 每日一句 - 超级炫 */
.daily-sentence {
    margin-top: 50px;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    color: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.daily-sentence::before {
    content: '💬';
    position: absolute;
    font-size: 200px;
    right: 30px;
    top: -30px;
    opacity: 0.15;
    animation: rotate 30s linear infinite reverse;
}

.daily-sentence h3 {
    font-size: 32px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

#dailySentence {
    font-size: 36px;
    font-weight: bold;
    margin: 25px 0;
    cursor: pointer;
    transition: all 0.3s ease;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.2);
    animation: fadeInUp 1s ease-out 0.3s backwards;
}

#dailySentence:hover {
    transform: scale(1.05);
    color: var(--accent);
}

#dailyChinese {
    font-size: 24px;
    opacity: 0.95;
    animation: fadeInUp 1s ease-out 0.5s backwards;
}

/* 底部 */
.main-footer {
    background: linear-gradient(135deg, var(--text-dark), #000);
    color: white;
    text-align: center;
    padding: 25px;
    font-size: 16px;
    position: relative;
    overflow: hidden;
}

/* ===== 霓虹光效文字 ===== */
.neon-glow {
    animation: neonPulse 2.5s ease-in-out infinite alternate;
}

@keyframes neonPulse {
    0% {
        text-shadow: 0 0 5px rgba(108,99,255,0.4), 0 0 10px rgba(108,99,255,0.2), 0 0 20px rgba(108,99,255,0.1);
        filter: brightness(1);
    }
    50% {
        text-shadow: 0 0 10px rgba(255,107,154,0.6), 0 0 20px rgba(255,107,154,0.3), 0 0 40px rgba(255,107,154,0.15), 0 0 80px rgba(255,107,154,0.05);
        filter: brightness(1.1);
    }
    100% {
        text-shadow: 0 0 8px rgba(255,217,61,0.5), 0 0 15px rgba(255,217,61,0.25), 0 0 30px rgba(255,217,61,0.1), 0 0 60px rgba(255,217,61,0.05);
        filter: brightness(1.05);
    }
}

/* ===== 波浪动画 ===== */
.wave-container {
    position: relative;
    height: 60px;
    margin-top: -1px;
    overflow: hidden;
}

.wave-svg {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 100%;
}

.wave-path {
    fill-opacity: 0.6;
}

.wave-1 {
    fill: rgba(108,99,255,0.3);
    animation: waveMove 8s linear infinite;
}

.wave-2 {
    fill: rgba(255,107,154,0.2);
    animation: waveMove 6s linear infinite reverse;
}

.wave-3 {
    fill: rgba(45,52,54,0.8);
    animation: waveMove 10s linear infinite;
}

@keyframes waveMove {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ===== 3D卡片增强 ===== */
.menu-card {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    will-change: transform;
}

.card-shine {
    transition: background 0.15s ease;
}

.main-footer::before {
    content: '★';
    position: absolute;
    font-size: 150px;
    left: -30px;
    top: -50px;
    opacity: 0.05;
}

.main-footer p {
    position: relative;
    z-index: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .menu-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .welcome-section h2 {
        font-size: 32px;
    }

    .logo h1 {
        font-size: 24px;
    }

    .menu-card {
        padding: 30px 20px;
    }

    .card-icon {
        font-size: 60px;
    }

    .main-header {
        padding: 20px;
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    #app {
        border-radius: var(--border-radius-sm);
    }

    .main-content {
        padding: 30px 20px;
    }

    .welcome-section h2 {
        font-size: 28px;
    }

    .menu-card h3 {
        font-size: 24px;
    }
}