/* ==========================================================================
   DEVELOPER PORTFOLIO - BISHWAMBHAR SEN
   Premium Dark/Light Responsive Design System
   ========================================================================== */

/* --- Design Tokens / Core Variables --- */
:root {
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

    /* Theme-independent colors */
    --accent-color: #00A1E0; /* Salesforce Blue */
    --accent-color-hover: #0080b3;
    --accent-glow: rgba(0, 161, 224, 0.15);
    
    /* Certification-specific colors */
    --gold: #FFDF00;
    --gold-glow: rgba(255, 223, 0, 0.2);
    --blue-cert: #00A1E0;
    --blue-glow: rgba(0, 161, 224, 0.2);
    --purple: #9C27B0;
    --purple-glow: rgba(156, 39, 176, 0.2);
    --green: #4CAF50;
    --green-glow: rgba(76, 175, 80, 0.2);
    --teal: #008080;
    --teal-glow: rgba(0, 128, 128, 0.2);
}

/* --- Dark Theme Variables (Default) --- */
.dark-theme {
    --bg-main: #0a0f1d;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-navbar: rgba(10, 15, 29, 0.85);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-active: rgba(0, 161, 224, 0.4);
    
    --text-primary: #f3f4f6;
    --text-muted: #9ca3af;
    --text-heading: #ffffff;
    
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --navbar-shadow: 0 4px 20px 0 rgba(0, 0, 0, 0.3);
    
    --timeline-line: rgba(255, 255, 255, 0.1);
}

/* --- Light Theme Variables --- */
.light-theme {
    --bg-main: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-navbar: rgba(248, 250, 252, 0.85);
    
    --border-color: rgba(15, 23, 42, 0.08);
    --border-active: rgba(0, 161, 224, 0.5);
    
    --text-primary: #334155;
    --text-muted: #64748b;
    --text-heading: #0f172a;
    
    --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    --navbar-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    
    --timeline-line: rgba(15, 23, 42, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

/* --- Typography Utilities --- */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-heading);
    font-weight: 700;
    line-height: 1.25;
}

strong {
    color: var(--text-heading);
}

.highlight {
    color: var(--accent-color);
    background: linear-gradient(120deg, var(--accent-color) 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* --- Layout Containers --- */
section {
    padding: 100px 20px;
    border-bottom: 1px solid var(--border-color);
}

.section-container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-subtitle {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: block;
    margin-bottom: 8px;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-description {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin-bottom: 48px;
}

/* --- Header / Navigation Bar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-navbar);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background-color 0.4s ease, border-color 0.4s ease, box-shadow 0.3s ease;
}

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-heading);
}

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

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 6px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* --- Theme Toggle Switch --- */
.theme-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.theme-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: var(--accent-glow);
}

.sun-icon {
    width: 20px;
    height: 20px;
    display: none;
}

.moon-icon {
    width: 20px;
    height: 20px;
    display: block;
}

.dark-theme .sun-icon {
    display: block;
}

.dark-theme .moon-icon {
    display: none;
}

/* --- Mobile Menu Button --- */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 4px;
    z-index: 1100;
}

.mobile-nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-heading);
    transition: all 0.3s ease;
}

/* --- Button Styles --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff !important;
    border: 1px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: var(--accent-color-hover);
    border-color: var(--accent-color-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

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

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

/* --- Hero Section --- */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 160px 20px 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 64px;
    align-items: center;
}

.hero-pretitle {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 1rem;
    display: block;
    margin-bottom: 12px;
    font-weight: 500;
}

.hero-title {
    font-size: 4rem;
    letter-spacing: -1.5px;
    margin-bottom: 8px;
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-description {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 620px;
}

.hero-meta {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.meta-item svg {
    color: var(--accent-color);
}

.meta-item a:hover {
    color: var(--text-heading);
    text-decoration: underline;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.social-link:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: var(--accent-glow);
    transform: translateY(-3px);
}

/* --- Hero Statistics Grid --- */
.hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-active);
}

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

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.highlight-card {
    background: linear-gradient(135deg, rgba(0, 161, 224, 0.08) 0%, rgba(59, 130, 246, 0.03) 100%);
    border-color: rgba(0, 161, 224, 0.2);
}

.highlight-card .stat-number {
    color: var(--accent-color);
}

/* --- Salesforce Certifications --- */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 24px;
}

.cert-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cert-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.cert-badge-wrapper {
    width: 100px;
    height: 115px;
    margin-bottom: 20px;
    position: relative;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.cert-card:hover .cert-badge-wrapper {
    transform: scale(1.08) rotate(3deg);
}

.cert-svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.25));
}

.cert-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 12px;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
    text-transform: uppercase;
}

/* Card Special Borders & Tags */
.gold-border:hover { border-color: var(--gold); box-shadow: 0 8px 24px var(--gold-glow); }
.gold-tag { background-color: var(--gold-glow); color: #f59e0b; }

.blue-border:hover { border-color: var(--blue-cert); box-shadow: 0 8px 24px var(--blue-glow); }
.blue-tag { background-color: var(--blue-glow); color: var(--accent-color); }

.purple-border:hover { border-color: var(--purple); box-shadow: 0 8px 24px var(--purple-glow); }
.purple-tag { background-color: var(--purple-glow); color: #a855f7; }

.green-border:hover { border-color: var(--green); box-shadow: 0 8px 24px var(--green-glow); }
.green-tag { background-color: var(--green-glow); color: #22c55e; }

.teal-border:hover { border-color: var(--teal); box-shadow: 0 8px 24px var(--teal-glow); }
.teal-tag { background-color: var(--teal-glow); color: #14b8a6; }

/* --- Experience Timeline Section --- */
.timeline {
    position: relative;
    max-width: 850px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 31px;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--timeline-line);
}

.timeline-item {
    position: relative;
    margin-bottom: 60px;
    padding-left: 80px;
}

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

.timeline-dot {
    position: absolute;
    left: 20px;
    top: 5px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--bg-main);
    border: 3px solid var(--accent-color);
    z-index: 10;
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
    background-color: var(--accent-color);
    box-shadow: 0 0 12px var(--accent-color);
    transform: scale(1.1);
}

.timeline-date {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.timeline-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--card-shadow);
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.timeline-item:hover .timeline-content {
    border-color: var(--border-active);
    transform: translateY(-3px);
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 6px;
}

.company {
    font-size: 1.05rem;
    color: var(--accent-color);
    margin-bottom: 16px;
    font-weight: 500;
}

.company .location {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 400;
}

.duties-list {
    margin-left: 20px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.duties-list li {
    margin-bottom: 8px;
}

.duties-list li::marker {
    color: var(--accent-color);
}

/* --- Scroll Reveal Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* --- Technical Skills Section --- */
.skills-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
}

.filter-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.filter-btn.active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: #ffffff;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.skill-category-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.skill-category-card:hover {
    border-color: var(--border-active);
    transform: translateY(-3px);
}

.skill-category-card h3 {
    font-size: 1.15rem;
    margin-bottom: 20px;
    border-left: 3px solid var(--accent-color);
    padding-left: 12px;
}

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

.skill-tag {
    font-size: 0.85rem;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.skill-tag:hover {
    background-color: var(--accent-glow);
    border-color: var(--accent-color);
    color: var(--text-heading);
    transform: scale(1.03);
}

/* --- Education Section --- */
.education-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--card-shadow);
    max-width: 800px;
    margin: 0 auto;
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 12px;
}

.edu-header h3 {
    font-size: 1.5rem;
}

.edu-date {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-weight: 600;
}

.education-card h4 {
    font-size: 1.15rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 8px;
}

.school {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.edu-location {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* --- Contact Section --- */
.contact-wrapper {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--card-shadow);
}

.contact-info h3 {
    font-size: 1.4rem;
    margin-bottom: 24px;
}

.info-items {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.info-item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.info-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background-color: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    flex-shrink: 0;
}

.info-text {
    display: flex;
    flex-direction: column;
}

.info-label {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    color: var(--text-muted);
}

.info-text a, .info-text span {
    font-size: 0.95rem;
    font-weight: 600;
}

.info-text a:hover {
    color: var(--accent-color);
}

/* Form Styles */
.contact-form-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--card-shadow);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input, .form-group textarea {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-heading);
    padding: 12px 16px;
    border-radius: 8px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    width: 100%;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.btn-submit {
    justify-content: center;
    margin-top: 10px;
    width: 100%;
}

.submit-arrow {
    transition: transform 0.3s ease;
}

.btn-submit:hover .submit-arrow {
    transform: translateX(4px);
}

/* --- Footer --- */
footer {
    padding: 40px 20px;
    text-align: center;
    background-color: var(--bg-secondary);
}

.footer-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.copyright {
    font-size: 0.95rem;
    font-weight: 500;
}

.tagline {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* --- Toast Notification --- */
.toast-notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--accent-color);
    border-radius: 8px;
    padding: 16px 24px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    z-index: 2000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.toast-message {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent-color);
}

/* --- Responsive Media Queries --- */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }
    
    .hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-meta {
        align-items: center;
    }
    
    .hero-stats {
        max-width: 600px;
        margin: 0 auto;
        width: 100%;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 20px;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    /* Responsive Navigation Menu */
    .mobile-nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg-main);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        gap: 0;
        text-align: center;
        padding: 20px 0;
        transform: translateY(-150%);
        transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        z-index: 999;
        box-shadow: var(--navbar-shadow);
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-link {
        display: block;
        padding: 16px 0;
        font-size: 1.1rem;
    }
    
    .nav-link::after {
        display: none;
    }
    
    /* Burger Icon Transition to X */
    .mobile-nav-toggle.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .mobile-nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-nav-toggle.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    /* Timeline adjustments for mobile */
    .timeline::before {
        left: 17px;
    }
    
    .timeline-item {
        padding-left: 45px;
    }
    
    .timeline-dot {
        left: 6px;
        width: 20px;
        height: 20px;
    }
    
    .timeline-content {
        padding: 20px;
    }
    
    .edu-header {
        flex-direction: column;
        gap: 4px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .certifications-grid {
        grid-template-columns: 1fr;
    }
}