/* =========================================================
   Tema oscuro - Predictor de nivel de estrés
   Archivo: static/styles.css
   ========================================================= */


/* =========================================================
   Variables globales
   ========================================================= */

:root {
    /* Colores principales */
    --color-background: #0d1117;
    --color-surface: rgba(22, 27, 34, 0.94);
    --color-surface-secondary: rgba(13, 17, 23, 0.88);

    /* Bordes */
    --color-border: #30363d;
    --color-border-hover: #484f58;
    --color-border-focus: #58a6ff;

    /* Texto */
    --color-text: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-placeholder: #6e7681;

    /* Colores de acción */
    --color-primary: #238636;
    --color-primary-hover: #2ea043;
    --color-primary-shadow: rgba(35, 134, 54, 0.3);

    /* Títulos */
    --color-heading: #75bfff;

    /* Advertencias */
    --color-warning-background: rgba(93, 64, 12, 0.35);
    --color-warning-border: #d29922;
    --color-warning-text: #f0c36e;

    /* Errores */
    --color-error: #f85149;

    /* Tipografías */
    --font-heading: Georgia, "Times New Roman", serif;

    --font-body:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        "Helvetica Neue",
        Arial,
        sans-serif;

    /* Bordes redondeados */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;

    /* Sombras */
    --shadow-container: 0 18px 50px rgba(0, 0, 0, 0.5);
    --shadow-field: 0 4px 12px rgba(0, 0, 0, 0.2);
}


/* =========================================================
   Restablecimiento general
   ========================================================= */

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    color-scheme: dark;
}

body {
    min-height: 100vh;
    margin: 0;
    padding: 32px 16px;

    background-color: var(--color-background);

    /*
     * La imagen bg.jpg debe estar en:
     * static/bg.jpg
     */
    background-image:
        linear-gradient(
            rgba(13, 17, 23, 0.78),
            rgba(13, 17, 23, 0.94)
        ),
        url("bg.jpg");

    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;

    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
}


/* =========================================================
   Contenedor principal
   ========================================================= */

.container {
    width: min(60%, 720px);
    min-width: 320px;
    margin: 0 auto;
    padding: 32px;

    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-large);

    box-shadow: var(--shadow-container);

    /*
     * El fondo semitransparente permite observar
     * el desenfoque del contenido posterior.
     */
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}


/* =========================================================
   Encabezados
   ========================================================= */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: 0.01em;
}

h1,
h2 {
    margin: 0 0 20px;

    color: var(--color-heading);
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    line-height: 1.25;
    text-align: center;
    text-shadow: 0 0 14px rgba(88, 166, 255, 0.25);
}

.page-header {
    margin-bottom: 28px;
    text-align: center;
}

.page-header p {
    margin: 0 0 20px;

    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
}


/* =========================================================
   Mensaje de advertencia
   ========================================================= */

.warning {
    margin-bottom: 24px;
    padding: 14px 16px;

    background: var(--color-warning-background);
    border: 1px solid var(--color-warning-border);
    border-radius: var(--radius-small);

    color: var(--color-warning-text);
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.6;
    text-align: left;
}


/* =========================================================
   Formulario
   ========================================================= */

form {
    margin: 0;
    padding: 0;

    background: transparent;
    border: 0;
    box-shadow: none;
}

.form-group {
    margin-bottom: 20px;
}

.form-label,
.form-group label {
    display: block;
    margin-bottom: 8px;

    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.45;
}

.form-group label span {
    float: right;

    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 400;
}


/* =========================================================
   Campos de entrada
   ========================================================= */

.form-control,
.form-group input {
    display: block;
    width: 100%;
    min-height: 46px;
    padding: 12px 14px;

    background: var(--color-surface-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    outline: none;

    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.4;

    box-shadow: var(--shadow-field);

    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.2s ease;
}

.form-control::placeholder,
.form-group input::placeholder {
    color: var(--color-placeholder);
    font-family: var(--font-body);
}

.form-control:hover,
.form-group input:hover {
    background: rgba(31, 41, 55, 0.9);
    border-color: var(--color-border-hover);
}

.form-control:focus,
.form-group input:focus {
    background: rgba(13, 17, 23, 0.98);
    border-color: var(--color-border-focus);

    box-shadow:
        0 0 0 3px rgba(88, 166, 255, 0.2),
        var(--shadow-field);

    transform: translateY(-1px);
}

.form-control:invalid:not(:placeholder-shown),
.form-group input:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
}


/* =========================================================
   Campos numéricos
   ========================================================= */

input[type="number"] {
    appearance: textfield;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    margin: 0;
    opacity: 0.7;
}


/* =========================================================
   Botones
   ========================================================= */

.center-button {
    display: flex;
    justify-content: center;
    margin-top: 28px;
}

.btn,
button {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
}

.btn {
    width: 100%;
    min-height: 48px;
    padding: 13px 20px;

    border: 0;
    border-radius: var(--radius-small);
    cursor: pointer;

    transition:
        background-color 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.2s ease;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 8px 22px var(--color-primary-shadow);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(88, 166, 255, 0.55);
    outline-offset: 3px;
}


/* =========================================================
   Contenedor de resultados
   ========================================================= */

.result-container {
    width: min(40%, 520px);
    min-width: 300px;
    margin: 0 auto;
    padding: 28px;

    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);

    box-shadow: var(--shadow-container);
    text-align: center;

    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.result-text {
    margin: 0;

    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1.1rem;
    line-height: 1.65;
}


/* =========================================================
   Enlaces
   ========================================================= */

a {
    color: var(--color-heading);
    font-family: var(--font-body);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}


/* =========================================================
   Diseño para tabletas
   ========================================================= */

@media (max-width: 900px) {
    .container {
        width: min(82%, 720px);
    }

    .result-container {
        width: min(65%, 520px);
    }
}


/* =========================================================
   Diseño para teléfonos
   ========================================================= */

@media (max-width: 600px) {
    body {
        padding: 16px 10px;
        background-attachment: scroll;
    }

    .container,
    .result-container {
        width: 100%;
        min-width: 0;
        padding: 22px 16px;
        border-radius: var(--radius-medium);
    }

    h1,
    h2 {
        font-size: 1.8rem;
    }

    .form-group label {
        line-height: 1.5;
    }

    .form-group label span {
        display: block;
        float: none;
        margin-top: 3px;
    }

    .form-control,
    .form-group input {
        min-height: 48px;
        font-size: 16px;
    }
}


/* =========================================================
   Preferencia de reducción de movimiento
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}