:root {
    --primary-color: #3498db;
    --exercise-color: #3498db;
    --rest-color: #f39c12;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-gray: #ecf0f1;
    --dark-gray: #7f8c8d;
    --text-color: #2c3e50;
}

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

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100dvh;
    margin: 0;
    padding: 10px;
    overflow-y: auto;
    touch-action: manipulation;
}

.container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 15px;
    width: 100%;
    max-width: 350px;
    text-align: center;
    margin-top: 10px;
    box-sizing: border-box;
}

h1 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.8rem;
}

/* Timer Display Section */
.timer-container {
    position: relative;
    width: 100%;
    max-width: 200px;
    height: 200px;
    margin: 0 auto 20px;
}

.progress-ring {
    position: relative;
    width: 100%;
    height: 100%;
}

.progress-ring__circle {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
}

.progress-ring__circle-bg {
    stroke: var(--light-gray);
    stroke-width: 8;
    fill: transparent;
}

.progress-ring__circle-fg {
    stroke: var(--exercise-color);
    stroke-width: 8;
    stroke-linecap: round;
    fill: transparent;
    transition: stroke-dashoffset 0.5s;
}

.timer-display {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    pointer-events: none;
    z-index: 10;
}

.time {
    font-size: 3rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 5px;
}

.reps {
    font-size: 1.2rem;
    color: var(--dark-gray);
}

/* Settings Section */
.settings {
    margin-bottom: 15px;
    text-align: left;
}

.settings h2 {
    color: var(--text-color);
    font-size: 1.3rem;
    margin-bottom: 15px;
    text-align: center;
}

.setting-group {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    justify-content: space-between;
}

.setting-label {
    font-weight: bold;
    color: var(--text-color);
    width: 60px;
    font-size: 1rem;
}

.setting-value {
    font-size: 1rem;
    width: 45px;
    text-align: center;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 5px;
    margin: 0 8px;
    -webkit-appearance: none;
}

/* Remove spinner arrows */
.setting-value::-webkit-outer-spin-button,
.setting-value::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.setting-value {
    -moz-appearance: textfield;
}

.setting-value:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* Sound Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--dark-gray);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* Control Buttons */
.control-buttons {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    flex-wrap: wrap;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    padding: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background-color 0.3s;
    flex: 1;
    min-height: 44px;
}

button:hover {
    background-color: #2980b9;
}

.btn-start {
    background-color: var(--success-color);
}

.btn-start:hover {
    background-color: #27ae60;
}

.btn-reset {
    background-color: var(--danger-color);
}

.btn-reset:hover {
    background-color: #c0392b;
}

.btn-install {
    background-color: var(--warning-color);
    flex: 0 0 100%;
    margin-top: 8px;
}

.btn-install:hover {
    background-color: #e67e22;
}

.btn-increment, .btn-decrement {
    width: 30px;
    height: 30px;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: auto;
}

/* PWA Install Prompt */
.install-prompt {
    background-color: var(--light-gray);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    text-align: center;
}

.install-prompt p {
    margin-bottom: 10px;
    color: var(--text-color);
    font-size: 0.9rem;
}

.install-prompt button {
    margin: 0 5px;
    padding: 8px 15px;
    flex: none;
    min-height: auto;
}

/* Animation for timer */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 1s infinite;
}

/* PWA specific styles */
@media (display-mode: standalone) {
    body {
        -webkit-user-select: none;
        -webkit-touch-callout: none;
        -webkit-tap-highlight-color: transparent;
    }
    
    .container {
        margin-top: 20px;
    }
    
    /* Hide install prompts when in standalone mode */
    .install-prompt,
    .btn-install {
        display: none !important;
    }
}

/* iOS specific PWA styles */
@supports (-webkit-touch-callout: none) {
    @media (display-mode: standalone) {
        body {
            padding-top: env(safe-area-inset-top);
            padding-bottom: env(safe-area-inset-bottom);
        }
    }
}

/* Media Queries */
@media (max-width: 350px) {
    .timer-container {
        max-width: 180px;
        height: 180px;
    }
    
    .time {
        font-size: 2.2rem;
    }
    
    .reps {
        font-size: 1rem;
    }
    
    .progress-ring__circle-bg,
    .progress-ring__circle-fg {
        stroke-width: 7;
    }
    
    .setting-group {
        margin-bottom: 10px;
    }
    
    button {
        font-size: 0.8rem;
        padding: 6px;
    }
}

@media (max-height: 600px) {
    .container {
        padding: 10px;
    }
    .time {
        font-size: 2.2rem;
    }
    .reps {
        font-size: 1rem;
    }
    button {
        padding: 6px;
        font-size: 0.85rem;
    }
    .settings {
        margin-bottom: 10px;
    }
}

/* Prevent zooming on input focus */
@media (max-width: 480px) {
    input, select, textarea {
        font-size: 16px;
    }
}

/* Fallback for browsers without aspect-ratio support */
@supports not (aspect-ratio: 1/1) {
    .progress-ring::before {
        content: "";
        display: block;
        padding-top: 100%;
    }
    
    .progress-ring {
        height: 0;
        overflow: hidden;
        position: relative;
    }
    
    .progress-ring__circle {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}

/* Hide audio elements */
audio { 
    display: none;
}