/*
  Nazmul Mridha - Portfolio
  Single stylesheet. Sections: tokens > base > layout > nav > hero > sections > projects > contact > footer > lightbox > responsive
*/

/* ---------- Fonts (self-hosted, latin subset) ---------- */
@font-face { font-family: 'DM Sans'; font-weight: 400; font-style: normal; font-display: swap; src: url('../fonts/dm-sans-latin-400-normal.woff2') format('woff2'); }
@font-face { font-family: 'DM Sans'; font-weight: 500; font-style: normal; font-display: swap; src: url('../fonts/dm-sans-latin-500-normal.woff2') format('woff2'); }
@font-face { font-family: 'DM Sans'; font-weight: 700; font-style: normal; font-display: swap; src: url('../fonts/dm-sans-latin-700-normal.woff2') format('woff2'); }
@font-face { font-family: 'Space Grotesk'; font-weight: 500; font-style: normal; font-display: swap; src: url('../fonts/space-grotesk-latin-500-normal.woff2') format('woff2'); }
@font-face { font-family: 'Space Grotesk'; font-weight: 700; font-style: normal; font-display: swap; src: url('../fonts/space-grotesk-latin-700-normal.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-weight: 500; font-style: normal; font-display: swap; src: url('../fonts/jetbrains-mono-latin-500-normal.woff2') format('woff2'); }

/* ---------- Tokens ---------- */
/* Shared (theme-independent) */
:root {
  --radius: 24px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --display: 'Space Grotesk', 'DM Sans', system-ui, sans-serif;
  --body: 'DM Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --nav-offset: 96px;
}

/* Light theme (default) */
:root, :root[data-theme="light"] {
  color-scheme: light;
  --ink: #f6f7fc;            /* page background */
  --text: #141a3a;
  --strong: #0b1030;         /* headings and emphasis */
  --muted: #4f587e;
  --wash: 20, 26, 58;        /* tint used for borders and subtle fills */
  --line: rgba(var(--wash), .11);
  --line-2: rgba(var(--wash), .20);
  --violet: #5b49f2;
  --violet-rgb: 91, 73, 242;
  --violet-soft: #5b49f2;
  --mint: #0a7a67;           /* accent for text, borders and icons */
  --mint-rgb: 10, 122, 103;
  --tag-text: #4636d6;
  --solid: #5b49f2;          /* primary button */
  --solid-hover: #4636d6;
  --on-solid: #fff;
  --stroke: rgba(20, 26, 58, .9);
  --placeholder: rgba(79, 88, 126, .65);
  --surface: #fff;
  --surface-2: #fff;
  --card-bg: #fff;
  --card-shadow: 0 1px 2px rgba(20, 26, 58, .05), 0 10px 30px rgba(20, 26, 58, .06);
  --nav-bg: rgba(255, 255, 255, .72);
  --nav-bg-solid: rgba(255, 255, 255, .92);
  --panel-rgb: 255, 255, 255;
  --field-bg: #f4f5fb;
  --field-bg-focus: #fff;
  --shade: 38, 46, 110;      /* shadow colour */
  --sk: .32;                 /* shadow strength */
  --glow-op: .6;             /* strength of the background glows */
  --hero-bg: url('../images/hero-bg-light.webp');
  --ring-fill: rgba(255, 255, 255, .55);
  --ring-edge: rgba(20, 26, 58, .08);
  --stage-bg:
    radial-gradient(60% 46% at 50% 42%, rgba(79, 227, 193, .45), transparent 72%),
    radial-gradient(70% 50% at 90% 0%, rgba(124, 108, 255, .34), transparent 70%),
    linear-gradient(165deg, #ffffff 0%, #eef0ff 55%, #e1e6fa 100%);
}

/* Dark theme: the original palette, unchanged */
:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #0a0e1c;
  --text: #eef0fa;
  --strong: #fff;
  --muted: #a4acc9;
  --wash: 255, 255, 255;
  --line: rgba(255, 255, 255, .10);
  --line-2: rgba(255, 255, 255, .16);
  --violet: #7c6cff;
  --violet-rgb: 124, 108, 255;
  --violet-soft: #b9b0ff;
  --mint: #4fe3c1;
  --mint-rgb: 79, 227, 193;
  --tag-text: #cfc9ff;
  --solid: #4fe3c1;
  --solid-hover: #fff;
  --on-solid: #0a0e1c;
  --stroke: rgba(238, 240, 250, .9);
  --placeholder: rgba(164, 172, 201, .6);
  --surface: rgba(255, 255, 255, .035);
  --surface-2: rgba(255, 255, 255, .06);
  --card-bg: linear-gradient(180deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .02));
  --card-shadow: none;
  --nav-bg: rgba(16, 22, 48, .72);
  --nav-bg-solid: rgba(10, 14, 28, .92);
  --panel-rgb: 10, 14, 28;
  --field-bg: rgba(10, 14, 28, .6);
  --field-bg-focus: rgba(10, 14, 28, .85);
  --shade: 4, 6, 18;
  --sk: 1;
  --glow-op: 1;
  --hero-bg: url('../images/hero-bg-dark.webp');
  --ring-fill: rgba(255, 255, 255, .025);
  --ring-edge: rgba(255, 255, 255, .08);
  --stage-bg:
    radial-gradient(60% 46% at 50% 42%, rgba(79, 227, 193, .42), transparent 72%),
    radial-gradient(70% 50% at 90% 0%, rgba(124, 108, 255, .55), transparent 70%),
    linear-gradient(165deg, #1b2358 0%, #121936 55%, #0c1126 100%);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { background: var(--ink); scroll-behavior: smooth; scroll-padding-top: var(--nav-offset); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--body);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 { margin: 0; color: var(--strong); font-family: var(--display); font-weight: 700; letter-spacing: -.02em; }
p { margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.7; }
ul { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: var(--text); text-decoration: none; transition: color .25s ease, background .25s ease, border-color .25s ease, transform .3s var(--ease); }
a:hover { color: var(--mint); }
button { font: inherit; }
strong, b { font-weight: 700; }
::selection { background: var(--solid); color: var(--on-solid); }

:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }
input:focus-visible, textarea:focus-visible { outline: 0; }

.container { width: min(1296px, 100% - 48px); margin-inline: auto; }

.skip-link {
  position: fixed; z-index: 1000; top: 12px; left: 12px;
  padding: 10px 18px; border-radius: 999px;
  background: var(--solid); color: var(--on-solid); font-weight: 700;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; color: var(--on-solid); }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Navigation ---------- */
.navbar { position: fixed; z-index: 100; inset: 0 0 auto 0; padding: 16px 0; transition: padding .3s ease; }
.navbar.is-scrolled { padding-top: 10px; }

.nav-inner {
  position: relative;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  width: min(1180px, 100% - 24px); margin-inline: auto;
  padding: 8px 8px 8px 16px;
  border: 1px solid var(--line); border-radius: 28px;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(16px) saturate(140%); backdrop-filter: blur(16px) saturate(140%);
  transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.navbar.is-scrolled .nav-inner { background: var(--nav-bg-solid); border-color: rgba(var(--wash), .14); box-shadow: 0 18px 48px rgba(var(--shade), calc(.38 * var(--sk))); }

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-family: var(--display); font-size: 1.12rem; font-weight: 700; letter-spacing: -.01em; }
.brand:hover { color: var(--strong); }
.brand-avatar { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; box-shadow: 0 0 0 2px var(--line-2); transition: box-shadow .3s ease, transform .3s var(--ease); }
.brand:hover .brand-avatar { box-shadow: 0 0 0 2px var(--mint); transform: scale(1.05); }
.brand-dot { color: var(--mint); }

.nav-menu { display: none; flex-basis: 100%; }
.nav-menu.is-open { display: block; }
.nav-links { display: flex; flex-direction: column; gap: 2px; margin-top: 8px; padding: 14px 0 10px; border-top: 1px solid var(--line); }

.nav-link { display: flex; align-items: center; min-height: 48px; padding: 10px 16px; border-radius: 14px; color: var(--muted); font-size: 1rem; font-weight: 500; }
.nav-link:hover { color: var(--strong); background: rgba(var(--wash), .07); }
.nav-link.active { color: var(--strong); background: rgba(var(--violet-rgb), .24); box-shadow: inset 0 0 0 1px rgba(var(--violet-rgb), .5); }

.nav-cta {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; min-height: 50px; margin: 4px 0 6px; padding: 11px 20px;
  border-radius: 999px; background: var(--solid); color: var(--on-solid);
  font-size: .94rem; font-weight: 700; white-space: nowrap;
}
.nav-cta:hover { background: var(--solid-hover); color: var(--on-solid); }
.nav-cta svg { transition: transform .25s ease; }
.nav-cta:hover svg { transform: translate(2px, -2px); }

.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-toggle, .theme-toggle { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: rgba(var(--wash), .05); cursor: pointer; }
.theme-toggle:hover { border-color: var(--mint); color: var(--mint); }
.theme-toggle { color: var(--text); transition: border-color .25s ease, color .25s ease, background .25s ease; }
.theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }
.nav-toggle-icon, .nav-toggle-icon::before, .nav-toggle-icon::after { display: block; width: 18px; height: 2px; border-radius: 2px; background: var(--text); }
.nav-toggle-icon { position: relative; transition: background 10ms 200ms ease; }
.nav-toggle-icon::before, .nav-toggle-icon::after { content: ''; position: absolute; left: 0; transition: top .2s .2s ease, transform .2s ease; }
.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before, .nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { top: 0; transition: top .2s ease, transform .2s .2s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { transform: rotate(-45deg); }

@media (min-width: 992px) {
  .nav-toggle { display: none; }
  .nav-actions { order: 2; margin-left: 12px; }
  .nav-menu { order: 1; display: flex; flex: 1; flex-basis: auto; align-items: center; }
  .nav-links { flex-direction: row; gap: 4px; margin: 0 auto; padding: 0; border: 0; }
  .nav-link { min-height: 0; padding: 10px 18px; border-radius: 999px; font-size: .94rem; }
  .nav-cta { width: auto; min-height: 0; margin: 0; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; isolation: isolate;
  display: flex; flex-direction: column; justify-content: center;
  min-height: 100vh; min-height: 100svh;
  padding: 128px 0 72px;
  overflow: hidden;
  background: var(--ink) var(--hero-bg) 70% 20% / cover no-repeat;
}
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 56px; align-items: center; }

.hero-eyebrow, .availability {
  display: inline-flex; align-items: center; gap: 10px;
  border-radius: 999px; font-family: var(--mono); font-weight: 500;
}
.hero-eyebrow { margin-bottom: 26px; padding: 8px 16px 8px 12px; border: 1px solid var(--line); background: rgba(var(--wash), .05); color: var(--muted); font-size: .76rem; letter-spacing: .02em; }

.pulse { position: relative; flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--mint); }
.pulse::after { content: ''; position: absolute; inset: -5px; border-radius: 50%; border: 1px solid var(--mint); animation: pulse 2s ease-out infinite; }

.hero-name { font-size: clamp(3.1rem, 8.4vw, 6.4rem); line-height: .96; letter-spacing: -.045em; }
.hero-name span { display: block; }
.outline { color: transparent; -webkit-text-stroke: 2px var(--stroke); paint-order: stroke fill; }

.hero-role { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; margin-top: 28px; color: var(--text); font-family: var(--display); font-size: clamp(1.15rem, 2.4vw, 1.6rem); font-weight: 500; letter-spacing: -.01em; }
.role-mark { width: 36px; height: 2px; background: var(--mint); }
.role-sub { color: var(--muted); font-family: var(--mono); font-size: .78rem; letter-spacing: .02em; }

.hero-lead { max-width: 560px; margin-top: 20px; font-size: clamp(1rem, 1.5vw, 1.12rem); }
.hero-lead strong { color: var(--text); font-weight: 500; }

.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 34px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 52px; padding: 0 26px; border: 1px solid transparent; border-radius: 999px; font-size: 1rem; font-weight: 700; white-space: nowrap; cursor: pointer; }
.btn svg { flex: none; transition: transform .25s ease; }
.btn-primary { background: var(--solid); color: var(--on-solid); }
.btn-primary:hover { background: var(--solid-hover); color: var(--on-solid); transform: translateY(-2px); }
.btn-ghost { border-color: rgba(var(--wash), .22); background: rgba(var(--wash), .04); color: var(--text); }
.btn-ghost:hover { border-color: var(--mint); background: rgba(var(--mint-rgb), .1); color: var(--strong); transform: translateY(-2px); }
.btn:hover svg { transform: translateY(2px); }

.icon-links { display: flex; gap: 10px; }
.icon-links a { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid var(--line); border-radius: 50%; color: var(--muted); }
.icon-links a:hover { border-color: var(--mint); background: rgba(var(--mint-rgb), .1); color: var(--mint); transform: translateY(-2px); }
.hero-actions .icon-links { margin-left: 6px; }

.hero-stage-wrap { position: relative; width: min(100%, 440px); margin-inline: auto; }
.hero-stage {
  position: relative; aspect-ratio: 5 / 6; overflow: hidden;
  border: 1px solid var(--line); border-radius: 32px;
  background: var(--stage-bg);
}
.hero-stage::before { content: ''; position: absolute; top: 6%; left: 50%; width: 82%; aspect-ratio: 1; transform: translateX(-50%); border: 1px dashed rgba(var(--wash), .22); border-radius: 50%; box-shadow: 0 0 0 38px var(--ring-fill), 0 0 0 39px var(--ring-edge); }
.hero-photo { position: absolute; bottom: 0; left: 50%; width: auto; max-width: none; height: 95%; transform: translateX(-50%); filter: drop-shadow(0 18px 28px rgba(var(--shade), calc(.5 * var(--sk)))); user-select: none; }

.hero-badge { position: absolute; z-index: 2; top: -22px; right: -8px; width: 104px; height: 104px; border: 1px solid var(--line); border-radius: 50%; background: var(--ink); box-shadow: 0 10px 28px rgba(var(--shade), calc(.4 * var(--sk))); }
.hero-badge svg { width: 100%; height: 100%; }
.hero-badge .ring-text { transform-origin: 50% 50%; animation: spin 22s linear infinite; }
.hero-badge text { fill: var(--text); font-family: var(--mono); font-size: 9.4px; font-weight: 500; }
.hero-badge .spark { fill: var(--mint); }

@keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0% { transform: scale(.6); opacity: .9; } 100% { transform: scale(1.7); opacity: 0; } }

.hero-copy > * { animation: rise .8s var(--ease) both; }
.hero-copy > :nth-child(2) { animation-delay: .08s; }
.hero-copy > :nth-child(3) { animation-delay: .16s; }
.hero-copy > :nth-child(4) { animation-delay: .24s; }
.hero-copy > :nth-child(5) { animation-delay: .32s; }
.hero-stage-wrap { animation: rise .9s .2s var(--ease) both; }

/* ---------- Shared section pieces ---------- */
.section { position: relative; isolation: isolate; padding: 84px 0; }
.section::before { content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: var(--glow-op); -webkit-mask-image: linear-gradient(transparent, #000 22%, #000 78%, transparent); mask-image: linear-gradient(transparent, #000 22%, #000 78%, transparent); }
.about::before { background: radial-gradient(42% 38% at 100% 8%, rgba(124, 108, 255, .16), transparent 70%); }
.skills::before { background: radial-gradient(40% 34% at 0% 18%, rgba(79, 227, 193, .10), transparent 70%), radial-gradient(36% 30% at 100% 82%, rgba(124, 108, 255, .12), transparent 70%); }
.projects::before { background: radial-gradient(44% 30% at 50% 0%, rgba(124, 108, 255, .14), transparent 70%), radial-gradient(34% 26% at 0% 100%, rgba(79, 227, 193, .08), transparent 70%); }
.contact::before { background: radial-gradient(46% 42% at 0% 100%, rgba(79, 227, 193, .12), transparent 70%), radial-gradient(40% 40% at 100% 0%, rgba(124, 108, 255, .16), transparent 70%); }

.sec-head { max-width: 920px; margin-bottom: 40px; }
.sec-kicker { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 18px; color: var(--mint); font-family: var(--mono); font-size: .78rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; }
.sec-kicker span { padding: 4px 9px; border: 1px solid rgba(var(--mint-rgb), .35); border-radius: 999px; background: rgba(var(--mint-rgb), .08); }
.sec-title { font-size: clamp(2.1rem, 4.8vw, 3.5rem); line-height: 1.04; letter-spacing: -.04em; }
.sec-title em { color: transparent; font-style: normal; -webkit-text-stroke: 1.5px var(--stroke); }
.sec-lead { max-width: 620px; margin-top: 18px; font-size: 1.05rem; }

.surface { position: relative; box-shadow: var(--card-shadow); padding: 24px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); transition: border-color .35s ease, background .35s ease, transform .35s var(--ease); }
.surface:hover { border-color: var(--line-2); background: var(--surface-2); }

.card-label { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; font-size: 1.15rem; letter-spacing: -.01em; }
.icon-tile { display: grid; place-items: center; flex: none; width: 42px; height: 42px; border-radius: 13px; background: rgba(var(--mint-rgb), .12); color: var(--mint); }
.icon-tile.violet { background: rgba(var(--violet-rgb), .16); color: var(--violet-soft); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(var(--wash), .04); color: var(--text); font-family: var(--mono); font-size: .76rem; font-weight: 500; line-height: 1.3; }

.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: var(--d, 0s); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- About ---------- */
.bento { display: grid; grid-template-columns: 1fr; gap: 16px; }
.b-bio { display: flex; flex-direction: column; }
.b-bio p { margin-bottom: 16px; font-size: 1.05rem; }
.b-bio strong { color: var(--text); font-weight: 500; }
.bio-focus { margin-top: auto; padding-top: 24px; border-top: 1px solid var(--line); }
.bio-focus small { display: block; margin-bottom: 12px; color: var(--muted); font-family: var(--mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }

.edu-degree { color: var(--strong); font-family: var(--display); font-size: 1.3rem; line-height: 1.25; font-weight: 700; letter-spacing: -.02em; }
.edu-school { margin: 6px 0 20px; font-size: .95rem; }
.edu-earlier { margin-top: 22px; padding-top: 14px; border-top: 1px solid var(--line); }
.edu-earlier li { display: flex; justify-content: space-between; gap: 16px; padding: 7px 0; color: var(--muted); font-size: .9rem; }
.edu-earlier li span:last-child { flex: none; color: var(--text); font-family: var(--mono); font-size: .78rem; }

.honor-list li { display: flex; align-items: center; gap: 16px; padding: 24px 0; border-top: 1px solid var(--line); }
.honor-list li:first-child { padding-top: 0; border-top: 0; }
.honor-list li:last-child { padding-bottom: 0; }
.honor-badge { display: grid; place-items: center; flex: none; width: 52px; height: 52px; border-radius: 16px; background: linear-gradient(135deg, rgba(var(--violet-rgb), .3), rgba(var(--mint-rgb), .18)); color: var(--strong); font-family: var(--display); font-size: 1.15rem; font-weight: 700; }
.honor-list b { display: block; color: var(--strong); font-weight: 500; line-height: 1.3; }
.honor-list small { color: var(--muted); font-size: .85rem; }

.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ''; position: absolute; top: 8px; bottom: 8px; left: 5px; width: 1px; background: var(--line-2); }
.timeline li { position: relative; padding-bottom: 20px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before { content: ''; position: absolute; top: 7px; left: -26px; width: 11px; height: 11px; border: 2px solid var(--mint); border-radius: 50%; background: var(--ink); }
.tl-role { display: block; color: var(--strong); font-weight: 500; line-height: 1.4; }
.tl-meta { display: block; margin-top: 3px; color: var(--muted); font-size: .88rem; line-height: 1.55; }

.facts { display: grid; grid-template-columns: 1fr; gap: 18px; }
.facts li { display: flex; align-items: center; gap: 14px; min-width: 0; }
.facts small { display: block; color: var(--muted); font-family: var(--mono); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; }
.facts b, .facts a { display: block; overflow-wrap: anywhere; color: var(--strong); font-size: .95rem; font-weight: 500; line-height: 1.35; }
.facts a:hover { color: var(--mint); }

/* ---------- Skills + learning ---------- */
.skill-groups { display: grid; grid-template-columns: 1fr; gap: 16px; margin-bottom: 72px; }
.skill-group h3 { margin-bottom: 16px; color: var(--muted); font-family: var(--mono); font-size: .76rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; }

.sub-head { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; margin-bottom: 32px; }
.sub-title { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -.03em; }
.sub-note { max-width: 440px; font-size: .92rem; }

.learn-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.learn-card:hover { transform: translateY(-4px); }
.learn-top { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.learn-top h3 { flex: 1; font-size: 1.2rem; letter-spacing: -.02em; }
.learn-no { color: rgba(var(--wash), .28); font-family: var(--mono); font-size: .8rem; font-weight: 500; }
.learn-list li { position: relative; padding-left: 20px; color: var(--muted); font-size: .95rem; line-height: 1.6; }
.learn-list li + li { margin-top: 8px; }
.learn-list li::before { content: ''; position: absolute; top: .62em; left: 0; width: 8px; height: 2px; border-radius: 2px; background: var(--mint); }

/* ---------- Projects ---------- */
.projects-grid { display: grid; grid-template-columns: 1fr; gap: 18px; }

.project-card {
  --mx: 50%; --my: 0%;
  position: relative; display: flex; flex-direction: column; overflow: hidden;
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--card-shadow);
  background: var(--card-bg);
  transition: transform .45s var(--ease), border-color .35s ease, box-shadow .45s ease;
}
.project-card::before { content: ''; position: absolute; inset: 0; z-index: 1; pointer-events: none; opacity: 0; background: radial-gradient(380px circle at var(--mx) var(--my), rgba(79, 227, 193, .16), rgba(124, 108, 255, .10) 45%, transparent 70%); transition: opacity .4s ease; }

.project-visual { position: relative; display: block; width: 100%; aspect-ratio: 16 / 10; padding: 0; overflow: hidden; border: 0; cursor: zoom-in; background: radial-gradient(70% 90% at 80% 0%, rgba(var(--tint, 124, 108, 255), .42), transparent 70%), linear-gradient(160deg, #1a2150, #101631); }
.project-visual img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: top center; transition: transform .8s var(--ease); }
:root[data-theme="light"] .project-card--feature .project-visual { background: #0d1230; }
.project-card--feature .project-visual img { object-fit: contain; object-position: center; }

.project-no { position: absolute; z-index: 2; top: 14px; right: 16px; color: rgba(255, 255, 255, .85); font-family: var(--mono); font-size: .78rem; font-weight: 500; text-shadow: 0 1px 8px rgba(4, 6, 18, .6); }
.project-zoom { position: absolute; z-index: 2; right: 14px; bottom: 14px; display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--solid); color: var(--on-solid); opacity: 0; transform: scale(.6); transition: opacity .3s ease, transform .4s var(--ease); }

.project-body { position: relative; z-index: 2; display: flex; flex: 1; flex-direction: column; padding: 22px 20px 24px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.project-tags li { padding: 4px 10px; border-radius: 999px; background: rgba(var(--violet-rgb), .18); color: var(--tag-text); font-family: var(--mono); font-size: .7rem; font-weight: 500; }
.project-tags li:first-child { background: rgba(var(--mint-rgb), .14); color: var(--mint); }
.project-title { margin-bottom: 10px; font-size: 1.3rem; line-height: 1.2; letter-spacing: -.025em; }
.project-title span { background: linear-gradient(var(--mint), var(--mint)) left 100% / 0 2px no-repeat; transition: background-size .5s var(--ease); }
.project-desc { flex: 1; margin-bottom: 20px; font-size: .94rem; line-height: 1.65; }
.project-link { display: inline-flex; align-items: center; gap: 8px; align-self: flex-start; color: var(--text); font-size: .92rem; font-weight: 700; }
.project-link svg { transition: transform .35s var(--ease); }
.project-link:hover { color: var(--mint); }

@media (hover: hover) {
  .project-card:hover, .project-card:focus-within { transform: translateY(-8px); border-color: rgba(var(--mint-rgb), .5); box-shadow: 0 26px 60px rgba(var(--shade), calc(.55 * var(--sk))), 0 0 0 1px rgba(var(--mint-rgb), .12); }
  .project-card:hover::before, .project-card:focus-within::before { opacity: 1; }
  .project-card:hover .project-visual img { transform: scale(1.07); }
  .project-card:hover .project-zoom, .project-visual:focus-visible .project-zoom { opacity: 1; transform: none; }
  .project-card:hover .project-title span { background-size: 100% 2px; }
  .project-card:hover .project-link svg, .project-link:hover svg { transform: translate(3px, -3px); }
}
@media (hover: none) { .project-zoom { opacity: 1; transform: none; } }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.contact-card { display: flex; flex-direction: column; }
.availability { align-self: flex-start; margin-bottom: 24px; padding: 8px 14px 8px 12px; border: 1px solid rgba(var(--mint-rgb), .3); background: rgba(var(--mint-rgb), .08); color: var(--mint); font-size: .74rem; line-height: 1.3; }
.contact-card h3 { margin-bottom: 12px; font-size: clamp(1.6rem, 2.6vw, 2.1rem); line-height: 1.12; letter-spacing: -.035em; }
.contact-card > p { margin-bottom: 28px; font-size: .98rem; }

.contact-links { display: grid; gap: 12px; margin-bottom: 28px; }
.contact-link { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 18px; background: rgba(var(--wash), .03); color: var(--strong); }
.contact-link:hover { border-color: rgba(var(--mint-rgb), .5); background: rgba(var(--mint-rgb), .06); color: var(--strong); transform: translateX(4px); }
.contact-link .icon-tile { background: rgba(var(--violet-rgb), .16); color: var(--violet-soft); }
.contact-link:hover .icon-tile { background: var(--solid); color: var(--on-solid); }
.contact-link small { display: block; color: var(--muted); font-family: var(--mono); font-size: .66rem; letter-spacing: .06em; text-transform: uppercase; }
.contact-link b { display: block; overflow-wrap: anywhere; font-size: .96rem; font-weight: 500; line-height: 1.3; }

.contact-card .icon-links { margin-top: auto; }
.contact-card .icon-links a { width: 46px; height: 46px; }

.contact-form { display: grid; grid-template-columns: 1fr; gap: 16px; }
.contact-form h3 { margin-bottom: 4px; font-size: 1.5rem; letter-spacing: -.03em; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { color: var(--muted); font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; }
.field input, .field textarea { width: 100%; padding: 15px 18px; border: 1px solid var(--line); border-radius: 16px; background: var(--field-bg); color: var(--strong); font-family: var(--body); font-size: 1rem; transition: border-color .25s ease, box-shadow .25s ease, background .25s ease; }
.field textarea { flex: 1; min-height: 150px; resize: vertical; }
.field input::placeholder, .field textarea::placeholder { color: var(--placeholder); }
.field input:hover, .field textarea:hover { border-color: var(--line-2); }
.field input:focus, .field textarea:focus { outline: 0; border-color: var(--mint); background: var(--field-bg-focus); box-shadow: 0 0 0 4px rgba(var(--mint-rgb), .14); }

.form-foot { display: flex; flex-direction: column-reverse; align-items: stretch; gap: 16px; margin-top: 4px; }
.form-note { min-height: 1.4em; font-size: .85rem; }
.form-note.is-ok { color: var(--mint); }
.contact-form .btn { width: 100%; min-height: 54px; padding: 0 30px; }
.contact-form .btn:hover svg { transform: translate(3px, -3px); }

/* ---------- Footer ---------- */
.site-footer { position: relative; padding: 56px 0 30px; border-top: 1px solid var(--line); }
.site-footer::before { content: ''; position: absolute; top: -1px; left: 50%; width: min(420px, 70%); height: 1px; transform: translateX(-50%); background: linear-gradient(90deg, transparent, var(--mint), var(--violet), transparent); }
.footer-top { display: grid; grid-template-columns: 1fr 1fr; gap: 30px 20px; }
.footer-brand { grid-column: 1 / -1; }
.footer-logo { font-family: var(--display); font-size: 1.6rem; font-weight: 700; letter-spacing: -.02em; }
.footer-logo span { color: var(--mint); }
.footer-brand p { max-width: 360px; margin-top: 12px; font-size: .95rem; }
.footer-col { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.footer-col h4 { margin-bottom: 6px; color: var(--muted); font-family: var(--mono); font-size: .74rem; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; }
.footer-col a { font-size: .95rem; }
.footer-col a:hover { transform: translateX(4px); }
.footer-col .to-top { display: inline-flex; align-items: center; gap: 8px; }
.footer-bottom { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--line); }
.footer-bottom p { font-size: .85rem; }

/* ---------- Lightbox ---------- */
.lightbox { --text: #eef0fa; --muted: #a4acc9; --line-2: rgba(255, 255, 255, .16); --solid: #4fe3c1; --on-solid: #0a0e1c; width: 100%; max-width: none; height: 100%; max-height: none; margin: 0; padding: 0; border: 0; background: transparent; color: var(--text); }
.lightbox::backdrop { background: rgba(4, 6, 18, .92); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.lightbox[open] { display: grid; grid-template-rows: 1fr auto; animation: fade .25s ease; }
.lb-stage { display: grid; place-items: center; min-height: 0; padding: 64px 72px 12px; }
.lb-stage img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; border-radius: 12px; box-shadow: 0 30px 80px rgba(0, 0, 0, .6); }
.lb-caption { padding: 8px 24px 28px; text-align: center; color: var(--muted); font-size: .92rem; }
.lb-btn { position: absolute; z-index: 2; display: grid; place-items: center; width: 48px; height: 48px; padding: 0; border: 1px solid var(--line-2); border-radius: 50%; background: rgba(255, 255, 255, .08); color: var(--strong); cursor: pointer; transition: background .2s ease, color .2s ease; }
.lb-btn:hover { background: var(--solid); color: var(--on-solid); }
.lb-close { top: 16px; right: 16px; }
.lb-prev, .lb-next { top: 50%; margin-top: -24px; }
.lb-prev { left: 16px; }
.lb-next { right: 16px; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* ---------- Breakpoints (mobile first) ---------- */
@media (min-width: 576px) {
  .section { padding: 96px 0; }
  .surface { padding: 32px; }
  .project-body { padding: 24px 26px 26px; }
  .contact-card { padding: 36px; }
  .form-foot { flex-direction: row; align-items: center; justify-content: space-between; }
  .form-note { flex: 1; }
  .contact-form .btn { width: auto; }
  .contact-form { grid-template-columns: 1fr 1fr; }
  .contact-form h3, .field--full, .form-foot { grid-column: 1 / -1; }
}

@media (min-width: 768px) {
  .skill-groups, .learn-grid { grid-template-columns: 1fr 1fr; }
  .facts { grid-template-columns: 1fr 1fr; gap: 24px; }
  .projects-grid { grid-template-columns: 1fr 1fr; gap: 22px; }
  .project-card--feature { grid-column: 1 / -1; }
  .footer-top { grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; }
  .footer-brand { grid-column: auto; }
}

@media (min-width: 992px) {
  .section { padding: 112px 0; }
  .sec-head { margin-bottom: 56px; }
  .hero-grid { grid-template-columns: 7fr 5fr; gap: 24px; }
  .hero-stage-wrap { width: min(100%, 460px); }

  .bento { grid-template-columns: repeat(12, 1fr); gap: 22px; }
  .b-bio, .b-lead { grid-column: span 7; }
  .b-edu, .b-honors { grid-column: span 5; }
  .b-bio { grid-column: span 7; }
  .b-lead { grid-column: span 7; }
  .b-facts { grid-column: span 12; }

  .skill-groups { margin-bottom: 96px; }
  .sub-head { flex-direction: row; align-items: flex-end; justify-content: space-between; gap: 24px; }
  .projects-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .project-card--feature { grid-column: span 2; flex-direction: row; }
  .project-card--feature .project-visual { flex: 1.2; width: auto; aspect-ratio: auto; min-height: 100%; }
  .project-card--feature .project-body { flex: 1; justify-content: center; padding: 34px; }
  .project-card--feature .project-title { font-size: 1.75rem; }
  .project-card--feature .project-desc { flex: 0 1 auto; font-size: 1rem; }
  .contact-grid { grid-template-columns: 5fr 7fr; gap: 24px; }
}

@media (min-width: 1200px) {
  .facts { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 575.98px) {
  .hero { padding-top: 100px; }
  .hero-eyebrow { margin-bottom: 20px; font-size: .7rem; }
  .hero-role { margin-top: 22px; }
  .hero-actions { gap: 12px; margin-top: 28px; }
  .hero-actions .btn { flex: 1 1 100%; }
  .hero-actions .icon-links { margin: 4px 0 0; }
  .hero-stage { border-radius: 26px; }
  .hero-badge { top: -26px; right: 6px; width: 86px; height: 86px; }
  .lb-stage { padding: 72px 12px 8px; }
  .lb-prev { left: 8px; top: auto; bottom: 20px; margin: 0; }
  .lb-next { right: 8px; top: auto; bottom: 20px; margin: 0; }
}

html.theme-anim *, html.theme-anim *::before, html.theme-anim *::after { transition: background-color .35s ease, border-color .35s ease, color .35s ease, fill .35s ease, box-shadow .35s ease !important; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* ---------- Icons (SVG sprite in index.html) ---------- */
.i { flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }