/* ============================================================================
   MODERN THEME STYLES
   Component-specific styling and extended modern design patterns
   ============================================================================ */

/* ============================================================================
   HEADER & NAVIGATION
   ============================================================================ */

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    position: sticky;
    top: 0;
    z-index: 99;
}

header h1 {
    color: white;
    margin: 0;
    font-size: 1.75rem;
    font-weight: 700;
}

nav {
    background: rgba(255, 255, 255, 0.95);
    padding: 0.75rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    display: inline-block;
    transition: all 0.3s ease;
    font-weight: 500;
    border-radius: 4px;
}

nav a:hover {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

/* ============================================================================
   AUTHENTICATION CONTAINER & FORMS
   ============================================================================ */

.auth-container {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
}

.auth-form {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-6);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 420px;
    animation: slideInUp 0.5s ease-out;
}

.auth-form h1,
.auth-form h2 {
    color: var(--text-primary);
    margin: 0 0 var(--spacing-4) 0;
    text-align: center;
    font-size: 1.75rem;
}

.form-group {
    margin-bottom: var(--spacing-4);
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
    background: var(--bg-secondary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

/* Error & Success States */
.form-group.error input,
.form-group.error textarea {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.05);
}

.form-group.error input:focus,
.form-group.error textarea:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group.success input,
.form-group.success textarea {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

.form-group.success input:focus,
.form-group.success textarea:focus {
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

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

.password-strength {
    margin-top: var(--spacing-2);
}

.strength-bar {
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--spacing-2);
}

.strength-bar-fill {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    background: var(--danger-color);
}

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

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

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

.strength-text {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============================================================================
   MODAL DIALOGS
   ============================================================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
    overflow-y: auto;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 500px;
    animation: slideInUp 0.4s ease-out;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-4);
}

.modal-body form .form-group {
    margin-bottom: var(--spacing-4);
}

.modal-body form .form-group:last-child {
    margin-bottom: 0;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-2);
    padding: var(--spacing-4);
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

/* ============================================================================
   FEATURE CARDS & SECTIONS
   ============================================================================ */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-4);
    margin: var(--spacing-6) 0;
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-4);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
    border-color: var(--primary-color);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-2);
}

.feature-card h3 {
    color: var(--text-primary);
    margin: var(--spacing-2) 0;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* ============================================================================
   PROFILE CARDS
   ============================================================================ */

.profile-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-4);
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
}

.profile-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-3);
    font-size: 2rem;
    color: white;
    font-weight: 700;
}

.profile-name {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-1) 0;
}

.profile-role {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0 0 var(--spacing-3) 0;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2);
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-3);
    margin-top: var(--spacing-3);
}

.stat {
    text-align: center;
}

.stat-number {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-label {
    color: var(--text-tertiary);
    font-size: 0.75rem;
    text-transform: uppercase;
    margin-top: 4px;
}

/* ============================================================================
   STATUS INDICATORS
   ============================================================================ */

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
}

.status-indicator::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

.status-online {
    color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.status-online::before {
    background: var(--success-color);
}

.status-offline {
    color: var(--text-tertiary);
    background: var(--bg-secondary);
}

.status-offline::before {
    background: var(--text-tertiary);
    animation: none;
}

.status-busy {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.status-busy::before {
    background: var(--danger-color);
}

/* ============================================================================
   LOADING STATE
   ============================================================================ */

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-secondary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-sm {
    width: 24px;
    height: 24px;
    border-width: 2px;
}

.spinner-lg {
    width: 56px;
    height: 56px;
    border-width: 6px;
}

/* ============================================================================
   TABLES
   ============================================================================ */

.table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.table thead {
    background: var(--bg-secondary);
}

.table thead th {
    padding: var(--spacing-3);
    color: var(--text-primary);
    font-weight: 700;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background 0.3s ease;
}

.table tbody tr:hover {
    background: var(--bg-secondary);
}

.table tbody td {
    padding: var(--spacing-3);
    color: var(--text-secondary);
}

/* ============================================================================
   DARK MODE SUPPORT
   ============================================================================ */

@media (prefers-color-scheme: dark) {
    .auth-form,
    .feature-card,
    .profile-card,
    .modal-content {
        background: #1f2937;
        color: #f3f4f6;
        border-color: #374151;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        background: #111827;
        border-color: #374151;
        color: #f3f4f6;
    }

    .form-group input:focus,
    .form-group textarea:focus,
    .form-group select:focus {
        background: #1f2937;
        border-color: #667eea;
    }

    .modal-header {
        background: rgba(102, 126, 234, 0.15);
        border-color: #374151;
    }

    .modal-footer {
        background: #111827;
        border-color: #374151;
    }

    .modal-header h2,
    .form-group label {
        color: #f3f4f6;
    }

    nav {
        background: rgba(31, 41, 55, 0.95);
    }

    nav a {
        color: #d1d5db;
    }

    nav a:hover {
        color: #667eea;
        background: rgba(102, 126, 234, 0.1);
    }

    .table {
        border-color: #374151;
        background: #1f2937;
    }

    .table thead {
        background: #111827;
    }

    .table thead th {
        color: #f3f4f6;
        border-color: #374151;
    }

    .table tbody tr {
        border-color: #374151;
    }

    .table tbody tr:hover {
        background: #111827;
    }

    .table tbody td {
        color: #d1d5db;
    }
}

/* ============================================================================
   ACCESSIBILITY
   ============================================================================ */

button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

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

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

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

@media (max-width: 768px) {
    .auth-form {
        padding: var(--spacing-4);
    }

    .modal-content {
        max-width: 95vw;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .profile-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .modal-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .modal-close {
        align-self: flex-end;
        margin-top: -var(--spacing-4);
        margin-right: -var(--spacing-4);
    }

    .modal-footer {
        flex-direction: column;
    }

    .modal-footer .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.25rem;
    }

    .auth-form {
        padding: var(--spacing-3);
        max-width: 100%;
    }

    .form-group label {
        font-size: 0.8rem;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 0.625rem 0.875rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .modal-content {
        max-width: 100%;
        border-radius: 8px;
    }

    .modal-header h2 {
        font-size: 1.25rem;
    }

    .btn {
        font-size: 0.9rem;
        padding: 0.625rem 1rem;
    }

    .table {
        font-size: 0.85rem;
    }

    .table thead th,
    .table tbody td {
        padding: var(--spacing-2);
    }
}