:root {
    --color-primary: #4CAF50;
    --color-primary-hover: #388E3C;
    --color-primary-light: rgba(76, 175, 80, 0.15);
    --color-neutral: #3b82f6;

    --color-bg-primary: #ffffff;
    --color-bg-page: #4CAF50;
    --color-bg-neutral-light: #eff6ff;

    --color-border-light: #e0e0e0;
    --color-border-focus: #4CAF50;
    --color-border-neutral: #93c5fd;

    --color-text-primary: #333;
    --color-text-secondary: #999;
    --color-text-neutral: #1e40af;

    --color-shadow-lg: rgba(0, 0, 0, 0.12);

    --btn-padding-y: 3px;
    --btn-padding-x: 20px;

    --radius-md: 12px;
    --radius-lg: 16px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg-page);
    margin: 0;
    padding: 24px 16px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    isolation: isolate;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url('../img/registre.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: blur(1px);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: -1;
}

.form-signin {
    width: 100%;
    max-width: 560px;
    padding: 40px 32px;
    margin: auto;
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 30px var(--color-shadow-lg);
}

.form-signin h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 6px;
    text-align: center;
    margin-top: 0;
    letter-spacing: -0.3px;
}

/* ── Hint ── */

.hint {
    margin: 0 0 20px 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    text-align: center;
}

/* ── Status Box ── */

.status-box {
    background: #f0fdf4;
    border: 1px solid #86efac;
    border-left: 4px solid var(--color-primary);
    color: #166534;
    border-radius: var(--radius-md);
    padding: 12px 14px;
    margin-bottom: 18px;
    font-size: 0.85rem;
    line-height: 1.45;
}

.status-box.neutral {
    background: var(--color-bg-neutral-light);
    border-color: var(--color-border-neutral);
    border-left-color: var(--color-neutral);
    color: var(--color-text-neutral);
}

/* ── Grid ── */

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

/* ── Labels ── */

.label-field {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 0.85rem;
}

.required {
    color: #e74c3c;
    font-weight: 700;
    margin-left: 2px;
}

/* ── Inputs & Textarea ── */

.input-field,
.textarea-field {
    width: 100%;
    box-sizing: border-box;
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    font-size: 0.95rem;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    font-family: inherit;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.input-field:focus,
.textarea-field:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.textarea-field {
    min-height: 92px;
    resize: vertical;
}

/* ── Validation ── */

.input-field.is-invalid,
.textarea-field.is-invalid {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.15);
}

.input-field.is-invalid:focus,
.textarea-field.is-invalid:focus {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.2);
}

.field-error {
    display: block;
    font-size: 0.75rem;
    color: #e74c3c;
    margin-top: 4px;
    font-weight: 500;
    padding-left: 2px;
    animation: fieldErrorIn 0.2s ease;
}

@keyframes fieldErrorIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Alerts ── */

.alert {
    margin-bottom: 20px;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    padding: 14px 16px;
    border: 1px solid;
    line-height: 1.5;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.alert-danger {
    background-color: #fdecea;
    border-color: #f5c6cb;
    border-left: 4px solid #e74c3c;
    color: #721c24;
}

.alert-dismissible {
    position: relative;
    padding-right: 40px;
}

.btn-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    line-height: 1;
    padding: 0;
}

.btn-close:hover {
    color: var(--color-text-primary);
}

/* ── Row ── */

.azn-row {
    margin-bottom: 14px;
}

/* ── Actions ── */

.azn-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 18px;
}

/* ── Buttons ── */

.azn-btn-primary {
    background: var(--color-primary);
    color: var(--color-bg-primary);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--btn-padding-y) var(--btn-padding-x);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.25s ease, transform 0.2s ease;
    flex: 1;
    min-width: 140px;
    text-align: center;
}

.azn-btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.azn-btn-outline {
    background: var(--color-bg-primary);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--btn-padding-y) var(--btn-padding-x);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    font-family: inherit;
    transition: all 0.25s ease;
    flex: 1;
    min-width: 140px;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.azn-btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-bg-primary);
}

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

/* ── Footer ── */

.azn-footer {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    margin-top: 18px;
    text-align: center;
    line-height: 1.5;
}

.azn-footer strong {
    color: var(--color-text-primary);
}

/* ── Responsive ── */

@media (max-width: 560px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .azn-actions {
        flex-direction: column;
    }

    .azn-btn-primary,
    .azn-btn-outline {
        min-width: 0;
    }

    .form-signin {
        padding: 28px 18px;
    }
}