/* Portfolio - M. Ikram Ullah. Mobile-first; light and dark themes; respects prefers-reduced-motion. */
:root {
  --bg: #f7f8fc; --bg-2: #ffffff; --surface: #ffffff; --surface-2: #f0f2f9;
  --text: #0f172a; --muted: #5b6478; --line: #e2e6f0;
  --accent: #4f46e5; --accent-2: #0ea5e9; --accent-3: #ec4899; --good: #059669; --warn: #d97706;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
  --shadow-lg: 0 12px 40px rgba(79, 70, 229, .18);
  --radius: 16px; --max: 1120px; --gutter: 16px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1020; --bg-2: #0f1528; --surface: #131a31; --surface-2: #1a2240;
    --text: #e8ecf8; --muted: #9aa4bf; --line: #252e4d;
    --accent: #818cf8; --accent-2: #38bdf8; --accent-3: #f472b6; --good: #34d399; --warn: #fbbf24;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25); --shadow-lg: 0 12px 40px rgba(129, 140, 248, .22);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b1020; --bg-2: #0f1528; --surface: #131a31; --surface-2: #1a2240;
  --text: #e8ecf8; --muted: #9aa4bf; --line: #252e4d;
  --accent: #818cf8; --accent-2: #38bdf8; --accent-3: #f472b6; --good: #34d399; --warn: #fbbf24;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25); --shadow-lg: 0 12px 40px rgba(129, 140, 248, .22);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img, svg { max-width: 100%; }
svg { width: 1.1em; height: 1.1em; flex: none; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.02em; }
h2 { font-size: clamp(1.7rem, 4vw, 2.4rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.mono { font-family: "JetBrains Mono", ui-monospace, monospace; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: .75rem; font-weight: 700; color: var(--accent); margin-bottom: .6em; }
.lead { font-size: 1.12rem; color: var(--muted); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 8px; }

/* progress + nav ---------------------------------------------------------------------------------- */
.progress { position: fixed; inset: 0 auto auto 0; height: 3px; width: 0; z-index: 60;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3)); }
.nav {
  position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 12px;
  padding: 12px var(--gutter); background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid transparent; transition: border-color .3s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.brand { font-weight: 800; font-size: 1.2rem; color: var(--text); letter-spacing: -.03em; margin-right: auto; }
.brand span { color: var(--accent); }
.brand:hover { text-decoration: none; }
.nav nav { order: 2; }
.nav ul { list-style: none; margin: 0; padding: 0; }
.nav ul a { color: var(--muted); font-weight: 600; font-size: .95rem; padding: 6px 2px; position: relative; }
.nav ul a:hover, .nav ul a.active { color: var(--text); text-decoration: none; }
.nav ul a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--accent);
  transform: scaleX(0); transition: transform .25s; transform-origin: left; }
.nav ul a.active::after, .nav ul a:hover::after { transform: scaleX(1); }
.menu-btn { display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; width: 40px; height: 40px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--surface); cursor: pointer; padding: 0 10px; }
.menu-btn span { display: block; height: 2px; background: var(--text); border-radius: 2px; transition: transform .25s; }
.menu-btn[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
#menu { position: absolute; left: var(--gutter); right: var(--gutter); top: 64px; display: none; flex-direction: column; gap: 4px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; box-shadow: var(--shadow); }
#menu.open { display: flex; }
#menu a { display: block; padding: 10px 12px; }
.theme-btn { order: 1; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface);
  color: var(--text); cursor: pointer; display: grid; place-items: center; }
.theme-btn .i-moon { display: none; }
:root[data-theme="dark"] .theme-btn .i-sun { display: none; }
:root[data-theme="dark"] .theme-btn .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme-btn .i-moon { display: block; }
}
@media (min-width: 820px) {
  .menu-btn { display: none; }
  #menu { position: static; display: flex; flex-direction: row; gap: 26px; background: none; border: 0; padding: 0; box-shadow: none; }
  #menu a { padding: 6px 2px; }
  .nav nav { order: 0; margin-right: 18px; }
  .nav { padding: 14px max(var(--gutter), calc((100vw - var(--max)) / 2)); }
}

/* buttons ------------------------------------------------------------------------------------------ */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 12px; font: inherit; font-weight: 600;
  font-size: .95rem; cursor: pointer; border: 1px solid transparent; transition: transform .15s, box-shadow .2s, background .2s; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, var(--accent-2))); color: #fff; box-shadow: var(--shadow-lg); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); }

/* hero --------------------------------------------------------------------------------------------- */
.hero { position: relative; min-height: min(92vh, 820px); display: grid; place-items: center; padding: 64px var(--gutter) 48px; overflow: hidden; isolation: isolate; }
.hero-inner { max-width: 860px; text-align: center; }
.hero h1 { font-size: clamp(2.6rem, 9vw, 5.4rem); font-weight: 800; letter-spacing: -.045em; margin-bottom: .1em;
  background: linear-gradient(120deg, var(--text) 30%, var(--accent) 60%, var(--accent-3)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.role { font-size: clamp(1.25rem, 3.6vw, 1.9rem); font-weight: 700; color: var(--accent); min-height: 1.4em; margin-bottom: .6em; }
.caret { display: inline-block; width: 3px; height: 1.05em; background: var(--accent); margin-left: 4px; vertical-align: -.15em; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.tagline { font-size: clamp(1.02rem, 2.4vw, 1.25rem); color: var(--muted); max-width: 640px; margin: 0 auto 1.8em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.socials { display: flex; justify-content: center; gap: 14px; margin-top: 28px; }
.socials a { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; border: 1px solid var(--line);
  color: var(--text); background: var(--surface); transition: transform .2s, color .2s, border-color .2s; }
.socials a:hover { transform: translateY(-3px); color: var(--accent); border-color: var(--accent); }
.socials svg { width: 20px; height: 20px; }
.blob { position: absolute; border-radius: 50%; filter: blur(70px); opacity: .5; z-index: -1; animation: float 18s ease-in-out infinite; }
.b1 { width: 420px; height: 420px; background: var(--accent); top: -120px; left: -80px; }
.b2 { width: 360px; height: 360px; background: var(--accent-2); bottom: -120px; right: -60px; animation-delay: -6s; }
.b3 { width: 260px; height: 260px; background: var(--accent-3); top: 40%; left: 55%; opacity: .32; animation-delay: -12s; }
@keyframes float { 0%, 100% { transform: translate(0, 0) scale(1); } 33% { transform: translate(40px, -30px) scale(1.08); } 66% { transform: translate(-30px, 25px) scale(.95); } }
.grid-bg { position: absolute; inset: 0; z-index: -1; opacity: .5;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px; mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%); -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%); }

.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: calc(100% + 8px); left: 50%; transform: translate(-50%, -6px); min-width: 250px; z-index: 10;
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 8px; box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transition: opacity .2s, transform .2s, visibility .2s; }
.dropdown.open .dropdown-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.dropdown-menu a { display: flex; gap: 10px; align-items: center; padding: 10px 12px; border-radius: 10px; color: var(--text); font-weight: 500; text-align: left; }
.dropdown-menu a:hover { background: var(--surface-2); text-decoration: none; }

/* stats -------------------------------------------------------------------------------------------- */
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; max-width: var(--max); margin: -12px auto 0; padding: 0 var(--gutter); }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.stat-num, .stat-suffix { font-size: clamp(1.6rem, 5vw, 2.3rem); font-weight: 800; letter-spacing: -.03em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat p { margin: 4px 0 0; color: var(--muted); font-size: .88rem; line-height: 1.4; }
@media (min-width: 820px) { .stats { grid-template-columns: repeat(4, 1fr); gap: 16px; } }

/* sections ----------------------------------------------------------------------------------------- */
.section { max-width: var(--max); margin: 0 auto; padding: 72px var(--gutter) 24px; }
.section.narrow { max-width: 820px; }
.section-head { max-width: 680px; margin-bottom: 28px; }

/* filters + cards ---------------------------------------------------------------------------------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.chip { font: inherit; font-size: .88rem; font-weight: 600; padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--surface); color: var(--muted); cursor: pointer; transition: all .2s; }
.chip:hover { color: var(--text); border-color: var(--accent); }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.cards { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 680px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1040px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { position: relative; display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s, border-color .25s, opacity .3s;
  transform-style: preserve-3d; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: 0 0 auto; height: 3px; background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  opacity: 0; transition: opacity .25s; }
.card:hover { box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.card:hover::before { opacity: 1; }
.card.hidden { display: none; }
.card h3 { margin-top: 10px; }
.card-top { display: flex; gap: 6px; flex-wrap: wrap; }
.card-blurb { color: var(--muted); font-size: .95rem; }
.badge { font-size: .72rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; letter-spacing: .02em; }
.badge-done { background: color-mix(in srgb, var(--good) 15%, transparent); color: var(--good); }
.badge-live { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); }
.badge-live::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: currentColor; margin-right: 6px;
  vertical-align: 1px; animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.badge-private { background: var(--surface-2); color: var(--muted); }
.highlights { list-style: none; padding: 0; margin: 4px 0 14px; display: grid; gap: 6px; }
.highlights li { font-size: .88rem; padding-left: 22px; position: relative; line-height: 1.45; }
.highlights li::before { content: "▸"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: auto 0 14px; }
.tag { font-size: .74rem; font-family: "JetBrains Mono", ui-monospace, monospace; padding: 3px 8px; border-radius: 6px;
  background: var(--surface-2); color: var(--muted); }
.card-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.card-actions .btn { padding: 8px 12px; font-size: .88rem; }

/* dialogs ------------------------------------------------------------------------------------------ */
.dialog { width: min(720px, calc(100vw - 2 * var(--gutter))); max-height: 86vh; border: 1px solid var(--line); border-radius: 20px;
  background: var(--surface); color: var(--text); padding: 28px 24px 24px; box-shadow: 0 30px 80px rgba(0, 0, 0, .35); }
.dialog::backdrop { background: rgba(8, 12, 28, .55); backdrop-filter: blur(4px); }
.dialog[open] { animation: pop .25s ease-out; }
@keyframes pop { from { opacity: 0; transform: translateY(12px) scale(.98); } }
.dialog-close { position: absolute; top: 12px; right: 14px; width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--line);
  background: var(--surface-2); color: var(--text); font-size: 1.3rem; cursor: pointer; line-height: 1; }
.dialog h3 { font-size: 1.45rem; padding-right: 40px; }
.dialog h4 { margin-top: 1.2em; font-size: .9rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.detail-list { padding-left: 1.1em; margin: 0 0 1em; }
.detail-list li { margin: .45em 0; }

/* research ----------------------------------------------------------------------------------------- */
.research-grid { display: grid; gap: 16px; }
@media (min-width: 900px) { .research-grid { grid-template-columns: 1.25fr 1fr; } }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.bars { margin: 18px 0 10px; display: grid; gap: 12px; }
.legend { display: flex; gap: 8px; align-items: center; font-size: .82rem; color: var(--muted); flex-wrap: wrap; }
.key { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.key-after { margin-left: 10px; }
.key-before, .bar-before { background: color-mix(in srgb, var(--muted) 45%, transparent); }
.key-after, .bar-after { background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.bar-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; }
.bar-label { font-size: .88rem; font-weight: 600; }
.bar-val { font-size: .85rem; font-family: "JetBrains Mono", ui-monospace, monospace; text-align: right; }
.bar-track { grid-column: 1 / -1; position: relative; height: 18px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.bar { position: absolute; left: 0; height: 50%; width: 0; border-radius: 999px; transition: width 1.2s cubic-bezier(.2, .8, .2, 1); }
.bar-before { top: 0; }
.bar-after { bottom: 0; transition-delay: .25s; }
.bars.in .bar { width: var(--w); }
.duel { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.duel > div { background: var(--surface-2); border-radius: 14px; padding: 16px; text-align: center; }
.duel-num { font-size: 2.2rem; font-weight: 800; color: var(--accent); }
.duel-unit { font-size: 1.2rem; font-weight: 700; color: var(--accent); }
.duel p { margin: 4px 0 0; font-size: .82rem; color: var(--muted); }

/* timeline ----------------------------------------------------------------------------------------- */
.timeline { list-style: none; padding: 0 0 0 26px; margin: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(var(--accent), var(--accent-2), var(--accent-3)); border-radius: 2px; }
.tl-item { position: relative; margin-bottom: 18px; }
.tl-dot { position: absolute; left: -24px; top: 22px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg);
  border: 3px solid var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); }
.tl-dot-edu { border-color: var(--accent-3); }
.tl-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.tl-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 16px; align-items: baseline; }
.tl-head h3 { margin: 0; }
.tl-date { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .82rem; color: var(--accent); white-space: nowrap; }
@media (min-width: 820px) { .timeline { padding-left: 40px; } .timeline::before { left: 14px; } .tl-dot { left: -33px; } }

/* skills ------------------------------------------------------------------------------------------- */
.tabs { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 16px; scrollbar-width: thin; }
.tab { flex: none; font: inherit; font-size: .88rem; font-weight: 600; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface); color: var(--muted); cursor: pointer; white-space: nowrap; }
.tab[aria-selected="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }
.tab-panel { display: flex; flex-wrap: wrap; gap: 8px; }
.tab-panel[hidden] { display: none; }
.skill { padding: 8px 13px; border-radius: 10px; background: var(--surface); border: 1px solid var(--line); font-size: .9rem;
  animation: rise .4s both; animation-delay: calc(var(--i) * 25ms); }
.skill:hover { border-color: var(--accent); color: var(--accent); }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }

/* contact + footer --------------------------------------------------------------------------------- */
.contact { text-align: center; max-width: 820px; padding-bottom: 72px; }
.contact-row, .cv-row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 18px; }
.cv-row a { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: .9rem; padding: 8px 12px; border-radius: 10px; background: var(--surface-2); color: var(--text); }
.cv-row a:hover { text-decoration: none; color: var(--accent); }
.copy span { overflow: hidden; text-overflow: ellipsis; max-width: 62vw; }
.footer { border-top: 1px solid var(--line); padding: 24px var(--gutter); text-align: center; color: var(--muted); font-size: .88rem; }
.footer p { margin: 0; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); background: var(--text); color: var(--bg);
  padding: 10px 16px; border-radius: 10px; font-weight: 600; font-size: .9rem; opacity: 0; transition: opacity .25s, transform .25s; pointer-events: none; z-index: 70; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* scroll reveal ------------------------------------------------------------------------------------ */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; transition-delay: calc(var(--i, 0) * 60ms); }
.js .reveal.in { opacity: 1; transform: none; }

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

/* soft fade from the hero background into the page */
.hero::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 160px; z-index: -1;
  background: linear-gradient(transparent, var(--bg)); pointer-events: none; }