/* ============================================================
   GENERADOR DE CONTRASEÑAS — Estilos principales
   Base: 1rem = 10px  (html { font-size: 10px })
   Paleta: azules y tonos fríos
   Autor: Antigravity – Experto Web 12 años
   ============================================================ */

/* ====== Custom Properties (tokens de diseño) ====== */
:root {
    /* Fondo */
    --color-bg:          #060b18;
    --color-bg-card:     rgba(10, 20, 45, 0.75);
    --color-bg-input:    rgba(4, 9, 22, 0.85);
    --color-bg-option:   rgba(255, 255, 255, 0.02);

    /* Azules */
    --color-blue-400:    #60a5fa;
    --color-blue-500:    #3b82f6;
    --color-blue-600:    #2563eb;
    --color-blue-700:    #1d4ed8;

    /* Cian */
    --color-cyan-300:    #67e8f9;
    --color-cyan-400:    #22d3ee;
    --color-cyan-500:    #06b6d4;

    /* Texto */
    --color-text-primary:   #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted:     #4b5c7a;

    /* Bordes */
    --color-border:       rgba(96, 165, 250, 0.15);
    --color-border-hover: rgba(96, 165, 250, 0.4);
    --color-border-focus: rgba(59, 130, 246, 0.7);

    /* Fortaleza */
    --color-weak:        #f87171;
    --color-fair:        #fb923c;
    --color-good:        #facc15;
    --color-strong:      #4ade80;
    --color-very-strong: #22d3ee;

    /* Gradientes */
    --gradient-brand:    linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --gradient-bg:       radial-gradient(ellipse at 30% 10%, #0d1f4a 0%, #060b18 65%);
    --gradient-card:     linear-gradient(135deg,
                             rgba(37, 99, 235, 0.08) 0%,
                             rgba(6, 182, 212, 0.04) 100%);

    /* Espaciado */
    --sp-xs:   0.6rem;
    --sp-sm:   1.0rem;
    --sp-md:   1.6rem;
    --sp-lg:   2.4rem;
    --sp-xl:   3.2rem;
    --sp-xxl:  4.8rem;

    /* Tipografía */
    --fs-xs:   1.1rem;
    --fs-sm:   1.3rem;
    --fs-base: 1.6rem;
    --fs-lg:   1.8rem;
    --fs-xl:   2.4rem;
    --fs-2xl:  3.2rem;

    /* Radios */
    --r-sm:  0.6rem;
    --r-md:  1.2rem;
    --r-lg:  1.8rem;
    --r-xl:  2.4rem;
    --r-full: 9999rem;

    /* Sombras */
    --shadow-sm:   0 0.2rem 0.8rem rgba(0, 0, 0, 0.35);
    --shadow-md:   0 0.8rem 2.4rem rgba(0, 0, 0, 0.45);
    --shadow-lg:   0 2rem 5rem rgba(0, 0, 0, 0.55);
    --shadow-glow: 0 0 2.5rem rgba(37, 99, 235, 0.25);

    /* Transiciones */
    --t-fast:   150ms ease;
    --t-normal: 250ms ease;
    --t-slow:   400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 10px; /* Base: 1rem = 10px */
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: var(--fs-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--gradient-bg);
    background-color: var(--color-bg);
    background-attachment: fixed;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Orbes de fondo animados */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(8rem);
}

body::before {
    width: 60rem;
    height: 60rem;
    top: -15rem;
    left: -15rem;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.12), transparent 70%);
    animation: orbFloat 10s ease-in-out infinite alternate;
}

body::after {
    width: 50rem;
    height: 50rem;
    bottom: -10rem;
    right: -10rem;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.09), transparent 70%);
    animation: orbFloat 13s ease-in-out infinite alternate-reverse;
}

@keyframes orbFloat {
    0%   { transform: translate(0, 0) scale(1); }
    100% { transform: translate(3rem, 3rem) scale(1.08); }
}

/* ====== Header ====== */
.header {
    position: relative;
    z-index: 1;
    padding: var(--sp-xl) var(--sp-md) var(--sp-lg);
    text-align: center;
}

.header__container {
    max-width: 60rem;
    margin: 0 auto;
}

.header__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-sm);
    margin-bottom: var(--sp-xs);
}

.header__icon {
    width: 3.6rem;
    height: 3.6rem;
    color: var(--color-cyan-400);
    filter: drop-shadow(0 0 1rem rgba(34, 211, 238, 0.6));
    flex-shrink: 0;
}

.header__title {
    font-size: var(--fs-2xl);
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05rem;
    line-height: 1.2;
}

.header__subtitle {
    font-size: var(--fs-sm);
    color: var(--color-text-secondary);
    letter-spacing: 0.03rem;
}

/* ====== Main ====== */
.main {
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: var(--sp-sm) var(--sp-md) var(--sp-xxl);
}

/* ====== Card ====== */
.card {
    width: 100%;
    max-width: 54rem;
    background: var(--color-bg-card);
    background-image: var(--gradient-card);
    backdrop-filter: blur(2.4rem);
    -webkit-backdrop-filter: blur(2.4rem);
    border: 0.1rem solid var(--color-border);
    border-radius: var(--r-xl);
    padding: var(--sp-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow),
                inset 0 0.1rem 0 rgba(255, 255, 255, 0.06);
    display: flex;
    flex-direction: column;
    gap: var(--sp-lg);
}

/* ====== Password Display ====== */
.password-display {
    display: flex;
    flex-direction: column;
    gap: var(--sp-xs);
}

.password-field {
    display: flex;
    align-items: center;
    gap: var(--sp-xs);
    background: var(--color-bg-input);
    border: 0.15rem solid var(--color-border);
    border-radius: var(--r-md);
    padding: var(--sp-sm) var(--sp-md);
    transition: border-color var(--t-normal), box-shadow var(--t-normal);
}

.password-field:focus-within {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 0.35rem rgba(37, 99, 235, 0.12);
}

.password-field--flash {
    animation: fieldFlash 0.55s ease-out forwards;
}

@keyframes fieldFlash {
    0%   { box-shadow: 0 0 0 0.35rem rgba(6, 182, 212, 0.05); border-color: var(--color-border); }
    40%  { box-shadow: 0 0 0 0.5rem  rgba(6, 182, 212, 0.35), 0 0 3rem rgba(6, 182, 212, 0.2); border-color: var(--color-cyan-400); }
    100% { box-shadow: 0 0 0 0.35rem rgba(37, 99, 235, 0.12); border-color: var(--color-border-focus); }
}

.password-field__input {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-cyan-300);
    font-size: var(--fs-lg);
    font-family: 'Courier New', 'Cascadia Code', 'Monaco', monospace;
    font-weight: 600;
    letter-spacing: 0.12rem;
    word-break: break-all;
}

.password-field__input::placeholder {
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    font-family: 'Segoe UI', system-ui, sans-serif;
    font-weight: 400;
    letter-spacing: 0;
}

.password-field__actions {
    display: flex;
    gap: var(--sp-xs);
    flex-shrink: 0;
}

/* ====== Botones icono ====== */
.btn-icon {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.8rem;
    height: 3.8rem;
    background: rgba(59, 130, 246, 0.08);
    border: 0.1rem solid var(--color-border);
    border-radius: var(--r-sm);
    color: var(--color-blue-400);
    cursor: pointer;
    transition: all var(--t-fast);
    overflow: hidden;
}

.btn-icon::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-brand);
    opacity: 0;
    transition: opacity var(--t-fast);
}

.btn-icon:hover {
    color: #fff;
    border-color: var(--color-blue-400);
    transform: translateY(-0.15rem);
    box-shadow: 0 0.4rem 1.5rem rgba(37, 99, 235, 0.35);
}

.btn-icon:hover::before {
    opacity: 0.18;
}

.btn-icon:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn-icon:focus-visible {
    outline: 0.2rem solid var(--color-blue-400);
    outline-offset: 0.2rem;
}

.icon {
    position: relative;
    z-index: 1;
    width: 1.8rem;
    height: 1.8rem;
    transition: transform var(--t-fast);
}

.btn-icon:hover .icon {
    transform: scale(1.15);
}

/* ====== Feedback de copia ====== */
.copy-feedback {
    min-height: 1.8rem;
    font-size: var(--fs-xs);
    color: var(--color-cyan-400);
    text-align: center;
    opacity: 0;
    transform: translateY(-0.4rem);
    transition: opacity var(--t-normal), transform var(--t-normal);
    pointer-events: none;
}

.copy-feedback--visible {
    opacity: 1;
    transform: translateY(0);
}

/* ====== Indicador de fortaleza ====== */
.strength {
    display: flex;
    flex-direction: column;
    gap: var(--sp-xs);
}

.strength__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.strength__label {
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12rem;
}

.strength__text {
    font-size: var(--fs-sm);
    font-weight: 700;
    color: var(--color-text-muted);
    transition: color var(--t-slow);
    min-width: 8rem;
    text-align: right;
}

.strength__bar {
    width: 100%;
    height: 0.7rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--r-full);
    overflow: hidden;
    border: 0.1rem solid rgba(255, 255, 255, 0.06);
}

.strength__fill {
    height: 100%;
    width: 0;
    border-radius: var(--r-full);
    background: var(--gradient-brand);
    transition: width var(--t-slow), background-color var(--t-slow), background var(--t-slow);
}

/* — Estados de fortaleza — */
.strength--weak       .strength__fill { width: 20%; background: var(--color-weak); }
.strength--fair       .strength__fill { width: 40%; background: var(--color-fair); }
.strength--good       .strength__fill { width: 60%; background: var(--color-good); }
.strength--strong     .strength__fill { width: 80%; background: var(--color-strong); }
.strength--very-strong .strength__fill { width: 100%; background: var(--gradient-brand); }

.strength--weak        .strength__text { color: var(--color-weak); }
.strength--fair        .strength__text { color: var(--color-fair); }
.strength--good        .strength__text { color: var(--color-good); }
.strength--strong      .strength__text { color: var(--color-strong); }
.strength--very-strong .strength__text { color: var(--color-cyan-400); }

/* ====== Controles (formulario) ====== */
.controls {
    display: flex;
    flex-direction: column;
    gap: var(--sp-lg);
}

/* — Grupo slider — */
.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--sp-sm);
}

.control-group__header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--sp-sm);
}

.control-group__label {
    font-size: var(--fs-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    cursor: default;
}

.control-group__value {
    font-size: var(--fs-xl);
    font-weight: 800;
    color: var(--color-cyan-400);
    font-variant-numeric: tabular-nums;
    min-width: 3.5rem;
    text-align: right;
    transition: transform var(--t-fast), color var(--t-fast);
    display: inline-block;
    line-height: 1;
}

.control-group__value.pop {
    animation: valuePop 0.2s ease-out;
}

@keyframes valuePop {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.25); color: var(--color-cyan-300); }
    100% { transform: scale(1); }
}

/* — Slider — */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 0.6rem;
    border-radius: var(--r-full);
    background:
        linear-gradient(
            to right,
            var(--color-blue-500) 0%,
            var(--color-blue-500) var(--slider-pct, 10%),
            rgba(255, 255, 255, 0.07) var(--slider-pct, 10%),
            rgba(255, 255, 255, 0.07) 100%
        );
    outline: none;
    cursor: pointer;
}

.slider:focus-visible {
    outline: 0.2rem solid var(--color-blue-400);
    outline-offset: 0.3rem;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 0 0 0.3rem var(--color-blue-600),
                0 0 1.5rem rgba(37, 99, 235, 0.6);
    cursor: grab;
    transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.slider::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.25);
    box-shadow: 0 0 0 0.4rem var(--color-blue-500),
                0 0 2.5rem rgba(37, 99, 235, 0.8);
}

.slider::-moz-range-thumb {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    border: none;
    background: #fff;
    box-shadow: 0 0 0 0.3rem var(--color-blue-600),
                0 0 1.5rem rgba(37, 99, 235, 0.6);
    cursor: grab;
    transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.slider::-moz-range-thumb:active {
    cursor: grabbing;
    transform: scale(1.25);
}

.slider__labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    padding: 0 0.2rem;
    user-select: none;
}

/* — Opciones (toggles) — */
.options {
    border: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--sp-sm);
}

.options__legend {
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12rem;
    margin-bottom: var(--sp-sm);
    display: block;
}

.option {
    display: flex;
}

.option__label {
    display: flex;
    align-items: center;
    gap: var(--sp-md);
    width: 100%;
    padding: var(--sp-sm) var(--sp-md);
    background: var(--color-bg-option);
    border: 0.1rem solid var(--color-border);
    border-radius: var(--r-md);
    cursor: pointer;
    user-select: none;
    transition: background var(--t-normal), border-color var(--t-normal), transform var(--t-fast);
}

.option__label:hover {
    background: rgba(59, 130, 246, 0.06);
    border-color: var(--color-border-hover);
    transform: translateX(0.2rem);
}

/* Ocultar checkbox nativo */
.option__checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* Toggle switch personalizado */
.option__toggle {
    position: relative;
    flex-shrink: 0;
    width: 4.6rem;
    height: 2.6rem;
    background: rgba(255, 255, 255, 0.07);
    border: 0.1rem solid var(--color-border);
    border-radius: var(--r-full);
    transition: background var(--t-normal), border-color var(--t-normal), box-shadow var(--t-normal);
}

.option__toggle::after {
    content: '';
    position: absolute;
    top: 0.4rem;
    left: 0.4rem;
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 50%;
    background: var(--color-text-muted);
    transition: transform var(--t-normal), background var(--t-normal);
}

.option__checkbox:checked + .option__toggle {
    background: var(--color-blue-600);
    border-color: var(--color-blue-400);
    box-shadow: 0 0 1.2rem rgba(37, 99, 235, 0.45);
}

.option__checkbox:checked + .option__toggle::after {
    transform: translateX(2rem);
    background: #fff;
}

.option__checkbox:focus-visible + .option__toggle {
    outline: 0.2rem solid var(--color-blue-400);
    outline-offset: 0.2rem;
}

.option__text {
    flex: 1;
    font-size: var(--fs-base);
    color: var(--color-text-primary);
    transition: color var(--t-normal);
}

.option__sample {
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    font-family: 'Courier New', monospace;
    background: rgba(255, 255, 255, 0.05);
    border: 0.1rem solid rgba(255, 255, 255, 0.08);
    padding: 0.1rem 0.5rem;
    border-radius: var(--r-sm);
    margin-left: var(--sp-xs);
}

/* Estado activo del label */
.option__label:has(.option__checkbox:checked) {
    background: rgba(37, 99, 235, 0.06);
    border-color: rgba(59, 130, 246, 0.3);
}

/* ====== Mensaje de error ====== */
.error-message {
    font-size: var(--fs-sm);
    color: var(--color-weak);
    text-align: center;
    min-height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-md);
    transition: all var(--t-normal);
    overflow: hidden;
    max-height: 0;
    padding: 0;
}

.error-message:not(:empty) {
    max-height: 8rem;
    padding: var(--sp-sm) var(--sp-md);
    background: rgba(248, 113, 113, 0.08);
    border: 0.1rem solid rgba(248, 113, 113, 0.2);
}

/* ====== Botón Generar ====== */
.btn-generate {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-sm);
    width: 100%;
    padding: var(--sp-md) var(--sp-xl);
    background: var(--gradient-brand);
    border: none;
    border-radius: var(--r-md);
    color: #fff;
    font-size: var(--fs-base);
    font-weight: 700;
    letter-spacing: 0.05rem;
    cursor: pointer;
    transition: transform var(--t-normal), box-shadow var(--t-normal);
    box-shadow: 0 0.4rem 1.8rem rgba(37, 99, 235, 0.45);
    overflow: hidden;
}

.btn-generate::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--t-fast);
}

.btn-generate:hover {
    transform: translateY(-0.25rem);
    box-shadow: 0 0.8rem 3rem rgba(37, 99, 235, 0.65);
}

.btn-generate:hover::before {
    opacity: 1;
}

.btn-generate:active {
    transform: translateY(0);
    box-shadow: 0 0.2rem 1rem rgba(37, 99, 235, 0.4);
}

.btn-generate:focus-visible {
    outline: 0.2rem solid var(--color-cyan-400);
    outline-offset: 0.3rem;
}

.btn-generate__icon {
    width: 2rem;
    height: 2rem;
    position: relative;
    z-index: 1;
    transition: transform var(--t-slow);
    flex-shrink: 0;
}

.btn-generate:hover .btn-generate__icon {
    transform: rotate(180deg);
}

.btn-generate.spin-once .btn-generate__icon {
    animation: spinOnce 0.45s ease-out;
}

@keyframes spinOnce {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ====== Utilidades ====== */
.icon--hidden {
    display: none !important;
}

/* ====== Footer ====== */
.footer {
    position: relative;
    z-index: 1;
    padding: var(--sp-md) var(--sp-md) var(--sp-lg);
    text-align: center;
}

.footer__text {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-xs);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
}

.footer__icon {
    width: 1.4rem;
    height: 1.4rem;
    flex-shrink: 0;
}

/* ====== Responsive ====== */
@media (max-width: 600px) {
    .header {
        padding: var(--sp-lg) var(--sp-md) var(--sp-md);
    }

    .header__title {
        font-size: var(--fs-xl);
    }

    .card {
        padding: var(--sp-lg);
        border-radius: var(--r-lg);
        gap: var(--sp-md);
    }

    .password-field {
        padding: var(--sp-xs) var(--sp-sm);
    }

    .password-field__input {
        font-size: var(--fs-base);
        letter-spacing: 0.06rem;
    }

    .control-group__value {
        font-size: var(--fs-lg);
    }

    .option__label {
        padding: var(--sp-sm);
        gap: var(--sp-sm);
    }

    .option__text {
        font-size: var(--fs-sm);
    }

    .btn-generate {
        padding: var(--sp-md);
        font-size: var(--fs-sm);
    }
}

@media (max-width: 380px) {
    .card {
        padding: var(--sp-md);
    }

    .option__sample {
        display: none;
    }

    .header__subtitle {
        font-size: 1.2rem;
    }
}

/* Accesibilidad: reducir movimiento */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}