:root {
  --primary: 217 91% 60%;
  --primary-2: 258 90% 66%;
  --bg: 210 20% 98%;
  --fg: 222 30% 12%;
  --muted: 220 20% 94%;
  --muted-fg: 220 12% 42%;
  --card: 0 0% 100%;
  --border: 220 18% 88%;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.14);
  --glow: 0 0 0 1px hsl(var(--primary) / 0.38), 0 0 22px hsl(var(--primary) / 0.35), 0 0 42px hsl(var(--primary-2) / 0.28), 0 18px 44px hsl(var(--primary) / 0.22);
  --radius: 20px;
}

:root.dark {
  --primary: 217 90% 67%;
  --primary-2: 265 90% 72%;
  --bg: 222 25% 10%;
  --fg: 210 20% 96%;
  --muted: 222 18% 16%;
  --muted-fg: 220 12% 68%;
  --card: 222 20% 13%;
  --border: 222 14% 24%;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  height: 100%;
}

body {
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  margin: 0;
  padding-top: 70px;
  background:
    radial-gradient(circle at top left, hsl(var(--primary) / 0.08), transparent 30%),
    radial-gradient(circle at top right, hsl(var(--primary-2) / 0.08), transparent 28%),
    hsl(var(--bg));
  color: hsl(var(--fg));
  line-height: 1.65;
}

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

.container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section {
  padding: 5.5rem 0;
}

.section.alt {
  background: hsl(var(--muted) / 0.35);
  border-top: 1px solid hsl(var(--border) / 0.6);
  border-bottom: 1px solid hsl(var(--border) / 0.6);
}

.section-title {
  font-size: clamp(1.8rem, 1.3rem + 1.4vw, 2.4rem);
  font-weight: 800;
  margin: 0 0 2rem;
  letter-spacing: -0.03em;
  transition: transform 0.22s ease, text-shadow 0.22s ease, color 0.22s ease;
}

.section-title:hover {
  transform: translateY(-2px) scale(1.02);
  text-shadow: 0 0 18px hsl(var(--primary) / 0.35),
               0 0 30px hsl(var(--primary-2) / 0.22);
}

.section-note {
  margin-top: 1.25rem;
  color: hsl(var(--muted-fg));
  font-weight: 500;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: hsl(var(--bg) / 0.8);
  backdrop-filter: blur(12px);
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
  border-bottom: 1px solid hsl(var(--border));
}

.nav {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 800;
  text-decoration: none;
  color: hsl(var(--fg));
  padding: 0.5rem 0.75rem;
  border-radius: 12px;
  letter-spacing: -0.02em;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.brand:hover {
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.14) 0%,
    hsl(var(--primary-2) / 0.14) 100%
  );
  box-shadow: var(--glow);
  transform: translateY(-2px) scale(1.03);
}

.links {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.links a {
  color: hsl(var(--fg));
  text-decoration: none;
  padding: 0.55rem 0.8rem;
  border-radius: 12px;
  font-weight: 600;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.links a:hover {
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.14) 0%,
    hsl(var(--primary-2) / 0.14) 100%
  );
  box-shadow: var(--glow);
  transform: translateY(-2px) scale(1.04);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  border-radius: 12px;
  cursor: pointer;
}

.menu-toggle .bar {
  display: block;
  width: 22px;
  height: 2px;
  background: hsl(var(--fg));
  margin: 4px auto;
  border-radius: 999px;
  transition: 0.2s;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .links {
    position: absolute;
    top: 72px;
    right: 1rem;
    left: 1rem;
    padding: 0.85rem;
    background: hsl(var(--card));
    border: 1px solid hsl(var(--border));
    border-radius: 18px;
    box-shadow: var(--shadow-lg);
    display: none;
    flex-direction: column;
    gap: 0.25rem;
  }

  .links.open {
    display: flex;
  }

  .links li {
    width: 100%;
  }

  .links a,
  .theme-toggle {
    width: 100%;
  }
}

/* Theme toggle */
.theme-toggle {
  border: 1px solid hsl(var(--border));
  background: hsl(var(--card));
  color: hsl(var(--fg));
  padding: 0.55rem 0.75rem;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.theme-toggle:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.45);
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.08) 0%,
    hsl(var(--primary-2) / 0.08) 100%
  );
}

.theme-toggle .icon-sun {
  display: none;
}

:root.dark .theme-toggle .icon-sun {
  display: inline;
}

:root.dark .theme-toggle .icon-moon {
  display: none;
}

/* Hero */
.hero {
  min-height: calc(100vh - 70px);
  padding: 5rem 1.25rem 4rem;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 3rem;
  align-items: center;
}

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

.avatar {
  width: 300px;
  height: 360px;
  border-radius: 28px;
  object-fit: cover;
  border: 1px solid hsl(var(--border));
  box-shadow: var(--shadow-lg);
  background: hsl(var(--muted));
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.avatar:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.45);
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 0.8rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
  font-weight: 700;
  font-size: 0.92rem;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.eyebrow:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: var(--glow);
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.16) 0%,
    hsl(var(--primary-2) / 0.16) 100%
  );
}

.hero-copy h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2.3rem, 1.7rem + 2.2vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.grad {
  background: linear-gradient(
    90deg,
    hsl(var(--primary)) 0%,
    hsl(var(--primary-2)) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  color: hsl(var(--muted-fg));
  margin: 0.5rem 0 1.2rem;
  max-width: 680px;
  font-size: 1.05rem;
}

.cta-row {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin: 1.15rem 0 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.15rem;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.btn:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: var(--glow);
}

.btn-primary {
  background: linear-gradient(
    135deg,
    hsl(var(--primary)) 0%,
    hsl(var(--primary-2)) 100%
  );
  color: white;
  box-shadow: var(--shadow);
}

.btn-outline {
  background: hsl(var(--card));
  border-color: hsl(var(--border));
  color: hsl(var(--fg));
}

.btn-outline:hover {
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.12) 0%,
    hsl(var(--primary-2) / 0.12) 100%
  );
  border-color: hsl(var(--primary) / 0.45);
}

.btn-ghost {
  background: transparent;
  border-color: hsl(var(--border));
  color: hsl(var(--fg));
}

.btn-ghost:hover {
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.1) 0%,
    hsl(var(--primary-2) / 0.1) 100%
  );
  border-color: hsl(var(--primary) / 0.45);
}

.quick-contacts {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: hsl(var(--muted-fg));
  margin-bottom: 1.5rem;
}

.quick-contacts a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 0.22s ease, text-shadow 0.22s ease, transform 0.22s ease;
}

.quick-contacts a:hover {
  border-bottom-color: currentColor;
  color: hsl(var(--primary));
  text-shadow: 0 0 18px hsl(var(--primary) / 0.35);
  transform: translateY(-1px);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.stat {
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: 18px;
  padding: 1rem;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.stat:hover {
  transform: translateY(-6px) scale(1.04);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.6);
  background:
    linear-gradient(
      135deg,
      hsl(var(--primary) / 0.14) 0%,
      hsl(var(--primary-2) / 0.14) 100%
    ),
    hsl(var(--card));
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  margin-bottom: 0.2rem;
}

.stat span {
  color: hsl(var(--muted-fg));
  font-size: 0.94rem;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    min-height: auto;
    padding-top: 4rem;
  }

  .avatar {
    width: 260px;
    height: 310px;
    margin: 0 auto;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .quick-contacts,
  .cta-row {
    justify-content: center;
  }
}

/* About */
.about-card {
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.about-card:hover {
  transform: translateY(-4px) scale(1.015);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.45);
  background:
    linear-gradient(
      135deg,
      hsl(var(--primary) / 0.05) 0%,
      hsl(var(--primary-2) / 0.05) 100%
    ),
    hsl(var(--card));
}

.about-card p {
  margin: 0 0 1rem;
}

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

/* Cards / grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.6rem;
  align-items: stretch;
}

.card {
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
  box-shadow: var(--shadow);
  min-height: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.card > * {
  position: relative;
  z-index: 1;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent 20%,
    hsl(var(--primary) / 0.08) 45%,
    hsl(var(--primary-2) / 0.08) 55%,
    transparent 80%
  );
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
  z-index: 0;
}

.card:hover::before {
  opacity: 1;
}

.card:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.6);
  background:
    linear-gradient(
      135deg,
      hsl(var(--primary) / 0.12) 0%,
      hsl(var(--primary-2) / 0.12) 100%
    ),
    hsl(var(--card));
}

#experience .card,
#projects .card,
#education .card,
#activities .card {
  min-height: 250px;
}

#projects .card p,
#education .card p,
#experience .card p,
#activities .card p {
  margin-top: 0.45rem;
}

#experience .card ul {
  margin-top: 0.55rem;
}

#education .card p {
  padding-top: 0;
}

#education .card {
  min-height: 220px;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.9rem;
  margin-bottom: 0.2rem;
  flex-wrap: wrap;
}

.card h3 {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.35;
  word-break: break-word;
}

.card .org {
  color: hsl(var(--primary));
  margin: 0.1rem 0 0;
  font-weight: 700;
  line-height: 1.45;
}

.card .meta {
  color: hsl(var(--muted-fg));
  display: flex;
  gap: 0.45rem;
  white-space: normal;
  font-size: 0.95rem;
  flex-wrap: wrap;
  line-height: 1.45;
  text-align: right;
  margin: 0;
}

.card p {
  margin: 0.2rem 0 0;
  line-height: 1.7;
}

.bullets {
  margin: 0.7rem 0 0 1.2rem;
  padding: 0 0.2rem 0 0;
}

.description {
  line-height: 1.6;
  margin-top: 10px;
}

.bullets li {
  margin: 0.5rem 0;
  line-height: 1.65;
}

/* Chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.chip {
  padding: 0.6rem 0.85rem;
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: 999px;
  font-weight: 700;
  color: hsl(var(--fg));
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.chip:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.6);
  background:
    linear-gradient(
      135deg,
      hsl(var(--primary) / 0.14) 0%,
      hsl(var(--primary-2) / 0.14) 100%
    ),
    hsl(var(--card));
}

/* Skills */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.skill-col {
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.skill-col:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.6);
  background:
    linear-gradient(
      135deg,
      hsl(var(--primary) / 0.12) 0%,
      hsl(var(--primary-2) / 0.12) 100%
    ),
    hsl(var(--card));
}

.skill-col h3 {
  margin: 0.15rem 0 1rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.tag {
  padding: 0.42rem 0.72rem;
  background: hsl(var(--muted));
  border-radius: 10px;
  border: 1px solid hsl(var(--border));
  font-size: 0.92rem;
  font-weight: 600;
  color: hsl(var(--fg));
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.tag-button {
  color: hsl(var(--fg));
  background: hsl(var(--muted));
  border: 1px solid hsl(var(--border));
}

.tag-button:hover {
  color: hsl(var(--fg));
}

.tag:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.45);
  background: linear-gradient(
    135deg,
    hsl(var(--primary) / 0.08) 0%,
    hsl(var(--primary-2) / 0.08) 100%
  );
}

/* Footer */
.footer {
  margin-top: 0;
  border-top: 1px solid hsl(var(--border));
  background: hsl(var(--card));
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 0;
}

.foot-left h3 {
  margin: 0 0 0.25rem;
}

.foot-left p {
  margin: 0;
  color: hsl(var(--muted-fg));
}

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

.foot-links a {
  color: hsl(var(--fg));
  text-decoration: none;
  padding: 0.55rem 0.8rem;
  border: 1px solid hsl(var(--border));
  border-radius: 12px;
  background: hsl(var(--card));
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.foot-links a:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--glow);
  border-color: hsl(var(--primary) / 0.45);
  background:
    linear-gradient(
      135deg,
      hsl(var(--primary) / 0.08) 0%,
      hsl(var(--primary-2) / 0.08) 100%
    ),
    hsl(var(--card));
}

.copyright {
  text-align: center;
  color: hsl(var(--muted-fg));
  margin: 0;
  padding: 0 0 1.2rem;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }

  .card .meta {
    text-align: left;
  }
}

@media (max-width: 720px) {
  .section {
    padding: 4.5rem 0;
  }


  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}


/* Modal for coursework buttons */
.coursework-tags .tag-button,
.tag-button {
  cursor: pointer;
  font-family: inherit;
  appearance: none;
  -webkit-appearance: none;
}

.course-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 9999;
}

.course-modal.open {
  display: flex;
}

.course-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
}

.course-modal-content {
  position: relative;
  z-index: 10000;
  width: min(720px, 100%);
  background: hsl(var(--card));
  color: hsl(var(--fg));
  border: 1px solid hsl(var(--border));
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 0 0 1px hsl(var(--primary) / 0.25),
              0 0 24px hsl(var(--primary) / 0.2),
              0 0 48px hsl(var(--primary-2) / 0.18),
              0 24px 60px rgba(0, 0, 0, 0.35);
  opacity: 1;
  visibility: visible;
  transform: none;
}

.course-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 42px;
  height: 42px;
  border: 1px solid hsl(var(--border));
  border-radius: 999px;
  background: hsl(var(--card));
  color: hsl(var(--fg));
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.course-modal-code {
  margin: 0 0 8px;
  color: hsl(var(--primary));
  font-weight: 800;
  letter-spacing: 0.04em;
}

.course-modal-title {
  margin: 0 0 14px;
  color: hsl(var(--fg));
  font-size: 1.55rem;
  line-height: 1.2;
}

.course-modal-description {
  margin: 0;
  color: hsl(var(--fg));
  line-height: 1.75;
  white-space: normal;
}