/* ============================================
   公共样式 - 英语单词乐园 - 孟菲斯风格
   ============================================ */

/* CSS 变量 - 孟菲斯风格高饱和色彩 */
:root {
    /* 主色调 - 高饱和撞色 */
    --primary: #FF6B9D;           /* 粉红色 */
    --primary-light: #FF8FB3;
    --primary-dark: #E84A7F;
    --secondary: #FFD93D;          /* 明黄色 */
    --secondary-light: #FFE566;
    --secondary-dark: #F5C400;
    --accent-blue: #6C5CE7;        /* 紫蓝色 */
    --accent-green: #00D9A5;       /* 薄荷绿 */
    --accent-orange: #FF8C42;      /* 橙色 */
    --accent-purple: #A855F7;      /* 紫色 */
    --accent-cyan: #00CED1;        /* 青色 */
    
    /* 功能色 */
    --success: #00D9A5;
    --success-light: #7BED9F;
    --error: #FF6B6B;
    --error-light: #FF9B9B;
    --warning: #FFD93D;
    
    /* 背景色 */
    --bg: #FFF9F0;
    --bg-pattern: #FFF5E6;
    --bg-dark: #FFE4D6;
    --card-bg: #FFFFFF;
    
    /* 文字色 */
    --text: #2D3436;
    --text-secondary: #636E72;
    --text-light: #B2BEC3;
    
    /* 边框和阴影 */
    --border: #FFD6E0;
    --shadow: 4px 4px 0px rgba(0, 0, 0, 0.1);
    --shadow-hover: 6px 6px 0px rgba(0, 0, 0, 0.15);
    --shadow-colorful: 4px 4px 0px var(--accent-blue);
    
    /* 圆角 - 孟菲斯风格使用不规则圆角 */
    --radius: 20px;
    --radius-sm: 12px;
    --radius-lg: 30px;
    --radius-blob: 60% 40% 30% 70% / 60% 30% 70% 40%;
    
    /* 过渡动画 */
    --transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: all 0.2s ease;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

/* 重置样式 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

/* 孟菲斯风格背景图案 */
body {
    font-family: var(--font-family);
    background-color: var(--bg);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 107, 157, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(108, 92, 231, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 50% 50%, rgba(255, 217, 61, 0.08) 0%, transparent 30%),
        linear-gradient(135deg, transparent 25%, rgba(0, 217, 165, 0.03) 25%, rgba(0, 217, 165, 0.03) 50%, transparent 50%, transparent 75%, rgba(255, 140, 66, 0.03) 75%);
    background-size: 100% 100%, 100% 100%, 100% 100%, 40px 40px;
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

/* 装饰性几何图案 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 5% 15%, var(--primary) 2px, transparent 2px),
        radial-gradient(circle at 95% 85%, var(--accent-blue) 3px, transparent 3px),
        radial-gradient(circle at 85% 10%, var(--secondary) 2px, transparent 2px),
        radial-gradient(circle at 15% 90%, var(--accent-green) 2px, transparent 2px);
    background-size: 200px 200px, 300px 300px, 250px 250px, 180px 180px;
    pointer-events: none;
    z-index: -1;
    opacity: 0.3;
}

a {
    text-decoration: none;
    color: var(--primary);
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: var(--font-family);
}

input, textarea, select {
    font-family: var(--font-family);
    outline: none;
}

/* 布局容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* 顶部导航栏 - 孟菲斯风格 */
.navbar {
    background: linear-gradient(135deg, var(--card-bg) 0%, #FFF5F8 100%);
    border-bottom: 3px solid var(--primary);
    box-shadow: 0 4px 0 var(--secondary);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 4px;
    background: repeating-linear-gradient(
        90deg,
        var(--primary) 0px,
        var(--primary) 10px,
        transparent 10px,
        transparent 20px,
        var(--secondary) 20px,
        var(--secondary) 30px,
        transparent 30px,
        transparent 40px,
        var(--accent-blue) 40px,
        var(--accent-blue) 50px,
        transparent 50px,
        transparent 60px
    );
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 800;
    color: var(--text);
    text-shadow: 2px 2px 0 var(--secondary);
    transition: var(--transition);
}

.navbar-brand:hover {
    transform: rotate(-2deg) scale(1.02);
}

.navbar-brand .logo {
    font-size: 32px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 登录按钮 - 孟菲斯风格 */
.btn-login {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    border: 3px solid var(--text);
    padding: 10px 24px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 3px 3px 0 var(--text);
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-login:hover {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0 var(--text);
}

.btn-login:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0 var(--text);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent-orange) 100%);
    border: 3px solid var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 2px 2px 0 var(--text);
}

.user-avatar:hover {
    transform: rotate(10deg) scale(1.1);
}

/* 页面头部（带返回按钮） */
.page-header {
    background: linear-gradient(135deg, var(--card-bg) 0%, #FFF5F8 100%);
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 3px solid var(--accent-blue);
    box-shadow: 0 3px 0 var(--secondary);
    position: sticky;
    top: 0;
    z-index: 100;
}

.btn-back {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-dark) 100%);
    border: 3px solid var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text);
    box-shadow: 2px 2px 0 var(--text);
    transition: var(--transition);
}

.btn-back:hover {
    transform: translate(-2px, -2px) rotate(-5deg);
    box-shadow: 4px 4px 0 var(--text);
}

.btn-back:active {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0 var(--text);
}

.page-header h1 {
    font-size: 18px;
    font-weight: 700;
    flex: 1;
    color: var(--text);
}

/* 按钮样式 - 孟菲斯风格 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 700;
    transition: var(--transition);
    border: 3px solid var(--text);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    box-shadow: 4px 4px 0 var(--text);
}

.btn-primary:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--text);
}

.btn-primary:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 var(--text);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    color: var(--text);
    box-shadow: 4px 4px 0 var(--text);
}

.btn-secondary:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--text);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-green) 0%, #00B894 100%);
    color: #fff;
    box-shadow: 4px 4px 0 var(--text);
}

.btn-success:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--text);
}

.btn-outline {
    background: transparent;
    border: 3px solid var(--primary);
    color: var(--primary);
    box-shadow: 3px 3px 0 var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0 var(--primary);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 18px;
    border-radius: var(--radius);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    border-width: 2px;
    box-shadow: 2px 2px 0 var(--text);
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    font-size: 22px;
}

/* 卡片样式 - 孟菲斯风格 */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 3px solid var(--text);
    box-shadow: 5px 5px 0 var(--text);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 8px;
    right: 8px;
    width: 20px;
    height: 20px;
    background: var(--secondary);
    border-radius: 50%;
    border: 2px solid var(--text);
}

.card:hover {
    transform: translate(-3px, -3px) rotate(-1deg);
    box-shadow: 8px 8px 0 var(--text);
}

.card-body {
    padding: 20px;
}

/* 选项卡 - 孟菲斯风格 */
.tabs {
    display: flex;
    background: var(--card-bg);
    padding: 6px;
    border-radius: var(--radius);
    border: 3px solid var(--text);
    box-shadow: 3px 3px 0 var(--text);
    margin: 16px 0;
}

.tab {
    flex: 1;
    text-align: center;
    padding: 12px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.tab.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    transform: scale(1.02);
    box-shadow: 2px 2px 0 var(--text);
}

.tab:hover:not(.active) {
    background: var(--bg-dark);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state .icon {
    font-size: 80px;
    margin-bottom: 16px;
    animation: float 3s ease-in-out infinite;
}

.empty-state .title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.empty-state .desc {
    font-size: 14px;
    margin-bottom: 24px;
}

/* 悬浮按钮 - 孟菲斯风格 */
.fab {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent-orange) 100%);
    color: var(--text);
    border: 3px solid var(--text);
    padding: 16px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 700;
    box-shadow: 4px 4px 0 var(--text);
    z-index: 50;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.fab:hover {
    transform: translateX(-50%) translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--text);
}

.fab:active {
    transform: translateX(-50%) translate(1px, 1px);
    box-shadow: 2px 2px 0 var(--text);
}

/* 模态框 - 孟菲斯风格 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(45, 52, 54, 0.7);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 4px solid var(--text);
    box-shadow: 8px 8px 0 var(--text);
    width: 90%;
    max-width: 500px;
    max-height: 85vh;
    overflow-y: auto;
    transform: translateY(20px) rotate(2deg);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: translateY(0) rotate(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 3px solid var(--border);
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-dark) 100%);
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 2px 2px 0 var(--text);
}

.modal-close:hover {
    transform: rotate(90deg) scale(1.1);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 18px 24px;
    border-top: 3px solid var(--border);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-dark) 100%);
}

/* 表单 - 孟菲斯风格 */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 3px solid var(--text);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--text);
    background: var(--card-bg);
    transition: var(--transition);
    box-shadow: 3px 3px 0 var(--text);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 3px 3px 0 var(--primary);
    transform: translate(-1px, -1px);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    font-family: monospace;
    line-height: 1.8;
}

.form-hint {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
}

/* 标签 - 孟菲斯风格 */
.grade-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.grade-tag {
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    border: 3px solid var(--text);
    background: var(--card-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 2px 2px 0 var(--text);
}

.grade-tag.active {
    border-color: var(--primary);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0 var(--text);
}

.grade-tag:hover:not(.active) {
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0 var(--text);
}

/* 状态标签 */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 14px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    border: 2px solid var(--text);
}

.status-pending {
    background: linear-gradient(135deg, var(--warning) 0%, #F5C400 100%);
    color: var(--text);
}

.status-approved {
    background: linear-gradient(135deg, var(--success) 0%, #00B894 100%);
    color: #fff;
}

.status-rejected {
    background: linear-gradient(135deg, var(--error) 0%, #E84A7F 100%);
    color: #fff;
}

/* Toast 提示 - 孟菲斯风格 */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 14px 28px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    z-index: 999;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    white-space: nowrap;
    border: 3px solid var(--text);
    box-shadow: 4px 4px 0 var(--text);
}

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

.toast-success {
    background: linear-gradient(135deg, var(--success) 0%, #00B894 100%);
    color: #fff;
}

.toast-error {
    background: linear-gradient(135deg, var(--error) 0%, #E84A7F 100%);
    color: #fff;
}

.toast-info {
    background: linear-gradient(135deg, var(--accent-blue) 0%, #5B4ED1 100%);
    color: #fff;
}

/* Loading - 孟菲斯风格 */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-right-color: var(--secondary);
    border-bottom-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 底部信息 */
.footer {
    text-align: center;
    padding: 28px 16px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent-blue), var(--accent-green));
    border-radius: 2px;
}

/* 动画 - 孟菲斯风格增强版 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px) rotate(-2deg); }
    to { opacity: 1; transform: translateY(0) rotate(0); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0) rotate(0); }
    20%, 60% { transform: translateX(-8px) rotate(-2deg); }
    40%, 80% { transform: translateX(8px) rotate(2deg); }
}

@keyframes bounce {
    0%, 100% { transform: scale(1) rotate(0); }
    50% { transform: scale(1.1) rotate(3deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

@keyframes wiggle {
    0%, 100% { transform: rotate(-3deg); }
    50% { transform: rotate(3deg); }
}

@keyframes pop {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.animate-fadeIn {
    animation: fadeIn 0.4s ease;
}

.animate-slideUp {
    animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.animate-shake {
    animation: shake 0.5s ease;
}

.animate-bounce {
    animation: bounce 0.4s ease;
}

.animate-wiggle {
    animation: wiggle 0.5s ease-in-out;
}

.animate-pop {
    animation: pop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 孟菲斯风格装饰元素 */
.decoration-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--text);
}

.decoration-line {
    position: absolute;
    height: 3px;
    background: var(--text);
    border-radius: 2px;
}

.decoration-triangle {
    position: absolute;
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 14px solid var(--primary);
}

/* 波浪分隔线 */
.wave-divider {
    height: 30px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M321.39,56.44c58-10.79,114.16-30.13,172-41.86,82.39-16.72,168.19-17.73,250.45-.39C823.78,31,906.67,72,985.66,92.83c70.05,18.48,146.53,26.09,214.34,3V0H0V27.35A600.21,600.21,0,0,0,321.39,56.44Z' fill='%23FF6B9D' fill-opacity='0.3'/%3E%3C/svg%3E");
    background-size: cover;
}

/* 斜条纹背景 */
.striped-bg {
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255, 107, 157, 0.1) 10px,
        rgba(255, 107, 157, 0.1) 20px
    );
}

/* 圆点背景 */
.dotted-bg {
    background-image: radial-gradient(var(--primary) 1px, transparent 1px);
    background-size: 20px 20px;
}