/* ===== CSS Variables ===== */
:root {
    --primary-dark: #0a2647;
    --primary: #144272;
    --primary-medium: #205295;
    --primary-light: #2c74b3;
    --accent: #3498db;
    --accent-light: #5dade2;
    --accent-glow: rgba(52, 152, 219, 0.3);
    --bg-white: #ffffff;
    --bg-light: #f0f7ff;
    --bg-gray: #f8f9fc;
    --text-dark: #0a1929;
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #7f8c8d;
    --border-light: #e8edf5;
    --shadow-sm: 0 2px 8px rgba(10, 38, 71, 0.06);
    --shadow-md: 0 4px 20px rgba(10, 38, 71, 0.1);
    --shadow-lg: 0 10px 40px rgba(10, 38, 71, 0.12);
    --shadow-xl: 0 20px 60px rgba(10, 38, 71, 0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-width: 1140px;
    --nav-height: 70px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font);
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul { list-style: none; }

img { max-width: 100%; display: block; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.btn i { font-size: 1rem; }

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

.btn-primary:hover {
    background: var(--primary-medium);
    border-color: var(--primary-medium);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(20, 66, 114, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(20, 66, 114, 0.2);
}

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

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

.btn-lg {
    padding: 16px 40px;
    font-size: 1rem;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--border-light);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: -0.5px;
}

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

.nav-list {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.bar {
    width: 24px;
    height: 2.5px;
    background: var(--text-primary);
    border-radius: 4px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: calc(var(--nav-height) + 40px) 0 60px;
    background: linear-gradient(135deg, var(--bg-light) 0%, #e8f0fe 50%, var(--bg-white) 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 150%;
    background: radial-gradient(ellipse at center, rgba(52, 152, 219, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 8px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-name {
    font-size: 3.8rem;
    font-weight: 800;
    color: var(--primary-dark);
    line-height: 1.1;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-medium);
    margin-bottom: 16px;
}

.hero-role-wrapper {
    margin-bottom: 32px;
}

.hero-role-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 6px;
}

.hero-typewriter {
    font-size: 1.05rem;
    color: var(--accent);
    font-weight: 500;
    min-height: 1.6em;
}

.typewriter-cursor {
    animation: blink 0.8s step-end infinite;
    margin-left: 2px;
}

@keyframes blink {
    50% { opacity: 0; }
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

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

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-white);
    color: var(--primary);
    font-size: 1.2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.hero-img-frame {
    position: relative;
}

.hero-img-frame::before {
    content: '';
    position: absolute;
    inset: -10px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    opacity: 0.2;
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); opacity: 0.2; }
    50% { transform: scale(1.05); opacity: 0.3; }
}

.hero-img {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-xl);
    border: 4px solid rgba(255, 255, 255, 0.8);
    display: block;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 1px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== Section Shared ===== */
.section {
    padding: 100px 0;
}

.section:nth-child(even) {
    background: var(--bg-gray);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    background: rgba(52, 152, 219, 0.1);
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.divider-line {
    width: 50px;
    height: 2px;
    background: var(--border-light);
    border-radius: 2px;
}

.divider-dot {
    color: var(--accent);
    font-size: 0.5rem;
    line-height: 1;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 580px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ===== About Section ===== */
.about-content {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 60px;
    align-items: start;
}

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

.about-img-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-dark), transparent);
    opacity: 0.1;
    z-index: 1;
}

.about-img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-lg);
    display: block;
}

.about-text h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 4px;
}

.about-subtitle {
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 20px;
}

.about-desc {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 28px 0;
}

.about-detail-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 12px 16px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
}

.detail-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.about-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ===== Experience / Timeline ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--border-light));
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

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

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-white);
    box-shadow: 0 0 0 3px var(--accent);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 28px 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.timeline-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.timeline-date i {
    margin-right: 6px;
    color: var(--accent);
}

.timeline-badge {
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(52, 152, 219, 0.1);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary-medium);
    margin-bottom: 12px;
}

.timeline-desc {
    padding-left: 20px;
}

.timeline-desc li {
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 8px;
    line-height: 1.7;
}

.timeline-desc li::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ===== Skills ===== */
.skills-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.skills-category {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 28px 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.skills-category:hover {
    box-shadow: var(--shadow-md);
}

.skills-cat-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skills-cat-title i {
    color: var(--accent);
    font-size: 1.2rem;
}

.skill-item {
    margin-bottom: 20px;
}

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

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.skill-percent {
    color: var(--accent);
    font-weight: 700;
}

.skill-bar {
    height: 8px;
    border-radius: 4px;
    background: var(--bg-light);
    overflow: hidden;
}

.skill-bar-fill {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    width: 0;
    transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Resume Section ===== */
.resume-content {
    display: flex;
    justify-content: center;
}

.resume-card {
    max-width: 520px;
    text-align: center;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.resume-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.resume-icon {
    font-size: 3.5rem;
    color: var(--accent);
    margin-bottom: 16px;
}

.resume-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 12px;
}

.resume-desc {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.resume-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.resume-meta span {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.resume-meta i {
    color: var(--accent);
}

/* ===== Contact Section ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-info {
    display: grid;
    gap: 20px;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 24px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.contact-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(52, 152, 219, 0.1);
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.contact-card h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-card a,
.contact-card span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.contact-card a:hover {
    color: var(--accent);
}

.contact-form {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95rem;
    color: var(--text-primary);
    background: var(--bg-light);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    background: var(--bg-white);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit {
    width: 100%;
    justify-content: center;
}

/* ===== Footer ===== */
.footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.9);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 0.9rem;
    opacity: 0.7;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.9rem;
    opacity: 0.7;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent-light);
}

.footer-social {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding-top: 0;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 1rem;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 0.85rem;
    opacity: 0.6;
}

.footer-bottom i {
    color: #e74c3c;
    margin: 0 4px;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-medium);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ===== Animations ===== */
.animate-fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-name { font-size: 3rem; }
    .hero-img { width: 260px; height: 260px; }
    .about-content { gap: 40px; }
}

@media (max-width: 900px) {
    .hero-content { grid-template-columns: 1fr; text-align: center; gap: 40px; }
    .hero-image { order: -1; }
    .hero-img { width: 200px; height: 200px; }
    .hero-actions { justify-content: center; }
    .hero-social { justify-content: center; }
    .hero-role-label { text-align: center; }
    .hero-typewriter { text-align: center; }
    .about-content { grid-template-columns: 1fr; text-align: center; }
    .about-details { grid-template-columns: 1fr; }
    .about-cta { justify-content: center; }
    .about-detail-item { align-items: center; text-align: center; }
    .section-title { font-size: 2rem; }
}

@media (max-width: 768px) {
    :root { --nav-height: 60px; }

    .nav-list {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-110%);
        opacity: 0;
        transition: var(--transition);
    }

    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-link {
        display: block;
        padding: 14px 20px;
        font-size: 1rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero { padding-top: calc(var(--nav-height) + 20px); }
    .hero-name { font-size: 2.4rem; }
    .hero-title { font-size: 1.05rem; }
    .section { padding: 70px 0; }
    .section-title { font-size: 1.8rem; }
    .section-header { margin-bottom: 40px; }

    .skills-content { grid-template-columns: 1fr; }
    .contact-content { grid-template-columns: 1fr; }
    .contact-form { padding: 24px; }

    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .footer-links { flex-direction: row; flex-wrap: wrap; justify-content: center; gap: 16px; }
    .footer-social { justify-content: center; }

    .resume-card { padding: 32px 24px; }
    .timeline { padding-left: 32px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-name { font-size: 2rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; padding: 14px 24px; }
    .timeline-content { padding: 20px; }
    .skills-category { padding: 20px; }
    .contact-card { padding: 16px; }
    .resume-meta { flex-direction: column; align-items: center; gap: 8px; }
    .back-to-top { bottom: 16px; right: 16px; width: 42px; height: 42px; font-size: 1rem; }
}