/* =============================================================================
   MediQuiz — auth.css
   Authentication pages: login, register
   Mobile-first. BEM naming convention.
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Design tokens
   ----------------------------------------------------------------------------- */
:root {
    --color-primary:        #2563eb;   /* blue-600 */
    --color-primary-hover:  #1d4ed8;   /* blue-700 */
    --color-primary-light:  #eff6ff;   /* blue-50  */
    --color-danger:         #dc2626;   /* red-600  */
    --color-danger-light:   #fef2f2;   /* red-50   */
    --color-success:        #16a34a;   /* green-600 */
    --color-success-light:  #f0fdf4;   /* green-50  */
    --color-text:           #111827;   /* gray-900  */
    --color-text-muted:     #6b7280;   /* gray-500  */
    --color-border:         #d1d5db;   /* gray-300  */
    --color-border-focus:   #2563eb;
    --color-bg:             #f9fafb;   /* gray-50   */
    --color-white:          #ffffff;
    --color-google-border:  #dadce0;

    --font-family:          'Inter', system-ui, -apple-system, sans-serif;
    --font-size-sm:         0.875rem;  /* 14px */
    --font-size-base:       1rem;      /* 16px */
    --font-size-lg:         1.125rem;  /* 18px */
    --font-size-xl:         1.5rem;    /* 24px */

    --radius-sm:            0.375rem;  /* 6px  */
    --radius-md:            0.5rem;    /* 8px  */
    --radius-lg:            0.75rem;   /* 12px */
    --radius-full:          9999px;

    --shadow-card:          0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
    --transition-fast:      150ms ease;
}

/* -----------------------------------------------------------------------------
   Reset / base
   ----------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* -----------------------------------------------------------------------------
   Layout — auth-body / auth-container
   ----------------------------------------------------------------------------- */
.auth-body {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 1rem;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* -----------------------------------------------------------------------------
   Header / logo
   ----------------------------------------------------------------------------- */
.auth-header {
    text-align: center;
    padding-block: 0.5rem;
}

.auth-header__logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.auth-header__logo-text {
    font-size: var(--font-size-xl);
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.auth-header__logo-text strong {
    color: var(--color-primary);
    font-weight: 700;
}

/* -----------------------------------------------------------------------------
   Alert / flash messages
   ----------------------------------------------------------------------------- */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    border: 1px solid transparent;
}

.alert--error {
    background-color: var(--color-danger-light);
    border-color: #fca5a5; /* red-300 */
    color: var(--color-danger);
}

.alert--success {
    background-color: var(--color-success-light);
    border-color: #86efac; /* green-300 */
    color: var(--color-success);
}

/* -----------------------------------------------------------------------------
   Auth card
   ----------------------------------------------------------------------------- */
.auth-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.auth-card__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    line-height: 1.25;
}

.auth-card__subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    margin-top: -0.5rem;
}

.auth-card__footer-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

.auth-card__terms {
    font-size: 0.8125rem; /* 13px */
    color: var(--color-text-muted);
    text-align: center;
    line-height: 1.5;
}

/* -----------------------------------------------------------------------------
   Divider
   ----------------------------------------------------------------------------- */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

/* -----------------------------------------------------------------------------
   Buttons
   ----------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 0.6875rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                box-shadow var(--transition-fast);
    text-decoration: none;
    line-height: 1.25;
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Primary */
.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    text-decoration: none;
}

.btn--primary:active {
    transform: translateY(1px);
}

/* Full width */
.btn--full {
    width: 100%;
}

/* Google */
.btn--google {
    background-color: var(--color-white);
    color: var(--color-text);
    border-color: var(--color-google-border);
    font-weight: 500;
}

.btn--google:hover {
    background-color: #f8f9fa;
    text-decoration: none;
}

.btn__icon {
    width: 1.125rem;
    height: 1.125rem;
    flex-shrink: 0;
}

/* Loading state */
.btn[data-loading='true'] {
    opacity: 0.7;
    pointer-events: none;
    cursor: not-allowed;
}

/* -----------------------------------------------------------------------------
   Form elements
   ----------------------------------------------------------------------------- */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
}

.form-input-wrapper {
    position: relative;
    display: flex;
}

.form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
}

.form-input-wrapper .form-input {
    padding-right: 2.75rem; /* space for the toggle button */
    border-radius: var(--radius-md);
}

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

.form-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-input.is-invalid {
    border-color: var(--color-danger);
}

.form-input.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

/* Password visibility toggle */
.form-input-toggle {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    padding-inline: 0.75rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
}

.form-input-toggle:hover {
    color: var(--color-text);
}

.form-input-toggle svg {
    width: 1.125rem;
    height: 1.125rem;
    fill: currentColor;
    pointer-events: none;
}

/* Error / hint text */
.form-error {
    font-size: var(--font-size-sm);
    color: var(--color-danger);
    min-height: 1.25rem;
}

.form-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* -----------------------------------------------------------------------------
   Responsive — tablet and up (≥ 480px)
   ----------------------------------------------------------------------------- */
@media (min-width: 480px) {
    .auth-body {
        justify-content: center;
        padding: 2rem 1.5rem;
    }

    .auth-card {
        padding: 2.25rem 2rem;
    }
}

/* -----------------------------------------------------------------------------
   Legal note (register form, onboarding modal)
   ----------------------------------------------------------------------------- */
.auth-legal-note {
    font-size: var(--font-size-xs, 0.75rem);
    color: var(--color-text-muted);
    text-align: center;
    margin-top: var(--space-3);
    line-height: 1.5;
}
.auth-legal-note a { color: var(--color-text-secondary); }
.auth-legal-note a:hover { color: var(--color-primary); }