/* =========================
   jerryzhou.ai — V3 Clean & Dark
   Focus: Readability, No Frills
   ========================= */

:root {
  /* Base - Keeping your preferred palette */
  --bg: #0b0f14;         /* deep blue-black */
  --text: #d7e0ea;       /* off-white */
  --muted: #8b9bb4;      /* secondary text */
  --faint: #5a6b7c;      /* tertiary text */

  /* Accents */
  --accent: #00ff9a;     /* terminal green */
  --accent-dim: rgba(0,255,154,0.15);
  --blue: #60a5fa;
  --violet: #a78bfa;

  /* Typography */
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Layout */
  --max-width: 720px;    /* Optimised for reading */
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--mono);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  padding: 0 20px; /* Mobile padding */
}

/* Main Container */
.wrap {
  max-width: var(--max-width);
  margin: 80px auto 120px;
}

/* Typography */
h1.h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 0 0 16px;
  color: #fff;
}

.tagline {
  font-size: 1.25rem;
  color: var(--accent);
  margin: 0 0 8px;
  font-weight: 500;
}

.kicker {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 40px;
}

a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--faint);
  transition: border-color 0.2s, color 0.2s;
}

a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Navigation - Pure Text List */
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin: 0 0 60px;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 16px 0;
}

.nav a {
  border-bottom: none;
  color: var(--muted);
}
.nav a:hover {
  color: #fff;
}
.nav .cmd {
  color: var(--accent);
  margin-right: 6px;
  font-size: 0.85em;
  opacity: 0.8;
}

/* Sections */
.section {
  margin-bottom: 80px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  color: var(--faint);
  font-size: 0.85rem;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-header::after {
  content: "";
  flex-grow: 1;
  height: 1px;
  background: rgba(255,255,255,0.08);
}

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

/* Content Blocks (Project/Exp) */
.item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.item-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.item-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

.item-meta {
  font-size: 0.85rem;
  color: var(--faint);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.item-desc {
  color: var(--muted);
  margin: 0;
}

.item-sub {
  font-size: 0.9rem;
  color: var(--faint);
  margin-top: 4px;
}

.item-links {
  display: flex;
  gap: 16px;
  font-size: 0.9rem;
  margin-top: 8px;
}
.item-links a {
  color: var(--muted);
  border-bottom: 1px dotted var(--faint);
}
.item-links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Checkbox List (Systems) */
.todo {
  list-style: none;
  padding: 0;
  margin: 0;
}
.todo li {
  display: flex;
  gap: 12px;
  padding: 6px 0;
  color: var(--muted);
  align-items: baseline;
}
.chk {
  width: 14px;
  height: 14px;
  border: 1px solid var(--faint);
  border-radius: 3px;
  flex-shrink: 0;
  position: relative;
  top: 3px;
}
.todo li:hover .chk {
  border-color: var(--accent);
}

/* Contact Block */
.contact-block {
  margin-top: 24px;
  padding: 24px;
  background: rgba(255,255,255,0.03);
  border-radius: 8px;
}
.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-list li {
  display: flex;
  gap: 12px;
  color: var(--text);
}
.contact-label {
  color: var(--faint);
  width: 80px;
}

/* Resume Button */
.btn-resume {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
  padding: 12px 20px;
  background: var(--text);
  color: var(--bg);
  border-radius: 6px;
  font-weight: 600;
  border: none;
  transition: transform 0.1s, background 0.2s;
}
.btn-resume:hover {
  background: var(--accent);
  transform: translateY(-1px);
  border-bottom: none;
  color: #000;
}

/* Footer */
.footer {
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: var(--faint);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
}

/* Mobile Tweak */
@media (max-width: 600px) {
  .wrap { margin-top: 40px; }
  h1.h1 { font-size: 2rem; }
  .nav { gap: 16px 20px; }
  .item-head { flex-direction: column; gap: 4px; }
}