/* =====================================================
   Auth layout — partagé entre Login, Init, Error
   Split layout : brand panel gauche / contenu droit
   ===================================================== */

/* ── Keyframes ── */

@keyframes auth-slide-up {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes auth-bounce-in {
    from { opacity: 0; transform: scale(0.7); }
    60%  { transform: scale(1.08); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes auth-shake {
    0%, 100% { transform: translateX(0); }
    20%      { transform: translateX(-6px); }
    40%      { transform: translateX(6px); }
    60%      { transform: translateX(-4px); }
    80%      { transform: translateX(4px); }
}

@keyframes auth-shimmer {
    0%   { background-position: -600px 0; }
    100% { background-position:  600px 0; }
}

/* ── Page — split layout ── */

.auth-page {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 100vh;
    font-family: var(--mts-font-family);
}

/* ── Panneau gauche — brand ── */

.auth-brand {
    position: relative;
    background: linear-gradient(145deg, var(--mts-primary-900) 0%, var(--mts-primary-700) 55%, var(--mts-primary-600) 100%);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--mts-space-16);
}

.auth-brand__inner {
    position: relative;
    z-index: 1;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-5);
}

.auth-brand__logo {
    width: 220px;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
    flex-shrink: 0;
}

.auth-brand__logo img {
    width: 100%;
    height: auto;
    display: block;
}

.auth-brand__name {
    font-size: clamp(1.75rem, 2.5vw, 2.5rem);
    font-weight: var(--mts-font-weight-bold);
    color: #ffffff;
    line-height: 1.15;
    letter-spacing: var(--mts-letter-spacing-tight);
    margin: 0;
}

.auth-brand__name span {
    color: var(--mts-secondary-300);
}

.auth-brand__headline {
    font-size: var(--mts-font-size-lg);
    font-weight: var(--mts-font-weight-semibold);
    color: rgba(255, 255, 255, 0.92);
    line-height: var(--mts-line-height-tight);
    margin: 0;
    padding-bottom: var(--mts-space-1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.auth-brand__body {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-3);
}

.auth-brand__body p {
    font-size: var(--mts-font-size-sm);
    color: rgba(255, 255, 255, 0.65);
    line-height: var(--mts-line-height-relaxed);
    margin: 0;
}

.auth-brand__body p strong {
    color: rgba(255, 255, 255, 0.85);
    font-weight: var(--mts-font-weight-medium);
}

/* Cercles décoratifs */

.auth-brand__decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.auth-brand__circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.auth-brand__circle--1 {
    width: 500px;
    height: 500px;
    bottom: -200px;
    right: -160px;
}

.auth-brand__circle--2 {
    width: 300px;
    height: 300px;
    bottom: -80px;
    right: 40px;
    background: rgba(255, 255, 255, 0.05);
}

.auth-brand__circle--3 {
    width: 160px;
    height: 160px;
    top: 8%;
    right: -50px;
    background: rgba(184, 134, 11, 0.07);
    border-color: rgba(184, 134, 11, 0.14);
}

/* ── Panneau droit — contenu ── */

.auth-form-panel {
    background: var(--mts-neutral-50);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--mts-space-8);
}

/* ── Card de base ── */

.auth-card {
    background: var(--mts-neutral-0);
    border: 1px solid var(--mts-border-subtle);
    border-radius: var(--mts-radius-xl);
    box-shadow: var(--mts-shadow-lg);
    padding: var(--mts-space-10);
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-6);
    animation: auth-slide-up 350ms cubic-bezier(0, 0, 0.2, 1) both;
}

/* ── Skeleton ── */

.auth-skeleton__header {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-2);
}

.auth-skeleton__fields {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-4);
}

.auth-skeleton__field {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-2);
}

.auth-skeleton__oauth {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--mts-space-3);
}

.auth-skeleton__bar,
.auth-skeleton__input,
.auth-skeleton__btn,
.auth-skeleton__divider,
.auth-skeleton__oauth-btn {
    border-radius: var(--mts-radius-md);
    background: linear-gradient(
        90deg,
        var(--mts-neutral-100) 25%,
        var(--mts-neutral-200) 50%,
        var(--mts-neutral-100) 75%
    );
    background-size: 600px 100%;
    animation: auth-shimmer 1.6s ease-in-out infinite;
}

.auth-skeleton__bar            { height: 14px; }
.auth-skeleton__bar--title     { width: 45%; height: 28px; }
.auth-skeleton__bar--subtitle  { width: 65%; height: 13px; }
.auth-skeleton__bar--label     { width: 35%; height: 12px; }
.auth-skeleton__input          { height: var(--mts-height-md); }
.auth-skeleton__btn            { height: var(--mts-height-md); }
.auth-skeleton__oauth-btn      { height: var(--mts-height-md); }

.auth-skeleton__divider {
    height: 1px;
    background: var(--mts-neutral-200);
    animation: none;
}

/* ── Spinner standalone (Init, etc.) ── */

.auth-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--mts-neutral-200);
    border-top-color: var(--mts-primary-400);
    border-radius: 50%;
    animation: auth-spin 0.75s linear infinite;
    flex-shrink: 0;
}

/* ── Card header (partagé) ── */

.auth-card__header {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.auth-card__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--mts-text-primary);
    letter-spacing: -0.02em;
    margin: 0;
}

.auth-card__subtitle {
    font-size: 0.8125rem;
    color: var(--mts-text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* ── Boutons partagés (Error, Init) ── */

.auth-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    height: 42px;
    padding: 0 1.5rem;
    border-radius: 10px;
    font-size: 0.9375rem;
    font-family: var(--mts-font-family);
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid transparent;
    width: 100%;
    white-space: nowrap;
    transition: background 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.auth-btn--primary {
    background: var(--mts-primary-500);
    color: #ffffff;
    border-color: var(--mts-primary-500);
}

.auth-btn--primary:hover {
    background: var(--mts-primary-600);
    border-color: var(--mts-primary-600);
    box-shadow: 0 4px 14px rgba(var(--mts-primary-rgb), 0.35);
}

.auth-btn--secondary {
    background: var(--mts-neutral-0);
    color: var(--mts-primary-600);
    border-color: var(--mts-primary-200);
    font-weight: 500;
}

.auth-btn--secondary:hover {
    background: var(--mts-primary-50);
    border-color: var(--mts-primary-400);
}

/* ── Card d'erreur ── */

.auth-error-icon {
    width: 56px;
    height: 56px;
    background: var(--mts-danger-50);
    border: 1.5px solid var(--mts-danger-100);
    border-radius: var(--mts-radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--mts-danger-500);
    animation: auth-bounce-in 350ms cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.auth-error-icon svg {
    width: 28px;
    height: 28px;
}

.auth-error-actions {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-3);
}

/* ── Card header ── */

.auth-card__header {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.auth-card__title {
    font-size: var(--mts-font-size-2xl);
    font-weight: var(--mts-font-weight-bold);
    color: var(--mts-text-primary);
    letter-spacing: var(--mts-letter-spacing-tight);
    margin: 0;
}

.auth-card__subtitle {
    font-size: var(--mts-font-size-sm);
    color: var(--mts-text-secondary);
    margin: 0;
}

/* ── Champs ── */

.auth-fields {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-4);
}

.auth-fields-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--mts-space-3);
}

.auth-field {
    display: flex;
    flex-direction: column;
    gap: var(--mts-space-2);
}

.auth-field__label {
    font-size: var(--mts-font-size-sm);
    font-weight: var(--mts-font-weight-medium);
    color: var(--mts-text-primary);
    letter-spacing: 0.01em;
}

.auth-field__input {
    height: var(--mts-height-md);
    padding: 0 var(--mts-space-4);
    background: var(--mts-neutral-0);
    border: 1.5px solid var(--mts-border-default);
    border-radius: var(--mts-radius-md);
    font-size: var(--mts-font-size-md);
    font-family: var(--mts-font-family);
    color: var(--mts-text-primary);
    transition: border-color 150ms cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    width: 100%;
    box-sizing: border-box;
}

.auth-field__input::placeholder { color: var(--mts-text-placeholder); }
.auth-field__input:hover:not(:disabled) { border-color: var(--mts-neutral-400); }

.auth-field__input:focus {
    border-color: var(--mts-primary-500);
    box-shadow: 0 0 0 3px rgba(var(--mts-primary-rgb), 0.12);
}

.auth-field__input:disabled {
    background: var(--mts-neutral-100);
    color: var(--mts-text-disabled);
    cursor: not-allowed;
}

/* ── Champ en erreur ── */

.auth-field__input--error {
    border-color: var(--mts-danger-400);
}

.auth-field__input--error:hover:not(:disabled) {
    border-color: var(--mts-danger-500);
}

.auth-field__input--error:focus {
    border-color: var(--mts-danger-500);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.auth-field__error {
    font-size: var(--mts-font-size-xs);
    color: var(--mts-danger-600);
    margin-top: calc(-1 * var(--mts-space-1));
    display: flex;
    align-items: center;
    gap: var(--mts-space-1);
}

/* ── Spinner dans bouton ── */

.auth-btn__spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: auth-spin 0.65s linear infinite;
    flex-shrink: 0;
}

.auth-btn__spinner--dark {
    border-color: rgba(var(--mts-primary-rgb), 0.2);
    border-top-color: var(--mts-primary-500);
}

/* ── Séparateur OAuth ── */

.auth-divider {
    display: flex;
    align-items: center;
    gap: var(--mts-space-3);
    color: var(--mts-text-secondary);
    font-size: var(--mts-font-size-xs);
    text-transform: uppercase;
    letter-spacing: var(--mts-letter-spacing-wider);
}

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

/* ── Switch login/signup ── */

.auth-switch {
    text-align: center;
    font-size: var(--mts-font-size-sm);
    color: var(--mts-text-secondary);
    margin: 0;
}

.auth-switch__link {
    background: none;
    border: none;
    padding: 0;
    font-size: inherit;
    font-family: var(--mts-font-family);
    font-weight: var(--mts-font-weight-semibold);
    color: var(--mts-primary-500);
    cursor: pointer;
    transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.auth-switch__link:hover:not(:disabled) { color: var(--mts-primary-700); text-decoration: underline; }
.auth-switch__link:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Mot de passe oublié ── */

.auth-forgot {
    text-align: right;
    margin-top: calc(-1 * var(--mts-space-2));
}

/* ── OAuth buttons grid ── */

.auth-oauth {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--mts-space-3);
}

/* ── Responsive ── */

@media (max-width: 820px) {
    .auth-page {
        grid-template-columns: 1fr;
    }

    .auth-brand {
        display: none;
    }

    .auth-form-panel {
        padding: var(--mts-space-6) var(--mts-space-4);
        align-items: flex-start;
        padding-top: var(--mts-space-16);
    }

    .auth-card {
        padding: var(--mts-space-8) var(--mts-space-6);
    }
}

/* ── App loader — splash screen pendant le check BFF au démarrage ── */

.app-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, var(--mts-primary-900) 0%, var(--mts-primary-700) 55%, var(--mts-primary-600) 100%);
}

.app-loader__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--mts-space-5);
    animation: auth-slide-up 400ms cubic-bezier(0, 0, 0.2, 1) both;
}

.app-loader__logo {
    width: 200px;
    filter: drop-shadow(0 4px 16px rgba(0, 0, 0, 0.4));
}

.app-loader__logo img {
    width: 100%;
    height: auto;
    display: block;
}

.app-loader__name {
    font-family: var(--mts-font-family);
    font-size: 1.875rem;
    font-weight: var(--mts-font-weight-bold);
    color: #ffffff;
    letter-spacing: var(--mts-letter-spacing-tight);
    text-align: center;
    line-height: 1.2;
    margin: 0;
}

.app-loader__name span {
    color: var(--mts-secondary-300);
}

.app-loader__spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: rgba(255, 255, 255, 0.85);
    border-radius: 50%;
    animation: auth-spin 0.8s linear infinite;
    margin-top: var(--mts-space-2);
}