/* ==========================================================================
   Jeffery Chen, Portfolio
   Shared stylesheet for all pages. Dark theme, system fonts, no frameworks.
   ========================================================================== */

:root {
  --bg: #111110;
  --bg-raised: #171615;
  --card-bg: #1a1917;
  --text: #ededea;
  --text-muted: #9c9892;
  --text-faint: #6e6a64;
  --border: #2c2a27;
  --border-soft: #232220;
  --accent: #e0913f;
  --accent-dim: #a8672a;
  --accent-wash: rgba(224, 145, 63, 0.1);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;

  --max-width: 920px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 900px 500px at 15% -10%, var(--accent-wash), transparent 60%);
  background-repeat: no-repeat;
  line-height: 1.65;
  font-size: 17px;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover { text-decoration: underline; }

h1, h2, h3, h4 { font-weight: 800; line-height: 1.15; margin: 0; letter-spacing: -0.015em; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

img, svg { max-width: 100%; }

/* ---------- Type scale ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 1px;
  background: var(--accent);
}

h1.page-title { font-size: 44px; margin-bottom: 8px; }
h2.section-title { font-size: 30px; margin-bottom: 8px; }
h3.card-title { font-size: 19px; letter-spacing: -0.01em; }

.section-intro {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 62ch;
  margin-bottom: 40px;
}

/* ---------- Layout ---------- */
main {
  min-width: 0;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  min-width: 0;
}

section {
  padding: 72px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  min-width: 0;
}

section + section,
main > section:not(:first-child) {
  border-top: 1px solid var(--border-soft);
}

/* ---------- NAV ---------- */
nav.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(17, 17, 16, 0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  min-width: 0;
}

.nav-name {
  font-weight: 800;
  font-size: 16px;
  color: var(--text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-name span {
  color: var(--accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 6px;
  display: inline-block;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
  background: var(--bg-raised);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--accent);
  background: var(--accent-wash);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 12px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font-sans);
}

/* ---------- HERO ---------- */
.hero {
  padding-top: 88px;
  padding-bottom: 64px;
}

.hero-name {
  font-size: 56px;
  margin-bottom: 14px;
}

.hero-identity {
  font-size: 20px;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 46ch;
}

.hero-links {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 7px;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.15s ease, background-color 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn.btn-solid {
  background: var(--accent);
  border-color: var(--accent);
  color: #16110a;
}

.btn.btn-solid:hover {
  background: #ec9d51;
  border-color: #ec9d51;
  color: #16110a;
}

.email-placeholder {
  font-size: 15px;
  color: var(--text-faint);
  font-style: italic;
  font-family: var(--font-mono);
}

/* Home page quick-nav tiles */
.home-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.home-tile {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 20px;
  background: var(--card-bg);
  transition: border-color 0.15s ease, transform 0.15s ease, background-color 0.15s ease;
  position: relative;
  overflow: hidden;
}

.home-tile::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.home-tile:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  background: var(--bg-raised);
  text-decoration: none;
}

.home-tile:hover::before { transform: scaleX(1); }

.home-tile-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 10px;
  display: block;
}

.home-tile-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
}

.home-tile-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
}

.home-highlight {
  border-top: 1px solid var(--border-soft);
  padding-top: 48px;
  margin-top: 8px;
}


/* ---------- PROJECT CARDS ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.project-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-dim);
  border-radius: 8px;
  padding: 26px 28px;
  background: var(--card-bg);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.project-card:hover {
  border-color: var(--accent);
  border-left-color: var(--accent);
}

.project-card.muted {
  background: transparent;
  border-left-color: var(--border);
  color: var(--text-muted);
}

.project-card.muted:hover {
  border-color: var(--border);
  border-left-color: var(--border);
  transform: none;
}

.project-card.muted .card-title { color: var(--text-muted); }

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 3px 9px;
  white-space: normal;
  word-break: break-word;
}

.tag.tag-muted {
  color: var(--text-faint);
  border-color: var(--border);
}

.project-desc {
  font-size: 15px;
  color: var(--text);
  margin: 8px 0 14px;
}

.project-card.muted .project-desc { color: var(--text-muted); }

.project-meta {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding: 10px 14px;
  background: var(--bg-raised);
  border-radius: 6px;
  border: 1px solid var(--border-soft);
}

.project-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.project-links a {
  font-size: 14px;
  font-weight: 700;
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 7px 14px;
  color: var(--accent);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.project-links a:hover {
  background: var(--accent);
  color: #16110a;
  text-decoration: none;
}

/* ---------- EXPERIENCE ---------- */
.exp-item {
  position: relative;
  border-left: 2px solid var(--border);
  padding-left: 24px;
  margin-bottom: 36px;
  min-width: 0;
}

.exp-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}

.exp-item:last-child { margin-bottom: 0; }

.exp-role { font-size: 20px; font-weight: 800; }
.exp-org { font-size: 15px; color: var(--accent); font-weight: 700; margin-top: 3px; }
.exp-dates { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); margin: 4px 0 12px; }

.exp-item ul {
  margin: 0;
  padding-left: 20px;
}

.exp-item li {
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--text-muted);
}

/* ---------- ACTIVITIES ---------- */
.activity-list {
  display: grid;
  gap: 2px;
}

.activity-item {
  padding: 20px 22px;
  border: 1px solid transparent;
  border-bottom: 1px solid var(--border-soft);
  transition: background-color 0.15s ease, border-color 0.15s ease;
  border-radius: 8px;
  min-width: 0;
}

.activity-item:hover {
  background: var(--bg-raised);
  border-color: var(--border-soft);
}

.activity-item:last-child { border-bottom: none; }

.activity-name { font-weight: 800; font-size: 16px; }
.activity-role { color: var(--accent); font-size: 13px; font-weight: 700; font-family: var(--font-mono); }
.activity-line { font-size: 15px; color: var(--text-muted); margin-top: 4px; }

/* ---------- SKILLS ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.skill-group {
  min-width: 0;
}

.skill-group-title {
  font-family: var(--font-mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-muted);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 5px 12px;
  color: var(--text);
  transition: border-color 0.15s ease, color 0.15s ease;
  background: var(--card-bg);
}

.skill-group-note {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 10px;
  line-height: 1.5;
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- EDUCATION ---------- */
.edu-block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 30px;
  background: var(--card-bg);
  min-width: 0;
}

.edu-school { font-size: 21px; font-weight: 800; }
.edu-loc { color: var(--text-muted); font-size: 15px; margin-bottom: 14px; }
.edu-line { font-size: 15px; margin-bottom: 8px; color: var(--text-muted); }
.edu-line strong { color: var(--text); font-weight: 700; }

/* ---------- CONTACT ---------- */
.contact-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  background: var(--card-bg);
  min-width: 0;
}

.contact-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 20px;
}

/* ---------- FOOTER ---------- */
footer.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 32px 24px 56px;
  max-width: var(--max-width);
  margin: 0 auto;
  min-width: 0;
}

.footer-note {
  font-size: 13px;
  color: var(--text-faint);
  font-family: var(--font-mono);
}

/* ---------- MOBILE ---------- */
@media (max-width: 760px) {
  .home-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 8px;
  }

  .nav-links.open { display: flex; }

  .nav-links li { width: 100%; min-width: 0; }

  .nav-links a {
    display: block;
    padding: 12px 14px;
    width: 100%;
  }

  .nav-toggle { display: block; }

  .tag { white-space: normal; }

  h1.page-title, .hero-name { font-size: 34px; }
  h2.section-title { font-size: 24px; }

  section { padding: 48px 20px; }
  .hero { padding-top: 56px; padding-bottom: 40px; }

  .project-card, .edu-block, .contact-card { padding: 20px; }
}

@media (max-width: 400px) {
  .hero-name { font-size: 28px; }
}