* {
    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;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* 页面标题样式 */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
}

.title {
    font-family: 'Playfair Display', serif;
    font-size: 4rem;
    font-weight: 700;
    color: #ffffff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 300;
}

/* 用户交互区域样式 */
.input-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    align-items: end;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-weight: 600;
    color: #374151;
    margin-bottom: 8px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #ffffff;
}

.input-group input:focus {
    outline: none;
    border-color: #3B82F6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-group input[type="color"] {
    height: 50px;
    padding: 8px;
    cursor: pointer;
}

.generate-btn {
    background: linear-gradient(135deg, #3B82F6, #1D4ED8);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.download-btn {
    background: linear-gradient(135deg, #10B981, #059669);
    color: white;
    border: none;
    padding: 16px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.25);
}

.download-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(16,185,129,0.35); }
.download-btn:active { transform: translateY(0); }

.toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    background: rgba(17, 24, 39, 0.95);
    color: #fff;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 0.95rem;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    z-index: 2000;
    max-width: 90vw;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.generate-btn:active {
    transform: translateY(0);
}

/* 统计信息样式 */
.stats-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 24px;
    margin-bottom: 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-radius: 16px;
    border: 1px solid #e2e8f0;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* 生命时间圆圈样式 */
.weeks-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.weeks-actions {
    margin-top: 16px;
    display: flex;
    justify-content: center;
}

.weeks-container {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.year-row {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 4px 0;
}

.year-label {
    font-weight: 600;
    color: #374151;
    min-width: 60px;
    text-align: center;
    font-size: 0.9rem;
}

.year-spacer {
    min-width: 60px;
}

.week-circle {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.week-circle.past {
    background-color: var(--past-color, #3B82F6);
    border: 2px solid var(--past-color, #3B82F6);
}

.week-circle.future {
    background-color: transparent;
    border: 2px solid #d1d5db;
}

.week-circle.before-birth {
    background-color: transparent;
    border: 2px dashed #9ca3af;
}

.week-circle:hover {
    transform: scale(1.3);
    z-index: 10;
}

/* 每10年的分隔 */
.year-row:nth-child(10n) {
    margin-bottom: 12px;
}

/* 周信息提示框样式 */
.week-tooltip {
    position: absolute;
    z-index: 1000;
    pointer-events: none;
    animation: tooltipFadeIn 0.3s ease-out;
}

.tooltip-content {
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    line-height: 1.4;
    white-space: nowrap;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
}

.tooltip-title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 6px;
    color: #ffffff;
}

.tooltip-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.85rem;
    color: #e5e7eb;
}

.tooltip-status {
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 4px;
    text-align: center;
    font-size: 0.8rem;
}

.tooltip-status.past {
    background-color: var(--past-color, #3B82F6);
    color: white;
}

.tooltip-status.future {
    background-color: #6b7280;
    color: white;
}

.tooltip-status.before-birth {
    background-color: #9ca3af;
    color: white;
}

/* 提示框出现动画 */
@keyframes tooltipFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }
    
    .input-section {
        grid-template-columns: 1fr;
        padding: 20px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .week-circle {
        width: 10px;
        height: 10px;
    }
    
    .year-row {
        gap: 6px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 12px;
    }
    
    .title { font-size: 1.75rem; }
    .subtitle { font-size: 0.95rem; }
    
    .week-circle {
        width: 8px;
        height: 8px;
    }
    
    .year-row {
        gap: 4px;
    }
}

/* Accessibility helpers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}