/* ==========================================================================
   CSS Reset & Variables
   ========================================================================== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.75);
    --border-color: rgba(226, 232, 240, 0.8);
    --border-hover: rgba(99, 102, 241, 0.4);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --error-color: #ef4444;

    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
}

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

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Bilingual Display Rules
   ========================================================================== */
body.lang-en .lang-ja {
    display: none !important;
}

body.lang-ja .lang-en {
    display: none !important;
}

/* ==========================================================================
   Background Ambient Glow Elements
   ========================================================================== */
.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.4;
    transition: var(--transition-smooth);
}

.bg-glow-1 {
    top: -200px;
    right: -100px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.05) 100%);
}

.bg-glow-2 {
    bottom: -200px;
    left: -200px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.12) 0%, rgba(99, 102, 241, 0.03) 100%);
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo-dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 50%;
    margin-right: 8px;
    display: inline-block;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.logo-accent {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
    position: relative;
}

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

.nav-link.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Language Toggle Button */
.lang-switch {
    display: flex;
    background-color: var(--bg-secondary);
    padding: 3px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
}

.lang-btn {
    border: none;
    background: transparent;
    padding: 6px 12px;
    border-radius: 20px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

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

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

.menu-bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 80px auto 0 auto;
    padding: 3rem 2rem;
    position: relative;
}

/* Tab Sections Animation */
.tab-content {
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.tab-content.active {
    display: block;
    animation: slideInTab 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideInTab {
    0% {
        opacity: 0;
        transform: translateY(15px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Header Styles */
.section-container {
    padding: 2rem 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem auto;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.6rem;
    border-radius: var(--border-radius-md);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--bg-primary);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-icon {
    width: 18px;
    height: 18px;
    transition: var(--transition-smooth);
}

.btn-primary:hover .btn-icon {
    transform: translateX(3px);
}

/* Badge Component */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: inline-block;
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.9);
        opacity: 0.7;
    }
    50% {
        transform: scale(1.3);
        opacity: 1;
    }
    100% {
        transform: scale(0.9);
        opacity: 0.7;
    }
}

/* ==========================================================================
   Home / Hero Section
   ========================================================================== */
.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
    min-height: calc(80vh - 120px);
    padding: 2rem 0;
}

.hero-text {
    max-width: 680px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.8rem;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    line-height: 1.7;
    margin-bottom: 2.5rem;
}

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

/* Hero Visual Representation (Premium SVG Card Sandbox) */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.visual-card-wrapper {
    position: relative;
    width: 100%;
    max-width: 320px;
    height: 320px;
}

.visual-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    height: 240px;
    position: absolute;
    top: 20px;
    left: 0;
    transition: var(--transition-smooth);
}

.visual-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.2);
}

.card-header {
    display: flex;
    gap: 6px;
    margin-bottom: 1.5rem;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background-color: #ef4444; }
.dot.yellow { background-color: #f59e0b; }
.dot.green { background-color: #10b981; }

.card-body-preview {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.preview-line {
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: 4px;
}

.preview-line.long { width: 90%; }
.preview-line.medium { width: 70%; }
.preview-line.short { width: 45%; }

.preview-grid {
    display: flex;
    gap: 0.8rem;
    margin-top: 0.5rem;
}

.preview-box {
    flex: 1;
    height: 60px;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
}

/* Floating Card 2 */
.visual-card.float-2 {
    width: 180px;
    height: auto;
    padding: 1rem 1.25rem;
    top: 150px;
    right: -20px;
    left: auto;
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    animation: floatAnimation 4s ease-in-out infinite;
}

.stat-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-num {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

@keyframes floatAnimation {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0);
    }
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: start;
}

.about-bio h3, .about-skills h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-bio p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.info-list {
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px dashed var(--border-color);
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.info-val {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
}

.skills-category {
    margin-bottom: 2rem;
}

.skills-category h4 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tag {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.9rem;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.tag:hover {
    background-color: var(--primary-light);
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--primary-color);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}

.project-visual {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Gradients for project backgrounds */
.bg-grad-1 { background: linear-gradient(135deg, #a5b4fc 0%, #6366f1 100%); }
.bg-grad-2 { background: linear-gradient(135deg, #81e6d9 0%, #06b6d4 100%); }
.bg-grad-3 { background: linear-gradient(135deg, #fbcfe8 0%, #ec4899 100%); }

.project-illustration {
    width: 80px;
    height: 80px;
    transition: var(--transition-smooth);
}

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

.project-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.project-tag {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.project-name {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    flex: 1;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    margin-top: auto;
}

.link-arrow {
    width: 16px;
    height: 16px;
    transition: var(--transition-smooth);
}

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

.project-link:hover .link-arrow {
    transform: translate(2px, -2px);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: start;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input, .form-group textarea {
    padding: 0.9rem 1.2rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-smooth);
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Contact Details */
.contact-details {
    padding: 1rem 0;
}

.contact-details h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.details-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.contact-email {
    margin-bottom: 2.5rem;
}

.email-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    margin-bottom: 0.4rem;
}

.email-link {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.email-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
}

.social-btn:hover {
    background-color: var(--primary-light);
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.social-icon {
    width: 20px;
    height: 20px;
}

/* Form success message */
.form-status {
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    border-radius: var(--border-radius-sm);
    padding: 0.5rem;
    display: none;
}

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

.form-status.error {
    display: block;
    color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.1);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.main-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    padding: 2rem 0;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ==========================================================================
   Timeline, Awards, & Activities Styling
   ========================================================================== */
.timeline {
    margin-top: 1.5rem;
    position: relative;
    border-left: 2px solid var(--border-color);
    padding-left: 1.5rem;
}

.timeline-item {
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1.5rem - 6px);
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.timeline-meta {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.timeline-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-primary);
}

.timeline-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.timeline-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.awards-list, .activities-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.awards-list li, .activities-list li {
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.awards-list li::before, .activities-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.award-name, .activity-name {
    font-weight: 600;
    color: var(--text-primary);
}

.award-issuer, .activity-role {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: block;
    margin-top: 0.1rem;
}

/* Profile Picture & Project Images */
.profile-pic-wrapper {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--bg-primary);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    margin: 0 auto 2.5rem auto;
    transition: var(--transition-smooth);
    background-color: var(--bg-secondary);
}

.profile-pic-wrapper:hover {
    transform: scale(1.03) translateY(-2px);
    box-shadow: 0 12px 35px rgba(99, 102, 241, 0.15);
    border-color: var(--primary-color);
}

.profile-pic {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.project-card:hover .project-img {
    transform: scale(1.05);
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-text {
        margin: 0 auto;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: 1.5rem;
    }
    
    .about-grid, .contact-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 2rem 1.5rem;
    }
    
    /* Navigation toggle menu (Overlay styling) */
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 73px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 73px);
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        transition: var(--transition-smooth);
        z-index: 999;
        border-top: 1px solid var(--border-color);
    }
    
    .nav-menu.open {
        left: 0;
    }
    
    .nav-link {
        font-size: 1.3rem;
        padding: 0.5rem 2rem;
    }
    
    /* When navigation menu is open, toggle bars transition */
    .navbar.mobile-menu-open .menu-bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .navbar.mobile-menu-open .menu-bar:nth-child(2) {
        opacity: 0;
    }
    
    .navbar.mobile-menu-open .menu-bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}