/* =============================================================================
   TPH TRAINING HUB - AUTHENTICATION PAGE
   Professional, modern design with enhanced UX
   ============================================================================= */

/* =============================================================================
   BASE LAYOUT
   ============================================================================= */

body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-4);
    background: var(--gradient-brand-primary);
    position: relative;
    overflow: hidden;
}

/* =============================================================================
   THEME TOGGLE
   ============================================================================= */

.theme-toggle {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    z-index: 10;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
    border-color: var(--color-brand-primary);
    background: var(--color-surface-primary);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    position: absolute;
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.theme-icon-light {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.theme-icon-dark {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

body.dark-mode .theme-icon-light {
    opacity: 0;
    transform: rotate(-180deg) scale(0);
}

body.dark-mode .theme-icon-dark {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* =============================================================================
   LOADING OVERLAY
   ============================================================================= */

.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-maximum);
    opacity: 1;
    transition: opacity var(--transition-slow);
    pointer-events: all;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    animation: fadeInUp 0.6s var(--ease-out);
}

.loading-spinner {
    width: 56px;
    height: 56px;
    border: 4px solid var(--color-border-primary);
    border-top-color: var(--color-brand-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-4);
}

.loading-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
}

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

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

/* =============================================================================
   MAIN CONTAINER
   ============================================================================= */

.auth-container {
    width: 100%;
    max-width: 460px;
    position: relative;
    z-index: 10;
    animation: slideInScale 0.6s var(--ease-out);
}

@keyframes slideInScale {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* =============================================================================
   ANIMATED BACKGROUND
   ============================================================================= */

.auth-background {
    position: fixed;
    inset: 0;
    z-index: 1;
    overflow: hidden;
    pointer-events: none;
}

.bg-orb {
    position: absolute;
    border-radius: var(--radius-full);
    filter: blur(100px);
    opacity: 0.5;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-direction: alternate;
}

.bg-orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.4) 0%, transparent 70%);
    top: -250px;
    left: -250px;
    animation: float1 20s;
}

.bg-orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.3) 0%, transparent 70%);
    bottom: -200px;
    right: -200px;
    animation: float2 25s;
}

.bg-orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.2) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: pulse 15s;
}

.bg-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

@keyframes float1 {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(50px, -50px); }
}

@keyframes float2 {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-40px, 40px); }
}

@keyframes pulse {
    0%, 100% { 
        transform: translate(-50%, -50%) scale(1); 
        opacity: 0.5; 
    }
    50% { 
        transform: translate(-50%, -50%) scale(1.15); 
        opacity: 0.3; 
    }
}

/* =============================================================================
   AUTH CARD
   ============================================================================= */

.auth-card {
    background: var(--color-surface-primary);
    border-radius: var(--radius-3xl);
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--color-border-primary);
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(20px);
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-brand-primary);
}

.auth-card::after {
    content: '';
    position: absolute;
    inset: -50%;
    background: radial-gradient(circle at 50% 0%, rgba(102, 126, 234, 0.05), transparent 50%);
    pointer-events: none;
}

/* =============================================================================
   HEADER
   ============================================================================= */

.auth-header {
    text-align: center;
    margin-bottom: var(--space-6);
    position: relative;
    z-index: 1;
}

.auth-logo-container {
    margin-bottom: var(--space-4);
    display: inline-block;
    animation: logoFadeIn 1s var(--ease-out);
}

@keyframes logoFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.auth-logo {
    max-width: 150px;
    height: auto;
    filter: drop-shadow(var(--shadow-md));
    transition: transform var(--transition-base);
}

.auth-logo:hover {
    transform: scale(1.05);
}

.auth-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--space-2);
    letter-spacing: var(--letter-spacing-tight);
    background: var(--gradient-brand-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleSlideIn 0.8s var(--ease-out) 0.2s both;
}

.auth-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    animation: subtitleSlideIn 0.8s var(--ease-out) 0.3s both;
}

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

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

/* =============================================================================
   ALERT CONTAINER
   ============================================================================= */

.alert-container {
    margin-bottom: var(--space-4);
    min-height: 0;
    overflow: hidden;
    transition: min-height var(--transition-base);
}

.alert {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    animation: alertSlideIn 0.3s var(--ease-out);
    margin-bottom: var(--space-3);
}

.alert:last-child {
    margin-bottom: 0;
}

.alert svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.alert-error {
    background: linear-gradient(135deg, var(--color-error) 0%, #c0392b 100%);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
}

.alert-success {
    background: linear-gradient(135deg, var(--color-success) 0%, #0f8676 100%);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
}

.alert-warning {
    background: linear-gradient(135deg, var(--color-warning) 0%, #d97706 100%);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
}

.alert-info {
    background: linear-gradient(135deg, var(--color-info) 0%, #2563eb 100%);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
}

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

/* =============================================================================
   FORM
   ============================================================================= */

.auth-form {
    margin-bottom: var(--space-6);
    position: relative;
    z-index: 1;
}

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

.form-label {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.label-required {
    color: var(--color-error);
}

/* =============================================================================
   INPUT WRAPPER
   ============================================================================= */

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--space-4);
    display: flex;
    align-items: center;
    color: var(--color-text-tertiary);
    pointer-events: none;
    transition: color var(--transition-fast);
    z-index: 1;
}

.input-icon svg {
    width: 18px;
    height: 18px;
}

.form-input {
    width: 100%;
    padding: var(--space-4);
    padding-left: var(--space-12);
    padding-right: var(--space-12);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-surface-secondary);
    border: 2px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
    outline: none;
    transition: all var(--transition-base);
}

.form-input::placeholder {
    color: var(--color-text-tertiary);
}

.form-input:focus {
    background: var(--color-surface-primary);
    border-color: var(--color-brand-primary);
    box-shadow: var(--shadow-focus);
}

.form-input:focus ~ .input-icon {
    color: var(--color-brand-primary);
}

.form-input:not(:placeholder-shown) {
    background: var(--color-surface-primary);
}

.form-input.error {
    border-color: var(--color-error);
    animation: shake 0.4s var(--ease-out);
}

.form-input.error:focus {
    box-shadow: var(--shadow-focus-error);
}

.form-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--color-surface-hover);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

/* Input Actions */
.input-clear,
.input-toggle {
    position: absolute;
    right: var(--space-4);
    display: none;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-base);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 1;
}

.input-clear.visible,
.input-toggle {
    display: flex;
}

.input-clear:hover,
.input-toggle:hover {
    background: var(--color-surface-hover);
    color: var(--color-brand-primary);
}

.input-clear:active,
.input-toggle:active {
    transform: scale(0.95);
}

.input-clear svg,
.input-toggle svg {
    width: 18px;
    height: 18px;
}

/* =============================================================================
   FORM ERROR
   ============================================================================= */

.form-error {
    display: none;
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: var(--space-2);
    font-weight: var(--font-weight-medium);
    animation: errorSlideIn 0.3s var(--ease-out);
}

.form-error.visible {
    display: block;
}

@keyframes errorSlideIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =============================================================================
   PASSWORD STRENGTH INDICATOR
   ============================================================================= */

.password-strength {
    margin-top: var(--space-3);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.password-strength.visible {
    opacity: 1;
}

.strength-bar {
    width: 100%;
    height: 4px;
    background: var(--color-surface-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-2);
}

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

.strength-fill.weak {
    width: 33%;
    background: var(--color-error);
}

.strength-fill.medium {
    width: 66%;
    background: var(--color-warning);
}

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

.strength-text {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-tertiary);
}

/* =============================================================================
   FORM OPTIONS
   ============================================================================= */

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    user-select: none;
}

.checkbox-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.checkbox-box {
    position: relative;
    width: 20px;
    height: 20px;
    background: var(--color-surface-secondary);
    border: 2px solid var(--color-border-primary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.checkbox-box::after {
    content: '';
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid var(--color-text-inverse);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-input:checked ~ .checkbox-box {
    background: var(--gradient-brand-primary);
    border-color: var(--color-brand-primary);
}

.checkbox-input:checked ~ .checkbox-box::after {
    display: block;
}

.checkbox-wrapper:hover .checkbox-box {
    border-color: var(--color-brand-primary);
}

.checkbox-input:focus-visible ~ .checkbox-box {
    box-shadow: var(--shadow-focus);
}

.checkbox-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.options-badge {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--color-brand-primary-subtle);
    border-radius: var(--radius-base);
    font-size: var(--font-size-xs);
    color: var(--color-brand-primary);
    font-weight: var(--font-weight-semibold);
}

.options-badge svg {
    width: 14px;
    height: 14px;
}

/* =============================================================================
   SUBMIT BUTTON
   ============================================================================= */

.btn-submit {
    width: 100%;
    padding: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-inverse);
    background: var(--gradient-brand-primary);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-submit::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%
    );
    transform: translateX(-100%);
    transition: transform var(--transition-base);
}

.btn-submit:hover:not(:disabled)::before {
    transform: translateX(100%);
}

.btn-submit:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-submit:active:not(:disabled) {
    transform: translateY(0);
}

.btn-submit:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-text,
.btn-icon {
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-loader {
    position: absolute;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn-submit.loading .btn-text,
.btn-submit.loading .btn-icon {
    opacity: 0;
}

.btn-submit.loading .btn-loader {
    opacity: 1;
}

.btn-spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-text-inverse);
    border-radius: var(--radius-full);
    animation: spin 0.6s linear infinite;
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

/* =============================================================================
   FOOTER
   ============================================================================= */

.auth-footer {
    text-align: center;
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border-primary);
    position: relative;
    z-index: 1;
}

.footer-divider {
    height: 1px;
    background: var(--color-border-primary);
    margin-bottom: var(--space-4);
}

.footer-security {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
}

.footer-security svg {
    width: 14px;
    height: 14px;
}

.footer-copyright {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-normal);
}

/* =============================================================================
   TRUST INDICATORS
   ============================================================================= */

/* Removed - trust indicators moved to save space */

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */

@media (max-width: 768px) {
    .theme-toggle {
        width: 36px;
        height: 36px;
    }
    
    .theme-icon {
        width: 16px;
        height: 16px;
    }
    
    .auth-card {
        padding: var(--space-6);
    }
    
    .auth-title {
        font-size: var(--font-size-2xl);
    }
    
    .auth-logo {
        max-width: 130px;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--space-3);
    }
    
    .auth-card {
        padding: var(--space-5);
    }
    
    .auth-title {
        font-size: var(--font-size-xl);
    }
    
    .auth-logo {
        max-width: 120px;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
}

@media (max-height: 700px) and (min-width: 481px) {
    body {
        padding: var(--space-3);
    }
    
    .auth-card {
        padding: var(--space-5);
    }
    
    .auth-header {
        margin-bottom: var(--space-4);
    }
    
    .auth-logo {
        max-width: 110px;
    }
    
    .auth-logo-container {
        margin-bottom: var(--space-3);
    }
    
    .form-group {
        margin-bottom: var(--space-4);
    }
    
    .alert-container {
        margin-bottom: var(--space-3);
    }
    
    .auth-form {
        margin-bottom: var(--space-4);
    }
    
    .form-options {
        margin-bottom: var(--space-4);
    }
}

/* =============================================================================
   PERFORMANCE OPTIMIZATIONS
   ============================================================================= */

.auth-card,
.btn-submit,
.loading-spinner,
.bg-orb {
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* =============================================================================
   PRINT STYLES
   ============================================================================= */

@media print {
    body {
        background: white;
    }
    
    .auth-background,
    .loading-overlay,
    .theme-toggle {
        display: none;
    }
    
    .auth-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}