/* 公共样式 - 蓝绿色主题 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #0ea5e9;
    --success-color: #10b981;
    --text-color: #1f2937;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --bg-color: #f8fafc;
    --bg-primary: #f8fafc;
    --bg-card: #ffffff;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    background-color: #45a049;
}

.btn-secondary {
    background-color: #f0f0f0;
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: #e0e0e0;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

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

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    z-index: 10000;
    animation: slideDown 0.3s ease;
}

.toast.success {
    background-color: var(--success-color);
}

.toast.error {
    background-color: var(--danger-color);
}

.toast.warning {
    background-color: var(--warning-color);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state::before {
    content: '📭';
    display: block;
    font-size: 48px;
    margin-bottom: 16px;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* 弹窗遮罩 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 10000;
    display: flex;
    align-items: flex-end;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    display: flex;
    justify-content: space-around;
    padding: 8px 0;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    padding: 8px 16px;
    transition: all 0.3s;
}

.bottom-nav .nav-item.active {
    color: var(--primary-color);
}

.bottom-nav .nav-icon {
    font-size: 24px;
    margin-bottom: 4px;
}

.bottom-nav .nav-label {
    font-size: 12px;
}

/* 有底部导航时的页面内边距 */
body {
    padding-bottom: 70px;
}

/* 按钮hover效果优化 */
.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-secondary:hover {
    background-color: var(--bg-color);
}

.btn-danger:hover {
    opacity: 0.9;
}