/* 基础样式 */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --success-color: #4cc9f0;
    --warning-color: #f72585;
    --danger-color: #7209b7;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --border-radius: 12px;
    --box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 1200px;
    overflow: hidden;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 15px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* 用户信息 */
.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 20px;
    border-radius: 50px;
    backdrop-filter: blur(10px);
}

#current-user {
    font-weight: 500;
}

/* 控制面板 */
.control-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background: var(--light-color);
    border-bottom: 1px solid #eaeaea;
    flex-wrap: wrap;
    gap: 15px;
}

.control-panel h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    flex-grow: 1;
    text-align: center;
}

/* 按钮样式 */
.btn-primary, .btn-secondary, .btn-warning, .btn-success, .btn-icon {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
    transform: translateY(-2px);
}

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

.btn-warning:hover {
    background: #e1156d;
    transform: translateY(-2px);
}

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

.btn-success:hover {
    background: #3ab0d6;
    transform: translateY(-2px);
}

.btn-icon {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* 日历样式 */
.calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
    padding: 30px;
    background: white;
}

.weekday {
    text-align: center;
    font-weight: 600;
    color: var(--gray-color);
    padding: 15px 5px;
    background: var(--light-color);
    border-radius: 8px;
    font-size: 1.1rem;
}

.day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    position: relative;
    user-select: none;
    border: 2px solid transparent;
}

.day:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.day .date-num {
    font-size: 1.5em;
    margin-bottom: 5px;
    font-weight: 700;
}

.day .status-text {
    font-size: 0.8em;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 日期状态样式 */
.day.normal {
    background: linear-gradient(135deg, #e9ecef, #dee2e6);
    color: #495057;
}

.day.half {
    background: linear-gradient(135deg, #ffd166, #ffb347);
    color: #7a4c00;
}

.day.full {
    background: linear-gradient(135deg, #ef476f, #ff6b6b);
    color: white;
}

.day.other-month {
    background: #f8f9fa;
    color: #adb5bd;
    cursor: default;
}

.day.other-month:hover {
    transform: none;
    box-shadow: none;
    border-color: transparent;
}

/* 统计面板 */
.stats-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    background: var(--light-color);
    padding: 30px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

@media (max-width: 768px) {
    .stats-panel {
        grid-template-columns: 1fr;
    }
}

.stat-box, .legend {
    background: white;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.stat-box h3, .legend h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eaeaea;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 8px 0;
    border-bottom: 1px dashed #eee;
}

.stat-label {
    color: var(--gray-color);
}

.stat-value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.hint {
    font-size: 0.9em;
    color: #adb5bd;
    font-style: italic;
    margin-top: 15px;
}

.legend-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    gap: 15px;
}

.day-box {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    border: 2px solid rgba(255, 255, 255, 0.7);
}

.day-box.normal { background: linear-gradient(135deg, #e9ecef, #dee2e6); }
.day-box.half { background: linear-gradient(135deg, #ffd166, #ffb347); }
.day-box.full { background: linear-gradient(135deg, #ef476f, #ff6b6b); }

.legend-text {
    font-weight: 500;
}

/* 页脚 */
footer {
    background: var(--dark-color);
    color: white;
    padding: 25px 30px;
    margin-top: 30px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sync-status {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    color: #adb5bd;
}

#sync-status {
    color: #4cc9f0;
    font-weight: 500;
}

#last-sync {
    font-size: 0.85rem;
    color: #6c757d;
}

.footer-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.footer-note {
    font-size: 0.9rem;
    color: #adb5bd;
    line-height: 1.5;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    width: 90%;
    max-width: 450px;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.close-modal {
    font-size: 28px;
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    transform: scale(1.2);
}

.modal-body {
    padding: 30px;
}

.auth-tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 25px;
    background: #f8f9fa;
    padding: 5px;
    border-radius: 8px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: none;
    cursor: pointer;
    font-weight: 600;
    border-radius: 6px;
    transition: var(--transition);
}

.tab-btn.active {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group input {
    width: 100%;
    padding: 14px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-hint {
    display: block;
    margin-top: 5px;
    font-size: 0.85rem;
    color: var(--gray-color);
}

.auth-message {
    margin-top: 20px;
    padding: 12px;
    border-radius: 6px;
    font-size: 0.95rem;
    display: none;
}

.auth-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.auth-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .control-panel {
        padding: 15px;
    }
    
    .control-panel h2 {
        font-size: 1.5rem;
    }
    
    .calendar {
        padding: 15px;
        gap: 8px;
    }
    
    .day .date-num {
        font-size: 1.2em;
    }
    
    .day .status-text {
        font-size: 0.7em;
    }
    
    .stats-panel {
        padding: 20px;
    }
    
    .stat-box, .legend {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .header-top {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .user-info {
        width: 100%;
        justify-content: center;
    }
    
    .control-panel {
        flex-direction: column;
        gap: 10px;
    }
    
    .control-panel h2 {
        order: -1;
    }
    
    .btn-primary, .btn-secondary, .btn-warning, .btn-success, .btn-icon {
        width: 100%;
        justify-content: center;
    }
}