:root {
  --bg-primary: #fff;
  --bg-secondary: #f9f9f9;
  --bg-tertiary: #f5f5f5;
  --text-primary: #000;
  --text-secondary: #666;
  --text-tertiary: #999;
  --border-color: #e5e5e5;
  --hover-bg: #f0f0f0;
}

[data-theme="dark"] {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #fff;
  --text-secondary: #b0b0b0;
  --text-tertiary: #808080;
  --border-color: #333;
  --hover-bg: #252525;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

nav {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.nav-links {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

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


.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: background-color 0.2s, color 0.3s ease;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.sun-icon {
  display: none;
}

.moon-icon {
  display: block;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

[data-theme="dark"] .moon-icon {
  display: none;
}


.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  color: var(--text-primary);
  transition: background-color 0.2s;
}

.mobile-menu-btn:hover {
  background: var(--bg-tertiary);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
  display: block;
}


.mobile-nav {
  display: none;
  position: fixed;
  top: 61px;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 20px;
  z-index: 99;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav a {
  display: block;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  transition: color 0.2s;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  color: var(--text-secondary);
}



.hero {
  padding: 120px 0 80px 0;
  text-align: left;
  position: relative;
}

.hero-content {
  max-width: 700px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  transition: all 0.3s ease;
}

.hero h1 {
  margin-bottom: 24px;
  line-height: 1.1;
}

.hero-title-main {
  display: block;
  font-size: 56px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  transition: color 0.3s ease;
}

.hero-title-sub {
  display: block;
  font-size: 36px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--text-secondary) 0%, var(--text-tertiary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 32px;
  transition: color 0.3s ease;
}

.hero-description strong {
  color: var(--text-primary);
  font-weight: 600;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
}

.btn {
  padding: 10px 15px;
  text-decoration: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: transform 0.3s ease;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  border: 2px solid var(--text-primary);
  box-shadow: 0 4px 14px 0 rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(0, 0, 0, 0.15);
}

.btn-primary:hover svg {
  transform: translateX(4px);
}

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

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

.btn:disabled,
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}



.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.hero-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.hero-link:hover {
  background: var(--hover-bg);
  border-color: var(--text-primary);
  color: var(--text-primary);
  transform: translateY(-2px);
}


section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.3s ease;
}

section:last-of-type {
  border-bottom: none;
}

h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 40px;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.section-subtitle {
  font-size: 24px;
  font-weight: 600;
  margin: 30px 0 20px 0;
  color: var(--text-primary);
  transition: color 0.3s ease;
}


.about-content p {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
  transition: color 0.3s ease;
}

.about-two-column {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 60px;
  align-items: start;
  margin-bottom: 60px;
}

.about-text {
  max-width: 700px;
}

.about-lead {
  font-size: 20px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 24px;
  transition: color 0.3s ease;
}

.about-lead em {
  font-style: italic;
  color: var(--text-secondary);
}

.about-image {
  flex: 0 0 350px;
  max-width: 350px;
  height: 400px;
  position: relative;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-image:hover img {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  border-color: var(--accent-primary);
}

.image-placeholder svg {
  width: 100%;
  height: 100%;
}


.education-section {
  margin-top: 50px;
}

.education-minimal {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.edu-item-minimal {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: all 0.3s ease;
  height: 100%;
}

.edu-item-minimal:hover {
  border-color: var(--text-primary);
  transform: translateY(-4px);
}

.edu-main {
  width: 100%;
}

.edu-main h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  transition: color 0.3s ease;
  line-height: 1.4;
}

.edu-degree {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.3s ease;
  margin-bottom: 4px;
}

.edu-location {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.edu-meta-minimal {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  margin-top: auto;
}

.edu-year {
  font-size: 14px;
  color: var(--text-tertiary);
}

.edu-score {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: 6px;
  display: inline-block;
  margin-top: 4px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.project {
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.project:hover {
  background: var(--hover-bg);
  border-color: var(--text-tertiary);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  margin-bottom: 12px;
}

.project-duration {
  font-size: 13px;
  color: var(--text-tertiary);
  white-space: nowrap;
  transition: color 0.3s ease;
}

.company-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
  margin-top: -8px;
  transition: color 0.3s ease;
}

.project h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.project p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 15px;
  line-height: 1.6;
  transition: color 0.3s ease;
}

.project-highlights {
  margin: 15px 0;
  padding-left: 20px;
}

.project-highlights li {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.5;
  transition: color 0.3s ease;
}

.project-highlights li::marker {
  color: var(--text-tertiary);
}

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

.tag {
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 4px 12px;
  border-radius: 4px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.project-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 15px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  padding: 6px 14px;
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.2s;
  border: 1px solid var(--border-color);
}

.project-link:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}


.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
}

.skill-category h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.skill-badge {
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  padding: 6px 14px;
  border-radius: 4px;
  transition: background-color 0.3s ease, color 0.3s ease;
}


.coursework-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.coursework-item {
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.coursework-item:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}


.contact-content {
  max-width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-form {
  width: 100%;
}

.contact-info,
.contact-social {
  display: flex;
  flex-direction: column;
}

.contact-social p {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  transition: color 0.3s ease;
}

.social-icons-container {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.social-icon-tile {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.social-icon-tile:hover {
  background: var(--hover-bg);
  border-color: var(--text-primary);
  color: var(--text-primary);
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.social-icon-tile svg {
  width: 24px;
  height: 24px;
}


.contact-info p {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 30px;
  transition: color 0.3s ease;
}

.contact-method {
  display: block;
  padding: 20px;
  background: var(--bg-secondary);
  border-radius: 8px;
  text-decoration: none;
  margin-bottom: 15px;
  transition: background 0.2s;
}

.contact-method:hover {
  background: var(--hover-bg);
}

.response-expectation {
  font-size: 14px;
  color: var(--text-tertiary);
  margin-top: -20px;
  margin-bottom: 30px;
  font-style: italic;
}

.method-label {
  font-size: 13px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 5px;
  transition: color 0.3s ease;
}

.method-value {
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s ease;
}


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

.form-label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.2s, background-color 0.3s ease, color 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--text-primary);
}

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


footer {
  padding: 40px 0;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 14px;
  transition: color 0.3s ease;
}


@media (max-width: 768px) {


  .container {
    padding: 0 16px;
  }


  nav {
    padding: 15px 0;
  }

  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .logo {
    font-size: 18px;
  }


  .hero {
    padding: 60px 0 50px 0;
  }

  .hero-badge {
    font-size: 13px;
    padding: 6px 14px;
    margin-bottom: 20px;
  }

  .hero-title-main {
    font-size: 36px;
  }

  .hero-title-sub {
    font-size: 24px;
  }

  .hero-description {
    font-size: 16px;
    line-height: 1.6;
  }

  .btn {
    width: 100%;
    justify-content: center;
    padding: 14px 28px;
    font-size: 16px;
  }

  .hero-stats {
    gap: 24px;
    padding: 16px 0;
    margin-bottom: 24px;
  }

  .stat-value {
    font-size: 24px;
  }

  .stat-label {
    font-size: 11px;
  }

  .hero-links {
    justify-content: flex-start;
    gap: 8px;
  }

  .hero-link {
    font-size: 13px;
    padding: 8px 14px;
  }

  .hero-link svg {
    width: 16px;
    height: 16px;
  }


  section {
    padding: 50px 0;
    scroll-margin-top: 30px;
  }

  h2 {
    font-size: 26px;
    margin-bottom: 30px;
  }

  .section-subtitle {
    font-size: 20px;
    margin: 25px 0 15px 0;
  }


  .about-content p {
    font-size: 16px;
  }

  .about-lead {
    font-size: 18px;
  }

  .about-two-column {
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 40px;
  }

  .about-image {
    position: relative;
    top: 0;
    order: -1;
  }

  .image-placeholder {
    max-width: 200px;
    margin: 0 auto;
  }


  .education-section {
    margin-top: 40px;
  }

  .education-minimal {
    grid-template-columns: 1fr;
  }

  .edu-item-minimal {
    padding: 20px;
  }


  .projects-grid,
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .project {
    padding: 20px;
  }

  .project h3 {
    font-size: 18px;
  }

  .project p,
  .project-highlights li {
    font-size: 14px;
  }

  .project-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .project-duration {
    font-size: 12px;
  }

  .company-name {
    font-size: 14px;
  }

  .tags,
  .project-links {
    gap: 6px;
  }

  .tag,
  .project-link {
    font-size: 12px;
    padding: 5px 10px;
  }


  .skill-category h3 {
    font-size: 18px;
  }

  .skill-category p {
    font-size: 14px;
  }

  .skill-badge {
    font-size: 13px;
    padding: 5px 12px;
  }

  .coursework-item {
    font-size: 13px;
    padding: 6px 12px;
  }


  .contact-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
  }

  .contact-info p {
    font-size: 16px;
  }

  .contact-method {
    padding: 16px;
  }

  .method-label {
    font-size: 12px;
  }

  .method-value {
    font-size: 15px;
  }

  .form-input,
  .form-textarea {
    font-size: 16px;
    /* Prevents zoom on iOS */
    padding: 14px;
  }

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


  footer {
    padding: 30px 0;
    font-size: 13px;
  }
}


@media (max-width: 480px) {
  .hero-title-main {
    font-size: 32px;
  }

  .hero-title-sub {
    font-size: 20px;
  }

  .hero-description {
    font-size: 15px;
  }

  h2 {
    font-size: 24px;
  }

  .hero-stats {
    gap: 20px;
  }

  .stat-value {
    font-size: 22px;
  }

  .hero-links {
    justify-content: center;
  }

  .hero-link-text {
    display: none;
  }

  .project-links {
    flex-direction: column;
  }

  .project-link {
    width: 100%;
    justify-content: center;
  }
}

.company-name {
  margin-bottom: 4px;
}

.experience-location {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.experience-location svg {
  color: var(--accent-primary);
}


#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 16px 24px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  border-left: 4px solid transparent;
  transform: translateX(120%);
  animation: slideIn 0.3s forwards;
  transition: all 0.3s ease;
}

.toast.hide {
  transform: translateX(120%);
  opacity: 0;
}

.toast.success {
  border-left-color: #10b981;
}

.toast.error {
  border-left-color: #ef4444;
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast.success .toast-icon {
  color: #10b981;
}

.toast.error .toast-icon {
  color: #ef4444;
}

@keyframes slideIn {
  from {
    transform: translateX(120%);
  }

  to {
    transform: translateX(0);
  }
}

[data-theme="dark"] .toast {
  background: var(--bg-tertiary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}