/* ============================================================================
   styles.css — portfolio
   Dark by default, light on toggle. Colours live as custom properties at the
   top; change --accent and the whole site follows.
   ========================================================================== */

/* ── Tokens ─────────────────────────────────────────────────────────────── */
:root {
  --bg:          #0b0f14;
  --bg-elev:     #10161d;
  --surface:     #131b24;
  --surface-2:   #182231;
  --border:      #23303e;
  --border-soft: #1a242f;

  --text:        #e8eef5;
  --text-dim:    #a7b6c5;
  --text-mute:   #718596;

  --accent:      #2dd4bf;
  --accent-dim:  #14b8a6;
  --accent-ink:  #04211d;
  --accent-wash: rgba(45, 212, 191, 0.10);
  --accent-line: rgba(45, 212, 191, 0.30);

  --warn-wash:   rgba(250, 204, 21, 0.13);
  --warn-line:   rgba(250, 204, 21, 0.45);
  --warn-text:   #fde68a;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.30);
  --shadow-md: 0 10px 30px -12px rgba(0,0,0,.65);
  --shadow-lg: 0 24px 60px -20px rgba(0,0,0,.75);

  --radius:    14px;
  --radius-sm: 9px;
  --radius-lg: 22px;

  --wrap: 1120px;
  --header-h: 62px;

  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

:root[data-theme="light"] {
  --bg:          #fbfcfd;
  --bg-elev:     #ffffff;
  --surface:     #ffffff;
  --surface-2:   #f3f6f9;
  --border:      #dde5ec;
  --border-soft: #e9eef3;

  --text:        #0d1720;
  --text-dim:    #40525f;
  --text-mute:   #59697a;   /* darkened to clear AA on tags and meta text */

  --accent:      #0d9488;
  --accent-dim:  #0f766e;
  --accent-ink:  #ffffff;
  --accent-wash: rgba(13, 148, 136, 0.09);
  --accent-line: rgba(13, 148, 136, 0.28);

  --warn-wash:   rgba(202, 138, 4, 0.12);
  --warn-line:   rgba(202, 138, 4, 0.40);
  --warn-text:   #854d0e;

  --shadow-sm: 0 1px 2px rgba(15,32,48,.06);
  --shadow-md: 0 10px 28px -14px rgba(15,32,48,.22);
  --shadow-lg: 0 24px 56px -24px rgba(15,32,48,.28);
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

svg { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

/* Brand marks are solid single paths, not stroked outlines. */
svg.icon-brand { fill: currentColor; stroke: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 22px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.skip-link:focus { left: 12px; }

/* ── Header ─────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}
.site-header.is-stuck { border-bottom-color: var(--border-soft); }

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: -.01em;
  margin-right: auto;
  white-space: nowrap;
}
/* The mark is a transparent PNG, so no radius or plate — a rounded corner on
   a transparent image just clips empty pixels, and a glow would draw a square
   halo around nothing. */
.brand-mark {
  width: 30px; height: 30px;
  flex: none;
  object-fit: contain;
}

.nav { display: flex; gap: 4px; }
.nav a {
  position: relative;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: .9rem;
  color: var(--text-dim);
  transition: color .18s var(--ease), background .18s var(--ease);
}
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a.is-active { color: var(--accent); }
.nav a.is-active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.header-actions { display: flex; gap: 6px; align-items: center; }

.icon-btn {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 9px;
  border: 1px solid var(--border-soft);
  color: var(--text-dim);
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.icon-btn:hover { color: var(--text); border-color: var(--border); background: var(--surface-2); }
.icon-btn svg { width: 18px; height: 18px; }

#themeToggle .i-moon { display: none; }
:root[data-theme="light"] #themeToggle .i-sun  { display: none; }
:root[data-theme="light"] #themeToggle .i-moon { display: block; }

.nav-toggle { display: none; }

.scroll-progress {
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  transition: width .08s linear;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: clamp(64px, 12vw, 132px) 0 clamp(56px, 9vw, 104px);
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: -40% -10% auto -10%;
  height: 150%;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: radial-gradient(ellipse 70% 55% at 28% 22%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 70% 55% at 28% 22%, #000 0%, transparent 72%);
  opacity: .75;
  pointer-events: none;
}
.hero-inner { position: relative; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 13px 6px 10px;
  border: 1px solid var(--accent-line);
  background: var(--accent-wash);
  color: var(--accent);
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 550;
  letter-spacing: .01em;
}
.pulse {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-line);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 var(--accent-line); }
  70%  { box-shadow: 0 0 0 9px rgba(0,0,0,0); }
  100% { box-shadow: 0 0 0 0 rgba(0,0,0,0); }
}

.hero-title {
  margin-top: 22px;
  font-size: clamp(2.5rem, 7.5vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -.035em;
  font-weight: 700;
}

.hero-role {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: clamp(.95rem, 2vw, 1.1rem);
  color: var(--accent);
  letter-spacing: -.01em;
}

.hero-blurb {
  margin-top: 22px;
  max-width: 60ch;
  font-size: clamp(1rem, 1.6vw, 1.11rem);
  color: var(--text-dim);
}

.hero-cta {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 19px;
  border-radius: 11px;
  font-size: .94rem;
  font-weight: 580;
  border: 1px solid transparent;
  transition: transform .16s var(--ease), background .18s var(--ease),
              border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.btn svg { width: 17px; height: 17px; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 6px 20px -8px var(--accent);
}
.btn-primary:hover { background: var(--accent-dim); }

.btn-ghost {
  border-color: var(--border);
  color: var(--text-dim);
  background: var(--surface);
}
.btn-ghost:hover { color: var(--text); border-color: var(--accent-line); background: var(--surface-2); }

.hero-links {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  font-size: .86rem;
  color: var(--text-dim);
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.hero-links a:hover { color: var(--text); border-color: var(--accent-line); background: var(--surface); }
.hero-links svg { width: 15px; height: 15px; }

.hero-stats {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 44px;
  padding-top: 26px;
  border-top: 1px solid var(--border-soft);
}
.hero-stats > div { min-width: 96px; }
.hero-stats dt {
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 680;
  letter-spacing: -.03em;
  line-height: 1.1;
}
.hero-stats dd {
  margin: 3px 0 0;
  font-size: .82rem;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: .07em;
}

/* ── Section scaffolding ────────────────────────────────────────────────── */
.section { padding: clamp(56px, 9vw, 100px) 0; }
.section + .section { border-top: 1px solid var(--border-soft); }

.section-title {
  font-size: clamp(1.85rem, 4.2vw, 2.65rem);
  line-height: 1.14;
  letter-spacing: -.032em;
  font-weight: 680;
}

.section-lede {
  margin-top: 12px;
  max-width: 62ch;
  color: var(--text-dim);
}

/* ── About ──────────────────────────────────────────────────────────────── */
.about-grid {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 40px;
}
.about-copy p + p { margin-top: 16px; }
.about-copy p { color: var(--text-dim); font-size: 1.03rem; max-width: 62ch; }

.about-side {
  align-self: start;
  display: grid;
  gap: 14px;
}
.side-card {
  padding: 22px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--surface);
}
.side-title {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: var(--text-mute);
  font-weight: 600;
}
.focus-list { margin-top: 15px; display: grid; gap: 11px; }
.focus-list li {
  position: relative;
  padding-left: 22px;
  font-size: .93rem;
  color: var(--text-dim);
}
.focus-list li::before {
  content: "";
  position: absolute;
  left: 2px; top: .62em;
  width: 7px; height: 7px;
  border-radius: 2px;
  background: var(--accent);
  opacity: .85;
}

/* ── Filters ────────────────────────────────────────────────────────────── */
.filters {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.filter-btn {
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  font-size: .87rem;
  font-weight: 520;
  color: var(--text-dim);
  transition: all .18s var(--ease);
}
.filter-btn:hover { color: var(--text); border-color: var(--border); }
.filter-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.filter-btn .count {
  font-family: var(--mono);
  font-size: .74rem;
  opacity: .65;
  margin-left: 5px;
}

/* ── Projects ───────────────────────────────────────────────────────────── */
.project-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(315px, 1fr));
  gap: 18px;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform .22s var(--ease), border-color .22s var(--ease),
              box-shadow .22s var(--ease);
  animation: rise .34s var(--ease) both;
}
.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-md);
}
.project-card.is-featured {
  grid-column: span 2;
  background:
    radial-gradient(120% 140% at 100% 0%, var(--accent-wash) 0%, transparent 58%),
    var(--surface);
}
@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}

.pc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.pc-cat {
  font-family: var(--mono);
  font-size: .71rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 4px 9px;
  border-radius: 6px;
  background: var(--accent-wash);
}
.pc-period {
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--text-mute);
}

.pc-title {
  font-size: 1.14rem;
  font-weight: 620;
  letter-spacing: -.02em;
  line-height: 1.3;
}
.project-card.is-featured .pc-title { font-size: 1.32rem; }

.pc-blurb {
  margin-top: 10px;
  font-size: .94rem;
  color: var(--text-dim);
}

.pc-impact {
  margin-top: 14px;
  padding: 11px 13px;
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--surface-2);
  font-size: .89rem;
  color: var(--text-dim);
}
.pc-impact strong {
  display: block;
  font-size: .69rem;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: var(--accent);
  margin-bottom: 3px;
  font-weight: 650;
}

.tag-row {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  font-family: var(--mono);
  font-size: .74rem;
  padding: 3px 9px;
  border-radius: 6px;
  border: 1px solid var(--border-soft);
  color: var(--text-mute);
  background: var(--bg-elev);
}

.pc-links {
  margin-top: auto;
  padding-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.pc-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .87rem;
  font-weight: 550;
  color: var(--accent);
}
.pc-links a svg { width: 14px; height: 14px; }
.pc-links a:hover { text-decoration: underline; text-underline-offset: 3px; }

.empty-state {
  margin-top: 30px;
  padding: 34px;
  text-align: center;
  color: var(--text-mute);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* ── Skills ─────────────────────────────────────────────────────────────── */
.skill-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 16px;
}
.skill-card {
  padding: 20px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color .2s var(--ease);
}
.skill-card:hover { border-color: var(--border); }
.skill-card h3 {
  font-size: .79rem;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: var(--accent);
  font-weight: 640;
}
.skill-card ul {
  margin-top: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.skill-card li {
  font-size: .83rem;
  padding: 4px 10px;
  border-radius: 7px;
  background: var(--surface-2);
  color: var(--text-dim);
  border: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.skill-card li:hover { border-color: var(--accent-line); color: var(--text); }

/* ── Timeline ───────────────────────────────────────────────────────────── */
.timeline {
  margin-top: 34px;
  position: relative;
  padding-left: 26px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 5px; top: 8px; bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent-line), var(--border-soft) 40%, transparent);
}
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -26px; top: 9px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.tl-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
}
.tl-role { font-size: 1.09rem; font-weight: 620; letter-spacing: -.018em; }
.tl-org { color: var(--accent); font-weight: 550; }
.tl-meta {
  margin-top: 4px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--text-mute);
}
.tl-bullets { margin-top: 13px; display: grid; gap: 8px; }
.tl-bullets li {
  position: relative;
  padding-left: 19px;
  font-size: .94rem;
  color: var(--text-dim);
  max-width: 72ch;
}
.tl-bullets li::before {
  content: "";
  position: absolute;
  left: 2px; top: .66em;
  width: 6px; height: 1px;
  background: var(--text-mute);
}

/* ── Education ──────────────────────────────────────────────────────────── */
.edu-grid {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}
.edu-card {
  padding: 22px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--surface);
}
.edu-degree { font-size: 1.07rem; font-weight: 620; letter-spacing: -.018em; }
.edu-field { margin-top: 2px; color: var(--accent); font-size: .93rem; }
.edu-school { margin-top: 10px; color: var(--text-dim); font-size: .95rem; }
.edu-period {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--text-mute);
}
.edu-detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-soft);
  font-size: .89rem;
  color: var(--text-dim);
}

.cert-row {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.cert-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: var(--surface);
  font-size: .89rem;
  color: var(--text-dim);
}
.cert-chip svg { width: 16px; height: 16px; color: var(--accent); }
.cert-chip .issuer { color: var(--text-mute); font-size: .82rem; }

/* ── Contact ────────────────────────────────────────────────────────────── */
.section-contact { padding-bottom: clamp(64px, 10vw, 110px); }
.contact-card {
  margin-top: 30px;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(110% 150% at 0% 0%, var(--accent-wash) 0%, transparent 55%),
    var(--surface);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
}
.contact-head {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  letter-spacing: -.03em;
  font-weight: 660;
}
.contact-copy { margin-top: 10px; max-width: 46ch; color: var(--text-dim); }
.contact-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* ── Toast ──────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 22px);
  padding: 11px 20px;
  border-radius: 11px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: .9rem;
  font-weight: 570;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s var(--ease), transform .22s var(--ease);
  z-index: 200;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ── TODO highlighter (disappears once you replace the text) ────────────── */
.todo {
  background: var(--warn-wash);
  border-bottom: 1px dashed var(--warn-line);
  color: var(--warn-text);
  border-radius: 3px;
  padding: 0 3px;
}

/* ── Reveal on scroll ───────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 940px) {
  .about-grid { grid-template-columns: 1fr; gap: 26px; }
  .project-card.is-featured { grid-column: span 1; }
}

@media (max-width: 760px) {
  :root { --header-h: 56px; }

  .nav-toggle { display: grid; }

  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    gap: 2px;
    padding: 10px 16px 16px;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 11px 12px; font-size: .96rem; }
  .nav a.is-active::after { display: none; }

  .hero-stats { gap: 18px 30px; }
  .contact-card { flex-direction: column; align-items: flex-start; }
  .project-grid { grid-template-columns: 1fr; }
}

/* ── Print (so "Save as PDF" produces something sane) ───────────────────── */
@media print {
  .site-header, .hero-cta, .filters, .contact-actions, .toast, .hero-grid { display: none !important; }
  body { background: #fff; color: #000; }
  .section { padding: 18px 0; break-inside: avoid; }
  .project-card, .skill-card, .edu-card { break-inside: avoid; border-color: #ccc; }
  .reveal { opacity: 1; transform: none; }
}