/**
 * Registration Page Styles
 *
 * Learning Notes:
 * - The form is centred in a card container with a max-width.
 *   This keeps it readable on large screens without stretching.
 * - The loading state on the submit button uses the same pattern
 *   as subscription.css: transparent text + spinning ::after pseudo.
 * - Field error states use aria-invalid for accessibility, which
 *   we can also target with CSS via [aria-invalid="true"].
 */

/* ========================================
   LAYOUT
   ======================================== */

.register {
    padding: var(--space-12) 0 var(--space-20);
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-bg-alt) 100%);
    min-height: calc(100vh - 72px - 300px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.register__card {
    background: var(--color-white);
    border: var(--border-width) solid var(--border-color-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8) var(--space-8) var(--space-6);
    max-width: 460px;
    width: 100%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

/* ========================================
   HEADER
   ======================================== */

.register__header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.register__title {
    font-size: var(--font-size-2xl);
    color: var(--color-secondary);
    margin-bottom: var(--space-2);
}

.register__subtitle {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* ========================================
   STATUS BANNER
   ======================================== */

.register__status {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.register__status--error {
    background: rgba(235, 91, 80, 0.1);
    color: #c0392b;
    border: 1px solid rgba(235, 91, 80, 0.25);
}

.register__status--success {
    background: rgba(111, 186, 108, 0.12);
    color: #2d7a2a;
    border: 1px solid rgba(111, 186, 108, 0.3);
}

/* ========================================
   FORM FIELDS
   ======================================== */

.register__field {
    margin-bottom: var(--space-4);
}

.register__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    margin-bottom: var(--space-1);
}

.register__field input {
    width: 100%;
    padding: var(--space-3);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color 0.15s ease;
    box-sizing: border-box;
}

.register__field input:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(73, 74, 147, 0.1);
}

.register__field input[aria-invalid="true"] {
    border-color: #eb5b50;
}

.register__field-error {
    font-size: var(--font-size-xs);
    color: #c0392b;
    margin-top: var(--space-1);
}

/* ========================================
   SUBMIT BUTTON
   ======================================== */

.register__submit {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin-top: var(--space-2);
    border: none;
    cursor: pointer;
}

.register__submit--loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.register__submit--loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin: -9px 0 0 -9px;
    border: 2px solid var(--color-white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: register-spin 0.6s linear infinite;
}

@keyframes register-spin {
    to { transform: rotate(360deg); }
}

/* ========================================
   FOOTER LINKS
   ======================================== */

.register__login-link {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-5);
    margin-bottom: var(--space-2);
}

.register__login-link a {
    color: var(--color-primary);
    text-decoration: underline;
}

.register__terms {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    margin: 0;
}

.register__terms a {
    color: var(--color-text-muted);
    text-decoration: underline;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 500px) {
    .register__card {
        padding: var(--space-6) var(--space-4) var(--space-4);
    }
}