/* ===========================================================
   Eric Shepard — Portfolio Styles
   - Dark theme tokens
   - Reset & base
   - Layout
   - Typography
   - Components (header, nav, buttons, panels, cards, tags, badges)
   - Media queries & a11y niceties
   =========================================================== */

/* -----------------------------
   Theme tokens
--------------------------------*/
:root{
  --bg:#0f1216;
  --panel:#171b21;
  --text:#f0f5fa;
  --muted:#bac6d3;
  --link:#8bd3ff;
  --accent:#5aa9e6;
  --border:#242a33;

  --radius:12px;
  --shadow:0 6px 18px rgba(0,0,0,.2);

  --spacing-1:8px;
  --spacing-2:12px;
  --spacing-3:16px;
  --spacing-4:20px;
  --spacing-5:24px;
}

/* -----------------------------
   Reset & base
--------------------------------*/
*,*::before,*::after{ box-sizing:border-box; }

html,body{
  margin:0; padding:0;
  background:var(--bg);
  color:var(--text);
  font-family:system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height:1.6;
}

html{ scroll-behavior:smooth; }

/* Links: always distinguishable without relying on color alone */
a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: var(--muted);     /* subtle underline color */
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: all 0.2s ease;
}

a:hover,
a:focus-visible {
  text-decoration-color: var(--link);      /* turns accent blue on hover/focus */
  text-decoration-thickness: 2px;
}

/* Make the Contact button distinguishable too (no underline on text, but border instead) */
.btn.cta {
  text-decoration: none;                   /* no underline on button text */
  border: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.btn.cta:hover,
.btn.cta:focus-visible {
  border-color: var(--link);
  background-color: rgba(90, 169, 230, 0.08);  /* subtle blue tint */
}

.muted{ color:var(--muted); }

:focus-visible{
  outline:2px solid var(--link);
  outline-offset:2px;
}

/* Skip link */
.skip-link{
  position:absolute; left:-999px; top:8px;
  background:#fff; color:#000;
  padding:8px 12px; border-radius:6px; z-index:10000;
}
.skip-link:focus{ left:8px; }

/* -----------------------------
   Layout wrappers
--------------------------------*/
main{ padding:var(--spacing-4) var(--spacing-4) 60px; }
.container{ margin:0 auto; max-width:1000px; }

/* Panels (cards used as page sections) */
.panel{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:var(--spacing-4);
}

/* Vertical rhythm under header and between panels */
.container > .panel:first-of-type{ margin-top:var(--spacing-2); }
.container > .panel + .panel{ margin-top:var(--spacing-5); }

/* Optional top hero image */
.hero{ margin:var(--spacing-2) 0 var(--spacing-5); }

/* Screenshot blocks */
.shot{ margin:.5rem 0 1rem; }
.shot img{
  display:block; width:100%; height:auto;
  border-radius:12px;
  border:1px solid var(--border);
  box-shadow:0 10px 24px rgba(0,0,0,.35);
}

/* Table of contents (case studies) */
.toc{ margin:8px 0 16px; font-size:.95rem; }
.toc a{ margin-right:.5rem; }

/* -----------------------------
   Typography
--------------------------------*/
h1,h2,h3{ margin-top:0; }
h2{ font-size:clamp(18px,2.2vw,24px); }
.card h3,
.panel h3{ font-size:18px; }

.lead{
  color:var(--muted);
  font-size:clamp(14px,1.9vw,16px);
}

/* -----------------------------
   Header + Global Nav
--------------------------------*/
.site-header{
  position:sticky; top:0; z-index:1000;
  padding:var(--spacing-3) var(--spacing-4);
  border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, rgba(17,22,28,.85) 0%, rgba(15,18,22,.85) 100%);
  backdrop-filter:blur(6px);
  box-shadow:0 6px 24px rgba(0,0,0,.25) inset; /* subtle depth */
}

.site-header .brand h1{
  margin:0;
  font-size:clamp(20px,2.4vw,28px);
}
.site-header .brand p{
  margin:4px 0 0 0;
  color:var(--muted);
  font-size:clamp(12px,1.6vw,14px);
}

/* credential chips under the name */
.meta{
  display:flex; flex-wrap:wrap; gap:.5rem;
  margin:.25rem 0 0; padding:0; list-style:none;
}
.chip{
  padding:.2rem .6rem;
  border-radius:999px;
  border:1px solid var(--border);
  background:#121a22;
  font-size:.85rem; color:var(--muted);
}

/* Primary nav */
.nav{
  margin:var(--spacing-2) 0;
  display:flex; gap:var(--spacing-3);
  flex-wrap:wrap;
}
.nav a.active{
  font-weight:700;
  border:2px solid #4a5568;
  background:#1a202c;
}
.nav a.active:hover,
.nav a.active:focus{ text-decoration:none; }

/* CTA button (Contact) */
.btn{
  display:inline-flex; align-items:center; gap:.5rem;
  padding:.45rem .8rem; border-radius:999px;
  background:var(--accent); color:#09131d; font-weight:700;
  border:1px solid #2a3442; text-decoration:none;
}
.btn:hover{ filter:brightness(1.05); text-decoration:none; }

/* (Optional) legacy header links line; keep for pages that show it */
.contact{
  font-size:clamp(12px,1.6vw,14px);
  color:var(--muted);
  display:flex; flex-wrap:wrap; gap:8px; align-items:center;
}
.contact .sep{ color:#3a4352; }

/* -----------------------------
   Cards, grids & tags
--------------------------------*/
.grid{ display:grid; gap:16px; }
@media (min-width:700px){ .grid{ grid-template-columns:repeat(2,1fr); } }
@media (min-width:1024px){ .grid{ grid-template-columns:repeat(3,1fr); } }

.card{
  background:#141922;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:var(--spacing-3);
  transition:transform .1s ease, border-color .1s ease;
}
.card:hover{ transform:translateY(-2px); border-color:#2a3442; }
.card p{ color:var(--muted); margin-bottom:12px; }
.tags{ display:flex; gap:8px; flex-wrap:wrap; }
.card .tags{ display:flex; gap:8px; flex-wrap:wrap; }
.card h3 a{ color:inherit; text-decoration:none; }
.card h3 a:hover, .card h3 a:focus{ text-decoration:underline; }

.tag{
  font-size:12px;
  padding:4px 8px;
  border-radius:999px;
  background:#0f131a;
  border:1px solid #273041;
  color:#bcd0e5;
}

/* Badges (project status) */
.badge{ display:inline-block; padding:.2rem .5rem; border-radius:9999px; font-size:.75rem; }
.badge-live{ background:#1f9d55; color:#fff; }
.badge-progress{ background:#3b82f6; color:#fff; }
.badge-github{ background:#24292f; color:#fff; }
.sep{ color:#3a4352; margin:0 .35rem; }
.list-compact{ margin:0 0 1rem; padding-left:1.15rem; }
.list-compact li{ margin:.3rem 0; }

/* Filters (projects page) */
.filter{ margin:12px 0; }
.filter input{
  width:100%; padding:10px;
  border-radius:8px;
  border:1px solid var(--border);
  background:#0f131a; color:var(--text);
}

/* -----------------------------
   Footer
--------------------------------*/
footer{
  border-top:1px solid var(--border);
  background:var(--bg);
  color:var(--muted);
  text-align:center;
  padding:var(--spacing-3);
}

/* -----------------------------
   Motion preferences
--------------------------------*/
@media (prefers-reduced-motion:reduce){
  *{ animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; scroll-behavior:auto !important; }
}

/* ===========================================================
   Fancy UI Pack — glass, gradients, micro-interactions
   (Drop at the end of style.css)
   =========================================================== */

/* ---------- Background: subtle gradient field ---------- */
.bg-fancy {
  background:
    radial-gradient(1200px 800px at 10% -10%, #11202a 0%, transparent 60%),
    radial-gradient(1000px 600px at 90% -20%, #1b2440 0%, transparent 60%),
    radial-gradient(900px 600px at 50% 120%, #18252e 0%, transparent 60%),
    var(--bg);
}

/* ---------- Glassmorphism (safe, tasteful) ---------- */
.theme-glass .panel,
.theme-glass .site-header {
  background: rgba(20, 24, 30, 0.5);
  border: 1px solid rgba(255,255,255,.06);
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

@supports (backdrop-filter: blur(10px)) {
  .theme-glass .panel,
  .theme-glass .site-header {
    backdrop-filter: blur(10px) saturate(120%);
    -webkit-backdrop-filter: blur(10px) saturate(120%);
  }
}

/* Add a faint inner highlight for “pane” feeling */
.theme-glass .panel::before {
  content:"";
  position:absolute; inset:0;
  border-radius:inherit;
  pointer-events:none;
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,0));
  mix-blend-mode:overlay; opacity:.6;
}
/* Ensure positioned ancestor for ::before */
.theme-glass .panel { position: relative; }

/* ---------- Gradient headings (subtle) ---------- */
.theme-glass h1, .theme-glass h2 {
  background: linear-gradient(90deg, #b9e6ff 0%, #8bd3ff 60%, #c8d6ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Animated underline for links ---------- */
.link-ux, .nav a {
  position: relative;
  text-decoration: none;
}
.link-ux::after, .nav a::after {
  content:"";
  position:absolute; left:0; bottom:-2px;
  width:0; height:2px; background: var(--link);
  transition: width .18s ease;
}
.link-ux:hover::after, .nav a:hover::after { width:100%; }

/* Keep the active nav pill looking like a pill even with underline */
.nav a.active::after { display:none; }

/* ---------- Card glow on hover ---------- */
.card {
  transform: translateY(0);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(0,0,0,.35), 0 0 0 1px rgba(139,211,255,.08) inset;
  border-color: #2a3442;
}
/* subtle corner glow */
.card::after{
  content:"";
  position:absolute; inset:0; border-radius:inherit; pointer-events:none;
  background: radial-gradient(400px 200px at 20% 0%, rgba(139,211,255,.10), transparent 60%);
  opacity:0; transition: opacity .2s ease;
}
.card:hover::after{ opacity:1; }
.card { position: relative; }

/* ---------- Button sheen (Contact) ---------- */
.btn{
  position:relative; overflow:hidden;
}
.btn::after{
  content:"";
  position:absolute; inset:0 -40%;
  background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,.35) 35%, transparent 70%);
  transform: translateX(-120%);
  transition: transform .35s ease;
}
.btn:hover::after{ transform: translateX(120%); }

/* Header row with right-aligned CTA */
.header-row{
  display:flex; align-items:center; gap:12px;
  margin-top:8px;
  flex-wrap:wrap;
}
.header-row .nav{ margin:0; }
.header-row .cta{ margin-left:auto; } /* pushes Contact to the far right */

@media (min-width: 880px){
  .header-row{ flex-wrap: nowrap; }
}

@media (max-width: 700px){ .container>.panel{ margin-top:24px; } }

.btn:hover{ filter:brightness(1.08); box-shadow:0 6px 16px rgba(0,0,0,.25); }

/* Teaching blocks */
.edu-block details {
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 12px;
  padding: .75rem 1rem;
  margin: .75rem 0;
  background: rgba(20,24,30,.35);
}
.edu-block details[open] { background: rgba(20,24,30,.5); }
.edu-block summary {
  cursor: pointer; font-weight: 700; list-style: none;
}
.edu-block summary::-webkit-details-marker { display: none; }
.edu-block pre {
  background: #0b141c; border: 1px solid #1f2a36;
  border-radius: 8px; padding: .75rem; overflow:auto;
  margin:.5rem 0 0;
}

:root{
  --reading-max: 72rem;   /* ~1152px: comfy for prose */
  --wide-max:    95rem;   /* ~1520px: for grids/hero */
}

.container        { max-width: var(--reading-max); margin-inline: auto; padding-inline: 16px; }
.container-wide   { max-width: var(--wide-max);    margin-inline: auto; padding-inline: 16px; }

.project-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.intro-grid{
  display: grid;
  grid-template-columns: minmax(340px, 560px) 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 1000px){
  .intro-grid{ grid-template-columns: 1fr; }
}

.case-grid{
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}
.case-aside{ position: sticky; top: 16px; }
@media (max-width: 1100px){
  .case-grid{ grid-template-columns: 1fr; }
  .case-aside{ position: static; }
}

/* Two-column layout spacing */
.two-col {
  /* existing grid rules ... */
  margin-bottom: 28px;        /* restores space under the grid */
}

.two-col .panel {
  margin: 0;                  /* keep inner panels flush in the grid */
}

/* (optional) slightly smaller gap on mobile */
@media (max-width: 900px) {
  .two-col { margin-bottom: 20px; }
}

.panel { margin: 20px 0; }    /* was likely ~12–16px */

/* -----------------------------
   Lab — lesson reading
--------------------------------*/
.lesson-kicker{
  margin:0 0 .35rem;
  color:var(--muted);
  font-size:.9rem;
  font-weight:600;
  letter-spacing:.02em;
  text-transform:uppercase;
}
.lesson-meta{
  margin:-.35rem 0 1rem;
  color:var(--muted);
  font-size:.95rem;
  font-weight:600;
}
.card .lesson-meta{
  margin:.15rem 0 .75rem;
}
.panel > .card + .card{
  margin-top:16px;
}
.lesson h3{
  margin-top:1.5rem;
}
.lesson h3:first-of-type{
  margin-top:1rem;
}
.lesson pre{
  background:#0b141c;
  border:1px solid #1f2a36;
  border-radius:8px;
  padding:.75rem 1rem;
  overflow:auto;
  font-size:.9rem;
  line-height:1.45;
}
.lesson code{
  font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size:.9em;
}

.lesson-figure{
  margin:1rem 0 1.25rem;
  padding:0;
}
.lesson-figure img{
  display:block;
  width:100%;
  height:auto;
  border-radius:12px;
  border:1px solid var(--border);
  background:#141922;
}
.lesson-figure figcaption{
  margin-top:.6rem;
  color:var(--muted);
  font-size:.95rem;
}

.lesson-table-wrap{
  overflow-x:auto;
  margin:1rem 0 1.25rem;
  -webkit-overflow-scrolling:touch;
}
.lesson-table{
  width:100%;
  min-width:32rem;
  border-collapse:separate;
  border-spacing:0;
  background:#141922;
  border:1px solid var(--border);
  border-radius:12px;
}
.lesson-table caption{
  caption-side:bottom;
  text-align:left;
  padding:.6rem .2rem 0;
  color:var(--muted);
  font-size:.9rem;
}
.lesson-table th,
.lesson-table td{
  padding:.65rem .75rem;
  border-bottom:1px solid var(--border);
  text-align:left;
  vertical-align:top;
}
.lesson-table thead th{
  background:#1a2430;
  color:#f0f5fa;
  font-size:.9rem;
}
.lesson-table tbody tr:last-child th,
.lesson-table tbody tr:last-child td{
  border-bottom:none;
}
.lesson-table .pk{
  background:#163044;
  color:#8bd3ff;
  font-weight:700;
}
.lesson-table thead th.pk{
  background:#1d3a52;
}

.try-this{
  border:1px solid rgba(90,169,230,.45);
  border-left:6px solid var(--accent);
  border-radius:12px;
  background:rgba(22,48,68,.5);
  padding:1.25rem 1.25rem 1.15rem;
  margin: .5rem 0 1.25rem;
}
.try-this > p:first-child{ margin-top:0; }
.try-this > :last-child{ margin-bottom:0; }
.try-this-kicker{
  margin:0 0 .35rem;
  color:var(--accent);
  font-size:.85rem;
  font-weight:700;
  letter-spacing:.04em;
  text-transform:uppercase;
}
.try-this-lead{
  font-size:1.15rem;
  line-height:1.5;
  color:var(--text);
  margin:.25rem 0 1rem;
}
.try-this-actions{
  margin:0 0 1rem;
}
.try-this-btn{
  display:inline-flex;
  font-size:1.05rem;
  padding:.7rem 1.15rem;
}

@media (max-width:700px){
  .lesson-table{ font-size:.9rem; }
}