/* ==========================================================================
   AUTHENTICATION PAGES STYLESHEET
   Nexus Dashboard

   Styles for login page and authentication-related components.
   Uses design tokens from main.css
   ========================================================================== */


/* ==========================================================================
   1. AUTH PAGE LAYOUT
   ========================================================================== */

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    overflow: hidden;
    position: relative;
}


/* ==========================================================================
   2. ANIMATED BACKGROUND
   ========================================================================== */

.auth-background {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

/* Canvas for particle animation */
#data-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

/* Gradient overlay - matches body::before from main.css but more prominent */
.auth-gradient-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(239, 68, 68, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(6, 182, 212, 0.04) 0%, transparent 40%);
}

/* Subtle grid overlay for tech feel */
.auth-grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
}


/* ==========================================================================
   3. AUTH CONTAINER
   ========================================================================== */

.auth-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-lg);
    width: 100%;
    max-width: 480px;
}


/* ==========================================================================
   4. LOGIN CARD - GLASSMORPHISM
   ========================================================================== */

.login-card {
    width: 100%;
    background: rgba(18, 21, 28, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    box-shadow:
        var(--shadow-lg),
        0 0 60px rgba(239, 68, 68, 0.08),
        0 0 100px rgba(59, 130, 246, 0.04);
    animation: loginCardFadeIn 0.6s var(--easing-standard) forwards;
    opacity: 0;
}

@keyframes loginCardFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Card sections */
.login-card__header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.login-card__body {
    margin-bottom: var(--space-lg);
}

.login-card__footer {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-subtle);
}


/* ==========================================================================
   5. LOGIN BRAND - ANIMATED
   ========================================================================== */

.login-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.login-brand__drop {
    height: 80px;
    width: auto;
    object-fit: contain;
    animation: dropFadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.login-brand__text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.login-brand__name {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.05em;
    line-height: 1;
    opacity: 0;
    animation: textSlideIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

.login-brand__tagline {
    font-size: 1rem;
    color: var(--text-muted);
    margin-top: 4px;
    opacity: 0;
    animation: textSlideIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
}

/* Animation: Drop fades in and scales up slightly */
@keyframes dropFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(5px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* Animation: Text slides in gently from left */
@keyframes textSlideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}


/* ==========================================================================
   6. LOGIN CONTENT
   ========================================================================== */

.login-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--space-xs);
}

.login-subtitle {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--space-xl);
}

/* Error message */
.login-error {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    color: var(--accent-danger);
    font-size: 0.875rem;
}

.login-error__icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}


/* ==========================================================================
   7. MICROSOFT SSO BUTTON
   ========================================================================== */

.microsoft-sso-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

/* Gradient shine effect */
.microsoft-sso-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
        rgba(239, 68, 68, 0.1) 0%,
        transparent 50%,
        rgba(59, 130, 246, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.microsoft-sso-btn:hover {
    border-color: var(--accent-primary);
    box-shadow:
        0 0 20px rgba(239, 68, 68, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
}

.microsoft-sso-btn:hover::before {
    opacity: 1;
}

.microsoft-sso-btn:active {
    transform: translateY(0);
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.15);
}

/* Microsoft icon */
.microsoft-sso-btn__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.microsoft-sso-btn__text {
    position: relative;
}

/* Loading spinner */
.microsoft-sso-btn__spinner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.microsoft-sso-btn.loading {
    pointer-events: none;
    opacity: 0.8;
}

.microsoft-sso-btn.loading .microsoft-sso-btn__icon,
.microsoft-sso-btn.loading .microsoft-sso-btn__text {
    opacity: 0;
}

.microsoft-sso-btn.loading .microsoft-sso-btn__spinner {
    display: block;
}

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


/* ==========================================================================
   8. DIVIDER
   ========================================================================== */

.login-divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0 0 0;
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.login-divider span {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}


/* ==========================================================================
   9. FOOTER ELEMENTS
   ========================================================================== */

.login-security-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.login-security-badge__icon {
    width: 16px;
    height: 16px;
    color: var(--color-positive);
}

.login-footer-info {
    margin-top: var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    color: var(--text-muted);
    font-size: 0.75rem;
    opacity: 0;
    animation: fadeInUp 0.4s var(--easing-standard) 0.3s forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-footer-separator {
    opacity: 0.5;
}


/* ==========================================================================
   10. RESPONSIVE
   ========================================================================== */

@media (max-width: 480px) {
    .auth-container {
        padding: var(--space-md);
    }

    .login-card {
        padding: var(--space-lg);
    }

    .login-brand__drop {
        height: 60px;
    }

    .login-brand__name {
        font-size: 2.5rem;
    }

    .login-brand__tagline {
        font-size: 0.875rem;
    }

    .login-title {
        font-size: 1.5rem;
    }

    .microsoft-sso-btn {
        padding: var(--space-md);
    }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .login-card,
    .login-footer-info {
        animation: none;
        opacity: 1;
    }

    .login-brand__drop {
        animation: none;
    }

    .login-brand__name,
    .login-brand__tagline {
        animation: none;
        opacity: 1;
    }

    .microsoft-sso-btn__spinner {
        animation: none;
    }
}