/* =============================================
   RESET
   ============================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* =============================================
   VARIABLES — colores, tipografía, espaciado
   Separadas por modo claro y oscuro para
   facilitar el mantenimiento
   ============================================= */
:root {
    /* Safe areas iOS (notch, home bar) */
    --safe-top:    env(safe-area-inset-top,    0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);

    /* Colores semánticos de calidad */
    --c-green:  #86efac;
    --c-purple: #c4b5fd;
    --c-amber:  #fcd34d;
    --c-red:    #f87171;

    /* Tipografías */
    --font-ui:      'Sora', sans-serif;
    --font-display: 'DM Serif Display', serif;

    /* Radio de borde unificado */
    --radius-card:   22px;
    --radius-inner:  14px;
    --radius-pill:   100px;

    /* Transición estándar */
    --transition: 0.22s ease;
}

/* MODO OSCURO (por defecto, porque la app es nocturna) */
:root {
    --bg-base:      #0a0e1a;
    --bg-card:      rgba(255, 255, 255, 0.055);
    --bg-inset:     rgba(0, 0, 0, 0.28);
    --bg-btn-act:   rgba(110, 70, 210, 0.35);
    --bg-result:    rgba(0, 0, 0, 0.22);
    --bg-best:      rgba(110, 70, 210, 0.18);

    --border-card:  rgba(255, 255, 255, 0.10);
    --border-inset: rgba(255, 255, 255, 0.07);
    --border-btn:   rgba(130, 80, 255, 0.45);
    --border-best:  rgba(130, 80, 255, 0.40);
    --border-sci:   rgba(130, 80, 255, 0.45);

    --text-primary:   #e8e4f0;
    --text-secondary: rgba(232, 228, 240, 0.45);
    --text-muted:     rgba(232, 228, 240, 0.28);
    --text-accent:    #c4b5fd;
    --text-time:      #e8e4f0;

    --glow-logo:    rgba(130, 70, 255, 0.50);
    --glow-best:    rgba(110, 70, 210, 0.22);
    --glow-time:    rgba(130, 80, 255, 0.25);

    --badge-bg:     linear-gradient(135deg, #a78bfa, #7c3aed);
    --badge-text:   #ffffff;
}

/* MODO CLARO — override de variables */
@media (prefers-color-scheme: light) {
    :root {
        --bg-base:      #f0eef8;
        --bg-card:      rgba(255, 255, 255, 0.55);
        --bg-inset:     rgba(0, 0, 0, 0.06);
        --bg-btn-act:   rgba(110, 70, 210, 0.12);
        --bg-result:    rgba(255, 255, 255, 0.50);
        --bg-best:      rgba(110, 70, 210, 0.10);

        --border-card:  rgba(0, 0, 0, 0.08);
        --border-inset: rgba(0, 0, 0, 0.06);
        --border-btn:   rgba(110, 70, 210, 0.50);
        --border-best:  rgba(110, 70, 210, 0.40);
        --border-sci:   rgba(110, 70, 210, 0.40);

        --text-primary:   #1a1525;
        --text-secondary: rgba(26, 21, 37, 0.50);
        --text-muted:     rgba(26, 21, 37, 0.32);
        --text-accent:    #6d28d9;
        --text-time:      #1a1525;

        --glow-logo:    rgba(110, 70, 210, 0.25);
        --glow-best:    rgba(110, 70, 210, 0.10);
        --glow-time:    transparent;

        --badge-bg:     linear-gradient(135deg, #7c3aed, #5b21b6);
        --badge-text:   #ffffff;
    }
}

/* =============================================
   BASE — body y fondo
   ============================================= */
body {
    font-family: var(--font-ui);
    font-weight: 400;
    background: var(--bg-base);
    color: var(--text-primary);
    min-height: 100svh;
    /* Padding que respeta el notch y la home bar de iOS */
    padding: calc(var(--safe-top) + 1.5rem) 1.25rem calc(var(--safe-bottom) + 2rem);
    overflow-x: hidden;
}

/* Gradientes decorativos de fondo — solo en modo oscuro */
.bg-glow {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse 90% 55% at 15% -5%,  rgba(100, 60, 200, 0.16) 0%, transparent 65%),
        radial-gradient(ellipse 70% 45% at 88% 8%,   rgba(60, 100, 255, 0.10) 0%, transparent 55%),
        radial-gradient(ellipse 55% 40% at 50% 105%,  rgba(140, 60, 220, 0.09) 0%, transparent 60%);
    /* Ocultar en modo claro — el fondo ya tiene su propio color */
    display: block;
}

@media (prefers-color-scheme: light) {
    .bg-glow  { display: none; }
    .bg-stars { display: none; }
}

/* Partículas de estrellas — solo modo oscuro */
.bg-stars {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        radial-gradient(1.5px 1.5px at 12% 18%,  rgba(255,255,255,0.35) 0%, transparent 100%),
        radial-gradient(1px   1px   at 68% 12%,   rgba(255,255,255,0.22) 0%, transparent 100%),
        radial-gradient(1px   1px   at 38% 72%,   rgba(255,255,255,0.18) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 83% 58%,   rgba(255,255,255,0.28) 0%, transparent 100%),
        radial-gradient(1px   1px   at 22% 88%,   rgba(255,255,255,0.18) 0%, transparent 100%),
        radial-gradient(1px   1px   at 57% 38%,   rgba(255,255,255,0.14) 0%, transparent 100%),
        radial-gradient(1px   1px   at 91% 82%,   rgba(255,255,255,0.20) 0%, transparent 100%);
}

/* =============================================
   CONTENEDOR PRINCIPAL
   ============================================= */
.wrap {
    position: relative;
    z-index: 1;
    max-width: 420px;
    margin: 0 auto;
}

/* =============================================
   GLASSMORPHISM — clase reutilizable
   backdrop-filter: el efecto de vidrio esmerilado
   saturate: intensifica los colores del fondo
   ============================================= */
.glass {
    background: var(--bg-card);
    backdrop-filter: blur(24px) saturate(1.6);
    -webkit-backdrop-filter: blur(24px) saturate(1.6);
    border: 0.5px solid var(--border-card);
    border-radius: var(--radius-card);
}

/* =============================================
   CABECERA
   ============================================= */
header {
    text-align: center;
    margin-bottom: 1.75rem;
    padding-top: 0.5rem;
}

/* Logo principal */
.logo {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    display: block;
    margin: 0 auto 1.1rem;
    object-fit: contain;
    filter: drop-shadow(0 0 20px var(--glow-logo));
}

/* Fallback si los PNGs no están subidos aún */
.logo-fallback {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    margin: 0 auto 1.1rem;
    background: rgba(110, 70, 210, 0.18);
    border: 0.5px solid rgba(130, 80, 255, 0.30);
    filter: drop-shadow(0 0 16px var(--glow-logo));
}

/* Título principal — sin cursiva, tipografía display seria */
h1 {
    font-family: var(--font-display);
    font-size: 1.95rem;
    font-weight: 400;
    font-style: normal; /* explícito: sin cursiva */
    letter-spacing: -0.01em;
    color: var(--text-primary);
    line-height: 1.1;
}

.subtitle {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 0.45rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* =============================================
   TARJETA PRINCIPAL
   ============================================= */
.card {
    padding: 1.4rem;
    margin-bottom: 0.75rem;
}

/* --- Toggle modo (despertar / acostarse) --- */
.toggle {
    display: flex;
    background: var(--bg-inset);
    border: 0.5px solid var(--border-inset);
    border-radius: var(--radius-inner);
    padding: 3px;
    gap: 3px;
    margin-bottom: 1.4rem;
}

.toggle-btn {
    flex: 1;
    padding: 9px 6px;
    font-family: var(--font-ui);
    font-size: 0.73rem;
    font-weight: 400;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: calc(var(--radius-inner) - 3px);
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.35;
    text-align: center;
}

.toggle-btn.active {
    background: var(--bg-btn-act);
    border: 0.5px solid var(--border-btn);
    color: var(--text-primary);
    font-weight: 500;
}

/* --- Bloque de hora --- */
.time-block {
    text-align: center;
    margin-bottom: 1.4rem;
}

/* Etiqueta de campo — reutilizada en varios sitios */
.field-label {
    display: block;
    font-size: 0.68rem;
    color: var(--text-secondary);
    letter-spacing: 0.10em;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}

/* Input de hora — grande y prominente */
input[type="time"] {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 400;
    color: var(--text-time);
    background: transparent;
    border: none;
    outline: none;
    text-align: center;
    width: 100%;
    cursor: pointer;
    -webkit-appearance: none;
    text-shadow: 0 0 28px var(--glow-time);
}

/* Ocultar el icono nativo del picker en WebKit */
input[type="time"]::-webkit-calendar-picker-indicator { display: none; }
input[type="time"]::-webkit-datetime-edit { padding: 0; }

/* --- Selector de latencia --- */
.delay-section { /* sin margen extra, el card ya tiene padding */ }

.delay-btns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    margin-top: 0.75rem;
}

.delay-btn {
    padding: 10px 4px;
    font-family: var(--font-ui);
    font-size: 0.73rem;
    font-weight: 400;
    color: var(--text-secondary);
    background: var(--bg-inset);
    border: 0.5px solid var(--border-inset);
    border-radius: var(--radius-inner);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    line-height: 1.35;
}

.delay-btn small {
    font-size: 0.60rem;
    opacity: 0.6;
    display: block;
}

.delay-btn.active {
    background: var(--bg-btn-act);
    border-color: var(--border-btn);
    color: var(--text-accent);
    font-weight: 500;
}

.delay-note {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 0.65rem;
    text-align: center;
    line-height: 1.5;
}

/* =============================================
   TARJETA DE RESULTADOS
   ============================================= */
.results-card {
    padding: 1.25rem;
    margin-bottom: 0.75rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 0.85rem;
}

.result-item {
    background: var(--bg-result);
    border: 0.5px solid var(--border-inset);
    border-radius: var(--radius-inner);
    padding: 13px 5px;
    text-align: center;
    position: relative; /* para el badge absoluto */
    transition: all var(--transition);
}

/* Opción recomendada — resaltada */
.result-item.best {
    background: var(--bg-best);
    border-color: var(--border-best);
    box-shadow: 0 0 22px var(--glow-best), inset 0 0.5px 0 rgba(255,255,255,0.12);
}

/* Badge "ideal" flotante sobre la tarjeta */
.best-badge {
    position: absolute;
    top: -9px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--badge-bg);
    color: var(--badge-text);
    font-size: 0.56rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 2px 9px;
    border-radius: var(--radius-pill);
    white-space: nowrap;
}

.result-time {
    font-family: var(--font-display);
    font-size: 1.22rem;
    color: var(--text-primary);
    display: block;
    margin-bottom: 4px;
}

.result-item.best .result-time {
    color: var(--text-accent);
    text-shadow: 0 0 16px var(--glow-time);
}

.result-cycles,
.result-hours {
    font-size: 0.63rem;
    color: var(--text-secondary);
    display: block;
}

.result-quality {
    font-size: 0.58rem;
    font-weight: 500;
    display: block;
    margin-top: 4px;
    /* color inyectado por JS según calidad */
}

/* =============================================
   TARJETA CIENTÍFICA — explicación dinámica
   ============================================= */
.science-card {
    padding: 1rem 1.2rem;
    margin-bottom: 0.75rem;
    /* Borde izquierdo como acento visual */
    border-left: 2px solid var(--border-sci) !important;
    border-radius: var(--radius-inner) !important;
}

.science-card p {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.70;
}

.science-card strong {
    color: var(--text-accent);
    font-weight: 500;
}

/* =============================================
   PIE DE PÁGINA
   ============================================= */
footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.63rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    line-height: 1.9;
}

footer em {
    font-style: normal;
    color: var(--text-secondary);
}

/* =============================================
   RESPONSIVE — pantallas muy pequeñas
   ============================================= */
@media (max-width: 340px) {
    input[type="time"]  { font-size: 2.9rem; }
    .result-time        { font-size: 1.05rem; }
    .results-grid       { gap: 5px; }
}