/* ============================================
   CANVA-INSPIRED MODERN UI/UX DESIGN
   Clean, Gradient, Professional Web App
   ============================================ */

/* ===== Canva-Inspired Color Palette ===== */
:root {
    /* Primary Colors - Canva Blue/Purple Gradient */
    --canva-blue: #00c4cc;
    --canva-purple: #6c5ce7;
    --canva-gradient: linear-gradient(135deg, #00c4cc 0%, #6c5ce7 100%);
    --canva-gradient-light: linear-gradient(135deg, rgba(0, 196, 204, 0.1) 0%, rgba(108, 92, 231, 0.1) 100%);
    
    /* Neutral Colors - Clean Grays */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* Text Colors */
    --text-primary: #1a1a1a;
    --text-secondary: #525252;
    --text-tertiary: #737373;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-gradient: linear-gradient(135deg, #e0f2fe 0%, #f3e8ff 100%);
    
    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Shadows - Subtle like Canva */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius - Pill-shaped like Canva */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-pill: 9999px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Global Reset & Base Styles ===== */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
    font-weight: 400;
}

/* ===== Modern Navigation - Canva Style ===== */
.navbar {
    background: var(--bg-primary) !important;
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 0;
    box-shadow: none;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--canva-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    letter-spacing: -0.02em;
}

.navbar-brand:hover {
    opacity: 0.8;
}

.navbar-brand i {
    background: var(--canva-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.5rem;
}

.nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-pill);
    transition: var(--transition);
    font-size: 0.9375rem;
    position: relative;
}

.nav-link:hover {
    color: var(--canva-purple) !important;
    background-color: var(--gray-100);
}

.nav-link.active {
    color: var(--canva-purple) !important;
    background-color: var(--canva-gradient-light);
    font-weight: 600;
}

/* ===== Canva-Style Buttons ===== */
.btn {
    border-radius: var(--radius-pill);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: var(--canva-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
    opacity: 0.95;
}

.btn-outline-primary {
    border: 2px solid var(--canva-purple);
    color: var(--canva-purple);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--canva-purple);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-light {
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.btn-light:hover {
    background: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

.btn-success {
    background: var(--success);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    background: #059669;
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-info {
    background: var(--info);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-info:hover {
    background: #2563eb;
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-warning {
    background: var(--warning);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-warning:hover {
    background: #d97706;
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: var(--danger);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    background: #dc2626;
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--text-primary);
    border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-200);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.0625rem;
}

/* ===== Canva-Style Cards ===== */
.card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    transition: var(--transition);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.5rem;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.card-header.bg-primary {
    background: var(--canva-gradient) !important;
    color: white !important;
    border-bottom: none;
}

.card-header.bg-success {
    background: var(--success) !important;
    color: white !important;
    border-bottom: none;
}

.card-header.bg-info {
    background: var(--info) !important;
    color: white !important;
    border-bottom: none;
}

.card-header.bg-warning {
    background: var(--warning) !important;
    color: white !important;
    border-bottom: none;
}

.card-body {
    padding: 1.5rem;
}

/* ===== Stat Cards ===== */
.stat-card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--canva-gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-card:hover {
    border-color: var(--canva-purple);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: var(--canva-gradient-light);
    color: var(--canva-purple);
    margin-bottom: 1rem;
}

/* ===== Forms ===== */
.form-control,
.form-select {
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    background-color: var(--bg-primary);
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--canva-purple);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
    outline: none;
    background-color: var(--bg-primary);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    letter-spacing: -0.01em;
}

/* ===== Tables ===== */
.table {
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
}

.table thead th {
    background: var(--gray-50);
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem;
    border: none;
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr {
    transition: var(--transition);
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr:hover {
    background-color: var(--gray-50);
}

.table tbody td {
    padding: 1rem;
    vertical-align: middle;
    border: none;
    color: var(--text-primary);
}

/* ===== Badges ===== */
.badge {
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.025em;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.bg-primary {
    background: var(--canva-gradient) !important;
    color: white !important;
}

.bg-success {
    background: var(--success) !important;
    color: white !important;
}

.bg-info {
    background: var(--info) !important;
    color: white !important;
}

.bg-warning {
    background: var(--warning) !important;
    color: white !important;
}

.bg-danger {
    background: var(--danger) !important;
    color: white !important;
}

.bg-secondary {
    background: var(--gray-200) !important;
    color: var(--text-primary) !important;
}

/* ===== Alerts ===== */
.alert {
    border: 1px solid;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    border-left-width: 4px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-color: var(--success);
    border-left-color: var(--success);
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-color: var(--danger);
    border-left-color: var(--danger);
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-color: var(--info);
    border-left-color: var(--info);
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-color: var(--warning);
    border-left-color: var(--warning);
}

/* ===== Progress Bars ===== */
.progress {
    height: 0.5rem;
    border-radius: var(--radius-pill);
    background-color: var(--gray-200);
    overflow: hidden;
}

.progress-bar {
    background: var(--canva-gradient);
    border-radius: var(--radius-pill);
    transition: width 0.6s ease;
}

/* ===== Modals ===== */
.modal-content {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.modal-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.5rem;
}

.modal-title {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.modal-body {
    padding: 1.5rem;
    background: var(--bg-primary);
}

.modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: 1.25rem 1.5rem;
    background: var(--bg-secondary);
}

.btn-close {
    opacity: 0.5;
}

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

/* ===== Hero Section - Canva Style ===== */
.hero-section {
    background: var(--bg-gradient);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="60" height="60" patternUnits="userSpaceOnUse"><path d="M 60 0 L 0 0 0 60" fill="none" stroke="rgba(108,92,231,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 1;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

/* ===== Feature Cards ===== */
.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--canva-gradient-light);
    color: var(--canva-purple);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.75rem;
    transition: var(--transition);
}

.card:hover .feature-icon {
    transform: scale(1.1);
    background: var(--canva-gradient);
    color: white;
}

/* ===== Step Numbers ===== */
.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--canva-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
    box-shadow: var(--shadow-md);
}

/* ===== Main Content ===== */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* ===== Footer ===== */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
    border-top: 1px solid var(--gray-800);
}

.footer h5,
.footer h6 {
    color: white;
    font-weight: 700;
    margin-bottom: 1rem;
    font-size: 0.9375rem;
    letter-spacing: -0.01em;
}

.footer a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.875rem;
}

.footer a:hover {
    color: white;
}

/* ===== Quick Action Buttons ===== */
.quick-action-btn {
    border-radius: var(--radius-pill);
    padding: 0.875rem 1.5rem;
    transition: var(--transition);
    font-weight: 600;
    border: 1px solid var(--gray-200);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.quick-action-btn:hover {
    border-color: var(--canva-purple);
    background: var(--canva-gradient-light);
    color: var(--canva-purple);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== Empty States ===== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--gray-400);
    opacity: 0.5;
}

/* ===== Skill Tags ===== */
.skill-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    color: var(--text-primary);
    border-radius: var(--radius-pill);
    font-size: 0.875rem;
    font-weight: 500;
    margin: 0.25rem;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.skill-tag:hover {
    background: var(--canva-gradient-light);
    color: var(--canva-purple);
    border-color: var(--canva-purple);
}

/* ===== Typography - Canva Style ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.display-4 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.display-5 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    line-height: 1.6;
}

.text-muted {
    color: var(--text-secondary) !important;
}

/* ===== Utility Classes ===== */
.shadow-hover {
    transition: var(--transition);
}

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

.text-gradient {
    background: var(--canva-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.4s ease-out;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .card-body {
        padding: 1.25rem;
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .display-5 {
        font-size: 1.75rem;
    }
}

/* ===== Change Tracker Styles ===== */
.change-item {
    border-left: 3px solid var(--warning);
    transition: var(--transition);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--gray-200);
}

.change-item:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-300);
}

.change-item.change-accepted {
    border-left-color: var(--success);
    background-color: #d1fae5;
}

.change-item.change-rejected {
    border-left-color: var(--danger);
    background-color: #fee2e2;
    opacity: 0.7;
}

.change-item.change-pending {
    border-left-color: var(--warning);
}

/* ===== Optimization Results Layout ===== */
#optimizationResults .col-lg-8,
#optimizationResults .col-lg-4 {
    flex: 0 0 auto;
}

#optimizationResults .col-lg-8 {
    width: 66.66667%;
}

#optimizationResults .col-lg-4 {
    width: 33.33333%;
}

#optimizationResults {
    display: flex !important;
    gap: 1rem;
}

@media (max-width: 991px) {
    #optimizationResults {
        flex-direction: row !important;
    }
}

@media (max-width: 768px) {
    #optimizationResults {
        flex-direction: column !important;
    }
    
    #optimizationResults .col-lg-8,
    #optimizationResults .col-lg-4 {
        width: 100%;
        flex: none;
    }
}