/* ==========================================================
   Kushan Priyadasun — Portfolio
   ========================================================== */

:root {
  --bg: #f6f4ef;
  --bg-2: #efece4;
  --surface: #ffffff;
  --ink: #0f1729;
  --ink-2: #2b3445;
  --muted: #5d6676;
  --line: rgba(15, 23, 41, 0.1);
  --line-strong: rgba(15, 23, 41, 0.18);
  --accent: #0d7a6f;
  --accent-ink: #ffffff;
  --accent-soft: #d8eee9;
  --live: #16a34a;
  --dark-panel: #0f1729;
  --dark-panel-ink: #eef1f6;
  --shadow: 0 1px 2px rgba(15, 23, 41, 0.04), 0 8px 24px -12px rgba(15, 23, 41, 0.12);
  --shadow-lg: 0 30px 60px -30px rgba(15, 23, 41, 0.35);

  --serif: "Instrument Serif", ui-serif, Georgia, serif;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius: 22px;
  --radius-sm: 14px;
  --max: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0f17;
    --bg-2: #10151f;
    --surface: #141a26;
    --ink: #eef1f6;
    --ink-2: #cdd3dd;
    --muted: #949daf;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.16);
    --accent: #4fd1bf;
    --accent-ink: #062a25;
    --accent-soft: rgba(79, 209, 191, 0.12);
    --live: #4ade80;
    --dark-panel: #141c2c;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 30px 60px -30px rgba(0, 0, 0, 0.7);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0f17;
  --bg-2: #10151f;
  --surface: #141a26;
  --ink: #eef1f6;
  --ink-2: #cdd3dd;
  --muted: #949daf;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --accent: #4fd1bf;
  --accent-ink: #062a25;
  --accent-soft: rgba(79, 209, 191, 0.12);
  --live: #4ade80;
  --dark-panel: #141c2c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 30px 60px -30px rgba(0, 0, 0, 0.7);
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
em { font-family: var(--serif); font-style: italic; font-weight: 400; letter-spacing: -0.01em; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.container { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
.ico { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.muted { color: var(--muted); font-weight: 400; }

.skip-link { position: absolute; left: 16px; top: -60px; z-index: 100; background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 10px; }
.skip-link:focus { top: 16px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 48px; padding: 0 22px; border-radius: 999px;
  font: 500 15px/1 var(--sans); white-space: nowrap;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .2s ease, background-color .2s ease, border-color .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { filter: brightness(1.08); }
.btn-ink { background: var(--ink); color: var(--bg); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-sm { height: 38px; padding: 0 16px; font-size: 14px; }
.btn-sm .ico { width: 16px; height: 16px; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 999px;
  border: 1px solid var(--line); background: transparent; color: var(--ink);
  cursor: pointer; transition: background-color .2s ease;
}
.icon-btn:hover { background: var(--bg-2); }

/* ---------- Nav ---------- */
.nav-wrap { position: sticky; top: 0; z-index: 50; padding: 14px var(--gutter) 0; }
.nav {
  max-width: var(--max); margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 8px 8px 8px 14px; border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border: 1px solid transparent;
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  backdrop-filter: saturate(160%) blur(16px);
  transition: border-color .3s ease, box-shadow .3s ease;
}
.nav-wrap.scrolled .nav { border-color: var(--line); box-shadow: var(--shadow); }

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--ink); color: var(--bg); font-size: 13px; letter-spacing: .02em;
}
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  padding: 8px 14px; border-radius: 999px; font-size: 14.5px; color: var(--muted);
  transition: color .2s ease, background-color .2s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); background: var(--bg-2); }
.nav-actions { display: flex; align-items: center; gap: 8px; }

/* theme icon swap */
.ico-moon { display: none; }
:root[data-theme="dark"] .ico-sun { display: none; }
:root[data-theme="dark"] .ico-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .ico-sun { display: none; }
  :root:not([data-theme="light"]) .ico-moon { display: block; }
}

.menu-btn { display: none; position: relative; }
.menu-btn span { position: absolute; left: 11px; width: 14px; height: 1.6px; background: currentColor; border-radius: 2px; transition: transform .25s ease, top .25s ease; }
.menu-btn span:first-child { top: 15px; }
.menu-btn span:last-child { top: 21px; }
.menu-btn[aria-expanded="true"] span:first-child { top: 18px; transform: rotate(45deg); }
.menu-btn[aria-expanded="true"] span:last-child { top: 18px; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(32px, 5vw, 72px);
  align-items: center; padding-top: clamp(48px, 8vw, 96px); padding-bottom: 24px;
}
.status {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 14px 6px 10px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line);
  font-size: 13.5px; color: var(--ink-2); box-shadow: var(--shadow);
}
.dot { position: relative; width: 8px; height: 8px; border-radius: 50%; background: var(--live); }
.dot::after { content: ""; position: absolute; inset: -4px; border-radius: 50%; background: var(--live); opacity: .35; animation: ping 2s ease-out infinite; }
@keyframes ping { 0% { transform: scale(.6); opacity: .5; } 100% { transform: scale(1.8); opacity: 0; } }

.hero h1 {
  margin-top: 28px;
  font-size: clamp(56px, 9.5vw, 128px); line-height: .92; letter-spacing: -0.045em; font-weight: 600;
}
.hero h1 em { color: var(--accent); letter-spacing: -0.02em; font-size: 1.04em; }
.hero-roles { margin-top: 26px; font-size: clamp(16px, 1.6vw, 19px); font-weight: 500; color: var(--ink-2); }
.hero-roles span { color: var(--accent); margin: 0 6px; }
.hero-lead { margin-top: 16px; max-width: 34em; color: var(--muted); font-size: clamp(16px, 1.5vw, 18px); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.hero-photo { position: relative; margin: 0; }
.hero-photo img {
  width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: center 20%;
  border-radius: 28px; box-shadow: var(--shadow-lg);
}
.hero-photo::before {
  content: ""; position: absolute; inset: 18px -18px -18px 18px; z-index: -1;
  border-radius: 28px; background: var(--accent-soft);
}
.photo-chip {
  position: absolute; left: -20px; bottom: 28px;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 18px 12px 14px; border-radius: 16px;
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-lg);
}
.photo-chip .ico { color: var(--accent); width: 20px; height: 20px; }
.photo-chip span { display: grid; line-height: 1.3; }
.photo-chip b { font-size: 14px; font-weight: 600; }
.photo-chip small { font-size: 12.5px; color: var(--muted); }

.stats {
  grid-column: 1 / -1; margin: clamp(24px, 4vw, 48px) 0 0;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.stats > div { padding: 24px 20px; }
.stats > div + div { border-left: 1px solid var(--line); }
.stats dt { font-size: 13px; color: var(--muted); }
.stats dd { margin: 6px 0 0; font-size: clamp(22px, 2.6vw, 32px); font-weight: 600; letter-spacing: -0.03em; }
.stats dd small { font-size: .5em; font-weight: 500; color: var(--muted); letter-spacing: 0; }

/* ---------- Sections ---------- */
.section { padding-top: clamp(80px, 11vw, 140px); }
.section-head { display: grid; gap: 14px; margin-bottom: clamp(32px, 5vw, 56px); max-width: 760px; }
.kicker { font-size: 13px; font-weight: 500; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
.section-head h2, .contact h2 { font-size: clamp(36px, 5.4vw, 64px); letter-spacing: -0.04em; line-height: 1.02; }
.section-head h2 em, .contact h2 em { color: var(--muted); }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(32px, 6vw, 88px); }
.about-text { display: grid; gap: 18px; color: var(--muted); }
.about-text .lead { color: var(--ink); font-size: clamp(20px, 2.1vw, 26px); line-height: 1.4; letter-spacing: -0.015em; font-weight: 500; }
.values { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--line); }
.values li { padding: 24px 20px 24px 0; border-bottom: 1px solid var(--line); }
.values li:nth-child(odd) { padding-right: 24px; border-right: 1px solid var(--line); }
.values li:nth-child(even) { padding-left: 24px; }
.v-num { font-family: var(--serif); font-style: italic; color: var(--accent); font-size: 22px; }
.values h3 { margin-top: 8px; font-size: 18px; }
.values p { margin-top: 6px; font-size: 15px; color: var(--muted); }

/* ---------- Skills ---------- */
.bento { display: grid; grid-template-columns: 1.2fr 1fr; grid-template-rows: auto auto; gap: 16px; }
.card {
  padding: clamp(24px, 3vw, 36px); border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.card h3 { font-size: 22px; margin: 20px 0 22px; }
.card-icon { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 14px; background: var(--accent-soft); color: var(--accent); }
.card-icon .ico { width: 22px; height: 22px; }
.card-db { grid-row: span 2; background: var(--dark-panel); color: var(--dark-panel-ink); border-color: transparent; }
.card-db .card-icon { background: rgba(79, 209, 191, .14); color: #4fd1bf; }
.tech li {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 16px 0; border-top: 1px solid rgba(255, 255, 255, .09); font-size: 15.5px;
}
.lvl { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; font-weight: 500; color: rgba(238, 241, 246, .65); white-space: nowrap; }
.lvl::before { content: ""; width: 34px; height: 4px; border-radius: 4px; background: linear-gradient(90deg, #4fd1bf var(--fill), rgba(255,255,255,.12) var(--fill)); }
.lvl-3 { --fill: 100%; }
.lvl-2 { --fill: 70%; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span {
  padding: 8px 14px; border-radius: 999px; font-size: 14px;
  background: var(--accent-soft); color: var(--ink);
}
.tags-quiet span { background: transparent; border: 1px solid var(--line-strong); color: var(--ink-2); }

/* ---------- Experience ---------- */
.timeline { border-top: 1px solid var(--line); }
.job {
  display: grid; grid-template-columns: 220px 1fr; gap: 32px;
  padding: clamp(28px, 4vw, 44px) 0; border-bottom: 1px solid var(--line);
}
.job-when { font-size: 14px; color: var(--muted); padding-top: 4px; font-variant-numeric: tabular-nums; }
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px 5px 10px; border-radius: 999px; font-size: 13px; font-weight: 500; }
.pill-live { background: var(--accent-soft); color: var(--accent); }
.job-title h3 { font-size: clamp(22px, 2.4vw, 28px); letter-spacing: -0.025em; }
.job-title p { margin-top: 6px; color: var(--accent); font-weight: 500; font-size: 15.5px; }
.job-body > ul { margin-top: 18px; display: grid; gap: 8px; color: var(--muted); max-width: 46em; }
.job-body > ul li { position: relative; padding-left: 20px; font-size: 16px; }
.job-body > ul li::before { content: ""; position: absolute; left: 0; top: .72em; width: 8px; height: 1.5px; background: var(--line-strong); }
.job-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 18px; }
.job-tags span { font-size: 12.5px; padding: 4px 10px; border-radius: 8px; background: var(--bg-2); color: var(--ink-2); }

/* ---------- Credentials ---------- */
.creds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cred {
  display: flex; flex-direction: column; gap: 6px;
  padding: 26px; border-radius: var(--radius); background: var(--surface);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  transition: transform .25s ease, border-color .25s ease;
}
.cred:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.cred .ico { width: 26px; height: 26px; color: var(--accent); margin-bottom: 14px; }
.cred small { font-size: 12.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.cred h3 { font-size: 18px; line-height: 1.3; letter-spacing: -0.015em; }
.cred p { font-size: 14.5px; color: var(--muted); margin-top: auto; padding-top: 6px; }
.cred-edu { background: var(--accent-soft); border-color: transparent; box-shadow: none; }

/* ---------- Gallery ---------- */
.gallery { display: grid; grid-template-columns: 1.3fr 1fr 1.3fr; gap: 16px; align-items: center; }
.gallery figure { margin: 0; overflow: hidden; border-radius: var(--radius); }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .8s cubic-bezier(.2,.7,.2,1); }
.gallery figure:nth-child(2) img { aspect-ratio: 4 / 5; object-position: center 20%; }
.gallery figure:hover img { transform: scale(1.04); }

/* ---------- Contact ---------- */
.contact {
  position: relative; overflow: hidden;
  padding: clamp(36px, 7vw, 88px); border-radius: 32px;
  background: var(--dark-panel); color: var(--dark-panel-ink);
}
.contact::after {
  content: ""; position: absolute; width: 520px; height: 520px; right: -160px; top: -200px;
  border-radius: 50%; background: radial-gradient(circle, rgba(79,209,191,.28), transparent 65%);
  pointer-events: none;
}
.kicker-light { color: #4fd1bf; }
.contact h2 { margin-top: 16px; max-width: 12em; }
.contact h2 em { color: rgba(238, 241, 246, .55); }
.contact > p { margin-top: 18px; max-width: 32em; color: rgba(238, 241, 246, .7); }

.contact-mail { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 40px; }
.mail-link {
  font-size: clamp(20px, 3.6vw, 40px); font-weight: 500; letter-spacing: -0.03em;
  overflow-wrap: anywhere;
  background: linear-gradient(currentColor, currentColor) left bottom / 0 1.5px no-repeat;
  transition: background-size .35s ease;
}
.mail-link:hover { background-size: 100% 1.5px; }
.copy-btn {
  display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 14px;
  border-radius: 999px; border: 1px solid rgba(255,255,255,.18); background: transparent;
  color: inherit; font: 500 13.5px var(--sans); cursor: pointer;
}
.copy-btn:hover { background: rgba(255,255,255,.07); }
.copy-btn .ico { width: 15px; height: 15px; }
.copy-btn .ico-check { display: none; color: #4fd1bf; }
.copy-btn.copied .ico-copy { display: none; }
.copy-btn.copied .ico-check { display: block; }

.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 40px; }
.contact-grid > * {
  display: flex; align-items: center; gap: 14px; padding: 18px;
  border-radius: 16px; background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.08);
  transition: background-color .2s ease;
}
.contact-grid a:hover { background: rgba(255,255,255,.09); }
.contact-grid .ico { color: #4fd1bf; width: 20px; height: 20px; }
.contact-grid span { display: grid; font-size: 15px; font-weight: 500; }
.contact-grid small { font-size: 12.5px; font-weight: 400; color: rgba(238, 241, 246, .55); }

/* ---------- Footer ---------- */
.footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  padding-top: 40px; padding-bottom: 40px; font-size: 14px; color: var(--muted);
}
.footer a:hover { color: var(--ink); }

/* ---------- Reveal on scroll ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); transition-delay: var(--d, 0s); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .dot::after { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .nav-links {
    position: absolute; top: calc(100% + 8px); left: var(--gutter); right: var(--gutter);
    flex-direction: column; gap: 2px; padding: 10px; border-radius: 20px;
    background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-lg);
    opacity: 0; visibility: hidden; transform: translateY(-6px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
  }
  .nav-links.open { opacity: 1; visibility: visible; transform: none; }
  .nav-links a { padding: 14px 16px; font-size: 16px; color: var(--ink); }
  .menu-btn { display: inline-grid; }

  .hero { grid-template-columns: 1fr; }
  .hero-photo { max-width: 440px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats > div:nth-child(3) { border-left: 0; }
  .stats > div:nth-child(n+3) { border-top: 1px solid var(--line); }

  .about { grid-template-columns: 1fr; }
  .bento { grid-template-columns: 1fr; }
  .card-db { grid-row: auto; }
  .creds { grid-template-columns: repeat(2, 1fr); }
  .job { grid-template-columns: 1fr; gap: 12px; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .brand-name { display: none; }
  .hero-photo { margin-right: 18px; }
  .photo-chip { left: 12px; bottom: 14px; }
  .hero-cta .btn { flex: 1 1 auto; justify-content: center; }
  .values { grid-template-columns: 1fr; }
  .values li:nth-child(odd), .values li:nth-child(even) { padding: 20px 0; border-right: 0; }
  .creds { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .gallery figure:nth-child(2) { grid-column: 1 / -1; grid-row: 1; }
  .tech li { flex-direction: column; align-items: flex-start; gap: 6px; }
}