:root {
  --black: #1d1d1f;
  --gray-dark: #424245;
  --gray-mid: #6e6e73;
  --gray-light: #86868b;
  --gray-rule: #d2d2d7;
  --gray-bg: #f5f5f7;
  --white: #fbfbfd;
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  color: var(--black);
  background: var(--white);
  line-height: 1.5;
  font-size: 17px;
  overflow-x: hidden;
}

::selection {
  background: var(--blue);
  color: #fff;
}

/* ========================================
   NAV — frosted glass + scroll shadow
   ======================================== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(251, 251, 253, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--gray-rule);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

nav.scrolled {
  background: rgba(251, 251, 253, 0.92);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}

nav .nav-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 22px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav .nav-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--black);
  letter-spacing: -0.01em;
}

nav .nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

nav .nav-links a {
  font-size: 12px;
  font-weight: 400;
  color: var(--gray-mid);
  text-decoration: none;
  letter-spacing: 0.01em;
  position: relative;
  transition: color 0.2s;
}

nav .nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--blue);
  transition: width 0.3s ease;
}

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

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

nav .nav-links a.active {
  color: var(--black);
  font-weight: 500;
}

nav .nav-links a.active::after {
  width: 100%;
}

/* ========================================
   SECTIONS — shared
   ======================================== */
.section {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 22px;
}

/* ========================================
   HERO — cinematic entrance
   ======================================== */
.hero {
  padding-top: 140px;
  padding-bottom: 80px;
  text-align: center;
}

.hero-overline {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-light);
  letter-spacing: 0.02em;
  margin-bottom: 12px;
  opacity: 0;
  transform: translateY(12px);
  animation: hero-fade-up 0.8s ease 0.2s forwards;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.07;
  color: var(--black);
  margin-bottom: 20px;
  opacity: 0;
  transform: translateY(20px);
  animation: hero-fade-up 0.9s ease 0.4s forwards;
}

.hero p {
  font-size: 21px;
  font-weight: 400;
  color: var(--gray-dark);
  line-height: 1.47;
  max-width: 600px;
  margin: 0 auto 32px;
  letter-spacing: 0.01em;
  opacity: 0;
  transform: translateY(16px);
  animation: hero-fade-up 0.9s ease 0.6s forwards;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  opacity: 0;
  animation: hero-fade-up 0.9s ease 0.8s forwards;
}

.hero-links a {
  font-size: 17px;
  font-weight: 400;
  color: var(--blue);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s, transform 0.2s;
}

.hero-links a:hover {
  color: var(--blue-hover);
  transform: translateX(2px);
}

.hero-links a .arrow {
  font-size: 14px;
  display: inline-block;
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.hero-links a:hover .arrow {
  transform: translateX(4px);
}

@keyframes hero-fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   DIVIDER
   ======================================== */
.divider {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 22px;
}

.divider hr {
  border: none;
  border-top: 0.5px solid var(--gray-rule);
}

/* ========================================
   CONTENT SECTIONS
   ======================================== */
.content-section {
  padding-top: 64px;
  padding-bottom: 64px;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gray-light);
  margin-bottom: 32px;
}

/* ========================================
   SCROLL ANIMATIONS — fade + stagger
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

/* Stagger children: each .role / .skill-category gets a delay */
.fade-in.stagger-1 { transition-delay: 0.08s; }
.fade-in.stagger-2 { transition-delay: 0.16s; }
.fade-in.stagger-3 { transition-delay: 0.24s; }
.fade-in.stagger-4 { transition-delay: 0.32s; }
.fade-in.stagger-5 { transition-delay: 0.40s; }
.fade-in.stagger-6 { transition-delay: 0.48s; }

/* Slide-in from left */
.slide-in-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Scale-in for project cards */
.scale-in {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ========================================
   EXPERIENCE
   ======================================== */
.role {
  margin-bottom: 48px;
  padding-left: 20px;
  border-left: 2px solid transparent;
  transition: border-color 0.4s ease;
}

.role:last-child {
  margin-bottom: 0;
}

.role.visible {
  border-left-color: var(--gray-rule);
}

.role:hover {
  border-left-color: var(--blue);
}

.role-header {
  margin-bottom: 16px;
}

.role-company {
  font-size: 24px;
  font-weight: 600;
  color: var(--black);
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.role-title {
  font-size: 17px;
  font-weight: 400;
  color: var(--gray-dark);
  margin-top: 2px;
}

.role-meta {
  font-size: 14px;
  font-weight: 400;
  color: var(--gray-light);
  margin-top: 4px;
}

.role ul {
  list-style: none;
  padding: 0;
}

.role li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--gray-dark);
  line-height: 1.53;
  margin-bottom: 8px;
}

.role li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gray-light);
  transition: background 0.2s, transform 0.2s;
}

.role:hover li::before {
  background: var(--blue);
  transform: scale(1.3);
}

/* ========================================
   SKILLS
   ======================================== */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 48px;
}

.skill-category h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 8px;
  letter-spacing: -0.005em;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 400;
  color: var(--gray-dark);
  background: var(--gray-bg);
  padding: 4px 12px;
  border-radius: 980px;
  letter-spacing: 0.005em;
  cursor: default;
  opacity: 0;
  transform: translateY(8px) scale(0.95);
  transition: opacity 0.4s ease, transform 0.4s ease,
    background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.skill-tag.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.skill-tag:hover {
  background: var(--black);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transform: translateY(-1px) scale(1.04);
}

/* ========================================
   EDUCATION
   ======================================== */
.edu-entry {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
}

.edu-degree {
  font-size: 17px;
  font-weight: 600;
  color: var(--black);
}

.edu-school {
  font-size: 15px;
  color: var(--gray-dark);
  margin-top: 2px;
}

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

/* ========================================
   PROJECTS — card hover + stagger
   ======================================== */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.project-card {
  background: var(--gray-bg);
  border-radius: 18px;
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    box-shadow 0.4s ease;
}

.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  border: 1px solid transparent;
  transition: border-color 0.3s ease;
  pointer-events: none;
}

.project-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.project-card:hover::before {
  border-color: var(--gray-rule);
}

.project-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 6px;
}

.project-card .project-tech {
  font-size: 12px;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.project-card p {
  font-size: 14px;
  color: var(--gray-dark);
  line-height: 1.47;
}

/* ========================================
   QR CODE — share section
   ======================================== */
.qr-section {
  text-align: center;
}

.qr-pair {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.qr-card {
  background: var(--gray-bg);
  border-radius: 24px;
  padding: 32px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    box-shadow 0.4s ease;
}

.qr-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.qr-card canvas {
  border-radius: 12px;
  image-rendering: pixelated;
}

.qr-hint {
  font-size: 13px;
  color: var(--gray-light);
  letter-spacing: 0.01em;
}

.qr-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.qr-actions button {
  font-family: var(--font);
  font-size: 15px;
  font-weight: 400;
  padding: 10px 24px;
  border-radius: 980px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.qr-download {
  background: var(--blue);
  color: #fff;
}

.qr-download:hover {
  background: var(--blue-hover);
  transform: translateY(-1px);
}

.qr-actions .arrow {
  font-size: 14px;
  transition: transform 0.2s;
}

.qr-download:hover .arrow {
  transform: translateY(2px);
}

/* ========================================
   FOOTER
   ======================================== */
footer {
  text-align: center;
  padding: 40px 22px 48px;
  font-size: 13px;
  color: var(--gray-light);
}

footer a {
  color: var(--blue);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 734px) {
  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: 18px;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  nav .nav-links {
    gap: 16px;
  }

  nav .nav-links a {
    font-size: 11px;
  }

  .role-company {
    font-size: 20px;
  }

  .role {
    padding-left: 16px;
  }

  .qr-card {
    padding: 24px;
  }

  .qr-pair {
    gap: 32px;
  }
}

/* ========================================
   PRINT
   ======================================== */
@media print {
  nav { display: none; }

  .hero { padding-top: 40px; padding-bottom: 40px; }

  .content-section { padding-top: 24px; padding-bottom: 24px; }

  .fade-in,
  .slide-in-left,
  .scale-in,
  .skill-tag {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .project-card { break-inside: avoid; }

  .role {
    break-inside: avoid;
    border-left-color: var(--gray-rule) !important;
  }

  .skill-tag:hover {
    background: var(--gray-bg);
    color: var(--gray-dark);
    box-shadow: none;
  }

  .qr-section { padding-top: 20px; padding-bottom: 20px; }

  .qr-actions { display: none; }

  .qr-card {
    background: none;
    padding: 16px;
    box-shadow: none;
  }

  body { font-size: 12px; }

  .hero h1 { font-size: 32px; }
}