/* =====================================================
   Imperial University College - Learning Platform
   Auth Pages
   ===================================================== */

/* =====================================================
   Keyframes
   ===================================================== */

@keyframes auth-slide-up {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes auth-slide-in-left {
    from {
        opacity: 0;
        transform: translateX(32px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes auth-slide-in-right {
    from {
        opacity: 0;
        transform: translateX(-32px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes auth-scale-in {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes auth-progress-fill {
    from { width: 0%; }
    to { width: var(--progress-width, 0%); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* =====================================================
   Auth Layout — Full Width (No Brand Side)
   ===================================================== */

.auth-layout {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--c-bg);
    padding: var(--sp-6) var(--sp-5);
    position: relative;
    overflow-x: hidden;
}

/* Background patterns */
.auth-layout::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(15, 23, 42, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(15, 23, 42, 0.025) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    z-index: 0;
}

.auth-layout::after {
    content: '';
    position: fixed;
    top: -300px;
    inset-inline-end: -300px;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(30, 64, 175, 0.06) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}

/* =====================================================
   Auth Container
   ===================================================== */

.auth-container {
    width: 100%;
    max-width: 520px;
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-xl);
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.04);
    padding: var(--sp-10) var(--sp-8);
    position: relative;
    z-index: 1;
    animation: auth-slide-up 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* =====================================================
   Header
   ===================================================== */

.auth-header {
    text-align: center;
    margin-bottom: var(--sp-8);
}

.auth-header__logo {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-3);
    text-decoration: none;
    margin-bottom: var(--sp-6);
    transition: transform var(--t-base);
}

.auth-header__logo:hover {
    transform: translateY(-2px);
}

.auth-header__logo-mark {
    width: 56px;
    height: 56px;
    background-color: transparent;
    border-radius: var(--r-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
}

.auth-header__logo-mark img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.auth-header__logo-text {
    display: flex;
    flex-direction: column;
    text-align: start;
    line-height: 1.25;
}

.auth-header__logo-text strong {
    color: var(--c-text);
    font-size: var(--fs-md);
    font-weight: var(--fw-bold);
    letter-spacing: -0.015em;
}

.auth-header__logo-text span {
    color: var(--c-text-tertiary);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-family: var(--font-en);
    margin-top: 2px;
}

.auth-header__title {
    font-size: 26px;
    font-weight: var(--fw-bold);
    color: var(--c-text);
    margin-bottom: var(--sp-2);
    letter-spacing: -0.025em;
    line-height: var(--lh-tight);
}

.auth-header__subtitle {
    font-size: var(--fs-sm);
    color: var(--c-text-secondary);
    line-height: var(--lh-relaxed);
}

/* =====================================================
   Progress Steps
   ===================================================== */

.auth-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-2);
    margin-bottom: var(--sp-8);
    position: relative;
}

.auth-step {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    position: relative;
    flex: 1;
}

.auth-step__num {
    width: 32px;
    height: 32px;
    border-radius: var(--r-full);
    background-color: var(--c-slate-100);
    color: var(--c-text-tertiary);
    border: 2px solid var(--c-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--fs-xs);
    font-weight: var(--fw-bold);
    font-family: var(--font-en);
    flex-shrink: 0;
    transition: all var(--t-slow);
    position: relative;
    z-index: 1;
}

.auth-step__num svg {
    width: 14px;
    height: 14px;
}

.auth-step.is-active .auth-step__num {
    background-color: var(--c-primary);
    color: var(--c-text-inverse);
    border-color: var(--c-primary);
    box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.12);
}

.auth-step.is-done .auth-step__num {
    background-color: var(--c-success);
    color: var(--c-text-inverse);
    border-color: var(--c-success);
}

.auth-step__label {
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    color: var(--c-text-tertiary);
    white-space: nowrap;
    transition: color var(--t-base);
}

.auth-step.is-active .auth-step__label,
.auth-step.is-done .auth-step__label {
    color: var(--c-text);
}

.auth-step__line {
    flex: 1;
    height: 2px;
    background-color: var(--c-border);
    margin: 0 var(--sp-1);
    border-radius: var(--r-full);
    position: relative;
    overflow: hidden;
}

.auth-step__line::after {
    content: '';
    position: absolute;
    inset: 0;
    background-color: var(--c-success);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--t-slower);
}

.auth-step.is-done + .auth-step .auth-step__line::after,
.auth-step.is-done .auth-step__line::after {
    transform: scaleX(1);
}

/* Hide labels on small screens */
@media (max-width: 520px) {
    .auth-step__label {
        display: none;
    }
}

/* =====================================================
   Step Content
   ===================================================== */

.auth-step-content {
    display: none;
}

.auth-step-content.is-active {
    display: block;
    animation: auth-slide-in-right 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-step-content.is-active.is-backward {
    animation: auth-slide-in-left 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-step-content__title {
    font-size: var(--fs-lg);
    font-weight: var(--fw-bold);
    color: var(--c-text);
    margin-bottom: var(--sp-1);
    letter-spacing: -0.015em;
}

.auth-step-content__subtitle {
    font-size: var(--fs-sm);
    color: var(--c-text-secondary);
    margin-bottom: var(--sp-6);
    line-height: var(--lh-relaxed);
}

/* =====================================================
   Form Body
   ===================================================== */

.auth-form__body {
    display: flex;
    flex-direction: column;
    gap: var(--sp-5);
}

.auth-form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-4);
}

@media (max-width: 520px) {
    .auth-form__row {
        grid-template-columns: 1fr;
    }
}

/* ---- Form Labels ---- */

.form-group .form-label {
    font-weight: var(--fw-semibold);
    font-size: var(--fs-sm);
    color: var(--c-text);
    letter-spacing: -0.005em;
    margin-bottom: var(--sp-2);
}

/* ---- Inputs ---- */

.form-input {
    height: 52px;
    font-size: var(--fs-md);
    font-weight: var(--fw-medium);
    padding-inline: var(--sp-4);
    border-radius: var(--r-md);
    border: 1.5px solid var(--c-border-dark);
    background-color: var(--c-surface);
    color: var(--c-text);
    transition: all var(--t-base);
    width: 100%;
}

.form-input::placeholder {
    color: var(--c-text-muted);
    font-weight: var(--fw-normal);
}

.form-input:hover:not(:disabled):not(:focus) {
    border-color: var(--c-slate-400);
    background-color: var(--c-slate-50);
}

.form-input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.1);
    background-color: var(--c-surface);
}

.form-input.is-error {
    border-color: var(--c-error);
}

.form-input.is-error:focus {
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.1);
}

/* ---- Password Wrapper ---- */

.password-wrapper {
    position: relative;
}

.password-wrapper .form-input {
    padding-inline-end: 52px;
}

.password-toggle {
    position: absolute;
    top: 50%;
    inset-inline-end: 10px;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--c-text-tertiary);
    cursor: pointer;
    border-radius: var(--r-sm);
    transition: all var(--t-fast);
}

.password-toggle:hover {
    color: var(--c-primary);
    background-color: var(--c-primary-light);
}

.password-toggle svg {
    width: 18px;
    height: 18px;
}

/* ---- Terms ---- */

.auth-form__terms {
    display: flex;
    align-items: flex-start;
    gap: var(--sp-3);
    padding: var(--sp-3) 0;
}

.auth-form__terms input[type="checkbox"] {
    margin-top: 3px;
    width: 18px;
    height: 18px;
    accent-color: var(--c-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.auth-form__terms label {
    font-size: var(--fs-sm);
    color: var(--c-text-secondary);
    line-height: var(--lh-relaxed);
    cursor: pointer;
}

.auth-form__terms a {
    color: var(--c-primary);
    font-weight: var(--fw-semibold);
    text-decoration: none;
}

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

/* =====================================================
   Step Navigation Buttons
   ===================================================== */

.auth-nav {
    display: flex;
    gap: var(--sp-3);
    margin-top: var(--sp-3);
}

.auth-nav .btn {
    flex: 1;
    height: 54px;
    font-size: var(--fs-md);
    font-weight: var(--fw-bold);
    letter-spacing: 0.01em;
    border-radius: var(--r-md);
    transition: all var(--t-base);
}

.auth-nav .btn--primary {
    background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-hover) 100%);
    border: none;
    box-shadow: 0 4px 14px rgba(30, 64, 175, 0.24);
    position: relative;
    overflow: hidden;
}

.auth-nav .btn--primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--c-primary-hover) 0%, var(--c-primary-active) 100%);
    opacity: 0;
    transition: opacity var(--t-base);
}

.auth-nav .btn--primary > * {
    position: relative;
    z-index: 1;
}

.auth-nav .btn--primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(30, 64, 175, 0.36);
}

.auth-nav .btn--primary:hover:not(:disabled)::before {
    opacity: 1;
}

.auth-nav .btn--secondary {
    background-color: var(--c-slate-100);
    color: var(--c-text);
    border: 1.5px solid var(--c-border-dark);
}

.auth-nav .btn--secondary:hover:not(:disabled) {
    background-color: var(--c-slate-200);
    border-color: var(--c-slate-400);
}

/* =====================================================
   Footer
   ===================================================== */

.auth-footer {
    margin-top: var(--sp-6);
    padding-top: var(--sp-6);
    border-top: 1px solid var(--c-border-soft);
    text-align: center;
    font-size: var(--fs-sm);
    color: var(--c-text-secondary);
}

.auth-footer a {
    font-weight: var(--fw-bold);
    color: var(--c-primary);
    transition: color var(--t-fast);
    margin-inline-start: 4px;
}

.auth-footer a:hover {
    color: var(--c-primary-hover);
    text-decoration: underline;
}

/* =====================================================
   Pending Card
   ===================================================== */

.pending-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--sp-6);
    background-color: var(--c-bg);
}

.pending-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-xl);
    box-shadow: var(--sh-md);
    padding: var(--sp-10) var(--sp-8);
    text-align: center;
    max-width: 560px;
    width: 100%;
    animation: auth-slide-up 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.pending-card__icon {
    width: 76px;
    height: 76px;
    margin: 0 auto var(--sp-6);
    border-radius: var(--r-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--c-warning-light);
    color: var(--c-warning);
    animation: pulse 2.5s ease-in-out infinite;
}

.pending-card__icon svg {
    width: 36px;
    height: 36px;
    stroke-width: 1.75;
}

.pending-card__icon--success {
    background-color: var(--c-success-light);
    color: var(--c-success);
    animation: none;
}

.pending-card__icon--error {
    background-color: var(--c-error-light);
    color: var(--c-error);
    animation: none;
}

.pending-card__title {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    color: var(--c-text);
    margin-bottom: var(--sp-3);
    letter-spacing: -0.02em;
}

.pending-card__text {
    font-size: var(--fs-base);
    color: var(--c-text-secondary);
    line-height: var(--lh-relaxed);
    margin-bottom: var(--sp-8);
}

.pending-card__steps {
    text-align: start;
    background-color: var(--c-surface-alt);
    border: 1px solid var(--c-border-soft);
    border-radius: var(--r-lg);
    padding: var(--sp-5);
    margin-bottom: var(--sp-8);
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.pending-step {
    display: flex;
    align-items: flex-start;
    gap: var(--sp-4);
    padding: var(--sp-3);
    border-radius: var(--r-md);
    transition: background-color var(--t-fast);
}

.pending-step.is-done { background-color: var(--c-success-light); }
.pending-step.is-current { background-color: var(--c-primary-light); }

.pending-step__number {
    width: 28px;
    height: 28px;
    border-radius: var(--r-full);
    background-color: var(--c-slate-200);
    color: var(--c-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    font-family: var(--font-en);
    flex-shrink: 0;
}

.pending-step__number svg {
    width: 14px;
    height: 14px;
}

.pending-step.is-done .pending-step__number {
    background-color: var(--c-success);
    color: var(--c-text-inverse);
}

.pending-step.is-current .pending-step__number {
    background-color: var(--c-primary);
    color: var(--c-text-inverse);
}

.pending-step__text strong {
    display: block;
    color: var(--c-text);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    margin-bottom: 2px;
}

.pending-step__text span {
    color: var(--c-text-tertiary);
    font-size: var(--fs-xs);
    line-height: var(--lh-relaxed);
}

.pending-card__actions {
    display: flex;
    gap: var(--sp-3);
    justify-content: center;
    flex-wrap: wrap;
}

.pending-card__note {
    margin-top: var(--sp-6);
    font-size: var(--fs-xs);
    color: var(--c-text-tertiary);
    line-height: var(--lh-relaxed);
}

/* =====================================================
   Responsive
   ===================================================== */

@media (max-width: 640px) {
    .auth-layout {
        padding: var(--sp-4) var(--sp-3);
        align-items: flex-start;
    }

    .auth-container {
        padding: var(--sp-8) var(--sp-5);
        border-radius: var(--r-lg);
        margin-top: var(--sp-4);
    }

    .auth-header__title {
        font-size: 22px;
    }

    .auth-header__logo-mark {
        width: 48px;
        height: 48px;
    }

    .form-input {
        height: 48px;
        font-size: var(--fs-base);
    }

    .auth-nav .btn {
        height: 50px;
        font-size: var(--fs-base);
    }

    .pending-card {
        padding: var(--sp-8) var(--sp-5);
    }

    .pending-card__title {
        font-size: var(--fs-xl);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .auth-container,
    .auth-step-content.is-active,
    .pending-card {
        animation: none !important;
    }
}