/* Variables */
:root {
  color-scheme: light dark;

  /* fixed colors, same in both modes */
  --ink: #0e1030;
  --ink-light: #171a47;
  --gold: #ffc65c;
  --violet: #9a8cff;

  /* theme colors, light by default */
  --paper: #f4f6fc;
  --surface: #fff;
  --heading: #0e1030;
  --text: #1b1d3a;
  --muted: #5d6288;
  --border: #dfe3f3;
  --btn-border: #c9cef0;
  --btn-hover: #fff;
  --primary-bg: #0e1030;
  --primary-text: #fff;
  --primary-hover: #171a47;
  --tag-bg: #eceffd;
  --tag-text: #3a3f94;
  --badge-bg: #fff1d3;
  --badge-text: #8a5a00;
  --nav-bg: rgba(244, 246, 252, 0.78);
  --nav-border: rgba(27, 29, 58, 0.07);
  --glow-violet: rgba(154, 140, 255, 0.22);
  --glow-gold: rgba(255, 198, 92, 0.28);
  --panel-border: transparent;

  --font-display: 'Bricolage Grotesque', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

/* Dark mode follows the browser or OS setting */
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #090b21;
    --surface: #12153d;
    --heading: #fff;
    --text: #e4e6ff;
    --muted: #a3a8d8;
    --border: #262a60;
    --btn-border: #3a3f86;
    --btn-hover: #1a1e52;
    --primary-bg: #ffc65c;
    --primary-text: #0e1030;
    --primary-hover: #ffd689;
    --tag-bg: #232768;
    --tag-text: #cfd2ff;
    --badge-bg: rgba(255, 198, 92, 0.16);
    --badge-text: #ffd689;
    --nav-bg: rgba(9, 11, 33, 0.78);
    --nav-border: rgba(255, 255, 255, 0.08);
    --glow-violet: rgba(154, 140, 255, 0.18);
    --glow-gold: rgba(255, 198, 92, 0.08);
    --panel-border: rgba(255, 255, 255, 0.1);
  }
}

/* Base */
* {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font: 400 17px/1.65 var(--font-body);
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
  border-radius: 6px;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

.section {
  padding: 110px 0;
}

h2 {
  font: 650 clamp(40px, 5.5vw, 68px) / 1 var(--font-display);
  letter-spacing: -0.035em;
  color: var(--heading);
  margin-bottom: 56px;
}

/* Buttons */
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 20px;
  border: 1px solid var(--btn-border);
  border-radius: 99px;
  color: var(--heading);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.25s, transform 0.25s;
}

.btn:hover {
  background: var(--btn-hover);
  transform: translateY(-2px);
}

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

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

.icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  padding: 0;
  list-style: none;
}

.tags li {
  padding: 4px 12px;
  border-radius: 99px;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 13px;
  font-weight: 700;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 28px;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

nav .logo {
  font: 700 19px var(--font-display);
  letter-spacing: -0.02em;
  color: var(--heading);
  text-decoration: none;
}

nav ul {
  display: flex;
  gap: 4px;
  padding: 0;
  list-style: none;
}

nav ul a {
  display: block;
  padding: 7px 14px;
  border-radius: 99px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

nav ul a:hover {
  color: var(--heading);
}

nav ul a.active {
  background: var(--primary-bg);
  color: var(--primary-text);
}

/* Hero */
.hero {
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 110px 0 70px;
  background:
    radial-gradient(60% 50% at 8% 0%, var(--glow-violet), rgba(154, 140, 255, 0) 70%),
    radial-gradient(50% 45% at 100% 100%, var(--glow-gold), rgba(255, 198, 92, 0) 70%),
    var(--paper);
}

.hero-grid > * {
  min-width: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 56px;
  align-items: center;
  width: 100%;
}

.hero h1 {
  font: 700 clamp(46px, 6.4vw, 92px) / 0.98 var(--font-display);
  letter-spacing: -0.045em;
  color: var(--heading);
}

.hero-text p {
  max-width: 460px;
  margin: 26px 0 32px;
  font-size: 19px;
  color: var(--muted);
}

.hero-text p a {
  color: var(--heading);
  text-decoration-color: var(--violet);
  text-underline-offset: 4px;
}

/* Simulation panel */
.panel {
  padding: 22px 22px 20px;
  border-radius: 26px;
  background: var(--ink);
  color: #fff;
  border: 1px solid var(--panel-border);
  box-shadow: 0 40px 80px -30px rgba(30, 32, 110, 0.55);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 6px;
}

.panel-header strong {
  display: block;
  font: 650 18px var(--font-display);
}

.panel-header span {
  font-size: 13px;
  color: #9aa0dd;
}

.panel-stat {
  flex-shrink: 0;
  text-align: right;
}

.panel-stat strong {
  font-size: 30px;
  letter-spacing: -0.03em;
  color: var(--gold);
}

#sim {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(240px, 38vh, 380px);
  cursor: crosshair;
  touch-action: pan-y;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 18px;
  align-items: end;
  margin-top: 14px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.controls label {
  display: block;
  font-size: 13px;
  color: #b6bbee;
}

.controls output {
  float: right;
  color: #fff;
  font-weight: 700;
}

.controls input {
  width: 100%;
  margin-top: 8px;
  accent-color: var(--gold);
}

.controls button {
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 99px;
  background: transparent;
  color: #fff;
  font: 700 14px var(--font-body);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.controls button:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
}

/* Experience */
.timeline {
  position: relative;
  padding-left: 44px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--violet), var(--border));
}

.job {
  position: relative;
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 26px;
  margin-bottom: 28px;
  padding: 30px 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  transition: box-shadow 0.3s, transform 0.3s;
}

.job:hover {
  box-shadow: 0 24px 50px -24px rgba(40, 44, 140, 0.35);
  transform: translateY(-3px);
}

/* dot on the timeline line */
.job::before {
  content: '';
  position: absolute;
  left: -36px;
  top: 42px;
  width: 14px;
  height: 14px;
  border: 3px solid var(--violet);
  border-radius: 50%;
  background: var(--paper);
}

.job.current::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 7px rgba(255, 198, 92, 0.28);
}

.job img {
  width: 76px;
  height: 76px;
  border: 1px solid var(--border);
  border-radius: 18px;
  object-fit: cover;
}

.job h3 {
  font: 650 25px / 1.2 var(--font-display);
}

.job .org {
  margin: 4px 0 14px;
  color: var(--muted);
  font-weight: 500;
}

.job ul:not(.tags) {
  padding-left: 20px;
}

.job li {
  margin: 5px 0;
}

.job li::marker {
  color: var(--violet);
}

.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 10px;
  border-radius: 99px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font: 700 12px var(--font-body);
  vertical-align: middle;
}

/* Projects */
.dark {
  background: var(--ink);
  color: #fff;
}

.dark h2 {
  color: #fff;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}

.project {
  position: relative;
  grid-column: span 2;
  display: flex;
  flex-direction: column;
  padding: 28px;
  overflow: hidden;
  background: var(--ink-light);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 22px;
  transition: transform 0.3s, border-color 0.3s;
}

/* rows of 4+2, 2+4, 3+3 so every row fills the grid */
.project:nth-child(1),
.project:nth-child(4) {
  grid-column: span 4;
}

.project:nth-child(5),
.project:nth-child(6) {
  grid-column: span 3;
}

/* glow that follows the cursor, position is set in main.js */
.project::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: radial-gradient(300px circle at var(--x, 50%) var(--y, 0%), rgba(154, 140, 255, 0.22), rgba(154, 140, 255, 0) 70%);
  opacity: 0;
  transition: opacity 0.3s;
}

.project:hover {
  transform: translateY(-4px);
  border-color: rgba(154, 140, 255, 0.5);
}

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

.project > * {
  position: relative;
}

.project-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 22px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--violet), #6fe3ff);
  color: var(--ink);
}

.project-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.project h3 {
  margin-bottom: 10px;
  font: 650 23px / 1.2 var(--font-display);
}

.project p {
  flex: 1;
  color: #bfc4f0;
  font-size: 15.5px;
}

.project .tags {
  margin-top: 20px;
}

.project .tags li {
  background: rgba(255, 255, 255, 0.09);
  color: #dfe2ff;
}

/* Skills */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.skill {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
}

.skill h3 {
  margin-bottom: 16px;
  font: 650 22px var(--font-display);
}

.skill .tags {
  margin: 0;
}

.skill .tags li {
  transition: background 0.2s, color 0.2s;
}

.skill .tags li:hover {
  background: var(--primary-bg);
  color: var(--primary-text);
}

/* Footer */
footer {
  padding: 100px 0 56px;
  background: linear-gradient(160deg, var(--ink-light), var(--ink));
  color: #fff;
  text-align: center;
}

footer h2 {
  margin-bottom: 18px;
  color: #fff;
}

footer p {
  margin-bottom: 32px;
  color: #b6bbee;
}

footer .button-row {
  justify-content: center;
}

footer .btn {
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}

footer .btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

footer .btn-primary {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
}

footer .btn-primary:hover {
  background: #ffd689;
  border-color: #ffd689;
}

footer small {
  display: block;
  margin-top: 72px;
  color: #7c82bf;
  font-size: 13px;
}

/* Animations */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
}

.hero h1,
.hero-text p,
.hero .button-row,
.panel {
  animation: fade-up 1s both cubic-bezier(0.2, 0.7, 0.2, 1);
}

.hero-text p { animation-delay: 0.2s; }
.hero .button-row { animation-delay: 0.35s; }
.panel { animation-delay: 0.3s; }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s, transform 0.8s;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Responsive */
@media (max-width: 860px) {
  .section {
    padding: 80px 0;
  }

  nav ul a {
    padding: 6px 10px;
    font-size: 13px;
  }

  .hero {
    padding-top: 96px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .controls button {
    grid-column: 1 / -1;
  }

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

  .project,
  .project:nth-child(n) {
    grid-column: auto;
  }

  .timeline {
    padding-left: 30px;
  }

  .timeline::before {
    left: 7px;
  }

  .job {
    grid-template-columns: 1fr;
    padding: 24px;
  }

  .job::before {
    left: -30px;
  }

  .job img {
    width: 60px;
    height: 60px;
  }
}

@media (max-width: 520px) {
  nav {
    justify-content: center;
  }

  nav .logo {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}