:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --muted-color: #94a3b8;
    --accent-color: #0d9488;
    --work-color: #10b981;
    --rest-color: #f59e0b;
    --countdown-color: #ef4444;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    display: flex;
    flex-direction: column;
}

header {
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    flex-shrink: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.back-btn {
    color: var(--muted-color);
    text-decoration: none;
    font-size: 1.1rem;
    transition: color 0.2s;
}

.timer-exercise-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    border-bottom: 1px dashed transparent;
    transition: all 0.2s;
}

.timer-exercise-name:hover {
    border-bottom-color: var(--accent-color);
}

.edit-name-input {
    background: rgba(0,0,0,0.3);
    border: none;
    color: var(--accent-color);
    font-size: 1.1rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    border-bottom: 2px solid var(--accent-color);
    outline: none;
    text-transform: uppercase;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--muted-color);
    cursor: pointer;
    font-size: 1.4rem;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.icon-btn:hover {
    color: var(--text-color);
    transform: scale(1.1);
}

.main-wrapper {
    display: flex;
    flex: 1;
    min-height: 0;
    width: 100%;
    position: relative;
}

/* Sidebar / Sequence Nav */
.pose-nav {
    width: 240px;
    background: rgba(0, 0, 0, 0.2);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    padding: 16px;
    overflow-y: auto;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.exercise-item {
    padding: 12px;
    border-radius: 12px;
    margin-bottom: 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

.exercise-item.active {
    background: rgba(13, 148, 136, 0.1);
    border-color: rgba(13, 148, 136, 0.3);
}

.exercise-item.completed {
    opacity: 0.4;
}

.exercise-item .name {
    font-weight: 600;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 4px;
}

.exercise-item .meta {
    font-size: 0.75rem;
    color: var(--muted-color);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    position: relative;
}

.timer-container {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1/1;
    position: relative;
    cursor: pointer;
}

.timer-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-bg-circle {
    fill: none;
    stroke: rgba(255, 255, 255, 0.05);
    stroke-width: 4;
}

.timer-progress-circle {
    fill: none;
    stroke: var(--accent-color);
    stroke-width: 4;
    stroke-dasharray: 283; /* 2 * PI * 45 */
    stroke-dashoffset: 283;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.1s linear, stroke 0.3s ease;
}

.timer-text {
    fill: var(--text-color);
    font-size: 24px;
    font-weight: 800;
    transform: rotate(90deg);
    transform-origin: center;
}

.timer-subtext {
    fill: var(--muted-color);
    font-size: 6px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transform: rotate(90deg);
    transform-origin: center;
}

.timer-info {
    text-align: center;
    margin-top: 24px;
}

.timer-phase {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--accent-color);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.timer-hint {
    color: var(--muted-color);
    font-size: 1.1rem;
}

/* Settings Panel (Debug Panel Style) */
.debug-panel {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 340px;
    background: #0f172a;
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    padding: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.debug-panel.active {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.settings-header h3 {
    margin: 0;
    font-size: 1.2rem;
}

.workout-config-list {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 24px;
}

.config-row {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    position: relative;
}

.config-row .remove-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    color: var(--countdown-color);
}

.config-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 8px;
}

.config-item label {
    display: block;
    font-size: 0.7rem;
    color: var(--muted-color);
    margin-bottom: 4px;
    text-transform: uppercase;
}

.config-item input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.btn-add {
    background: rgba(255, 255, 255, 0.05);
    color: var(--muted-color);
    border: 1px dashed rgba(255, 255, 255, 0.2);
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    width: 100%;
    margin-bottom: 24px;
}

.btn-add:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 12px;
    font-weight: 700;
    width: 100%;
    cursor: pointer;
}

/* Modals & Stats (Same as Breathe App) */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-color);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 32px;
    width: 90%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: var(--muted-color);
    cursor: pointer;
    font-size: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
}

.stat-box {
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 16px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--muted-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .pose-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: auto;
        max-height: 140px;
        flex-direction: row;
        border-right: none;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        z-index: 50;
    }
    
    .exercise-item {
        min-width: 120px;
        margin-bottom: 0;
        margin-right: 8px;
    }
    
    .debug-panel {
        width: 100%;
    }
    
    main {
        padding-bottom: 160px;
    }
}

/* Audio Notice */
.audio-notice {
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    z-index: 100;
    cursor: pointer;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}