/**
 * GTAH Ingénieurs Conseils - Styles principaux
 * Design moderne et professionnel
 */

/* ========================================
   Variables CSS
   ======================================== */
:root {
    /* Couleurs primaires */
    --primary-color: #0AAB59;
    --primary-dark: #088a47;
    --primary-light: #2ed573;
    
    /* Couleurs secondaires */
    --secondary-color: #f97316;
    --secondary-dark: #ea580c;
    --secondary-light: #fb923c;
    
    /* Couleurs neutres */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Autres couleurs */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Typographie */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Montserrat', var(--font-primary);
    
    /* Espacements */
    --section-padding: 80px;
    --container-padding: 15px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: #fff;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--secondary-color);
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   Utilitaires
   ======================================== */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-light { background-color: var(--gray-50) !important; }

.section-padding {
    padding: var(--section-padding) 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.25rem;
    color: var(--gray-900);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
    border-radius: 2px;
}

.section-title p {
    color: var(--gray-500);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Boutons
   ======================================== */
.btn {
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: #fff;
}

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-outline-light {
    background-color: transparent;
    border-color: #fff;
    color: #fff;
}

.btn-outline-light:hover {
    background-color: #fff;
    color: var(--primary-color);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    padding: 1rem 0;
    transition: all var(--transition-normal);
    background: transparent;
}

.navbar:not(.scrolled) {
    background: rgba(255, 255, 255, 0.95);
}

.navbar.scrolled {
    background: #fff;
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.navbar-brand img {
    height: 50px;
    transition: height var(--transition-normal);
}

.navbar.scrolled .navbar-brand img {
    height: 40px;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: var(--gray-700);
    padding: 0.5rem 1rem;
    position: relative;
    transition: color var(--transition-fast);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-color);
}

.navbar-nav .nav-link:not(.dropdown-toggle)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:not(.dropdown-toggle):hover::after,
.navbar-nav .nav-link:not(.dropdown-toggle).active::after {
    width: 80%;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* Dropdown Menu */
.navbar .dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    min-width: 200px;
}

.navbar .dropdown-item {
    padding: 0.6rem 1.2rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: all var(--transition-fast);
}

.navbar .dropdown-item:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.navbar .dropdown-item i {
    color: var(--primary-color);
    width: 20px;
}

.navbar .dropdown-toggle::after {
    margin-left: 0.3rem;
    vertical-align: middle;
}

/* Top bar */
.top-bar {
    background: var(--primary-color);
    color: #fff;
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

.top-bar a {
    color: rgba(255, 255, 255, 0.9);
}

.top-bar a:hover {
    color: #fff;
}

.top-bar i {
    margin-right: 0.5rem;
    color: var(--secondary-color);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 70vh;
    padding: 120px 0 80px;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    overflow: hidden;
}

.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease;
}

.hero-slide.active {
    opacity: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 171, 89, 0.9) 0%, rgba(8, 138, 71, 0.85) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    color: #fff;
    max-width: 700px;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-content h1 span {
    color: var(--secondary-color);
}

.hero-content p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-stat {
    text-align: center;
}

.hero-stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-color);
    line-height: 1;
}

.hero-stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.scroll-indicator a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #fff;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.scroll-indicator a:hover {
    opacity: 1;
}

.scroll-indicator .mouse {
    width: 26px;
    height: 40px;
    border: 2px solid #fff;
    border-radius: 13px;
    position: relative;
}

.scroll-indicator .wheel {
    width: 4px;
    height: 8px;
    background: #fff;
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; top: 8px; }
    100% { opacity: 0; top: 20px; }
}

/* ========================================
   About Section
   ======================================== */
.about-section {
    background: #fff;
}

.about-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-experience {
    position: absolute;
    bottom: 30px;
    right: -30px;
    background: var(--secondary-color);
    color: #fff;
    padding: 1.5rem 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.about-experience-number {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
}

.about-experience-text {
    font-size: 0.875rem;
    opacity: 0.9;
}

.about-content h2 {
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
}

.about-content .lead {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.about-feature i {
    color: var(--secondary-color);
    font-size: 1.25rem;
}

/* ========================================
   Services Section
   ======================================== */
.services-section {
    background: var(--gray-50);
}

.service-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 2rem;
    height: 100%;
    transition: all var(--transition-normal);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--secondary-color);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

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

.service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: all var(--transition-normal);
}

.service-icon i {
    font-size: 1.75rem;
    color: #fff;
}

.service-card:hover .service-icon {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
    transform: rotateY(180deg);
}

.service-card h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--gray-500);
    margin-bottom: 1.5rem;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.service-link:hover {
    color: var(--secondary-color);
}

.service-link i {
    transition: transform var(--transition-fast);
}

.service-link:hover i {
    transform: translateX(5px);
}

/* ========================================
   Projects Section
   ======================================== */
.projects-section {
    background: #fff;
}

.project-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.project-filter {
    padding: 0.5rem 1.25rem;
    border: 2px solid var(--gray-200);
    border-radius: 50px;
    background: transparent;
    color: var(--gray-600);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.project-filter:hover,
.project-filter.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.project-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    height: 100%;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(30, 58, 138, 0.9) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    display: flex;
    align-items: flex-end;
    padding: 1.5rem;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-overlay-content {
    color: #fff;
}

.project-category {
    display: inline-block;
    background: var(--secondary-color);
    color: #fff;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.project-content {
    padding: 1.5rem;
    background: #fff;
}

.project-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--gray-500);
}

.project-meta span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.project-meta i {
    color: var(--secondary-color);
}

/* ========================================
   Stats Section
   ======================================== */
.stats-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 60px 0;
}

.stat-item {
    text-align: center;
    padding: 2rem;
}

.stat-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.stat-icon i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background: var(--secondary-color);
    color: #fff;
    padding: 60px 0;
}

.cta-content {
    text-align: center;
}

.cta-content h2 {
    color: #fff;
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
    background: var(--gray-50);
}

.contact-info-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 2rem;
    height: 100%;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
}

.contact-info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-info-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.contact-info-icon i {
    font-size: 1.5rem;
    color: #fff;
}

.contact-info-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.contact-info-card p {
    color: var(--gray-500);
    margin-bottom: 0;
}

.contact-form {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    margin-bottom: 1.5rem;
}

.form-control {
    padding: 0.875rem 1rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--gray-900);
    color: #fff;
    padding-top: 60px;
}

.footer-content {
    padding-bottom: 40px;
}

.footer-brand {
    margin-bottom: 1.5rem;
}

.footer-brand img {
    height: 50px;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--gray-400);
    line-height: 1.8;
}

.footer h5 {
    color: #fff;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.footer h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--secondary-color);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--gray-400);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-links a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.footer-links a i {
    font-size: 0.75rem;
}

.footer-contact li {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--gray-400);
}

.footer-contact i {
    color: var(--secondary-color);
    width: 20px;
    margin-top: 4px;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    background: rgba(0, 0, 0, 0.2);
    padding: 1.25rem 0;
    text-align: center;
}

.footer-bottom p {
    color: var(--gray-500);
    margin: 0;
    font-size: 0.875rem;
}

/* ========================================
   Page Header
   ======================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 120px 0 60px;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="rgba(255,255,255,0.03)"/></svg>');
    background-size: 100px;
}

.page-header h1 {
    color: #fff;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.breadcrumb {
    background: transparent;
    padding: 0;
    margin: 0;
}

.breadcrumb-item a {
    color: rgba(255, 255, 255, 0.7);
}

.breadcrumb-item a:hover {
    color: #fff;
}

.breadcrumb-item.active {
    color: var(--secondary-color);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: rgba(255, 255, 255, 0.5);
}

/* ========================================
   Cards génériques
   ======================================== */
.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
}

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

.card-header {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* ========================================
   Tables
   ======================================== */
.table {
    margin-bottom: 0;
}

.table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-200);
}

.table td {
    vertical-align: middle;
}

/* ========================================
   Badges
   ======================================== */
.badge {
    padding: 0.35rem 0.75rem;
    font-weight: 500;
    border-radius: 50px;
}

.badge-primary {
    background: var(--primary-color);
}

.badge-secondary {
    background: var(--secondary-color);
}

.badge-success {
    background: var(--success-color);
}

.badge-warning {
    background: var(--warning-color);
}

.badge-danger {
    background: var(--danger-color);
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

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

.slide-up {
    animation: slideUp 0.5s ease forwards;
}

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

/* ========================================
   Loading
   ======================================== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1199.98px) {
    .hero-content h1 {
        font-size: 3rem;
    }
    
    .hero-stats {
        gap: 2rem;
    }
}

@media (max-width: 991.98px) {
    :root {
        --section-padding: 60px;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 1.5rem;
    }
    
    .hero-stat {
        flex: 1 1 calc(50% - 1rem);
    }
    
    .about-experience {
        right: 20px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
}

@media (max-width: 767.98px) {
    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        margin-top: 2rem;
        padding-top: 1.5rem;
    }
    
    .hero-stat-number {
        font-size: 2rem;
    }
    
    .section-title h2 {
        font-size: 1.75rem;
    }
    
    .about-image {
        margin-bottom: 2rem;
    }
    
    .about-experience {
        position: relative;
        right: 0;
        bottom: 0;
        display: inline-block;
        margin-top: 1rem;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .project-filters {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }
    
    .project-filter {
        white-space: nowrap;
    }
    
    .footer-content {
        text-align: center;
    }
    
    .footer h5::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .top-bar {
        display: none;
    }
}

@media (max-width: 575.98px) {
    .btn {
        padding: 0.625rem 1.25rem;
    }
    
    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
    
    .page-header {
        padding: 100px 0 40px;
    }
    
    .page-header h1 {
        font-size: 1.75rem;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .navbar,
    .footer,
    .btn,
    .scroll-indicator {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .section-padding {
        padding: 2rem 0;
    }
}