/* ============================================
   Auth Module - Split Screen Layout
   Neural EP Platform
   Version: 1.0
   Integrates with main style.css design system
   ============================================ */

/* ============================================
   1. Auth-Specific CSS Variables
   ============================================ */
:root {
    --auth-brand-bg: #0F172A;
    --auth-brand-bg-dark: #020617;
    --auth-brand-text: #F1F5F9;
    --auth-wave-color-1: #0EA5E9;
    --auth-wave-color-2: #22D3EE;
    --auth-wave-color-3: #38BDF8;
    --auth-wave-glow: rgba(14, 165, 233, 0.3);
}

/* ============================================
   2. Auth Page Base
   ============================================ */
.auth-page {
    min-height: 100vh;
    background-color: var(--color-bg-app);
}

.auth-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

/* ============================================
   3. Brand Panel (Left Side)
   ============================================ */
.auth-brand-panel {
    flex: 0 0 50%;
    background-color: var(--auth-brand-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .auth-brand-panel {
    background-color: var(--auth-brand-bg-dark);
}

.auth-brand-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-8);
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 500px;
}

/* Background gradient overlay */
.auth-brand-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(34, 211, 238, 0.1) 0%, transparent 50%);
    z-index: 1;
}

/* Logo */
.auth-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    color: var(--auth-brand-text);
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-8);
}

.auth-logo i {
    font-size: 2rem;
    color: var(--auth-wave-color-1);
    filter: drop-shadow(0 0 8px var(--auth-wave-glow));
}

/* Slogan */
.auth-slogan {
    text-align: center;
    position: absolute;
    bottom: var(--spacing-8);
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    max-width: 400px;
}

.slogan-title {
    color: var(--auth-brand-text);
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    line-height: 1.4;
}

.slogan-subtitle {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

/* ============================================
   4. Signal Wave Animation
   ============================================ */
.auth-signal-animation {
    width: 100%;
    max-width: 400px;
    height: 200px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.signal-wave {
    width: 100%;
    height: 100%;
}

.wave-path {
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    filter: drop-shadow(0 0 6px var(--auth-wave-glow));
}

.wave-1 {
    stroke: var(--auth-wave-color-1);
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawWave 2s ease-out forwards, wavePulse 4s ease-in-out infinite 2s;
}

.wave-2 {
    stroke: var(--auth-wave-color-2);
    opacity: 0.7;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawWave 2s ease-out 0.3s forwards, wavePulse 4s ease-in-out infinite 2.3s;
}

.wave-3 {
    stroke: var(--auth-wave-color-3);
    opacity: 0.4;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawWave 2s ease-out 0.6s forwards, wavePulse 4s ease-in-out infinite 2.6s;
}

@keyframes drawWave {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes wavePulse {
    0%, 100% {
        opacity: 0.4;
        filter: drop-shadow(0 0 4px var(--auth-wave-glow));
    }
    50% {
        opacity: 1;
        filter: drop-shadow(0 0 12px var(--auth-wave-glow));
    }
}

/* Scan line effect */
.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--auth-wave-color-1) 40%,
        var(--auth-wave-color-1) 60%,
        transparent 100%
    );
    animation: scanMove 4s ease-in-out infinite;
    opacity: 0;
    filter: blur(1px);
}

@keyframes scanMove {
    0% {
        left: 0;
        opacity: 0;
    }
    10% {
        opacity: 0.6;
    }
    90% {
        opacity: 0.6;
    }
    100% {
        left: 100%;
        opacity: 0;
    }
}

/* Grid background effect */
.auth-signal-animation::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(14, 165, 233, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(14, 165, 233, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
    pointer-events: none;
}

/* ============================================
   5. Form Panel (Right Side)
   ============================================ */
.auth-form-panel {
    flex: 0 0 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-surface);
    position: relative;
    padding: var(--spacing-8);
    min-height: 100vh;
}

.auth-form-wrapper {
    width: 100%;
    max-width: 400px;
}

/* Theme Switch (auth page) */
.auth-theme-switch {
    position: absolute;
    top: var(--spacing-6);
    right: var(--spacing-6);
}

/* ============================================
   6. Mobile Logo (shown on small screens)
   ============================================ */
.auth-mobile-logo {
    display: none;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-6);
}

.auth-mobile-logo i {
    font-size: 1.75rem;
    color: var(--color-primary);
}

.auth-mobile-logo span {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* ============================================
   7. Form Header
   ============================================ */
.auth-form-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.auth-form-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2);
}

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

/* ============================================
   8. Form Fields
   ============================================ */
.auth-form {
    width: 100%;
}

.auth-form-group {
    margin-bottom: var(--spacing-5);
}

.auth-form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2);
}

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

.auth-input-icon {
    position: absolute;
    left: var(--spacing-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    pointer-events: none;
    transition: color var(--transition-fast);
    z-index: 1;
}

.auth-input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    padding-left: 44px;
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.auth-input:hover {
    border-color: var(--color-border-strong);
}

.auth-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.auth-input:focus + .auth-input-icon,
.auth-input-wrapper:focus-within .auth-input-icon {
    color: var(--color-primary);
}

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

/* Password toggle button */
.auth-password-toggle {
    position: absolute;
    right: var(--spacing-3);
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--spacing-2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
    z-index: 1;
}

.auth-password-toggle:hover {
    color: var(--color-text-primary);
}

/* With password toggle - adjust right padding */
.auth-input.has-toggle {
    padding-right: 48px;
}

/* Two-column row for name fields */
.auth-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
}

/* ============================================
   9. Validation States
   ============================================ */
.auth-input.is-invalid {
    border-color: var(--color-error);
}

.auth-input.is-invalid:focus {
    box-shadow: 0 0 0 3px var(--color-error-bg);
}

.auth-input-wrapper.is-invalid .auth-input-icon,
.auth-form-group.has-error .auth-input-icon {
    color: var(--color-error);
}

.auth-error-message {
    display: none;
    font-size: var(--text-xs);
    color: var(--color-error);
    margin-top: var(--spacing-1);
}

.auth-form-group.has-error .auth-error-message {
    display: block;
}

.auth-form-group.has-error .auth-input {
    border-color: var(--color-error);
}

/* Valid state */
.auth-input.is-valid {
    border-color: var(--color-success);
}

.auth-input.is-valid:focus {
    box-shadow: 0 0 0 3px var(--color-success-bg);
}

/* ============================================
   10. Checkbox
   ============================================ */
.auth-checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-5);
}

.auth-checkbox {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    accent-color: var(--color-primary);
    flex-shrink: 0;
}

.auth-checkbox:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.auth-checkbox-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    line-height: 1.5;
}

.auth-checkbox-label a {
    color: var(--color-primary);
    text-decoration: none;
}

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

/* ============================================
   11. Password Strength Indicator
   ============================================ */
.auth-password-strength {
    margin-top: var(--spacing-2);
}

.auth-strength-bar {
    height: 4px;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.auth-strength-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.auth-strength-fill.weak {
    width: 25%;
    background-color: var(--color-error);
}

.auth-strength-fill.fair {
    width: 50%;
    background-color: var(--color-warning);
}

.auth-strength-fill.good {
    width: 75%;
    background-color: #22C55E;
}

.auth-strength-fill.strong {
    width: 100%;
    background-color: var(--color-success);
}

.auth-strength-text {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--spacing-1);
}

/* ============================================
   12. Submit Button
   ============================================ */
.auth-submit-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-4) var(--spacing-6);
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    font-weight: 600;
    color: white;
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: var(--spacing-6);
}

.auth-submit-btn:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
}

.auth-submit-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.auth-submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading spinner */
.auth-submit-btn .spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.auth-submit-btn.is-loading .spinner {
    display: block;
}

.auth-submit-btn.is-loading .btn-text {
    opacity: 0.7;
}

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

/* ============================================
   13. Form Footer & Links
   ============================================ */
.auth-form-footer {
    margin-top: var(--spacing-6);
    text-align: center;
}

.auth-link {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-3);
}

.auth-link a {
    color: var(--color-primary);
    font-weight: 500;
    text-decoration: none;
}

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

.auth-divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    margin: var(--spacing-6) 0;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}

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

/* ============================================
   14. Alerts / Flash Messages
   ============================================ */
.auth-alerts {
    margin-bottom: var(--spacing-6);
}

.auth-alerts .alert {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    margin-bottom: var(--spacing-2);
}

.auth-alerts .alert-danger,
.auth-alerts .alert-error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.auth-alerts .alert-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.auth-alerts .alert-warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid var(--color-warning);
}

.auth-alerts .alert-info {
    background-color: var(--color-info-bg);
    color: var(--color-info);
    border: 1px solid var(--color-info);
}

.auth-alerts .btn-close {
    background: transparent;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: var(--spacing-1);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.auth-alerts .btn-close:hover {
    opacity: 1;
}

/* ============================================
   15. Responsive: Mobile Layout
   ============================================ */
@media (max-width: 1023px) {
    .auth-brand-panel {
        display: none;
    }

    .auth-form-panel {
        flex: 1;
    }

    .auth-form-wrapper {
        max-width: 400px;
    }

    .auth-mobile-logo {
        display: flex;
    }

    .auth-theme-switch {
        top: var(--spacing-4);
        right: var(--spacing-4);
    }
}

@media (max-width: 480px) {
    .auth-form-panel {
        padding: var(--spacing-6) var(--spacing-4);
    }

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

    .auth-form-title {
        font-size: var(--text-xl);
    }
}

/* ============================================
   16. Accessibility
   ============================================ */
.auth-input:focus-visible,
.auth-submit-btn:focus-visible,
.auth-checkbox:focus-visible,
.auth-theme-switch:focus-within .theme-switch-slider,
.auth-password-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
    .wave-path,
    .scan-line,
    .auth-strength-fill,
    .spinner {
        animation: none !important;
    }

    .wave-1, .wave-2, .wave-3 {
        stroke-dashoffset: 0;
        opacity: 0.6;
    }
}

body,
body * {
    transition: background-color var(--transition-normal),
                color var(--transition-normal),
                border-color var(--transition-normal),
                box-shadow var(--transition-normal);
}