/* ============================================
    RESET & BASE STYLES
    ============================================ */

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

/* Force remove all underlines from all links */
a,
a:hover,
a:focus,
a:active,
a:visited {
  text-decoration: none !important;
  text-decoration-line: none !important;
  text-decoration-style: none !important;
  text-decoration-color: transparent !important;
}

/* Specific reset for navigation: REMOVES THE BOTTOM LINE ISSUE */
nav a,
.site-nav a,
.nav-link {
  text-decoration: none !important;
  text-decoration-line: none !important;
  border-bottom: none !important;
  box-shadow: none !important;
}

:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-light: #f5f5f5;
  --color-gray-medium: #666666;
  --color-gray-dark: #333333;
  --color-gray-border: #cccccc;
  --color-red-light: #f14c4c;
  --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-nav: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
  --transition-speed: 0.3s;
  --max-width: 1200px;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-black);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1;
  font-kerning: normal;
  /* FIX: prevent horizontal overflow on mobile */
  overflow-x: hidden;
}

/* ============================================
    TYPOGRAPHY
    ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 2rem;
  letter-spacing: -0.025em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-black);
  text-decoration: none !important;
  transition: opacity var(--transition-speed);
}

a:hover,
a:focus,
a:active,
a:visited {
  opacity: 0.7;
  text-decoration: none !important;
}

/* ============================================
    NAVIGATION
    ============================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-border);
  z-index: 1000;
  padding: 0.9rem 0;
}

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

.nav-logo a {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-family: var(--font-nav);
  color: var(--color-black);
}

.nav-logo .nav-name {
  font-weight: 700;
  font-size: 1.5em;
}

.nav-logo .nav-subtitle {
  font-family: var(--font-nav);
  color: var(--color-gray-dark);
  font-size: 1.2rem;
  font-weight: 500;
  border-left: 1px solid var(--color-gray-border);
  padding-left: 0.75rem;
  margin-left: 0.75rem;
}

.nav-links-and-icons {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-size: 1rem;
  font-weight: 400;
  font-family: var(--font-nav);
  text-decoration: none !important;
}

.nav-link:hover,
.nav-link:focus,
.nav-link:active,
.nav-link:visited {
  text-decoration: none !important;
}

.nav-contact-icons {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: all var(--transition-speed);
  background-color: var(--color-gray-light);
}

.nav-icon-link:hover {
  background-color: var(--color-black);
  transform: translateY(-2px);
  opacity: 1;
}

.nav-icon-link .nav-icon {
  width: 20px;
  height: 20px;
  color: var(--color-black);
}

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

/* ============================================
    MAIN CONTENT
    ============================================ */

.main-content {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================
    HOME PAGE
    ============================================ */

.home-page {
  width: 100%;
}

/* ============================================
    PROJECTS SECTION
    ============================================ */

.projects-section {
  padding: 0.5rem 0 var(--spacing-xl) 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 0rem;
}

/* ============================================
    PROJECT CARDS
    ============================================ */

.project-card {
  position: relative;
  transition: transform var(--transition-speed);
}

.project-card:hover {
  transform: translateY(-4px);
}

.card-link {
  display: block;
  color: inherit;
}

.card-image-container {
  position: relative;
  width: 100%;
  height: 350px;
  overflow: hidden;
  background-color: var(--color-gray-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.card-gif {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-speed);
}

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

.view-project-text {
  color: var(--color-white);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0.05em;
}

.card-content {
  padding: 1.0rem 0;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.7rem;
  font-weight: 200;
  border: 0.1px solid var(--color-gray-border);
  background-color: var(--color-white);
  border-radius: 999px;
  transition: all var(--transition-speed);
}

.card-link:hover .tag {
  background-color: var(--color-gray-dark);
  color: var(--color-white);
  border-color: var(--color-gray-dark);
}

/* ============================================
    ABOUT SECTION (includes contact)
    ============================================ */

.about-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-white);
}

.about-section h2 {
  margin-bottom: 3rem;
  text-align: left;
}

.about-content {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 4rem;
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
}

.about-photo {
  position: sticky;
  top: 120px;
}

.profile-image {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.profile-image:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.about-text {
  padding-top: 0;
}

.about-text p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--color-gray-dark);
}

.about-text p:last-of-type {
  margin-bottom: 2.5rem;
}

.contact-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-gray-border);
  flex-wrap: wrap;
}

.contact-icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: all var(--transition-speed);
  background-color: var(--color-gray-light);
}

.contact-icon-link:hover {
  background-color: var(--color-black);
  transform: translateY(-2px);
  opacity: 1;
}

.contact-icon-link .contact-icon {
  width: 20px;
  height: 20px;
  color: var(--color-black);
}

.contact-icon-link:hover .contact-icon {
  color: var(--color-white);
}

.email-contact {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background-color: var(--color-gray-light);
  border-radius: 999px;
  transition: all var(--transition-speed);
  /* FIX: prevent email from overflowing its container */
  min-width: 0;
  overflow: hidden;
}

.email-contact:hover {
  background-color: var(--color-gray-medium);
}

.email-text {
  font-size: 0.95rem;
  color: var(--color-gray-dark);
  font-weight: 400;
  /* FIX: allow long email addresses to wrap/truncate */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.copy-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border: none;
  background-color: transparent;
  cursor: pointer;
  border-radius: 50%;
  transition: all var(--transition-speed);
  padding: 0;
}

.copy-icon-btn:hover {
  background-color: var(--color-black);
}

.copy-icon {
  width: 16px;
  height: 16px;
  color: var(--color-gray-dark);
}

.copy-icon-btn:hover .copy-icon {
  color: var(--color-white);
}

.copy-icon-btn.copied {
  background-color: var(--color-black);
}

.copy-icon-btn.copied .copy-icon {
  color: var(--color-white);
}

/* ============================================
    PROJECT PAGE
    ============================================ */

.project-page {
  padding: var(--spacing-lg) 0;
  width: 70%;
  margin-left: auto;
  margin-right: auto;
}

.project-container {
  max-width: 1400px;
  width: 95%;
  margin: 0 auto;
  padding: 0 2rem;
}

.project-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-gray-border);
}

.project-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.project-content {
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 100%;
}

.project-content h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.025em;
}

.project-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.project-figure {
  margin: 30px auto;
  text-align: center;
}

.project-figure img {
  width: auto !important;
  max-width: 600px;
  margin: 0 auto;
  display: block;
}

.project-figure figcaption {
  font-size: 0.9rem;
  color: #666;
  margin-top: 8px;
  font-style: italic;
}

.project-content img {
  max-width: 100%;
  width: 100%;
  height: auto;
  display: block;
  margin: 2rem 0;
  border: 1px solid var(--color-gray-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.project-content video {
  max-width: 100%;
  width: 100%;
  height: auto;
  display: block;
  margin: 2rem 0;
  border: 1px solid var(--color-gray-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Carousel Styles */
.project-carousel {
  margin: 2rem 0;
  width: 100%;
}

.carousel-wrapper {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.carousel-inner {
  position: relative;
  width: 100%;
  height: 600px;
  overflow: hidden;
  border-radius: 8px;
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.carousel-item {
  display: none;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

.carousel-item.active {
  display: block;
  opacity: 1;
  position: relative;
}

.carousel-item img,
.carousel-item video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  border: none;
  margin: 0;
}

.carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0, 0, 0, 0.5);
  color: var(--color-white);
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-speed);
  z-index: 10;
}

.carousel-nav:hover {
  background-color: rgba(0, 0, 0, 0.8);
  transform: translateY(-50%) scale(1.1);
}

.carousel-prev {
  left: 20px;
}

.carousel-next {
  right: 20px;
}

.carousel-nav svg {
  width: 24px;
  height: 24px;
}

.carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 1rem;
}

.carousel-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  background-color: var(--color-gray-border);
  cursor: pointer;
  transition: all var(--transition-speed);
  padding: 0;
}

.carousel-dot:hover {
  background-color: var(--color-gray-medium);
  transform: scale(1.2);
}

.carousel-dot.active {
  background-color: var(--color-gray-dark);
  width: 14px;
  height: 14px;
}

.side-by-side {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
  width: 100%;
}

.side-by-side img {
  margin: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-content pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 1.5rem;
  background-color: var(--color-gray-light);
  border-radius: 4px;
  margin: 2rem 0;
}

.project-content code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
  font-size: 0.9em;
}

.project-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  overflow-x: auto;
  display: block;
}

.project-content table th,
.project-content table td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-border);
  text-align: left;
}

.project-content table th {
  background-color: var(--color-gray-light);
  font-weight: 600;
}

.project-footer {
  margin-top: 1rem;
  padding-top: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 0.75rem;
  border: 1px solid var(--color-gray-medium);
  border-bottom: 1px solid var(--color-gray-medium) !important;
  box-shadow: none !important;
  font-weight: 400;
  transition: all var(--transition-speed);
}

.back-link:hover {
  background-color: var(--color-black);
  color: var(--color-white);
  opacity: 1;
}

/* ============================================
    PAGE LAYOUT (Resume, etc.)
    ============================================ */

.page {
  padding: 0;
}

.page-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 0rem;
}

.page-header {
  margin-bottom: 2rem;
  padding-bottom: 0rem;
  border-bottom: 1px solid var(--color-gray-border);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.page-content {
  margin-top: 0;
}

.pdf-embed {
  width: 100%;
  height: 85vh;
  border: 1px solid var(--color-black);
  margin-top: 2rem;
}

/* ============================================
    FOOTER
    ============================================ */

.site-footer {
  border-top: 0px solid var(--color-black);
  padding: 2rem 0;
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
}

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

/* ============================================
    RESPONSIVE DESIGN
    ============================================ */

/* Large Desktop (ultra-wide) */
@media (min-width: 1600px) {
  .project-container {
    max-width: 1600px;
    width: 90%;
  }

  .project-content {
    font-size: 1.1rem;
  }

  .side-by-side {
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 1rem;
  }
}

/* Tablet (2 columns) */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .about-content {
    grid-template-columns: 180px 1fr;
    gap: 2.5rem;
    max-width: 100%;
  }

  .profile-image {
    width: 180px;
    height: 180px;
  }

  .contact-info {
    gap: 1.25rem;
  }

  .project-container {
    max-width: 100%;
    width: 92%;
    padding: 0 1.5rem;
  }

  .project-title {
    font-size: 2.25rem;
  }

  .project-content {
    font-size: 1rem;
  }

  .project-content h2 {
    font-size: 1.65rem;
  }

  .project-content h3 {
    font-size: 1.25rem;
  }

  .side-by-side {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
    width: 50%;
  }

  .project-content table {
    font-size: 0.95rem;
  }

  .carousel-inner {
    height: 500px;
  }

  .carousel-nav {
    width: 44px;
    height: 44px;
  }

  .carousel-prev {
    left: 15px;
  }

  .carousel-next {
    right: 15px;
  }
}

/* Mobile (1 column) */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }

  body {
    font-size: 16px;
  }

  /* FIX: nav-subtitle hides at mobile to prevent crowding */
  .nav-logo .nav-subtitle {
    display: none;
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
  }

  .nav-logo a {
    display: flex;
    align-items: center;
    font-size: 1.1rem;
    color: var(--color-black);
    font-weight: 700;
  }

  .nav-logo .nav-name {
    font-weight: 700;
    color: var(--color-black);
  }

  .nav-links-and-icons {
    display: flex;
    align-items: center;
    gap: 10px;
  }

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

  .nav-icon-link {
    width: 32px;
    height: 32px;
  }

  .nav-icon-link .nav-icon {
    width: 16px;
    height: 16px;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-link {
    font-size: 0.9rem;
  }

  .container {
    padding: 0 1rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .card-image-container {
    height: 350px;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .about-photo {
    position: static;
    display: flex;
    justify-content: center;
  }

  .profile-image {
    width: 180px;
    height: 180px;
  }

  .about-text p {
    text-align: left;
    font-size: 1rem;
  }

  .contact-info {
    justify-content: center;
    padding-top: 2rem;
  }

  /* FIX: email contact wraps gracefully on small screens */
  .email-contact {
    padding: 0.6rem 1rem;
    max-width: 100%;
  }

  .email-text {
    font-size: 0.85rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  /* FIX: project-page width reset — was stuck at 70% on mobile */
  .project-page {
    padding: 2rem 0;
    width: 100%;
  }

  .project-container {
    width: 100%;
    max-width: 100%;
    padding: 0 1rem;
  }

  .project-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
  }

  .project-title {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  /* FIX: was font-size: 0.5rem; line-height: 0.5 — nearly invisible */
  .project-overview {
    font-size: 1rem;
    line-height: 1.7;
  }

  .project-content {
    font-size: 0.95rem;
    line-height: 1.7;
  }

  .project-content h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
  }

  .project-content h3 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
  }

  .project-content img,
  .project-content video {
    margin: 1.5rem 0;
    border-radius: 4px;
  }

  .side-by-side {
    grid-template-columns: 1fr;
    gap: 1rem;
    width: 100%;
  }

  .project-content pre {
    display: block;
    overflow-x: auto;
    padding: 1rem;
    font-size: 0.85rem;
    border-radius: 4px;
    -webkit-overflow-scrolling: touch;
  }

  .project-content table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    font-size: 0.85rem;
    -webkit-overflow-scrolling: touch;
  }

  .project-content table th,
  .project-content table td {
    padding: 0.5rem 0.75rem;
  }

  .project-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
  }

  .back-link {
    padding: 0.65rem 1.25rem;
    font-size: 0.95rem;
  }

  .carousel-inner {
    height: 400px;
  }

  .carousel-nav {
    width: 40px;
    height: 40px;
  }

  .carousel-nav svg {
    width: 20px;
    height: 20px;
  }

  .carousel-prev {
    left: 10px;
  }

  .carousel-next {
    right: 10px;
  }

  .carousel-dot {
    width: 10px;
    height: 10px;
  }

  .carousel-dot.active {
    width: 12px;
    height: 12px;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .nav-links {
    gap: 0.75rem;
  }

  .nav-link {
    font-size: 0.85rem;
  }

  .card-image-container {
    height: 300px;
  }

  .project-container {
    padding: 0 0.75rem;
  }

  .project-title {
    font-size: 1.5rem;
    word-wrap: break-word;
  }

  .project-content {
    font-size: 0.9rem;
  }

  .project-content h2 {
    font-size: 1.35rem;
  }

  .project-content h3 {
    font-size: 1.1rem;
  }

  .project-tags {
    gap: 0.4rem;
  }

  .tag {
    font-size: 0.7rem;
    padding: 0.3rem 0.75rem;
  }

  .project-content pre {
    padding: 0.75rem;
    font-size: 0.8rem;
    margin: 1rem 0;
  }

  .back-link {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .carousel-inner {
    height: 300px;
  }

  .carousel-nav {
    width: 36px;
    height: 36px;
  }

  .carousel-nav svg {
    width: 18px;
    height: 18px;
  }

  .carousel-prev {
    left: 8px;
  }

  .carousel-next {
    right: 8px;
  }
}

/* ============================================
    UTILITY CLASSES
    ============================================ */

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

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }