/* ===========================
   Custom CSS for Screw Calculator
   Using Bootstrap 5 as base
   =========================== */

/* Root Variables */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --sidebar-width: 300px;
    --header-height: 76px;
    --border-radius: 0.75rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --active-gradient: linear-gradient(135deg, var(--primary-color) 0%, #0b5ed7 50%, #084298 100%);
    --active-glow: 0 0 20px rgba(13, 110, 253, 0.3);
}

/* Global Styles */
html, body {
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    flex-direction: column;
    background-color: var(--light-color);
}

/* Enhanced Navigation */
.navbar {
    min-height: var(--header-height);
    box-shadow: var(--box-shadow);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    margin: 0 0.25rem;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.dropdown-menu {
    border: none;
    box-shadow: var(--box-shadow-lg);
    border-radius: var(--border-radius);
    margin-top: 0.5rem;
}

.dropdown-item {
    padding: 0.75rem 1.25rem;
    font-weight: 500;
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

/* Calculator Layout */
.calculator-layout {
    display: flex;
    min-height: calc(100vh - var(--header-height));
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

/* Sidebar Navigation - Enhanced */
.sidebar-navigation {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
    border-right: 1px solid #dee2e6;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    background: var(--active-gradient);
    color: white;
    text-align: center;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
}

.sidebar-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: shimmer 3s ease-in-out infinite;
}

.sidebar-header h5 {
    margin: 0;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.sidebar-nav {
    padding: 1.5rem 0;
}

/* Enhanced Sidebar Links */
.sidebar-link {
    display: flex;
    align-items: center;
    padding: 1.25rem 1.5rem;
    text-decoration: none;
    color: var(--dark-color);
    border: none;
    border-left: 4px solid transparent;
    transition: var(--transition);
    position: relative;
    margin: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    background: transparent;
    overflow: hidden;
}

.sidebar-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(13, 110, 253, 0.1), transparent);
    transition: var(--transition);
}

.sidebar-link:hover {
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.1), rgba(13, 110, 253, 0.05));
    color: var(--primary-color);
    text-decoration: none;
    border-left-color: var(--primary-color);
    transform: translateX(8px);
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.2);
}

.sidebar-link:hover::before {
    left: 100%;
}

/* Disabled Sidebar Links */
.sidebar-link.disabled {
    background: #f8f9fa !important;
    color: #6c757d !important;
    border-left-color: #dee2e6 !important;
    cursor: not-allowed !important;
    transform: none !important;
    box-shadow: none !important;
    opacity: 0.6 !important;
}

.sidebar-link.disabled:hover {
    background: #f8f9fa !important;
    color: #6c757d !important;
    border-left-color: #dee2e6 !important;
    transform: none !important;
    box-shadow: none !important;
    opacity: 0.6 !important;
}

.sidebar-link.disabled::before {
    display: none;
}

.sidebar-link.disabled .step-number {
    background: linear-gradient(135deg, #adb5bd, #6c757d) !important;
    color: #f8f9fa !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.sidebar-link.disabled .step-info i {
    color: #adb5bd !important;
}

.sidebar-link.disabled .step-info span {
    color: #6c757d !important;
}

/* Unlocked Animation */
.sidebar-link.unlocked {
    animation: unlockPulse 1s ease-in-out;
}

@keyframes unlockPulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(13, 110, 253, 0.7);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(13, 110, 253, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(13, 110, 253, 0);
    }
}

/* Active Sidebar Link - Super Enhanced */
.sidebar-link.active {
    background: var(--active-gradient);
    color: white;
    border-left-color: var(--warning-color);
    box-shadow: var(--active-glow), inset 0 0 20px rgba(0, 0, 0, 0.1);
    transform: translateX(12px) scale(1.02);
    margin: 0.5rem 0.5rem;
    position: relative;
    animation: activeTabPulse 2s ease-in-out infinite;
}

.sidebar-link.active::after {
    content: '';
    position: absolute;
    right: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-top: 15px solid transparent;
    border-bottom: 15px solid transparent;
    border-left: 15px solid var(--primary-color);
    filter: drop-shadow(2px 0 4px rgba(0, 0, 0, 0.2));
}

.sidebar-link.active::before {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: activeShimmer 2s ease-in-out infinite;
}

/* Enhanced Step Number */
.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), #495057);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1rem;
    margin-right: 1rem;
    transition: var(--transition);
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.step-number::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--info-color));
    z-index: -1;
    opacity: 0;
    transition: var(--transition);
}

.sidebar-link.active .step-number {
    background: linear-gradient(135deg, var(--warning-color), #ffca2c);
    color: var(--dark-color);
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(255, 193, 7, 0.4);
    animation: stepNumberPulse 2s ease-in-out infinite;
}

.sidebar-link.active .step-number::before {
    opacity: 1;
    animation: stepNumberGlow 2s ease-in-out infinite;
}

.sidebar-link:hover .step-number {
    background: linear-gradient(135deg, var(--primary-color), #0b5ed7);
    transform: scale(1.15);
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.4);
}

.sidebar-link:hover .step-number::before {
    opacity: 1;
}

/* Step Info Enhanced */
.step-info {
    display: flex;
    align-items: center;
    flex: 1;
}

.step-info i {
    margin-right: 0.75rem;
    font-size: 1.2rem;
    transition: var(--transition);
}

.sidebar-link.active .step-info i {
    animation: iconFloat 3s ease-in-out infinite;
}

.step-info span {
    font-weight: 600;
    font-size: 0.95rem;
}

/* Progress Indicator Enhanced */
.progress-indicator {
    padding: 1.5rem;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-top: 1px solid #dee2e6;
    margin-top: auto;
}

.progress-indicator .progress {
    height: 8px;
    border-radius: 10px;
    background: rgba(13, 110, 253, 0.1);
    overflow: hidden;
    position: relative;
}

.progress-indicator .progress-bar {
    background: var(--active-gradient);
    border-radius: 10px;
    position: relative;
    overflow: hidden;
}

.progress-indicator .progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: progressShimmer 2s ease-in-out infinite;
}

/* Completion Indicator */
.sidebar-link.completed {
    position: relative;
}

.sidebar-link.completed .step-number::after {
    content: '\f00c';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    top: -5px;
    right: -5px;
    width: 18px;
    height: 18px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(25, 135, 84, 0.4);
}

/* Tab Status Indicators */
.sidebar-link.pending .step-number {
    background: linear-gradient(135deg, #6c757d, #495057);
}

.sidebar-link.in-progress .step-number {
    background: linear-gradient(135deg, var(--warning-color), #ffca2c);
    color: var(--dark-color);
}

.sidebar-link.completed .step-number {
    background: linear-gradient(135deg, var(--success-color), #146c43);
}

.sidebar-link.error .step-number {
    background: linear-gradient(135deg, var(--danger-color), #b02a37);
    animation: errorShake 0.5s ease-in-out;
}

/* Main Content Area */
.main-content-area {
    flex: 1;
    background-color: white;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    margin: 1rem 1rem 1rem 0;
    box-shadow: var(--box-shadow-lg);
    overflow: hidden;
    position: relative;
}

.content-wrapper {
    padding: 2rem;
    height: 100%;
    overflow-y: auto;
}

/* Tab Content Animation */
.tab-content-wrapper {
    position: relative;
    min-height: 500px;
}

.tab-content {
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition);
}

.tab-content.active {
    opacity: 1;
    transform: translateX(0);
}

/* Material Selection Specific Styles */
.material-category-wrapper .icon-wrapper {
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--bs-primary-rgb), 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.material-category:hover .icon-wrapper {
    background: rgba(var(--bs-primary-rgb), 0.2);
    transform: scale(1.1);
}

.material-category.active {
    background: linear-gradient(135deg, var(--primary-color), #0b5ed7) !important;
    color: white !important;
    border-radius: var(--border-radius);
}

.material-category.active .icon-wrapper {
    background: rgba(255, 255, 255, 0.2);
}

.quick-material-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: 2px solid transparent !important;
}

.quick-material-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15) !important;
    border-color: var(--primary-color) !important;
}

.quick-material-card.selected {
    border-color: var(--success-color) !important;
    box-shadow: 0 8px 25px rgba(25, 135, 84, 0.2) !important;
}

.material-icon {
    transition: all 0.3s ease;
}

.quick-material-card:hover .material-icon {
    transform: scale(1.2);
}

/* Enhanced Table Styles */
.table-responsive {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.table tbody tr {
    transition: all 0.2s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05) !important;
}

.table tbody tr:hover {
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.03), rgba(13, 110, 253, 0.08));
    transform: scale(1.005);
}

.table tbody td {
    vertical-align: middle;
    border: none;
}

.table tbody td i {
    width: 20px;
    text-align: center;
}

/* Enhanced Form Controls */
.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
    transform: translateY(-1px);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    animation: errorShake 0.3s ease-in-out;
}

/* Cards and Forms */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--box-shadow-lg);
    transform: translateY(-4px);
}

.card-header {
    background: var(--active-gradient);
    color: white;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    padding: 1.25rem;
    border-bottom: none;
}

.card-header.bg-light {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef) !important;
    color: var(--dark-color) !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.card-header h4, .card-header h5, .card-header h6 {
    margin: 0;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background: rgba(0, 0, 0, 0.02);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* Form Enhancements */
.form-label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.form-control, .form-select {
    border-radius: var(--border-radius);
    border: 1px solid #ced4da;
    padding: 0.75rem;
    transition: var(--transition);
}

/* Enhanced Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::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: var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

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

.btn-primary {
    background: var(--active-gradient);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #146c43);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), #ffca2c);
    color: var(--dark-color);
}

.btn-info {
    background: linear-gradient(135deg, var(--info-color), #0aa2c0);
}

.btn-outline-primary:hover {
    background: var(--active-gradient);
    border-color: transparent;
}

.btn-outline-success:hover {
    background: linear-gradient(135deg, var(--success-color), #146c43);
    border-color: transparent;
}

.btn-outline-warning:hover {
    background: linear-gradient(135deg, var(--warning-color), #ffca2c);
    border-color: transparent;
    color: var(--dark-color);
}

.btn-outline-info:hover {
    background: linear-gradient(135deg, var(--info-color), #0aa2c0);
    border-color: transparent;
}

/* Header Gradient Enhancement */
.bg-gradient-primary {
    background: var(--active-gradient) !important;
}

/* List Group Enhancements */
.list-group-item {
    border: none;
    transition: var(--transition);
    margin-bottom: 0.25rem;
    border-radius: var(--border-radius) !important;
}

.list-group-item:hover {
    background: rgba(var(--bs-primary-rgb), 0.05);
    transform: translateX(5px);
}

.list-group-item.active {
    background: var(--active-gradient) !important;
    border-color: transparent !important;
}

/* Badge Enhancements */
.badge {
    font-weight: 500;
    padding: 0.5em 0.75em;
}

/* Tables */
.table {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.table thead th {
    background: var(--active-gradient);
    color: white;
    border: none;
    font-weight: 600;
    padding: 1rem;
}

.table tbody tr:hover {
    background-color: #f8f9fa;
    transform: scale(1.02);
    transition: var(--transition);
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    box-shadow: var(--box-shadow);
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
    color: #0c5460;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    color: #856404;
}

.alert-success {
    background: linear-gradient(135deg, #d1e7dd, #a3d9a5);
    color: #0f5132;
}

/* Progress Bars */
.progress {
    height: 1rem;
    border-radius: var(--border-radius);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    background: var(--active-gradient);
    border-radius: var(--border-radius);
}

/* Footer Enhancements */
footer {
    background: linear-gradient(135deg, var(--dark-color), #495057) !important;
}

footer h5, footer h6 {
    color: white;
}

footer .text-muted {
    color: #adb5bd !important;
}

/* Animations */
@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

@keyframes activeTabPulse {
    0%, 100% { box-shadow: var(--active-glow), inset 0 0 20px rgba(0, 0, 0, 0.1); }
    50% { box-shadow: 0 0 30px rgba(13, 110, 253, 0.5), inset 0 0 20px rgba(0, 0, 0, 0.1); }
}

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

@keyframes stepNumberPulse {
    0%, 100% { transform: scale(1.1); }
    50% { transform: scale(1.2); }
}

@keyframes stepNumberGlow {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

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

@keyframes errorShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

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

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* Loading Animations */
@keyframes loadingDots {
    0%, 20% { opacity: 0; }
    50% { opacity: 1; }
    80%, 100% { opacity: 0; }
}

.loading-dots span {
    animation: loadingDots 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 100%;
    }
    
    .calculator-layout {
        flex-direction: column;
    }
    
    .sidebar-navigation {
        width: 100%;
        height: auto;
        position: relative;
        max-height: 400px;
    }
    
    .main-content-area {
        margin: 0;
        border-radius: 0;
    }
    
    .sidebar-link {
        padding: 1rem;
        margin: 0.25rem 0.5rem;
    }
    
    .step-number {
        width: 35px;
        height: 35px;
        margin-right: 0.75rem;
        font-size: 0.9rem;
    }
    
    .sidebar-link.active {
        transform: translateX(8px) scale(1.01);
    }
    
    .quick-material-card {
        margin-bottom: 1rem;
    }
    
    .content-wrapper {
        padding: 1rem;
    }
}

@media (max-width: 576px) {
    .content-wrapper {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .sidebar-link {
        padding: 0.75rem;
    }
    
    .step-number {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
}

/* Loading Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Tooltip Customization */
.tooltip .tooltip-inner {
    background-color: var(--dark-color);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
}

/* Modal Enhancements */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
}

.modal-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-footer {
    border-top: 1px solid #dee2e6;
}

/* Utility Classes */
.text-gradient {
    background: var(--active-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: var(--active-gradient);
}

.shadow-custom {
    box-shadow: var(--box-shadow-lg);
}

.border-radius-custom {
    border-radius: var(--border-radius);
}

/* Tab Navigation Enhancements */
.tab-navigation-controls {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    padding: 1rem 0;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Modern Glass Effect */
.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Enhanced Hover States */
.hover-lift {
    transition: var(--transition);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-lg);
}

/* Smooth Reveal Animation */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}