/* Estilos Generales */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    color: #333;
}

.hidden {
    display: none !important;
}

.screen {
    padding: 20px;
    max-width: 450px;
    margin: 0 auto;
    text-align: center;
}

/* Header */
header h1 {
    color: #4285F4;
    margin-bottom: 5px;
}

.greeting {
    color: #666;
    margin-top: 0;
}

/* Grid de Métricas */
.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 25px 0;
}

.metric {
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.value {
    font-size: 28px;
    font-weight: bold;
    display: block;
    color: #4285F4;
}

.label {
    font-size: 12px;
    color: #666;
    text-transform: uppercase;
}

/* Botones Principales */
.big-button {
    background: #4285F4;
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 18px;
    cursor: pointer;
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    box-shadow: 0 3px 6px rgba(66, 133, 244, 0.2);
}

/* Cuenta Regresiva */
.countdown {
    font-size: 72px;
    font-weight: bold;
    color: #4285F4;
    margin: 30px 0;
}

/* Controles de Tracking */
.tracking-controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.tracking-controls button {
    padding: 12px 20px;
    border-radius: 30px;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Menú Inferior */
footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    box-shadow: 0 -2px 5px rgba(0,0,0,0.1);
}

.tab {
    background: none;
    border: none;
    padding: 5px 10px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 12px;
    color: #666;
}

.tab.active {
    color: #4285F4;
}

.tab i {
    font-size: 24px;
    margin-bottom: 5px;
}
/* Tema Claro (default) */
:root {
    --bg-color: #f5f5f5;
    --text-color: #333;
    --card-bg: white;
    --primary-color: #4285F4;
    --secondary-color: #34A853;
    --footer-bg: white;
}

/* Tema Oscuro */
[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #fff;
    --card-bg: #1e1e1e;
    --primary-color: #34A853;
    --secondary-color: #4285F4;
    --footer-bg: #1a1a1a;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
}

.metric {
    background: var(--card-bg);
}

.big-button, .tracking-controls button {
    background: var(--primary-color);
}

footer {
    background: var(--footer-bg);
}

/* Botón de toggle */
.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
}