/* Variables CSS para colores y estilos globales */
:root {
    --color-primario: #1e40af;
    --color-primario-oscuro: #1e3a8a;
    --color-secundario: #ec4899;
    --color-exito: #10b981;
    --color-advertencia: #f59e0b;
    --color-peligro: #ef4444;
    --color-fondo: #000000;
    --color-fondo-secundario: #1a1a3e;
    --color-fondo-tarjeta: #252550;
    --color-texto-primario: #ffffff;
    --color-texto-secundario: #93c5fd;
    --color-texto-apagado: #6b7280;
    --color-borde: #374151;
    --sombra: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --sombra-grande: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Variables para tema claro */
.light-theme {
    --color-fondo: #f8fafc;
    --color-fondo-secundario: #e2e8f0;
    --color-fondo-tarjeta: #ffffff;
    --color-texto-primario: #1a202c;
    --color-texto-secundario: #4a5568;
    --color-texto-apagado: #718096;
    --color-borde: #e2e8f0;
    --sombra: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --sombra-grande: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

/* Reseteo de estilos básicos */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Estilos del cuerpo principal */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, var(--color-fondo) 0%, var(--color-fondo-secundario) 100%);
    color: var(--color-texto-primario);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Contenedor principal */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === ESTILOS DEL ENCABEZADO === */
.header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-borde);
    gap: 2rem;
}

/* Logo y título */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 2rem;
    color: var(--color-primario);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--color-primario), var(--color-secundario));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navegación entre modos */
.nav {
    display: flex;
    gap: 8px;
    background: var(--color-fondo-tarjeta);
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--color-borde);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--color-texto-secundario);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Efecto de hover brillante para botones de navegación */
.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s;
}

.nav-btn:hover::before {
    left: 100%;
}

.nav-btn:hover {
    color: var(--color-texto-primario);
    transform: translateY(-2px);
}

/* Botón de navegación activo */
.nav-btn.active {
    background: linear-gradient(45deg, var(--color-primario), var(--color-primario-oscuro));
    color: white;
    box-shadow: var(--sombra);
}

/* === CONTENIDO PRINCIPAL === */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 0;
    gap: 3rem;
}

/* === SECCIÓN DEL TEMPORIZADOR === */
.timer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

/* Círculo del temporizador */
.timer-circle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Anillo de progreso SVG */
.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-bg {
    fill: none;
    stroke: var(--color-fondo);
    stroke-width: 8;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--color-primario);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 879.6;
    stroke-dashoffset: 879.6;
    transition: stroke-dashoffset 1s linear;
}

/* Display del tiempo dentro del círculo */
.timer-display {
    position: absolute;
    text-align: center;
}

.time {
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-texto-primario);
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
}

.mode-label {
    font-size: 1.1rem;
    color: var(--color-texto-secundario);
    font-weight: 500;
}

/* === CONTROLES DEL TEMPORIZADOR === */
.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Estilos base para botones */
.btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Efecto de onda al hacer clic */
.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

/* Botón primario */
.btn-primary {
    background: linear-gradient(45deg, var(--color-primario), var(--color-primario-oscuro));
    color: white;
    box-shadow: var(--sombra);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--sombra-grande);
}

/* Botón secundario */
.btn-secondary {
    background: var(--color-fondo-tarjeta);
    color: var(--color-texto-secundario);
    border: 1px solid var(--color-borde);
}

.btn-secondary:hover {
    background: var(--color-borde);
    color: var(--color-texto-primario);
    transform: translateY(-2px);
}

/* Botón de peligro */
.btn-danger {
    background: #dc3545;
    color: white;
    border: 1px solid #dc3545;
}

.btn-danger:hover {
    background: #c82333;
    border-color: #bd2130;
    transform: translateY(-2px);
}

/* === SECCIÓN DE ESTADÍSTICAS === */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 800px;
}

/* Tarjetas de estadísticas */
.stats-card {
    background: var(--color-fondo-tarjeta);
    border: 1px solid var(--color-borde);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s ease;
}

.stats-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra);
    border-color: var(--color-primario);
}

/* Iconos de estadísticas */
.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: linear-gradient(45deg, var(--color-primario), var(--color-secundario));
    color: white;
}

/* Números de estadísticas */
.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-texto-primario);
}

/* Etiquetas de estadísticas */
.stat-label {
    font-size: 0.9rem;
    color: var(--color-texto-secundario);
    margin-top: 4px;
}

/* === SECCIÓN DE CONFIGURACIÓN === */
.settings-container {
    width: 100%;
    max-width: 500px;
}

/* Botón para mostrar/ocultar configuración */
.settings-btn {
    width: 100%;
    background: var(--color-fondo-tarjeta);
    border: 1px solid var(--color-borde);
    border-radius: 12px;
    padding: 16px 24px;
    color: var(--color-texto-secundario);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.settings-btn:hover {
    background: var(--color-borde);
    color: var(--color-texto-primario);
}

/* Panel de configuración */
.settings-panel {
    background: var(--color-fondo-tarjeta);
    border: 1px solid var(--color-borde);
    border-radius: 12px;
    padding: 2rem;
    margin-top: 1rem;
    display: none;
    animation: deslizarAbajo 0.3s ease;
}

.settings-panel.active {
    display: block;
}

.settings-panel h3 {
    margin-bottom: 1.5rem;
    color: var(--color-texto-primario);
}

/* Grupos de configuración */
.setting-group {
    margin-bottom: 1.5rem;
}

.setting-group label {
    display: block;
    color: var(--color-texto-secundario);
    margin-bottom: 8px;
    font-weight: 500;
}

/* Deslizadores de rango */
.setting-group input[type="range"] {
    width: 100%;
    margin: 8px 0;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: var(--color-fondo-secundario);
    border-radius: 4px;
    outline: none;
}

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

/* Checkboxes */
.setting-group input[type="checkbox"] {
    margin-right: 8px;
    accent-color: var(--color-primario);
}

/* === NOTIFICACIÓN === */
.notification {
    position: fixed;
    top: -100px;
    right: 20px;
    background: linear-gradient(45deg, var(--color-exito), #059669);
    color: white;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: var(--sombra-grande);
    transition: all 0.3s ease;
    z-index: 1000;
}

.notification.show {
    top: 20px;
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}

/* === PIE DE PÁGINA === */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--color-texto-apagado);
    border-top: 1px solid var(--color-borde);
}

/* === ANIMACIONES === */
@keyframes deslizarAbajo {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.pulse {
    animation: pulso 2s infinite;
}

/* === DISEÑO RESPONSIVO === */
@media (max-width: 768px) {
    .header {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .theme-toggle-container {
        order: 1;
        justify-content: center;
    }
    
    .nav {
        order: 2;
        flex-direction: column;
        width: 100%;
    }
    
    .time {
        font-size: 3rem;
    }
    
    .controls {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        justify-content: center;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .theme-switch {
        --toggle-size: 18px;
    }
}

/* Fondo decorativo con gradiente sutil */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 80%, rgba(30, 64, 175, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Fondo para tema claro */
.light-theme::before {
    background: radial-gradient(circle at 20% 80%, rgba(30, 64, 175, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
}

/* Ajustes adicionales para tema claro */
.light-theme .progress-ring-fill {
    stroke: var(--color-primario);
}

.light-theme .progress-ring-bg {
    stroke: var(--color-fondo);
}

.light-theme .timer-circle::before {
    opacity: 0;
    background: transparent;
}

/* Efecto de fondo para el círculo del temporizador */
.timer-circle::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent;
    border-radius: 50%;
    z-index: -1;
    opacity: 0;
}

/* === SWITCH DE TEMA DÍA/NOCHE === */
.theme-toggle-container {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

/* From Uiverse.io by Galahhad */ 
.theme-switch {
    --toggle-size: 20px;
    /* the size is adjusted using font-size,
       this is not transform scale,
       so you can choose any size */
    --container-width: 5.625em;
    --container-height: 2.5em;
    --container-radius: 6.25em;
    /* radius 0 - minecraft mode :) */
    --container-light-bg: #3D7EAE;
    --container-night-bg: #1D1F2C;
    --circle-container-diameter: 3.375em;
    --sun-moon-diameter: 2.125em;
    --sun-bg: #ECCA2F;
    --moon-bg: #C4C9D1;
    --spot-color: #959DB1;
    --circle-container-offset: calc((var(--circle-container-diameter) - var(--container-height)) / 2 * -1);
    --stars-color: #fff;
    --clouds-color: #F3FDFF;
    --back-clouds-color: #AACADF;
    --transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
    --circle-transition: .3s cubic-bezier(0, -0.02, 0.35, 1.17);
}

.theme-switch, .theme-switch *, .theme-switch *::before, .theme-switch *::after {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-size: var(--toggle-size);
}

.theme-switch__container {
    width: var(--container-width);
    height: var(--container-height);
    background-color: var(--container-light-bg);
    border-radius: var(--container-radius);
    overflow: hidden;
    cursor: pointer;
    -webkit-box-shadow: 0em -0.062em 0.062em rgba(0, 0, 0, 0.25), 0em 0.062em 0.125em rgba(255, 255, 255, 0.94);
    box-shadow: 0em -0.062em 0.062em rgba(0, 0, 0, 0.25), 0em 0.062em 0.125em rgba(255, 255, 255, 0.94);
    -webkit-transition: var(--transition);
    -o-transition: var(--transition);
    transition: var(--transition);
    position: relative;
}

.theme-switch__container::before {
    content: "";
    position: absolute;
    z-index: 1;
    inset: 0;
    -webkit-box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset, 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset;
    box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset, 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset;
    border-radius: var(--container-radius)
}

.theme-switch__checkbox {
    display: none;
}

.theme-switch__circle-container {
    width: var(--circle-container-diameter);
    height: var(--circle-container-diameter);
    background-color: rgba(255, 255, 255, 0.1);
    position: absolute;
    left: var(--circle-container-offset);
    top: var(--circle-container-offset);
    border-radius: var(--container-radius);
    -webkit-box-shadow: inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), 0 0 0 0.625em rgba(255, 255, 255, 0.1), 0 0 0 1.25em rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), 0 0 0 0.625em rgba(255, 255, 255, 0.1), 0 0 0 1.25em rgba(255, 255, 255, 0.1);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-transition: var(--circle-transition);
    -o-transition: var(--circle-transition);
    transition: var(--circle-transition);
    pointer-events: none;
}

.theme-switch__sun-moon-container {
    pointer-events: auto;
    position: relative;
    z-index: 2;
    width: var(--sun-moon-diameter);
    height: var(--sun-moon-diameter);
    margin: auto;
    border-radius: var(--container-radius);
    background-color: var(--sun-bg);
    -webkit-box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #a1872a inset;
    box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #a1872a inset;
    -webkit-filter: drop-shadow(0.062em 0.125em 0.125em rgba(0, 0, 0, 0.25)) drop-shadow(0em 0.062em 0.125em rgba(0, 0, 0, 0.25));
    filter: drop-shadow(0.062em 0.125em 0.125em rgba(0, 0, 0, 0.25)) drop-shadow(0em 0.062em 0.125em rgba(0, 0, 0, 0.25));
    overflow: hidden;
    -webkit-transition: var(--transition);
    -o-transition: var(--transition);
    transition: var(--transition);
}

.theme-switch__moon {
    -webkit-transform: translateX(100%);
    -ms-transform: translateX(100%);
    transform: translateX(100%);
    width: 100%;
    height: 100%;
    background-color: var(--moon-bg);
    border-radius: inherit;
    -webkit-box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #969696 inset;
    box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #969696 inset;
    -webkit-transition: var(--transition);
    -o-transition: var(--transition);
    transition: var(--transition);
    position: relative;
}

.theme-switch__spot {
    position: absolute;
    top: 0.75em;
    left: 0.312em;
    width: 0.75em;
    height: 0.75em;
    border-radius: var(--container-radius);
    background-color: var(--spot-color);
    -webkit-box-shadow: 0em 0.0312em 0.062em rgba(0, 0, 0, 0.25) inset;
    box-shadow: 0em 0.0312em 0.062em rgba(0, 0, 0, 0.25) inset;
}

.theme-switch__spot:nth-of-type(2) {
    width: 0.375em;
    height: 0.375em;
    top: 0.937em;
    left: 1.375em;
}

.theme-switch__spot:nth-last-of-type(3) {
    width: 0.25em;
    height: 0.25em;
    top: 0.312em;
    left: 0.812em;
}

.theme-switch__clouds {
    width: 1.25em;
    height: 1.25em;
    background-color: var(--clouds-color);
    border-radius: var(--container-radius);
    position: absolute;
    bottom: -0.625em;
    left: 0.312em;
    -webkit-box-shadow: 0.937em 0.312em var(--clouds-color), -0.312em -0.312em var(--back-clouds-color), 1.437em 0.375em var(--clouds-color), 0.5em -0.125em var(--back-clouds-color), 2.187em 0 var(--clouds-color), 1.25em -0.062em var(--back-clouds-color), 2.937em 0.312em var(--clouds-color), 2em -0.312em var(--back-clouds-color), 3.625em -0.062em var(--clouds-color), 2.625em 0em var(--back-clouds-color), 4.5em -0.312em var(--clouds-color), 3.375em -0.437em var(--back-clouds-color), 4.625em -1.75em 0 0.437em var(--clouds-color), 4em -0.625em var(--back-clouds-color), 4.125em -2.125em 0 0.437em var(--back-clouds-color);
    box-shadow: 0.937em 0.312em var(--clouds-color), -0.312em -0.312em var(--back-clouds-color), 1.437em 0.375em var(--clouds-color), 0.5em -0.125em var(--back-clouds-color), 2.187em 0 var(--clouds-color), 1.25em -0.062em var(--back-clouds-color), 2.937em 0.312em var(--clouds-color), 2em -0.312em var(--back-clouds-color), 3.625em -0.062em var(--clouds-color), 2.625em 0em var(--back-clouds-color), 4.5em -0.312em var(--clouds-color), 3.375em -0.437em var(--back-clouds-color), 4.625em -1.75em 0 0.437em var(--clouds-color), 4em -0.625em var(--back-clouds-color), 4.125em -2.125em 0 0.437em var(--back-clouds-color);
    -webkit-transition: 0.5s cubic-bezier(0, -0.02, 0.4, 1.25);
    -o-transition: 0.5s cubic-bezier(0, -0.02, 0.4, 1.25);
    transition: 0.5s cubic-bezier(0, -0.02, 0.4, 1.25);
}

.theme-switch__stars-container {
    position: absolute;
    color: var(--stars-color);
    top: -100%;
    left: 0.312em;
    width: 2.75em;
    height: auto;
    -webkit-transition: var(--transition);
    -o-transition: var(--transition);
    transition: var(--transition);
}

/* Animaciones del switch de tema */
.theme-switch__checkbox:checked + .theme-switch__container {
    background-color: var(--container-night-bg);
}

.theme-switch__checkbox:checked + .theme-switch__container .theme-switch__circle-container {
    left: calc(100% - var(--circle-container-offset) - var(--circle-container-diameter));
}

.theme-switch__checkbox:checked + .theme-switch__container .theme-switch__circle-container:hover {
    left: calc(100% - var(--circle-container-offset) - var(--circle-container-diameter) - 0.187em)
}

.theme-switch__circle-container:hover {
    left: calc(var(--circle-container-offset) + 0.187em);
}

.theme-switch__checkbox:checked + .theme-switch__container .theme-switch__moon {
    -webkit-transform: translate(0);
    -ms-transform: translate(0);
    transform: translate(0);
}

.theme-switch__checkbox:checked + .theme-switch__container .theme-switch__clouds {
    bottom: -4.062em;
}

.theme-switch__checkbox:checked + .theme-switch__container .theme-switch__stars-container {
    top: 50%;
    -webkit-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
}