/* ===================================
   Global Styles & Variables
   =================================== */

:root {
    /* Modern Color Palette */
    --primary-color: #16a34a;
    --primary-dark: #15803d;
    --primary-light: #86efac;
    --secondary-color: #0891b2;
    --accent-color: #eab308;
    --dark-bg: #1e293b;
    --darker-bg: #0f172a;
    --text-dark: #1e293b;
    --text-body: #475569;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-lighter: #f1f5f9;
    --border-light: #e2e8f0;
    --border-lighter: #cbd5e1;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    line-height: 1.7;
    color: var(--text-body);
    background-color: var(--bg-white);
    overflow-x: hidden;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 100px 0;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
    margin-bottom: 16px;
}

h1 {
    font-size: 56px;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 48px;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 32px;
}

h4 {
    font-size: 24px;
}

p {
    margin-bottom: 16px;
    line-height: 1.8;
}

.section-header {
    margin-bottom: 64px;
    text-align: center;
}

.section-subtitle {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 48px;
    color: var(--text-dark);
    margin-bottom: 16px;
    font-weight: 800;
}

.section-description {
    font-size: 18px;
    color: var(--text-light);
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.8;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--bg-white);
    box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border: 2px solid var(--bg-white);
}

.btn-secondary:hover {
    background: var(--bg-white);
    color: var(--primary-color);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--bg-white);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 18px;
}

.btn-block {
    width: 100%;
}

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    text-decoration: none;
}

.logo-text {
    font-size: 24px;
    font-weight: 900;
    color: var(--text-dark);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-body);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s ease;
    position: relative;
}

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

.btn-nav {
    background: var(--primary-color);
    color: var(--bg-white);
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
}

.btn-nav:hover {
    background: var(--primary-dark);
    color: var(--bg-white);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-dark);
    cursor: pointer;
}

/* ===================================
   Hero Section
   =================================== */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-3d-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: var(--text-dark);
    padding: 40px 20px;
}

.hero-title {
    font-size: 72px;
    font-weight: 900;
    margin-bottom: 24px;
    line-height: 1.1;
    color: var(--text-dark);
    letter-spacing: -0.03em;
    text-shadow: 0 2px 8px rgba(255, 255, 255, 0.8), 0 0 30px rgba(255, 255, 255, 0.5);
}

.hero-subtitle {
    font-size: 22px;
    margin-bottom: 48px;
    opacity: 1;
    line-height: 1.6;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-body);
    text-shadow: 0 1px 4px rgba(255, 255, 255, 0.6);
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 80px;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.hero-buttons .btn-secondary {
    background: transparent;
    color: var(--text-dark);
    border: 2px solid var(--text-dark);
}

.hero-buttons .btn-secondary:hover {
    background: var(--text-dark);
    color: var(--bg-white);
}

.hero-stats {
    display: flex;
    gap: 80px;
    justify-content: center;
    margin-top: 80px;
}

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

.stat-number {
    font-size: 56px;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1;
    text-shadow: 0 2px 8px rgba(255, 255, 255, 0.7);
}

.stat-label {
    font-size: 16px;
    color: var(--text-body);
    font-weight: 500;
    text-shadow: 0 1px 4px rgba(255, 255, 255, 0.6);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 28px;
    color: var(--text-dark);
    animation: bounce 2s infinite;
    z-index: 3;
    cursor: pointer;
    opacity: 0.7;
    text-shadow: 0 2px 6px rgba(255, 255, 255, 0.7);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-12px);
    }
    60% {
        transform: translateX(-50%) translateY(-6px);
    }
}

/* ===================================
   About Section
   =================================== */

.about-section {
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 80px;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    aspect-ratio: 3/4;
}

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

.about-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(22, 163, 74, 0.15), transparent);
}

.about-text {
    padding: 20px 0;
}

.about-name {
    font-size: 36px;
    margin-bottom: 12px;
    font-weight: 800;
}

.about-nickname {
    color: var(--primary-color);
    font-weight: 800;
}

.about-title {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 32px;
    font-weight: 500;
}

.about-description {
    margin-bottom: 40px;
}

.about-description p {
    margin-bottom: 20px;
    line-height: 1.9;
    font-size: 17px;
    color: var(--text-body);
}

.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 40px;
}

.info-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.info-item i {
    font-size: 24px;
    color: var(--primary-color);
    margin-top: 2px;
}

.info-item strong {
    display: block;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-dark);
    font-size: 15px;
}

.info-item p {
    color: var(--text-body);
    font-size: 15px;
    margin: 0;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tag {
    display: inline-block;
    padding: 10px 18px;
    background: var(--bg-light);
    color: var(--text-dark);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s ease;
}

.tag:hover {
    background: var(--primary-color);
    color: var(--bg-white);
    border-color: var(--primary-color);
}

/* ===================================
   Experience Section (Timeline)
   =================================== */

.experience-section {
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding-left: 60px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
}

.timeline-item {
    position: relative;
    margin-bottom: 60px;
    padding-left: 50px;
}

.timeline-marker {
    position: absolute;
    left: -35px;
    top: 4px;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border: 4px solid var(--bg-white);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--border-light);
    z-index: 2;
}

.timeline-content {
    background: var(--bg-white);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.timeline-date {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-title {
    font-size: 24px;
    margin-bottom: 8px;
    font-weight: 800;
}

.timeline-company {
    color: var(--text-light);
    font-size: 17px;
    margin-bottom: 20px;
    font-weight: 600;
}

.timeline-description {
    list-style: none;
}

.timeline-description li {
    padding-left: 28px;
    margin-bottom: 12px;
    position: relative;
    color: var(--text-body);
    line-height: 1.7;
}

.timeline-description li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 16px;
}

/* ===================================
   References Section
   =================================== */

.references-section {
    background: var(--bg-white);
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 28px;
    background: var(--bg-white);
    color: var(--text-body);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--bg-light);
}

.filter-btn.active {
    background: var(--primary-color);
    color: var(--bg-white);
    border-color: var(--primary-color);
}

.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 32px;
}

.reference-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
    cursor: pointer;
}

.reference-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.reference-image {
    width: 100%;
    height: 240px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 56px;
    position: relative;
    overflow: hidden;
}

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

.reference-content {
    padding: 28px;
}

.reference-category {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-light);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.reference-title {
    font-size: 22px;
    margin-bottom: 10px;
    font-weight: 800;
    line-height: 1.3;
}

.reference-company {
    color: var(--text-light);
    font-size: 15px;
    margin-bottom: 14px;
    font-weight: 600;
}

.reference-description {
    color: var(--text-body);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 18px;
}

.reference-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 18px;
}

.reference-meta i {
    font-size: 14px;
}

.reference-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.reference-tag {
    padding: 6px 12px;
    background: var(--bg-light);
    color: var(--text-body);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

/* ===================================
   Reviews Section
   =================================== */

.reviews-section {
    background: var(--bg-light);
}

.reviews-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 32px;
}

.review-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.review-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
    gap: 16px;
}

.review-author {
    flex: 1;
}

.review-author-name {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 6px;
}

.review-author-title {
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
}

.review-rating {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.review-rating i {
    color: var(--accent-color);
    font-size: 18px;
}

.review-content {
    color: var(--text-body);
    line-height: 1.9;
    margin-bottom: 20px;
    font-size: 16px;
}

.review-course {
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.review-date {
    font-size: 13px;
    color: var(--text-lighter);
    font-weight: 500;
}

/* ===================================
   Contact Section
   =================================== */

.contact-section {
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 80px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-info-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    color: var(--bg-white);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.contact-info-item h4 {
    font-size: 18px;
    margin-bottom: 8px;
    font-weight: 700;
}

.contact-info-item p {
    color: var(--text-body);
    line-height: 1.7;
    margin: 0;
}

.contact-illustration {
    margin-top: 40px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.contact-illustration img {
    width: 100%;
    height: auto;
    display: block;
}

.contact-form-wrapper {
    background: var(--bg-light);
    padding: 48px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
    font-size: 15px;
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group textarea {
    padding: 14px 18px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    transition: all 0.2s ease;
    background: var(--bg-white);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.form-note {
    font-size: 14px;
    color: var(--text-light);
    margin-top: -12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-note i {
    color: var(--primary-color);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--darker-bg);
    color: var(--bg-white);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 16px;
    color: var(--bg-white);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    margin-bottom: 24px;
    font-size: 18px;
    font-weight: 700;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.2s ease;
    font-size: 15px;
}

.footer-links a:hover {
    color: var(--bg-white);
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 14px;
    font-size: 15px;
}

.footer-contact i {
    margin-right: 12px;
    color: var(--primary-light);
    width: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    margin: 0;
}

.footer-bottom i {
    color: #ef4444;
}

/* ===================================
   Modal
   =================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    background: var(--bg-white);
    padding: 48px;
    border-radius: var(--radius-lg);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    z-index: 1;
}

.modal-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-body);
    cursor: pointer;
    transition: color 0.2s ease;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

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

.modal-title {
    font-size: 32px;
    margin-bottom: 32px;
    font-weight: 800;
}

.review-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.rating-input {
    display: flex;
    gap: 12px;
    font-size: 32px;
}

.rating-input i {
    color: var(--border-lighter);
    cursor: pointer;
    transition: all 0.2s ease;
}

.rating-input i:hover,
.rating-input i.active {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* ===================================
   Toast Notification
   =================================== */

.toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    background: var(--primary-color);
    color: var(--bg-white);
    padding: 18px 28px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 10000;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    font-weight: 600;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast i {
    font-size: 22px;
}

/* ===================================
   Loading Spinner
   =================================== */

.loading-spinner {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-light);
    font-size: 18px;
}

.loading-spinner i {
    font-size: 40px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

/* ===================================
   Background Utilities
   =================================== */

.bg-light {
    background: var(--bg-light);
}

.bg-white {
    background: var(--bg-white);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
    .container {
        padding: 0 20px;
    }

    h1 {
        font-size: 48px;
    }

    h2, .section-title {
        font-size: 40px;
    }

    .hero-title {
        font-size: 56px;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .section-padding {
        padding: 80px 0;
    }

    h1 {
        font-size: 36px;
    }

    h2, .section-title {
        font-size: 32px;
    }

    .section-description {
        font-size: 16px;
    }

    /* Navigation */
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-white);
        flex-direction: column;
        padding: 40px 20px;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
        align-items: stretch;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        font-size: 18px;
        padding: 16px 0;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--border-light);
    }

    /* Hero */
    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 16px;
    }

    .hero-stats {
        gap: 40px;
        flex-wrap: wrap;
    }

    .stat-number {
        font-size: 40px;
    }

    /* Timeline */
    .timeline {
        padding-left: 40px;
    }

    .timeline::before {
        left: 16px;
    }

    .timeline-item {
        padding-left: 40px;
    }

    .timeline-marker {
        left: -28px;
        width: 14px;
        height: 14px;
        border-width: 3px;
    }

    .timeline-content {
        padding: 24px;
    }

    /* References & Reviews */
    .references-grid,
    .reviews-container {
        grid-template-columns: 1fr;
    }

    /* Forms */
    .form-row {
        grid-template-columns: 1fr;
    }

    .about-info-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        padding: 32px 24px;
    }

    .contact-form-wrapper {
        padding: 32px 24px;
    }

    .filter-buttons {
        gap: 8px;
    }

    .filter-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 32px;
    }

    .stat-label {
        font-size: 14px;
    }

    .toast {
        bottom: 20px;
        right: 16px;
        left: 16px;
    }

    .about-name {
        font-size: 28px;
    }

    .timeline-title {
        font-size: 20px;
    }

    .reference-title {
        font-size: 19px;
    }

    .modal-title {
        font-size: 26px;
    }
}