/* huija.github.io · dark tech / terminal aesthetic
   palette: near-black cool base + single cyan accent
   radius: all-soft 14px (panels) / 10px (buttons) / pill (tags) */

:root {
  --bg: #0a0d12;
  --bg-soft: #0d1118;
  --panel: #10151f;
  --panel-hi: #141b27;
  --line: #1c2431;
  --line-soft: #161d28;
  --text: #e7edf4;
  --muted: #95a1b2;
  --faint: #5d6a7c;
  --accent: #45c8f1;
  --accent-soft: rgba(69, 200, 241, 0.12);
  --accent-line: rgba(69, 200, 241, 0.35);
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --r-panel: 14px;
  --r-btn: 10px;
  --nav-h: 64px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--accent-soft); color: var(--text); }

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- nav ---------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  height: var(--nav-h);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(10, 13, 18, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--text);
  letter-spacing: 0.02em;
}

.brand .path { color: var(--faint); }
.brand .cursor {
  display: inline-block;
  width: 8px; height: 15px;
  margin-left: 2px;
  background: var(--accent);
  vertical-align: -2px;
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  color: var(--muted);
}

.nav-links a {
  transition: color 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-links a:hover { color: var(--text); }

.nav-links a.active { color: var(--text); }

.nav-links .gh {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  font-family: var(--mono);
  font-size: 13px;
  transition: border-color 0.25s, background 0.25s;
}

.nav-links .gh:hover {
  border-color: var(--accent-line);
  background: var(--accent-soft);
}

/* ---------- hero (shared) ---------- */

.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; z-index: -1; }

.hero-bg canvas { display: block; width: 100%; height: 100%; }

.hero-grid {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 40% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 40% 40%, #000 30%, transparent 75%);
}

.hero-glow {
  position: absolute;
  z-index: -3;
  width: 720px; height: 720px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(69, 200, 241, 0.07) 0%, transparent 65%);
  top: -220px; left: -160px;
  pointer-events: none;
}

.hero-content { padding: 64px 0; }

.hero-split {
  width: 100%;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.hero-split .hero-content { padding: 0; }

.hero h1.md { font-size: clamp(2.8rem, 7vw, 5.2rem); }

.hero-visual .term {
  transform: perspective(1200px) rotateY(-4deg) rotateX(1.5deg);
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-visual:hover .term { transform: none; }

.kicker {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 20px;
}

.kicker .dim { color: var(--faint); }

.hero h1 {
  font-size: clamp(3.4rem, 11vw, 8.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.02;
}

.hero h1 .scramble { display: inline-block; min-width: 1ch; }

.hero .sub {
  margin-top: 24px;
  max-width: 34em;
  color: var(--muted);
  font-size: 17px;
}

.hero .sub .hl { color: var(--text); }

.hero-cta {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--r-btn);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s, background 0.25s, box-shadow 0.25s;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px) scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: #06222e;
  font-weight: 600;
}

.btn-primary:hover {
  box-shadow: 0 6px 32px rgba(69, 200, 241, 0.25);
}

.btn-ghost {
  border-color: var(--line);
  color: var(--text);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--accent-line);
  background: var(--accent-soft);
}

.btn svg { flex-shrink: 0; }

/* ---------- sections ---------- */

.section { padding: 110px 0; }

.section-head { margin-bottom: 52px; }

.section-head h2 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-head p {
  margin-top: 14px;
  color: var(--muted);
  max-width: 46em;
}

/* ---------- project grid ---------- */

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

.card-feature {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 8px 48px;
  align-items: center;
  padding: 36px;
}

.card-feature .demo { margin: 0; }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s;
  overflow: hidden;
}

.card:hover { transform: translateY(-3px); border-color: var(--accent-line); }

/* spotlight border follows the cursor */
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), rgba(69, 200, 241, 0.10), transparent 45%);
  opacity: 0;
  transition: opacity 0.35s;
  pointer-events: none;
}

.card:hover::before { opacity: 1; }

.card .arrow {
  position: absolute;
  top: 26px; right: 26px;
  color: var(--faint);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), color 0.3s;
}

.card:hover .arrow { transform: translate(3px, -3px); color: var(--accent); }

.card h3 {
  font-size: 22px;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.card-feature h3 { font-size: 30px; }

.card .tagline {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 16px;
}

.card p {
  color: var(--muted);
  font-size: 14.5px;
}

.card .desc { flex: 1; }

.card .tags {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 12px;
}

.card-feature .demo {
  margin: 24px 0 0;
  background: var(--bg);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 18px 20px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 2;
  overflow-x: auto;
}

.demo .p { color: var(--accent); }
.demo .c { color: var(--faint); }

/* ---------- terminal panel ---------- */

.term {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: var(--panel-hi);
}

.term-bar i {
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--line);
}

.term-bar .title {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
}

.term-body {
  padding: 20px 22px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 2.05;
  overflow-x: auto;
}

.term-body .p { color: var(--accent); user-select: none; }
.term-body .cmd { color: var(--text); }
.term-body .out { color: var(--faint); }
.term-body .ok { color: #58d5a3; }
.term-body .key { color: var(--accent); }

/* ---------- code panels ---------- */

.code-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.code-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  overflow: hidden;
}

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  background: var(--panel-hi);
}

.copy-btn {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  background: none;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 3px 10px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.copy-btn:hover { color: var(--text); border-color: var(--accent-line); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent-line); }

.code-block pre {
  padding: 18px 20px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.9;
  overflow-x: auto;
  color: var(--muted);
}

.code-block .k { color: var(--accent); }
.code-block .s { color: #58d5a3; }
.code-block .n { color: #e0af68; }

/* ---------- feature grid (skillmod) ---------- */

.feat-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.feat {
  position: relative;
  padding: 26px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  transition: border-color 0.3s;
}

.feat:hover { border-color: var(--accent-line); }

.feat h3 {
  font-size: 17px;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.feat h3 .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
}

.feat p { color: var(--muted); font-size: 14px; }

.feat-wide { grid-column: span 3; }
.feat-slim { grid-column: span 2; }

.cmd-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
  font-family: var(--mono);
  font-size: 13px;
  margin-top: 6px;
}

.cmd-list .name { color: var(--accent); }
.cmd-list .desc { color: var(--faint); font-family: var(--sans); }

/* ---------- problem section (skillmod) ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.split h2 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 18px;
}

.pain-list { list-style: none; margin-top: 8px; }

.pain-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.pain-list li:first-child { border-top: 1px solid var(--line-soft); }

.pain-list .x {
  font-family: var(--mono);
  color: #e06c75;
  flex-shrink: 0;
}

.pain-list .check {
  font-family: var(--mono);
  color: #58d5a3;
  flex-shrink: 0;
}

.pain-list strong { font-weight: 600; }

.pain-list .body { color: var(--muted); font-size: 14.5px; }

/* ---------- cta band ---------- */

.cta-band {
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  background:
    radial-gradient(600px 200px at 20% 0%, rgba(69, 200, 241, 0.08), transparent 60%),
    var(--panel);
  padding: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-band h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  letter-spacing: -0.03em;
}

.install-line {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  padding: 14px 18px;
  font-family: var(--mono);
  font-size: 14px;
  width: fit-content;
  max-width: 100%;
}

.install-line .p { color: var(--accent); user-select: none; }
.install-line code { white-space: nowrap; overflow-x: auto; }

/* ---------- wechat qr band ---------- */

.qr-band {
  display: flex;
  align-items: center;
  gap: 36px;
  padding: 34px 38px;
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  background:
    radial-gradient(500px 180px at 15% 0%, rgba(69, 200, 241, 0.06), transparent 60%),
    var(--panel);
}

.qr-band img {
  width: 128px;
  height: 128px;
  border-radius: 10px;
  background: #fff;
  padding: 6px;
  flex-shrink: 0;
}

.qr-label {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 8px;
}

.qr-band h2 {
  font-size: 24px;
  letter-spacing: -0.02em;
}

.qr-band p:not(.qr-label) {
  color: var(--muted);
  margin-top: 8px;
  font-size: 14.5px;
}

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--line-soft);
  padding: 36px 0;
  margin-top: 40px;
}

.foot-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--faint);
}

.foot-inner a { transition: color 0.25s; }
.foot-inner a:hover { color: var(--text); }

/* ---------- reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--d, 0ms);
}

.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .projects { grid-template-columns: 1fr; }
  .card-feature { grid-template-columns: 1fr; gap: 20px; padding: 28px; }
  .code-duo { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .feat-wide, .feat-slim { grid-column: span 6; }
  .section { padding: 80px 0; }
  .hero-split { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual .term { transform: none; }
  .hero-visual { max-width: 560px; }
}

@media (max-width: 600px) {
  .nav-links { gap: 16px; }
  .nav-links .gh span { display: none; }
  .cta-band { padding: 32px 24px; }
  .install-line { width: 100%; }
  .qr-band { flex-direction: column; text-align: center; gap: 20px; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero .cursor { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, .card .arrow, .btn { transition: none; }
  .hero-bg canvas { display: none; }
}