/* Breath Holding Tool Styles */
#bht-container {
    --primary: #5BC0BE;
    --primary-light: #8DE2E1;
    --secondary: #9B6B9E;
    --accent: #6AAB95;
    --background: #F8FCFD;
    --card-bg: #FFFFFF;
    --text: #2E3A59;
    --text-light: #8C9AB1;
    --shadow: 0 10px 30px rgba(91, 192, 190, 0.15);
    --neumorphic-shadow: 8px 8px 16px #d9d9d9, -8px -8px 16px #ffffff;
    --border-radius: 20px;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text);
}

#bht-container *, #bht-container *::before, #bht-container *::after {
    box-sizing: border-box;
}

#bht-container .container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    #bht-container .container {
        grid-template-columns: 2fr 1fr;
    }
}

#bht-container .card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

#bht-container .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(91, 192, 190, 0.2);
}

#bht-container header {
    text-align: center;
    margin-bottom: 20px;
}

#bht-container h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#bht-container .subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 30px;
    line-height: 1.6;
}

#bht-container .timer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 30px 0;
}

#bht-container .timer-circle {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--neumorphic-shadow);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

#bht-container .timer-circle.active {
    animation: bht-pulse 2s infinite alternate;
}

@keyframes bht-pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.03); }
}

#bht-container .timer-display {
    font-size: 3.5rem;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 10px;
}

#bht-container .timer-status {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

#bht-container .lungs-icon {
    position: absolute;
    bottom: 20px;
    opacity: 0.7;
    font-size: 2.5rem;
    color: white;
}

#bht-container .controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin: 30px 0;
    flex-wrap: wrap;
}

#bht-container .btn {
    padding: 14px 32px;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#bht-container .btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}

#bht-container .btn-secondary {
    background: linear-gradient(135deg, #FF9A8B, #FF6A88);
    color: white;
}

#bht-container .btn-outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--primary-light);
}

#bht-container .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px rgba(0, 0, 0, 0.15);
}

#bht-container .btn:active {
    transform: translateY(1px);
}

#bht-container .zones {
    display: flex;
    justify-content: space-between;
    margin: 30px 0;
    flex-wrap: wrap;
    gap: 15px;
}

#bht-container .zone {
    flex: 1;
    min-width: 150px;
    padding: 15px;
    border-radius: var(--border-radius);
    text-align: center;
    color: white;
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#bht-container .zone-1 {
    background: linear-gradient(135deg, #FFD166, #FFB347);
}

#bht-container .zone-2 {
    background: linear-gradient(135deg, #06D6A0, #1B9AAA);
}

#bht-container .zone-3 {
    background: linear-gradient(135deg, #118AB2, #073B4C);
}

#bht-container .breathing-indicators {
    display: flex;
    justify-content: space-between;
    margin: 30px 0;
    padding: 0 20px;
}

#bht-container .lung-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

#bht-container .lung-icon {
    font-size: 2rem;
    color: var(--primary);
    transition: all 0.5s ease;
}

#bht-container .lung-icon.active {
    color: var(--secondary);
    transform: scale(1.2);
}

#bht-container .history-section {
    margin-top: 20px;
}

#bht-container .history-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#bht-container table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

#bht-container th, #bht-container td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

#bht-container th {
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.9rem;
}

#bht-container .zone-badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
}

#bht-container .zone-badge.yellow {
    background: linear-gradient(135deg, #FFD166, #FFB347);
}

#bht-container .zone-badge.green {
    background: linear-gradient(135deg, #06D6A0, #1B9AAA);
}

#bht-container .zone-badge.blue {
    background: linear-gradient(135deg, #118AB2, #073B4C);
}

#bht-container footer {
    text-align: center;
    margin-top: 40px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #bht-container .timer-circle {
        width: 220px;
        height: 220px;
    }
    
    #bht-container .timer-display {
        font-size: 2.8rem;
    }
    
    #bht-container .zones {
        flex-direction: column;
    }
    
    #bht-container .btn {
        padding: 12px 24px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    #bht-container .container {
        padding: 10px;
    }
    
    #bht-container .card {
        padding: 20px;
    }
    
    #bht-container h1 {
        font-size: 1.8rem;
    }
    
    #bht-container .subtitle {
        font-size: 1rem;
    }
    
    #bht-container .timer-circle {
        width: 200px;
        height: 200px;
    }
    
    #bht-container .timer-display {
        font-size: 2.5rem;
    }
}