/* Theme Variables */
:root {
    --bg-color: #f8f9fa;
    --container-bg: #ffffff;
    --text-color: #2c3e50;
    --input-bg: #ffffff;
    --input-border: #ddd;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --button-disabled: #bdc3c7;
    --work-color: #e74c3c;
    --rest-color: #2ecc71;
    --section-bg: #f5f5f5;
    --shadow-color: rgba(0,0,0,0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --input-bg: #3d3d3d;
    --input-border: #4d4d4d;
    --button-bg: #2980b9;
    --button-hover: #3498db;
    --button-disabled: #505050;
    --work-color: #ff6b6b;
    --rest-color: #51cf66;
    --section-bg: #363636;
    --shadow-color: rgba(0,0,0,0.3);
}

/* Global Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    text-align: center;
    background-color: var(--bg-color);
    color: var(--text-color);
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Container Styles */
.container {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow-color);
}

h1 {
    color: var(--text-color);
    margin-bottom: 2rem;
    font-size: 2.5rem;
}

/* Configuration Section */
.config {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--section-bg);
    border-radius: 8px;
}

.config div {
    text-align: left;
}

/* Timer Display */
.timer {
    font-size: 6rem;
    font-weight: bold;
    margin: 2rem 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Courier New', monospace;
    color: var(--text-color);
    line-height: 1;
}

.phase {
    font-size: 1.5rem;
    margin: 1rem 0;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.work {
    color: var(--work-color);
}

.rest {
    color: var(--rest-color);
}

.progress {
    margin: 1rem 0;
    font-size: 1.2rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Control Buttons */
.controls button,
.round-controls button {
    font-size: 1.2rem;
    padding: 0.75rem 1.5rem;
    margin: 0.5rem;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg);
    color: white;
    transition: background-color 0.3s ease;
    touch-action: manipulation;
}

.controls button:hover:not(:disabled),
.round-controls button:hover:not(:disabled) {
    background-color: var(--button-hover);
}

.controls button:disabled,
.round-controls button:disabled {
    background-color: var(--button-disabled);
    cursor: not-allowed;
    opacity: 0.7;
}

/* Round Controls */
.round-controls button {
    background-color: var(--rest-color);
}

.round-controls button:hover:not(:disabled) {
    background-color: var(--rest-color);
    opacity: 0.9;
}

/* Sound Controls Section */
.sound-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
    padding: 1.5rem;
    background: var(--section-bg);
    border-radius: 8px;
}

/* Form Elements */
label {
    font-weight: bold;
    color: var(--text-color);
    display: block;
    margin-bottom: 0.5rem;
}

input, select {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.25rem;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
}

/* Number Input */
input[type="number"] {
    -webkit-appearance: none;
    -moz-appearance: textfield;
    appearance: none;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    margin: 0;
}

/* Range Input */
.volume-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

.volume-control input[type="range"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    height: 5px;
    background: var(--input-border);
    border-radius: 5px;
    width: 100%;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--button-bg);
    border-radius: 50%;
    cursor: pointer;
}

.volume-control input[type="range"]::-moz-range-thumb {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--button-bg);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.volume-control input[type="range"]::-ms-thumb {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--button-bg);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Select Element */
select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.7em top 50%;
    background-size: 1em auto;
    padding-right: 2.5em;
}

/* Checkbox */
.mute-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
}

input[type="checkbox"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--button-bg);
    border-radius: 4px;
    background-color: var(--input-bg);
    cursor: pointer;
    position: relative;
}

input[type="checkbox"]:checked {
    background-color: var(--button-bg);
}

input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 4px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Focus States */
input:focus,
select:focus,
button:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--container-bg), 0 0 0 4px var(--button-bg);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
}

.theme-toggle button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    background-color: var(--container-bg);
    box-shadow: 0 2px 5px var(--shadow-color);
}

.theme-toggle button:hover {
    background-color: var(--section-bg);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="light"] .moon-icon {
    display: block;
}

/* Responsive Design */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .timer {
        font-size: 4rem;
    }

    .controls button,
    .round-controls button {
        font-size: 1rem;
        padding: 0.5rem 1rem;
        width: calc(50% - 1rem);
        margin: 0.25rem;
    }

    .sound-controls {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2rem;
    }

    .config {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }
}

/* Print Styles */
@media print {
    .container {
        box-shadow: none;
    }

    .controls,
    .sound-controls,
    .theme-toggle {
        display: none;
    }
}