/* ═══════════════════════════════════════════════════════════
   StudyLink — Auth Pages (Login / Register)
   Design Liquid Glass — fidèle aux templates
   ═══════════════════════════════════════════════════════════ */

/* ── Auth Layout : Split Screen ──────────────────────────── */
.auth-page {
    min-height: 100vh;
    display: flex;
    background: var(--color-gray-100);
}

/* ── Panneau gauche : Branding / Illustration ─────────────── */
.auth-page__branding {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-12) var(--space-8);
    background: linear-gradient(135deg, #7B3FE4 0%, #A78BFA 50%, #C4B5FD 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
    color: var(--color-white);
}

/* Cercles décoratifs flottants */
.auth-page__branding::before,
.auth-page__branding::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
}

.auth-page__branding::before {
    width: 400px;
    height: 400px;
    top: -100px;
    left: -100px;
    animation: float 6s ease-in-out infinite;
}

.auth-page__branding::after {
    width: 300px;
    height: 300px;
    bottom: -80px;
    right: -80px;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.auth-branding__content {
    position: relative;
    z-index: 2;
    max-width: 400px;
}

.auth-branding__illustration {
    width: 280px;
    height: auto;
    margin-bottom: var(--space-8);
    animation: float 5s ease-in-out infinite;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.15));
}

.auth-branding__illustration svg {
    width: 100%;
    height: auto;
}

.auth-branding__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
    line-height: 1.2;
}

.auth-branding__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.85;
    line-height: 1.6;
    font-weight: 300;
}

/* Indicateurs de slide / dots */
.auth-branding__dots {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-8);
}

.auth-branding__dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.35);
    cursor: pointer;
    transition: var(--transition-base);
}

.auth-branding__dot--active {
    background: var(--color-white);
    width: 28px;
}

/* ── Panneau droit : Formulaire ──────────────────────────── */
.auth-page__form-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-12) var(--space-8);
    background: var(--color-white);
    overflow-y: auto;
}

.auth-form-container {
    width: 100%;
    max-width: 440px;
}

/* ── Tabs Login / Register ────────────────────────────────── */
.auth-tabs {
    display: flex;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-8);
    background: var(--color-gray-100);
}

.auth-tabs__tab {
    flex: 1;
    padding: 12px 20px;
    text-align: center;
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    transition: var(--transition-base);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
}

.auth-tabs__tab--active {
    background: var(--color-white);
    color: var(--color-primary);
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(139, 82, 250, 0.1);
}

.auth-tabs__tab:hover:not(.auth-tabs__tab--active) {
    color: var(--color-primary);
}

/* ── Titre du formulaire ──────────────────────────────────── */
.auth-form__header {
    margin-bottom: var(--space-6);
}

.auth-form__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-1);
}

.auth-form__subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* ── Social Login Buttons ─────────────────────────────────── */
.auth-social {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.auth-social__btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-full);
    background: var(--color-white);
    color: var(--color-dark);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
}

.auth-social__btn:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

.auth-social__btn svg,
.auth-social__btn img {
    width: 20px;
    height: 20px;
}

/* Divider  */
.auth-divider {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    color: var(--color-gray-500);
    font-size: var(--font-size-xs);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-gray-300);
}

/* ── Form Fields ──────────────────────────────────────────── */
.form-group {
    margin-bottom: var(--space-5);
    position: relative;
}

.form-group--row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    color: var(--color-dark);
    font-size: var(--font-size-sm);
    outline: none;
    transition: var(--transition-base);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(139, 82, 250, 0.1);
}

.form-input::placeholder {
    color: var(--color-gray-400);
}

.form-input--error {
    border-color: var(--color-danger) !important;
}

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

.form-input-icon {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-400);
    cursor: pointer;
}

.form-error {
    display: block;
    color: var(--color-danger);
    font-size: var(--font-size-xs);
    margin-top: var(--space-1);
}

/* Select */
.form-select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    background: var(--color-white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236c757d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 14px center;
    color: var(--color-dark);
    font-size: var(--font-size-sm);
    appearance: none;
    outline: none;
    transition: var(--transition-base);
    cursor: pointer;
}

.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(139, 82, 250, 0.1);
}

/* Checkbox / Radio */
.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.form-checkbox input[type="checkbox"],
.form-checkbox input[type="radio"] {
    accent-color: var(--color-primary);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
}

.form-checkbox a {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ── Password Strength Meter ──────────────────────────────── */
.password-strength {
    margin-top: var(--space-2);
}

.password-strength__bar {
    height: 4px;
    border-radius: 2px;
    background: var(--color-gray-200);
    overflow: hidden;
}

.password-strength__fill {
    height: 100%;
    width: 0%;
    border-radius: 2px;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.password-strength__fill--weak { width: 25%; background: var(--color-danger); }
.password-strength__fill--fair { width: 50%; background: var(--color-warning); }
.password-strength__fill--good { width: 75%; background: #60A5FA; }
.password-strength__fill--strong { width: 100%; background: var(--color-success); }

.password-strength__label {
    font-size: var(--font-size-xs);
    margin-top: 4px;
    color: var(--color-gray-500);
}

/* ── Auth Form Footer ─────────────────────────────────────── */
.auth-form__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.auth-form__forgot {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    text-decoration: none;
}

.auth-form__forgot:hover {
    text-decoration: underline;
}

.auth-form__submit {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: 0 4px 14px rgba(139, 82, 250, 0.35);
}

.auth-form__submit:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 6px 20px rgba(139, 82, 250, 0.45);
    transform: translateY(-1px);
}

.auth-form__submit:active {
    transform: translateY(0);
}

.auth-form__submit:disabled {
    background: var(--color-gray-400);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.auth-form__alt-link {
    display: block;
    text-align: center;
    margin-top: var(--space-6);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.auth-form__alt-link a {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

.auth-form__alt-link a:hover {
    text-decoration: underline;
}

/* ── Alert messages ───────────────────────────────────────── */
.auth-alert {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-5);
    font-size: var(--font-size-sm);
}

.auth-alert--success {
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
}

.auth-alert--error {
    background: #FEF2F2;
    color: #991B1B;
    border: 1px solid #FECACA;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
    .auth-page {
        flex-direction: column;
    }

    .auth-page__branding {
        padding: var(--space-8) var(--space-6);
        min-height: 280px;
    }

    .auth-branding__illustration {
        width: 180px;
        margin-bottom: var(--space-4);
    }

    .auth-branding__title {
        font-size: var(--font-size-2xl);
    }

    .auth-page__form-panel {
        padding: var(--space-8) var(--space-6);
    }
}

@media (max-width: 480px) {
    .auth-page__branding {
        min-height: 200px;
        padding: var(--space-6) var(--space-4);
    }

    .auth-branding__illustration {
        width: 140px;
    }

    .auth-branding__title {
        font-size: var(--font-size-xl);
    }

    .auth-branding__subtitle {
        font-size: var(--font-size-sm);
    }

    .auth-page__form-panel {
        padding: var(--space-6) var(--space-4);
    }

    .form-group--row {
        grid-template-columns: 1fr;
    }
}