:root {
    /* Colores Sky */
    --bg-body: #ffffff;  
    --sky-50: #f0f9ff;
    --bg-card: #bae6fd;
    --text-icon: #0ea5e9;
    --border-card: #0369a1;
    --sky-900: #0c4a6e;
    --cyan: #00d4ff;
    
    /* Colores Gray */
    --gray-50: #f9fafb;
    --border-input: #e5e7eb;      
    --gray-400: #9ca3af;
    --gray-600: #4b5563;
    --gray-800: #1f2937;
    --text-primary: #1f2937;      /* gray-800 */
    --text-secondary: #000000;
    --text-muted: #6b7280;        /* gray-500 */
   
    /* Colores Blue */
    --blue-500: #3b82f6;
    --bg-button: #2563eb;
    --text-link: #2563eb;         /* blue-600 */
    --bg-button-hover: #1d4ed8;
    --text-link-hover: #1d4ed8;   /* blue-700 */

    --pink: #ff3fa4;
    --orange: #f77f00;
    --orange-hover: #d62828;
    --green: #00e676;
    /* Colores Yellow/Warning */
    --yellow: #ffe135;
    --bg-alert: #fefce8; 
    --border-alert: #fef08a;
    --yellow-500: #eab308;
    --yellow-800: #854d0e;
    --text-alert: #854d0e;        /* yellow-800 */
    --yellow-900: #713f12;
    
    /* Colores Neutrales para Dark Mode */
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;

    --black: #0d0d0d;
    --white: #fffef5;
    
    /* Sombras */
    --shadow: 4px 4px 0px var(--black);
    --shadow-text: 4px 4px 0px var(--white);
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 6px 6px 0px var(--black);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-card: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.1);

    --border: 3px solid var(--black);
    --border-thick: 4px solid var(--black);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius: 10px;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    
    /* Tipografía */
    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    /* Toggle button */
    --toggle-text: #262626;
    --toggle-bg: #f3f4f6;
    --toggle-border: #d1d5db;
    --toggle-icon: #374151;
}

/* ========================================
   VARIABLES CSS - MODO OSCURO
   ======================================== */
[data-theme="dark"] {
    /* Colores principales */
    --bg-body: #171717;           /* neutral-900 */
    --bg-card: #1f2937;           /* gray-800 */
    --bg-button: #3b82f6;         /* blue-500 */
    --bg-button-hover: #60a5fa;   /* blue-400 */
    --bg-alert: rgba(234, 179, 8, 0.1);
    
    /* Bordes */
    --border-card: #374151;       /* gray-700 */
    --border-input: #404040;      /* neutral-700 */
    --border-alert: #713f12;      /* yellow-900 */
    
    /* Textos */
    --text-primary: #ffffff;
    --text-secondary: #f3f4f6;
    --text-muted: #9ca3af;        /* gray-400 */
    --text-link: #60a5fa;         /* blue-400 */
    --text-link-hover: #93c5fd;   /* blue-300 */
    --text-alert: #fcd34d;        /* yellow-300 */
    --text-icon: #38bdf8;         /* sky-400 */
    
    /* Sombras y efectos */
    --shadow: 4px 4px 0px var(--white);
    --shadow-card: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-focus: 0 0 0 3px rgba(96, 165, 250, 0.3);
    --shadow-lg: 6px 6px 0px var(--white);
    --shadow-text: 4px 4px 0px var(--black);
    
    /* Toggle button */
    --toggle-text: #f3f4f6;
    --toggle-bg: #374151;
    --toggle-border: #4b5563;
    --toggle-icon: #f3f4f6;
}

/* ========================================
   ESTILOS BASE
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

        body {
            font-family: 'Nunito', sans-serif;
            background-color: var(--white);
            background-image: radial-gradient(circle, rgba(0, 0, 0, 0.08) 1px, transparent 1px);
            background-size: 20px 20px;
            color: var(--black);
            overflow-x: hidden;
            line-height: 1.5;
            min-height: 100vh;
        }

/* ── NAVBAR ── */
        .navbar {
            background: var(--yellow);
            border-bottom: var(--border-thick);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 0 var(--black);
        }

        .navbar-inner {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
            height: 68px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            transition: transform 0.2s cubic-bezier(.17, .67, .24, 1.6);
        }

        .logo:hover {
            transform: scale(1.05) rotate(-2deg);
        }

        .logo-icon {
            font-size: 2rem;
            line-height: 1;
            filter: drop-shadow(2px 2px 0 var(--black));
            animation: bounce 1s ease infinite;
        }

        @keyframes bounce {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-5px);
            }
        }

        .logo-text {
            font-family: 'Bangers', cursive;
            font-size: 2rem;
            letter-spacing: 3px;
            color: var(--black);
            text-shadow: 2px 2px 0 var(--white);
        }

        .nav-links {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .btn-outline {
            font-family: 'Nunito', sans-serif;
            font-weight: 700;
            font-size: 0.85rem;
            padding: 8px 18px;
            border: var(--border);
            background: transparent;
            border-radius: var(--radius);
            cursor: pointer;
            text-decoration: none;
            color: var(--black);
            transition: background 0.15s, transform 0.1s, box-shadow 0.1s;
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }

        .btn-outline::before {
            content: '';
            position: absolute;
            inset: 0;
            background: var(--white);
            transform: translateX(-100%);
            transition: transform 0.3s ease;
            z-index: -1;
        }

        .btn-outline:hover::before {
            transform: translateX(0);
        }

        .btn-outline:hover {
            transform: translate(-2px, -2px);
            box-shadow: 6px 6px 0 var(--black);
        }

        .btn-solid {
            font-family: 'Nunito', sans-serif;
            font-weight: 900;
            font-size: 0.9rem;
            padding: 9px 20px;
            border: var(--border);
            background: var(--pink);
            color: var(--white);
            border-radius: var(--radius);
            cursor: pointer;
            text-decoration: none;
            transition: transform 0.1s, box-shadow 0.1s, background 0.15s;
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }

        .btn-solid::before {
            content: '';
            position: absolute;
            inset: 0;
            background: var(--orange);
            transform: translateY(100%);
            transition: transform 0.3s ease;
            z-index: -1;
        }

        .btn-solid:hover::before {
            transform: translateY(0);
        }

        .btn-solid:hover {
            transform: translate(-2px, -2px);
            box-shadow: 6px 6px 0 var(--orange);
        }

        /* Mobile menu */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: var(--border);
            border-radius: var(--radius);
            padding: 8px 12px;
            cursor: pointer;
            font-size: 1.2rem;
            box-shadow: var(--shadow);
            background: var(--white);
        }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            background: var(--yellow);
            border-bottom: var(--border-thick);
            padding: 20px;
            z-index: 99;
            transform: translateY(-100%);
            opacity: 0;
            transition: all 0.3s ease;
        }

        .mobile-nav.open {
            transform: translateY(0);
            opacity: 1;
        }

        .mobile-nav a {
            display: block;
            padding: 12px;
            text-decoration: none;
            color: var(--black);
            font-weight: 700;
            border-bottom: 2px dashed var(--black);
            font-size: 1.1rem;
        }

        .mobile-nav a:last-child {
            border-bottom: none;
        }

        /* ── PAGE HEADER ── */
        .page-header {
            background: var(--black);
            border-bottom: var(--border-thick);
            padding: 50px 24px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .page-header::before {
            content: '¡VAMOS!';
            font-family: 'Bangers', cursive;
            font-size: 12rem;
            color: rgba(255, 255, 255, 0.2);
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(-8deg);
            pointer-events: none;
            white-space: nowrap;
        }

        .page-header h1 {
            font-family: 'Bangers', cursive;
            font-size: clamp(2.5rem, 6vw, 4rem);
            color: var(--yellow);
            -webkit-text-stroke: 2px var(--black);
            letter-spacing: 3px;
            position: relative;
            z-index: 1;
            animation: popIn 0.5s cubic-bezier(.17, .67, .24, 1.6) both;
        }

        .page-header p {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--white);
            margin-top: 8px;
            opacity: 0.9;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            position: relative;
            z-index: 1;
            animation: slideUp 0.5s ease both 0.1s;
        }

@keyframes bounce {
    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

.logo-text {
    font-family: 'Bangers', cursive;
    font-size: 2rem;
    letter-spacing: 3px;
    color: var(--toggle-text);
    text-shadow: var(--shadow-text);
    /* text-shadow: 2px 2px 0 var(--white); */
}

.nav-links {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-outline {
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: 0.85rem;
    padding: 8px 18px;
    border: var(--border);
    background: transparent;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
    color: var(--black);
    transition: background 0.15s, transform 0.1s, box-shadow 0.1s;
    box-shadow: var(--shadow);
}

.btn-outline:hover {
    background: var(--white);
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--black);
}



/* ========================================
   CONTENEDOR PRINCIPAL
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.row {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
}

.row h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}

ol li {
    margin-bottom: 0.5rem;
    color: var(--gray-600);
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.6;
}

ul, ul li {
    margin-left: 1rem;
    margin-bottom: 0.5rem;
    color: var(--gray-600);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.6;
}

/* ========================================
   BOTÓN TOGGLE DARK MODE
   ======================================== */
.theme-toggle {
    /* position: fixed;
    top: 1rem;
    right: 1rem; */
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0.5rem;
    background-color: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    border-radius: 9999px;
    cursor: pointer;
    color: var(--toggle-icon);
    z-index: 100;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--toggle-bg);
    transform: scale(1.05);
}

.theme-toggle:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* Mostrar/ocultar iconos según el tema */
.icon-sun,
.icon-moon {
    position: absolute;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

/* Por defecto (modo claro): mostrar luna, ocultar sol */
.icon-sun {
    opacity: 0;
    transform: scale(0.8);
}

.icon-moon {
    opacity: 1;
    transform: scale(1);
}

/* En modo oscuro: mostrar sol, ocultar luna */
[data-theme="dark"] .icon-sun {
    opacity: 1;
    transform: scale(1);
}

[data-theme="dark"] .icon-moon {
    opacity: 0;
    transform: scale(0.8);
}

/* ========================================
   LOGIN CARD
   ======================================== */

.login-card {
    width: 80%;
    max-width: 500px;
    margin-top: 2.5rem;
    background-color: var(--yellow);
    border: 6px solid var(--black);
    border-radius: 0.6rem;
    padding: 24px;
    /* box-shadow: var(--shadow-lg); */
    box-shadow: 0.7em 0.7em 0 #000000,
    inset 0 0 0 0.15em rgba(0, 0, 0, 0.05);
    transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    overflow: hidden;
    /* transform-origin: center; */
}

.card-content {
    padding: 1rem;
}

.card-header {
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-icon);
    gap: 0.75rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
}

.card-icon {
    width: 2.5rem;
    height: 2.5rem;
    fill: currentColor;
}

/* ========================================
   FORMULARIO
   ======================================== */
.login-form {
    margin-top: 1.25rem;
}

.form-group {
    display: grid;
    gap: 1rem;
}

.form-field {
    display: flex;
    flex-direction: column;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--black);
}

.form-input {
    width: 100%;
    padding: 0.5rem 1rem;
    background-color: var(--bg-body);
    border: var(--border-thick);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.card-body input {
  padding: 10px;
  margin-bottom: 15px;
  border: 3px solid #000;
  border-radius: 10px;
  font-size: 16px;
}

.form-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: var(--shadow-focus);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* ========================================
   CHECKBOX
   ======================================== */
.form-check {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.form-checkbox[type="checkbox"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    flex-shrink: 0;
    width: 1rem;
    height: 1rem;
    border: var(--border);
    border-radius: 0.25rem;
    background-color: var(--bg-body);
    color: #3b82f6;
    cursor: pointer;
    accent-color: #3b82f6;
}

.form-checkbox[type="checkbox"]:checked {
    background-color: #3b82f6;
}

.form-check-label {
    font-size: 0.875rem;
    color: var(--black);
    cursor: pointer;
}

/* ========================================
   ALERTA
   ======================================== */
.alert {
    margin: 0.5rem 1.5rem;
    padding: 1rem;
    font-size: 0.875rem;
    color: var(--text-alert);
    background-color: var(--bg-alert);
    border: 1px solid var(--border-alert);
    border-radius: 0.5rem;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.alert-content {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.alert-icon svg {
    width: 1rem;
    height: 1rem;
    margin-top: 0.125rem;
}

.alert-title {
    font-weight: 500;
}

.alert-close-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.375rem;
    margin-left: auto;
    background: transparent;
    border: none;
    border-radius: 0.375rem;
    color: currentColor;
    cursor: pointer;
    opacity: 0.7;
}

.alert-close-btn:hover {
    opacity: 1;
    background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .alert-close-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.alert-close-btn svg {
    width: 1rem;
    height: 1rem;
}

/* ========================================
   BOTÓN DE ENVÍO
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    background-color: var(--orange);
    border: var(--border-thick);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
    gap: 0.5rem;
}

.btn:hover {
    background-color: var(--orange-hover);
}

.btn:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.btn:disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* ========================================
   ENLACES
   ======================================== */
.login-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 1rem;
    margin-bottom: 1rem;
    gap: 0.75rem;
}

.link {
    color: var(--text-link);
    text-decoration: none;
    font-size: 0.875rem;
    font-family: 'Comic Sans MS', sans-serif;
}

.link:hover {
    color: var(--text-link-hover);
    text-decoration: underline;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (min-width: 768px) {
    .card-content {
        padding: 1.5rem;
    }
    .login-card {
        width: 50%;
    }
}

@media (min-width: 1024px) {
    .login-card {
        width: 33.333333%;
    }
}

/* ========================================
   UTILIDADES
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

        @media (max-width: 768px) {
            .nav-links .btn-outline {
                display: none;
            }

            .mobile-menu-btn {
                display: block;
            }

            .mobile-nav {
                display: block;
            }
        }

/* ----------------------------------------------------------------- footer */
footer {
    background: var(--black);
    color: var(--white);
    border-top: var(--border-thick);
    padding: 48px 24px 32px;
    text-align: center;
    margin-top: 2.5rem;
}
    .footer-logo {
    font-family: 'Bangers', cursive;
    font-size: 2.2rem;
    letter-spacing: 3px;
    color: var(--yellow);
    text-shadow: 2px 2px 0 var(--pink);
    margin-bottom: 20px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.footer-logo:hover {
    transform: scale(1.05) rotate(-2deg);
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--cyan);
    font-weight: 700;
}