:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #00ff88;
    --accent-hover: #00e67a;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --secondary: #334155;
    --secondary-hover: #475569;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.timer-card {
    background-color: var(--card-bg);
    border-radius: 24px;
    padding: 40px 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

h1 {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent);
}

.settings {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 600;
}

.time-inputs {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="number"] {
    background: var(--bg-color);
    border: 1px solid var(--secondary);
    color: var(--text-main);
    padding: 12px;
    border-radius: 12px;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    width: 100%;
    text-align: center;
    outline: none;
    transition: all 0.3s ease;
}

input[type="number"]:focus,
.custom-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(0, 255, 136, 0.2);
}

.custom-select {
    background: var(--bg-color);
    border: 1px solid var(--secondary);
    color: var(--text-main);
    padding: 12px;
    border-radius: 12px;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    width: 100%;
    outline: none;
    transition: all 0.3s ease;
    cursor: pointer;
    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='%2394a3b8' 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 12px center;
    background-size: 16px;
}

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

.display {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
}

.progress-ring__circle {
    stroke-dasharray: 565.48;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear;
}

.time-left {
    font-size: 48px;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.controls {
    display: flex;
    gap: 10px;
    width: 100%;
}

.btn {
    flex: 1;
    padding: 14px 0;
    border: none;
    border-radius: 12px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.icon-btn {
    flex: 0 0 auto;
    padding: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
}

.primary {
    background-color: var(--accent);
    color: var(--bg-color);
}

.primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.secondary {
    background-color: var(--secondary);
}

.secondary:hover:not(:disabled) {
    background-color: var(--secondary-hover);
    transform: translateY(-2px);
}

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

.danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
    transform: translateY(-2px);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.time-left.ending {
    color: var(--danger);
    animation: pulse 1s infinite;
}