/* ============================================
   BUSINESS EXPENSE MANAGER - AUTH PAGES THEME
   Modern, Professional, and Responsive Design
   ============================================ */

/* === CSS Variables === */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --danger-gradient: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --success-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border-color: #e5e7eb;
    --bg-light: #f9fafb;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Main Login Page Container === */
.login-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

/* Animated Background Pattern */
.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 50%),
        radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 30px 30px;
    animation: backgroundFloat 30s ease-in-out infinite;
    pointer-events: none;
}

/* Floating Orbs */
.login-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
    border-radius: 50%;
    top: -100px;
    right: -100px;
    animation: orbFloat 15s ease-in-out infinite;
    pointer-events: none;
}

@keyframes backgroundFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(10px, 10px) rotate(1deg); }
    50% { transform: translate(0, 20px) rotate(0deg); }
    75% { transform: translate(-10px, 10px) rotate(-1deg); }
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.5; }
    50% { transform: translate(-30px, 30px) scale(1.1); opacity: 0.3; }
}

/* === Login Card === */
.login-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    overflow: hidden;
    max-width: 460px;
    width: 100%;
    position: relative;
    z-index: 1;
    animation: cardSlideIn 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* === Login Header === */
.login-header {
    background: var(--primary-gradient);
    padding: 2.5rem 2rem 2rem;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

/* Header shimmer effect */
.login-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: headerShimmer 3s ease-in-out infinite;
}

@keyframes headerShimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Curved bottom edge */
.login-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 35px;
    background: var(--white);
    border-radius: 50% 50% 0 0 / 100% 100% 0 0;
}

/* Logo Icon */
.login-logo {
    width: 90px;
    height: 90px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    backdrop-filter: blur(10px);
    border: 3px solid rgba(255, 255, 255, 0.25);
    position: relative;
    animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(255,255,255,0.4); }
    50% { transform: scale(1.02); box-shadow: 0 0 20px 5px rgba(255,255,255,0.2); }
}

.login-logo i {
    font-size: 2.75rem;
    color: var(--white);
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.login-header h1 {
    font-size: 1.875rem;
    font-weight: 800;
    margin: 0 0 0.5rem;
    color: var(--white);
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.login-header p {
    font-size: 1rem;
    opacity: 0.9;
    margin: 0;
    font-weight: 400;
}

/* === Login Body === */
.login-body {
    padding: 2rem 2rem 2.5rem;
}

/* === Form Styling === */
.login-form .form-group {
    margin-bottom: 1.5rem;
    animation: formFieldFadeIn 0.5s ease-out backwards;
}

.login-form .form-group:nth-child(1) { animation-delay: 0.1s; }
.login-form .form-group:nth-child(2) { animation-delay: 0.2s; }
.login-form .form-group:nth-child(3) { animation-delay: 0.3s; }
.login-form .form-group:nth-child(4) { animation-delay: 0.4s; }

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

.login-form .form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.75px;
    display: block;
}

.login-form .form-control {
    padding: 0.9375rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--bg-light);
    width: 100%;
}

.login-form .form-control:hover {
    border-color: #d1d5db;
}

.login-form .form-control:focus {
    border-color: var(--primary-color);
    background-color: var(--white);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
    outline: none;
}

.login-form .form-control::placeholder {
    color: var(--text-muted);
}

/* Input Group with Icons */
.login-form .input-group {
    position: relative;
    display: flex;
    align-items: stretch;
}

.login-form .input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.125rem;
    z-index: 2;
    transition: var(--transition);
    pointer-events: none;
}

.login-form .input-group .form-control {
    padding-left: 3rem;
}

.login-form .input-group:focus-within .input-icon {
    color: var(--primary-color);
}

/* Password Toggle Button */
.password-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    z-index: 2;
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

.password-toggle:hover {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

/* Remember Me Checkbox */
.login-form .remember-me {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.login-form .remember-me input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* Primary Button */
.btn-login {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.35);
}

.btn-login:hover::before {
    left: 100%;
}

.btn-login:active {
    transform: translateY(0);
}

/* Danger variant button */
.btn-login.btn-danger {
    background: var(--danger-gradient);
}

.btn-login.btn-danger:hover {
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.35);
}

/* Success variant button */
.btn-login.btn-success {
    background: var(--success-gradient);
}

.btn-login.btn-success:hover {
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.35);
}

/* Forgot Password Link */
.forgot-password {
    text-align: right;
    margin-bottom: 1.5rem;
}

.forgot-password a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.forgot-password a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Register/Login Link */
.register-link {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.register-link p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

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

.register-link a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* === Divider === */
.login-divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.login-divider span {
    padding: 0 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* === Alert Messages === */
.login-body .alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    border: none;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    animation: alertSlideIn 0.4s ease-out;
}

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

.login-body .alert i {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.login-body .alert-success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
}

.login-body .alert-danger {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
}

.login-body .alert-warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
}

.login-body .alert-info {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1e40af;
}

/* === Validation Errors === */
.text-danger {
    color: #dc2626 !important;
    font-size: 0.8125rem;
    margin-top: 0.375rem;
    display: block;
}

.validation-summary-errors {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.validation-summary-errors ul {
    margin: 0;
    padding-left: 1.25rem;
}

/* === Footer === */
.login-footer {
    text-align: center;
    padding: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1;
}

.login-footer a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.login-footer a:hover {
    text-decoration: underline;
}

/* === Access Denied Page === */
.login-header.access-denied {
    background: var(--danger-gradient);
}

.login-header.access-denied::before {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

/* === Password Requirements === */
.password-requirements {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-top: 0.75rem;
}

.password-requirements h6 {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.password-requirements ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.password-requirements li {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    padding: 0.25rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.password-requirements li i {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.password-requirements li.valid i {
    color: #10b981;
}

/* === Loading State === */
.btn-login.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-login.loading::after {
    content: '';
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid transparent;
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 0.5rem;
}

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

/* === Secondary Button === */
.btn-secondary-auth {
    width: 100%;
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    margin-top: 0.75rem;
}

.btn-secondary-auth:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

/* === Responsive Design === */
@media (max-width: 576px) {
    .login-page {
        padding: 1rem;
        padding-bottom: 4rem;
        justify-content: flex-start;
        padding-top: 1.5rem;
    }
    
    .login-card {
        width: 100%;
        max-width: 100%;
        border-radius: var(--radius-lg);
    }
    
    .login-header {
        padding: 2rem 1.5rem 1.5rem;
    }
    
    .login-header::after {
        height: 25px;
    }
    
    .login-logo {
        width: 80px;
        height: 80px;
    }
    
    .login-logo i {
        font-size: 2.5rem;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
    
    .login-header p {
        font-size: 0.9rem;
    }
    
    .login-body {
        padding: 1.5rem;
    }
    
    .login-form .form-group {
        margin-bottom: 1.25rem;
    }
    
    .login-form .form-label {
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
    }
    
    .login-form .form-control {
        padding: 1rem 1rem;
        font-size: 1rem;
        min-height: 52px;
    }
    
    .login-form .input-group .form-control {
        padding-left: 3rem;
    }
    
    .login-form .input-icon {
        font-size: 1.25rem;
        left: 1rem;
    }
    
    .btn-login {
        padding: 1rem 1rem;
        font-size: 1rem;
        min-height: 52px;
    }
    
    .login-footer {
        position: fixed;
        padding: 1rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 360px) {
    .login-page {
        padding: 0.75rem;
        padding-bottom: 3.5rem;
    }
    
    .login-header {
        padding: 1.5rem 1.25rem 1.25rem;
    }
    
    .login-header h1 {
        font-size: 1.35rem;
    }
    
    .login-logo {
        width: 70px;
        height: 70px;
    }
    
    .login-logo i {
        font-size: 2rem;
    }
    
    .login-body {
        padding: 1.25rem;
    }
}

/* === Dark Mode Support (Optional) === */
@media (prefers-color-scheme: dark) {
    /* Can be enabled if needed */
}

/* === Print Styles === */
@media print {
    .login-page {
        background: var(--white);
    }
    
    .login-page::before,
    .login-page::after {
        display: none;
    }
    
    .login-card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
.login-form .form-control:focus-visible,
.btn-login:focus-visible,
.password-toggle:focus-visible {
    outline: 3px solid rgba(102, 126, 234, 0.5);
    outline-offset: 2px;
}

/* === Additional Utility Classes === */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted) !important; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.d-block { display: block; }
.d-grid { display: grid; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }