/* ========================================
   DESIGN SYSTEM — Terminal Elegance
   ======================================== */

:root {
  /* Dark mode (default) */
  --bg-primary:    #0f1117;
  --bg-secondary:  #1a1d27;
  --bg-elevated:   #242836;
  --text-primary:  #e4e6ed;
  --text-secondary:#8b90a0;
  --accent:        #4f8ff7;
  --accent-hover:  #6ba3ff;
  --accent-glow:   rgba(79, 143, 247, 0.12);
  --border:        #2a2e3a;
  --tag-bg:        #1e2a3a;
  --dot-color:     #2a2e3a;

  /* Spacing */
  --nav-height:    64px;
  --section-pad:   clamp(4rem, 8vw, 7rem);
  --container-max: 1100px;

  /* Transitions */
  --transition:    0.3s ease;
}

[data-theme="light"] {
  --bg-primary:    #fafbfc;
  --bg-secondary:  #ffffff;
  --bg-elevated:   #f0f2f5;
  --text-primary:  #1a1d27;
  --text-secondary:#6b7280;
  --accent:        #2563eb;
  --accent-hover:  #1d4ed8;
  --accent-glow:   rgba(37, 99, 235, 0.08);
  --border:        #e5e7eb;
  --tag-bg:        #eff6ff;
  --dot-color:     #d1d5db;
}

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

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85em;
}

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

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

ul {
  list-style: none;
}

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

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--transition);
}

[data-theme="light"] .nav {
  background: rgba(250, 251, 252, 0.85);
}

.nav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav__logo:hover {
  color: var(--accent);
}

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

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  transition: color var(--transition), border-color var(--transition);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

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

/* ========================================
   HERO
   ======================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-height) + 2rem) 2rem 4rem;
}

/* Grid dot pattern */
.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--dot-color) 1px, transparent 1px);
  background-size: 30px 30px;
  opacity: 0.5;
  pointer-events: none;
}

.hero__content {
  position: relative;
  max-width: var(--container-max);
  width: 100%;
  z-index: 1;
}

.hero__greeting {
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.hero__name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.hero__title {
  font-size: clamp(1.2rem, 3vw, 1.75rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

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

.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero__ctas {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero__keywords {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.8;
  max-width: 600px;
}

.hero__chips {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  border: 1px solid transparent;
}

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

.btn--primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

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

.btn--secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Chips */
.chip {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
}

/* ========================================
   SECTIONS (shared)
   ======================================== */

.section {
  padding: var(--section-pad) 2rem;
}

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

.section__container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* Fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   ABOUT
   ======================================== */

.about__content {
  display: grid;
  gap: 3rem;
}

.about__text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  max-width: 700px;
}

.about__text p:last-child {
  margin-bottom: 0;
}

.about__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.about__card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.about__card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.about__card-icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.about__card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.about__card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   EXPERIENCE TIMELINE
   ======================================== */

.timeline {
  position: relative;
  padding-left: 2rem;
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline__item {
  position: relative;
  padding-bottom: 2.5rem;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-primary);
  z-index: 1;
}

.section:nth-child(even) .timeline__dot {
  border-color: var(--bg-secondary);
}

.timeline__header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.25rem;
}

.timeline__header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.timeline__company {
  color: var(--accent);
  font-size: 0.9rem;
}

.timeline__date {
  color: var(--text-secondary);
  font-size: 0.8rem;
  display: block;
  margin-bottom: 0.75rem;
}

.timeline__details {
  list-style: disc;
  padding-left: 1.2rem;
}

.timeline__details li {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

/* ========================================
   SKILLS
   ======================================== */

.skills__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.skills__group {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.skills__group-title {
  color: var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  font-weight: 500;
}

.skills__group li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
}

.skills__group li:last-child {
  border-bottom: none;
}

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

.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.project-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-card__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1rem;
}

.project-card__tech {
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: block;
}

.project-card__link {
  font-size: 0.85rem;
  font-weight: 500;
}

/* ========================================
   EDUCATION
   ======================================== */

.education__content {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  max-width: 700px;
}

.education__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.education__header h3 {
  font-size: 1.15rem;
}

.education__header .mono {
  color: var(--text-secondary);
}

.education__degree {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.education__details {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.education__note {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

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

.contact {
  padding: var(--section-pad) 2rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

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

.contact__text {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.contact__links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.contact__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-primary);
  padding: 1rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  transition: color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.contact__link .mono {
  color: var(--accent);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact__link:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.contact__footer {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
}

.contact__footer p {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

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

@media (max-width: 1024px) {
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  /* Navigation */
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1.25rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav__links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  /* About */
  .about__cards {
    grid-template-columns: 1fr;
  }

  /* Skills */
  .skills__grid {
    grid-template-columns: 1fr;
  }

  /* Projects */
  .projects__grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact__links {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  /* Education */
  .education__header {
    flex-direction: column;
  }

  /* Timeline */
  .timeline {
    padding-left: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero__ctas {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }

  .hero__chips {
    justify-content: flex-start;
  }
}

/* ========================================
   PRINT LAYOUT — 2-page resume
   ======================================== */

@media print {
  /* Reset colors and backgrounds */
  *, *::before, *::after {
    color: #1a1a1a !important;
    background: white !important;
    box-shadow: none !important;
    text-shadow: none !important;
    border-color: #ccc !important;
  }

  body {
    font-size: 10pt;
    line-height: 1.4;
  }

  /* Page setup */
  @page {
    size: letter;
    margin: 0.5in 0.6in;
  }

  /* Hide non-resume elements */
  .nav,
  .hero__grid-bg,
  .hero__ctas,
  .hero__greeting,
  .contact__footer,
  .contact__text,
  .project-card__link,
  .about__card-icon,
  .fade-in {
    opacity: 1 !important;
    transform: none !important;
  }

  .nav,
  .hero__grid-bg,
  .hero__ctas {
    display: none !important;
  }

  /* Hero → Resume header */
  .hero {
    min-height: auto;
    padding: 0;
    text-align: center;
    border-bottom: 2px solid #1a1a1a;
    padding-bottom: 8pt;
    margin-bottom: 4pt;
  }

  .hero__name {
    font-size: 20pt;
    margin-bottom: 2pt;
  }

  .hero__title {
    font-size: 11pt;
    margin-bottom: 4pt;
  }

  .hero__tagline {
    font-size: 9pt;
    max-width: none;
    margin-bottom: 6pt;
  }

  .hero__keywords {
    font-size: 8pt;
    text-align: center;
    max-width: none;
  }

  .chip {
    font-size: 7pt;
    padding: 1pt 6pt;
    border: 1px solid #999;
  }

  /* Sections — tight spacing */
  .section {
    padding: 6pt 0;
  }

  .section__container {
    max-width: none;
  }

  .section__title {
    font-size: 12pt;
    margin-bottom: 6pt;
    border-bottom: 1px solid #ccc;
    padding-bottom: 2pt;
    display: block;
  }

  .section__title::after {
    display: none;
  }

  /* About — compact */
  .about__text p {
    font-size: 9pt;
    margin-bottom: 4pt;
    max-width: none;
  }

  .about__cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 6pt;
    margin-top: 6pt;
  }

  .about__card {
    padding: 6pt 8pt;
    border: 1px solid #ccc;
  }

  .about__card-icon {
    display: none;
  }

  .about__card h3 {
    font-size: 9pt;
    margin-bottom: 2pt;
  }

  .about__card p {
    font-size: 8pt;
  }

  /* Experience — dense timeline */
  .timeline {
    padding-left: 0;
  }

  .timeline::before {
    display: none;
  }

  .timeline__dot {
    display: none;
  }

  .timeline__item {
    padding-bottom: 8pt;
  }

  .timeline__header h3 {
    font-size: 10pt;
  }

  .timeline__company {
    font-size: 9pt;
  }

  .timeline__date {
    font-size: 8pt;
    margin-bottom: 2pt;
  }

  .timeline__details {
    padding-left: 14pt;
  }

  .timeline__details li {
    font-size: 9pt;
    margin-bottom: 1pt;
    line-height: 1.35;
  }

  /* Skills — 4 columns, compact */
  .skills__grid {
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 6pt;
  }

  .skills__group {
    padding: 6pt 8pt;
    border: 1px solid #ccc;
  }

  .skills__group-title {
    font-size: 8pt;
    margin-bottom: 4pt;
  }

  .skills__group li {
    font-size: 8pt;
    padding: 1pt 0;
  }

  /* Projects — 2 columns, condensed */
  .projects__grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 6pt;
  }

  .project-card {
    padding: 6pt 8pt;
    border: 1px solid #ccc;
  }

  .project-card__title {
    font-size: 9pt;
  }

  .project-card__desc {
    font-size: 8pt;
    margin-bottom: 2pt;
  }

  .project-card__tech {
    font-size: 7pt;
    margin-bottom: 0;
  }

  .project-card__link {
    display: none !important;
  }

  /* Education — inline */
  .education__content {
    padding: 8pt;
    border: 1px solid #ccc;
  }

  .education__header h3 {
    font-size: 10pt;
  }

  .education__degree {
    font-size: 9pt;
    margin-bottom: 4pt;
  }

  .education__details .chip {
    font-size: 7pt;
  }

  /* Contact — single line at bottom */
  .contact {
    padding: 8pt 0;
    border-top: 1px solid #ccc;
  }

  .contact .section__title {
    display: none;
  }

  .contact__text {
    display: none;
  }

  .contact__links {
    flex-direction: row;
    justify-content: center;
    gap: 16pt;
    margin-bottom: 0;
  }

  .contact__link {
    flex-direction: row;
    font-size: 8pt;
    gap: 3pt;
  }

  .contact__link .mono {
    font-size: 7pt;
  }

  .contact__footer {
    display: none;
  }

  /* Prevent awkward page breaks */
  .timeline__item,
  .project-card,
  .skills__group,
  .education__content {
    break-inside: avoid;
  }

  .experience {
    break-before: avoid;
  }
}