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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 520px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 24px;
    font-size: 2em;
}

.settings {
    margin-bottom: 24px;
}

.input-group {
    margin-bottom: 18px;
}

.input-row {
    display: flex;
    gap: 12px;
}

.input-row .input-group {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 600;
    font-size: 0.95em;
}

input[type="number"],
select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    background: #fff;
    transition: border-color 0.3s;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

input:disabled,
select:disabled {
    background: #f3f3f3;
    color: #999;
    cursor: not-allowed;
}

.program-description {
    font-size: 0.9em;
    color: #777;
    margin: -8px 0 18px;
    min-height: 1.2em;
    line-height: 1.4;
}

/* Level segmented control */
.level-control {
    display: flex;
    gap: 8px;
}

.level-control button {
    flex: 1;
    min-width: 0;
    padding: 10px;
    font-size: 14px;
    border: 2px solid #ddd;
    background: #fff;
    color: #555;
    border-radius: 8px;
    cursor: pointer;
    text-transform: none;
    transition: all 0.2s;
}

.level-control button.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: transparent;
    color: #fff;
}

/* Custom timing inputs, shown only for the Custom program */
.custom-only {
    display: none;
}

body.custom-mode .custom-only {
    display: block;
}

/* Voice / audio options */
.options {
    border-top: 1px solid #eee;
    padding-top: 18px;
    margin-bottom: 24px;
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.toggle-row label {
    margin-bottom: 0;
}

.switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: #ccc;
    border-radius: 28px;
    transition: 0.3s;
}

.slider::before {
    content: "";
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: 0.3s;
}

.switch input:checked + .slider {
    background: #667eea;
}

.switch input:checked + .slider::before {
    transform: translateX(24px);
}

.voice-settings {
    margin-top: 6px;
}

.voice-settings.hidden {
    display: none;
}

.range-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.range-row label {
    margin-bottom: 0;
    width: 60px;
    flex-shrink: 0;
}

.range-row input[type="range"] {
    flex: 1;
}

/* Breathing visualizer */
.breathing-circle {
    width: 220px;
    height: 220px;
    margin: 24px auto;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: scale(1);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

/* Phase colors */
.breathing-circle.phase-inhale {
    background: linear-gradient(135deg, #43cea2 0%, #185a9d 100%);
}

.breathing-circle.phase-exhale {
    background: linear-gradient(135deg, #ff9966 0%, #ff5e62 100%);
}

.breathing-circle.phase-retain,
.breathing-circle.phase-sustain {
    background: linear-gradient(135deg, #c471f5 0%, #fa71cd 100%);
}

.breathing-circle.phase-prep {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.circle-inner {
    text-align: center;
    color: #fff;
}

.instruction {
    font-size: 1.6em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.circle-count {
    font-size: 2.6em;
    font-weight: bold;
    margin-top: 4px;
}

.progress {
    text-align: center;
    font-size: 1.2em;
    color: #666;
    margin-bottom: 20px;
}

.completion-message {
    text-align: center;
    font-size: 1.5em;
    color: #27ae60;
    margin: 20px 0;
    font-weight: 600;
    display: none;
}

.completion-message.show {
    display: block;
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.controls {
    display: flex;
    gap: 15px;
    justify-content: center;
}

button {
    padding: 15px 30px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
    text-transform: uppercase;
}

.start-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-width: 160px;
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.reset-btn {
    background: #fff;
    color: #667eea;
    border: 2px solid #667eea;
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.25);
}

.aum-row {
    display: flex;
    justify-content: center;
    margin-top: 14px;
}

.aum-btn {
    background: #fff;
    color: #764ba2;
    border: 2px solid #d9cdec;
    border-radius: 999px;
    padding: 10px 24px;
    font-size: 15px;
    text-transform: none;
    min-width: 160px;
}

.aum-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.2);
}

.aum-btn.playing {
    background: linear-gradient(135deg, #c471f5 0%, #fa71cd 100%);
    color: #fff;
    border-color: transparent;
}

.hint {
    text-align: center;
    font-size: 0.8em;
    color: #999;
    margin-top: 14px;
}

.donate {
    text-align: center;
    font-size: 0.62em;
    margin-top: 4px;
}

.donate a {
    color: #999;
    text-decoration: none;
}

.donate a:hover {
    text-decoration: underline;
}

/* Phones: tighten spacing and let the controls share the row. */
@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .container {
        padding: 22px;
        border-radius: 16px;
    }

    h1 {
        font-size: 1.6em;
        margin-bottom: 18px;
    }

    .breathing-circle {
        width: 180px;
        height: 180px;
        margin: 18px auto;
    }

    .controls {
        gap: 10px;
    }

    .controls button {
        flex: 1;
        min-width: 0;
        padding: 14px 12px;
    }
}

/* Respect users who prefer reduced motion. */
@media (prefers-reduced-motion: reduce) {
    .start-btn:hover,
    .reset-btn:hover {
        transform: none;
    }
}