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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    min-height: 100vh;
    padding: 20px;
}

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

/* 头部 */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 5px;
}

.subtitle {
    color: #888;
    font-size: 0.9rem;
}

/* 统计面板 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.stat-card {
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 15px 10px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.1);
}

.stat-card.total {
    background: rgba(255,107,107,0.15);
    border-color: rgba(255,107,107,0.3);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-card.total .stat-value {
    color: #ff6b6b;
}

.stat-label {
    font-size: 0.75rem;
    color: #888;
    margin-bottom: 3px;
}

.stat-growth {
    font-size: 0.7rem;
    color: #4ade80;
}

.stat-growth.negative {
    color: #f87171;
}

/* 大按钮 */
.main-action {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.din-button {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(145deg, #ff6b6b, #ee5a5a);
    box-shadow: 0 10px 40px rgba(255,107,107,0.4),
                inset 0 -5px 20px rgba(0,0,0,0.2),
                inset 0 5px 20px rgba(255,255,255,0.2);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.din-button:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 50px rgba(255,107,107,0.5),
                inset 0 -5px 20px rgba(0,0,0,0.2),
                inset 0 5px 20px rgba(255,255,255,0.2);
}

.din-button:active {
    transform: scale(0.95);
    box-shadow: 0 5px 20px rgba(255,107,107,0.3),
                inset 0 -3px 10px rgba(0,0,0,0.2),
                inset 0 3px 10px rgba(255,255,255,0.2);
}

.din-button.recording {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 10px 40px rgba(255,107,107,0.4); }
    50% { box-shadow: 0 10px 60px rgba(255,107,107,0.7); }
}

.btn-text {
    font-size: 3rem;
    line-height: 1;
}

.btn-label {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 输入区域 */
.input-section {
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
    border: 1px solid rgba(255,255,255,0.1);
}

.input-section.hidden {
    display: none;
}

#din-content {
    width: 100%;
    padding: 15px;
    font-size: 1rem;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    background: rgba(0,0,0,0.2);
    color: #fff;
    margin-bottom: 15px;
    outline: none;
    transition: border-color 0.2s;
}

#din-content:focus {
    border-color: #ff6b6b;
}

#din-content::placeholder {
    color: #666;
}

.input-actions {
    display: flex;
    gap: 10px;
}

.btn-primary, .btn-secondary {
    flex: 1;
    padding: 12px 20px;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: #ff6b6b;
    color: #fff;
}

.btn-primary:hover {
    background: #ff5252;
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: #aaa;
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

/* 最近记录 */
.recent {
    margin-bottom: 30px;
}

.recent h2, .achievements h2 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: #aaa;
}

.recent-list {
    background: rgba(255,255,255,0.03);
    border-radius: 12px;
    overflow: hidden;
}

.recent-item {
    display: flex;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    gap: 15px;
}

.recent-item:last-child {
    border-bottom: none;
}

.recent-time {
    font-size: 0.75rem;
    color: #666;
    white-space: nowrap;
    min-width: 60px;
}

.recent-content {
    flex: 1;
    color: #ddd;
    word-break: break-all;
}

.recent-content.empty {
    color: #666;
    font-style: italic;
}

.recent-actions {
    display: flex;
    gap: 5px;
}

.recent-actions button {
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 5px;
    font-size: 1rem;
    transition: color 0.2s;
}

.recent-actions button:hover {
    color: #ff6b6b;
}

.empty {
    padding: 30px;
    text-align: center;
    color: #666;
}

/* 成就 */
.achievement-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.achievement-item {
    background: rgba(255,255,255,0.03);
    border-radius: 12px;
    padding: 15px 10px;
    text-align: center;
    border: 2px solid transparent;
    transition: all 0.2s;
    opacity: 0.5;
}

.achievement-item.unlocked {
    background: rgba(255,215,0,0.1);
    border-color: rgba(255,215,0,0.3);
    opacity: 1;
}

.achievement-icon {
    font-size: 2rem;
    margin-bottom: 5px;
}

.achievement-name {
    font-size: 0.75rem;
    color: #aaa;
    margin-bottom: 3px;
}

.achievement-desc {
    font-size: 0.6rem;
    color: #666;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(74,222,128,0.9);
    color: #000;
    padding: 15px 30px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

/* 响应式 */
@media (max-width: 500px) {
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .achievement-list {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .achievement-name {
        font-size: 0.65rem;
    }
    
    .din-button {
        width: 150px;
        height: 150px;
    }
    
    .btn-text {
        font-size: 2.5rem;
    }
}