/* ============================================
   FORMULARIO DE REGISTRO
   Principios de Crecimiento Financiero
   ============================================ */

/* ---------- Variables globales ---------- */
:root {
    --color-primary: #0a2540;
    --color-primary-light: #1e4a6b;
    --color-accent: #2c7be5;
    --color-accent-light: #64b5f6;
    --color-text: #0a2540;
    --color-text-soft: #4a6b8a;
    --color-text-muted: #7e9bb3;
    --color-border: #cbdae6;
    --color-border-hover: #9ab3c9;
    --color-bg-gradient-start: #f6f9fc;
    --color-bg-gradient-end: #e9f1f8;
    --color-error: #d93025;
    --color-error-bg: #fdecea;
    --color-success: #1a7f37;
    --color-success-bg: #e8f5ec;

    --radius-sm: 0.8rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    --shadow-card: 0 25px 50px -12px rgba(0, 0, 0, 0.25),
                   0 0 0 1px rgba(255, 255, 255, 0.6) inset;
    --shadow-button: 0 12px 25px -8px rgba(10, 37, 64, 0.4);
    --shadow-button-hover: 0 18px 30px -8px rgba(10, 37, 64, 0.5);
    --shadow-input: 0 2px 6px rgba(0, 0, 0, 0.02);
    --shadow-focus: 0 0 0 4px rgba(44, 123, 229, 0.15);

    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
}

/* ---------- Reset ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ---------- Body ---------- */
body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(145deg,
                var(--color-bg-gradient-start) 0%,
                var(--color-bg-gradient-end) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---------- Contenedor principal ---------- */
.register-container {
    position: relative;
    overflow: hidden;
    max-width: 780px;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: 2.5rem 2.8rem;
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease-out;
}

/* Barra decorativa superior con degradado */
.register-container::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg,
                var(--color-accent),
                var(--color-accent-light),
                var(--color-accent));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

/* ---------- Encabezado ---------- */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 0.4rem;
    background: linear-gradient(135deg,
                var(--color-primary) 0%,
                var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--color-primary); /* fallback */
}

.header .subtitle {
    display: inline-block;
    font-size: 1.1rem;
    color: var(--color-text-soft);
    font-weight: 400;
    letter-spacing: 0.3px;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #d0e2f0;
}

/* ---------- Cuadrícula del formulario ---------- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem 1.8rem;
    margin-bottom: 2rem;
}

/* ---------- Grupos de campos ---------- */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #2c577c;
    margin-left: 0.2rem;
}

/* Viñeta decorativa */
.input-group label::before {
    content: "•";
    color: var(--color-accent);
    font-weight: bold;
    margin-right: 0.3rem;
    font-size: 1.2rem;
    line-height: 1;
}

.input-group input {
    padding: 0.9rem 1.2rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: #ffffff;
    color: var(--color-text);
    font-weight: 500;
    outline: none;
    box-shadow: var(--shadow-input);
    transition: border-color var(--transition-fast),
                box-shadow var(--transition-fast),
                background var(--transition-fast);
}

.input-group input::placeholder {
    color: var(--color-border-hover);
    font-weight: 400;
    font-size: 0.95rem;
}

.input-group input:hover {
    border-color: var(--color-border-hover);
}

.input-group input:focus {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-focus);
    background: #ffffff;
}

/* Estado inválido nativo */
.input-group input:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
}

/* ---------- Botón de envío ---------- */
.btn-submit {
    width: 100%;
    padding: 1.2rem 1.8rem;
    background: linear-gradient(135deg,
                var(--color-primary) 0%,
                var(--color-primary-light) 100%);
    border: none;
    border-radius: 1.2rem;
    color: #ffffff;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    box-shadow: var(--shadow-button);
    transition: transform var(--transition-base),
                box-shadow var(--transition-base),
                background var(--transition-base);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-button-hover);
    background: linear-gradient(135deg, #123a5e 0%, #265f86 100%);
}

.btn-submit:active {
    transform: translateY(1px);
    box-shadow: 0 8px 15px -5px rgba(10, 37, 64, 0.4);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ---------- Alertas (errores / éxito desde FTL) ---------- */
.alert {
    padding: 0.9rem 1.2rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border-color: var(--color-error);
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border-color: var(--color-success);
}

/* ---------- Pie de página ---------- */
.footer-note {
    text-align: center;
    margin-top: 1.8rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    letter-spacing: 0.3px;
    line-height: 1.6;
}

/* ---------- Animación ---------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(25px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .register-container {
        padding: 2rem 1.5rem;
        border-radius: var(--radius-lg);
    }
    .register-container::before {
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }
    .header h1 {
        font-size: 1.7rem;
    }
    .header .subtitle {
        font-size: 1rem;
    }
}

@media (max-width: 580px) {
    .form-grid {
        grid-template-columns: 1fr;
        gap: 1.3rem;
    }
}