/* ============================================================
   Jarvis Lin — Personal Hub
   Warm cream + ink, editorial blog hand-feel
   ============================================================ */

:root {
  /* --- warm neutral surface --- */
  --bg:        oklch(0.972 0.008 84);
  --bg-2:      oklch(0.945 0.012 82);
  --bg-card:   oklch(0.988 0.006 86);
  --ink:       oklch(0.235 0.012 64);
  --ink-soft:  oklch(0.435 0.013 62);
  --ink-faint: oklch(0.585 0.012 62);
  --line:      oklch(0.875 0.013 78);
  --line-soft: oklch(0.915 0.010 80);

  /* --- accent (olive-forest) --- */
  --accent:      oklch(0.520 0.078 142);
  --accent-deep: oklch(0.430 0.072 142);
  --accent-wash: oklch(0.520 0.078 142 / 0.11);

  /* --- type --- */
  --font-serif: "Newsreader", "Noto Serif TC", Georgia, "Songti TC", serif;
  --font-sans:  "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang TC", sans-serif;
  --font-mono:  "Spline Sans Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  /* headline font is switchable: default serif */
  --font-display: var(--font-serif);

  --maxw: 1080px;
  --gutter: clamp(20px, 5vw, 72px);
}


* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "palt" 1;
}

/* paper grain — very subtle */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(oklch(0.5 0.02 70 / 0.025) 1px, transparent 1px);
  background-size: 4px 4px;
  opacity: 0.6;
}

::selection { background: var(--accent-wash); color: var(--accent-deep); }

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

/* ---------- language toggle visibility ---------- */
:root[data-lang="zh"] .en { display: none !important; }
:root[data-lang="en"] .zh { display: none !important; }

/* ---------- layout shell ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
  position: relative;
  z-index: 1;
}

section { position: relative; z-index: 1; }

/* eyebrow / kicker — mono, tracked, accent */
.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  margin: 0;
}
.kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
  display: inline-block;
}
.kicker.bare::before { display: none; }

/* section heading */
.sec-head { margin-bottom: clamp(36px, 6vw, 64px); }
.sec-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 16px 0 0;
  color: var(--ink);
}
.sec-sub {
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 14px 0 0;
  font-size: 16px;
}

/* ---------- top nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.1) blur(8px);
  background: color-mix(in oklch, var(--bg), transparent 22%);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  white-space: nowrap;
  flex-shrink: 0;
}
@media (max-width: 520px) { .brand small { display: none; } }
.brand .dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  transform: translateY(-1px);
}
.brand small {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  font-weight: 400;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  font-size: 14px;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width .25s ease;
}
.nav-links a:hover::after { width: 100%; }
@media (max-width: 820px) { .nav-links { display: none; } }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-card);
}
.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--ink-faint);
  padding: 6px 12px;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: all .2s ease;
}
.lang-switch button.active { background: var(--ink); color: var(--bg); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  padding: 13px 22px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  cursor: pointer;
  transition: transform .2s cubic-bezier(.2,.7,.2,1), box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px oklch(0.235 0.012 64 / 0.18); }
.btn .arrow { transition: transform .25s ease; }
.btn:hover .arrow { transform: translateX(4px); }

.btn.accent { background: var(--accent); border-color: var(--accent); }
.btn.accent:hover { box-shadow: 0 10px 26px var(--accent-wash); }

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn.ghost:hover { border-color: var(--ink); box-shadow: none; }

/* text link with arrow */
.tlink {
  font-size: 15px;
  color: var(--accent-deep);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, gap .2s ease;
}
.tlink:hover { border-bottom-color: var(--accent); gap: 11px; }

/* ---------- section spacing ---------- */
.band { padding-block: clamp(72px, 11vw, 132px); }
.band + .band { border-top: 1px solid var(--line-soft); }
.band.alt { background: var(--bg-2); }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* ============================================================
   HERO
   ============================================================ */
.hero { padding-top: clamp(56px, 9vw, 104px); padding-bottom: clamp(64px, 10vw, 120px); }

.hero-eyebrow { margin-bottom: 26px; }

.hero-title {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.06;
  margin: 0;
  color: var(--ink);
  font-size: clamp(40px, 7.2vw, 82px);
  text-wrap: balance;
}
.hero-title .accent { color: var(--accent); }
.hero-title em {
  font-style: italic;
  font-family: var(--font-serif);
}
.hero-lead {
  font-size: clamp(17px, 1.7vw, 20px);
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 28px 0 0;
  line-height: 1.74;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
  align-items: center;
}
/* split variant */
.v-split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
@media (max-width: 860px) { .v-split { grid-template-columns: 1fr; } }
.v-split .hero-title { font-size: clamp(38px, 5.4vw, 64px); }

/* status card (split hero right) */
.status-card {
  border: 1px solid var(--line);
  background: var(--bg-card);
  border-radius: 18px;
  padding: 26px;
  box-shadow: 0 1px 0 var(--line-soft), 0 24px 48px -36px oklch(0.235 0.012 64 / 0.5);
}
.status-card .live {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent-deep);
}
.status-card .live .pulse {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-wash);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 oklch(0.520 0.078 142 / 0.42); }
  70% { box-shadow: 0 0 0 12px oklch(0.520 0.078 142 / 0); }
  100% { box-shadow: 0 0 0 0 oklch(0.520 0.078 142 / 0); }
}
.status-row {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; padding: 14px 0; border-bottom: 1px dashed var(--line);
}
.status-row:last-child { border-bottom: 0; padding-bottom: 0; }
.status-row .k { font-size: 14px; color: var(--ink-soft); }
.status-row .v { font-family: var(--font-mono); font-size: 13px; color: var(--ink); text-align: right; }

/* ============================================================
   ABOUT — timeline
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(36px, 6vw, 88px);
}
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; gap: 40px; } }
.about-lead {
  font-family: var(--font-display);
  font-size: clamp(21px, 2.4vw, 27px);
  line-height: 1.5;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin: 0;
}
.about-lead .accent { color: var(--accent); }
.about-note { color: var(--ink-soft); margin-top: 22px; font-size: 16px; }

/* ============================================================
   ABOUT — axes + history
   ============================================================ */
.about-axes {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px;
}
.axis {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--accent-deep); background: var(--accent-wash);
  border: 1px solid oklch(0.520 0.078 142 / 0.3);
  padding: 6px 14px; border-radius: 999px;
}

.history-list { margin: 0; padding: 0; list-style: none; }
.history-item {
  display: flex; gap: 16px; padding: 18px 0;
  border-bottom: 1px solid var(--line-soft); align-items: flex-start;
}
.history-item:last-child { border-bottom: 0; }
.history-tag {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em;
  color: var(--accent-deep); background: var(--accent-wash);
  border: 1px solid oklch(0.520 0.078 142 / 0.3);
  padding: 4px 10px; border-radius: 999px; white-space: nowrap;
  flex-shrink: 0; margin-top: 1px;
}
.history-text { font-size: 15px; color: var(--ink-soft); line-height: 1.66; }
.history-text strong { color: var(--ink); font-weight: 500; }

/* ============================================================
   PROJECTS — cards
   ============================================================ */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 900px) { .proj-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .proj-grid { grid-template-columns: 1fr; } }

.card {
  position: relative;
  display: flex; flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  transition: transform .28s cubic-bezier(.2,.7,.2,1), box-shadow .28s ease, border-color .28s ease;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-4px);
  border-color: oklch(0.82 0.02 70);
  box-shadow: 0 26px 52px -34px oklch(0.235 0.012 64 / 0.55);
}
.card-top {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  margin-bottom: 18px;
}
.card-badge {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--ink-faint);
}
.card-badge.live { color: var(--accent-deep); border-color: var(--accent); background: var(--accent-wash); }
.card-badge.wip  { color: oklch(0.5 0.1 250); border-color: oklch(0.7 0.08 250); background: oklch(0.7 0.08 250 / 0.1); }
.card-glyph {
  font-family: var(--font-mono); font-size: 13px; color: var(--ink-faint);
}
.card-name {
  font-family: var(--font-display); font-size: 23px; font-weight: 500;
  letter-spacing: -0.01em; color: var(--ink); margin: 0;
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
}
.card-name .latin { font-family: var(--font-mono); font-size: 13px; color: var(--ink-faint); letter-spacing: 0.02em; }
.card-problem {
  font-size: 15px; color: var(--ink-soft); margin: 14px 0 0; line-height: 1.66;
}
.card-meta {
  margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line);
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.card-status { font-size: 13.5px; color: var(--ink); }
.card-status b { font-weight: 600; }
.card .tlink { margin-top: 18px; }

/* primary / featured card */
.card-featured {
  border-color: oklch(0.520 0.078 142 / 0.45);
  background: oklch(0.520 0.078 142 / 0.03);
}
.card-featured::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  border-radius: 18px 18px 0 0;
}
.card-featured:hover { border-color: oklch(0.520 0.078 142 / 0.7); }

/* ============================================================
   PROOF — achievement strip
   ============================================================ */
.proof-band { padding-block: clamp(36px, 5vw, 56px); }
.proof-chips {
  display: flex; flex-wrap: wrap; gap: 14px; justify-content: center;
}
.proof-chip {
  display: flex; align-items: center; gap: 16px;
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: 16px; padding: 16px 22px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.proof-chip:hover {
  border-color: oklch(0.82 0.02 70);
  box-shadow: 0 8px 24px -12px oklch(0.235 0.012 64 / 0.3);
}
.proof-rank {
  font-family: var(--font-display); font-size: 28px; font-weight: 500;
  color: var(--accent); line-height: 1; letter-spacing: -0.02em;
}
.proof-label { font-size: 13px; color: var(--ink-soft); line-height: 1.4; }
.proof-app { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); margin-top: 2px; }

/* ============================================================
   WRITING — 創業崩潰日記
   ============================================================ */
.writing-grid {
  display: grid; grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(36px, 6vw, 80px); align-items: start;
}
@media (max-width: 860px) { .writing-grid { grid-template-columns: 1fr; gap: 36px; } }

.diary-callout {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.3vw, 26px);
  line-height: 1.5; color: var(--ink); margin: 18px 0 0;
}
.diary-quote {
  border-left: 2px solid var(--accent);
  padding-left: 18px; margin: 24px 0 0;
  color: var(--ink-soft); font-size: 16px; font-style: italic;
  font-family: var(--font-serif);
}

/* ============================================================
   WRITING — topic list
   ============================================================ */
.writing-topics-label {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-faint); margin: 0 0 4px;
}
.topic-list { display: flex; flex-direction: column; }
.topic-item {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 0; border-bottom: 1px solid var(--line);
  font-size: 15px; color: var(--ink-soft); line-height: 1.55;
  transition: padding-left .25s ease, color .2s ease;
}
.topic-item:first-child { border-top: 1px solid var(--line); }
.topic-item:hover { padding-left: 8px; color: var(--ink); }
.topic-chip {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--accent-deep);
  border: 1px solid var(--accent); border-radius: 999px; padding: 3px 10px;
  white-space: nowrap; flex-shrink: 0; margin-top: 1px;
}


/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px); align-items: start;
}
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; gap: 36px; } }
.contact-title {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(30px, 4.4vw, 48px); line-height: 1.1;
  letter-spacing: -0.015em; margin: 16px 0 0; color: var(--ink);
}
.contact-sub { color: var(--ink-soft); margin: 18px 0 0; max-width: 44ch; }
.email-big {
  display: inline-flex; align-items: center; gap: 12px; margin-top: 26px;
  font-family: var(--font-display); font-size: clamp(20px, 2.6vw, 28px);
  color: var(--ink); border-bottom: 2px solid var(--line);
  padding-bottom: 6px; transition: border-color .2s ease, color .2s ease;
}
.email-big:hover { border-bottom-color: var(--accent); color: var(--accent-deep); }

.channels { display: flex; flex-direction: column; gap: 0; }
.channel {
  display: flex; align-items: center; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--line);
  transition: padding-left .25s ease;
}
.channel:first-child { border-top: 1px solid var(--line); }
.channel:hover { padding-left: 10px; }
.channel .ic {
  width: 34px; height: 34px; border-radius: 9px;
  border: 1px solid var(--line); display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft);
  flex-shrink: 0; transition: all .2s ease;
}
.channel:hover .ic { border-color: var(--accent); color: var(--accent-deep); background: var(--accent-wash); }
.channel .c-name { font-size: 15px; font-weight: 500; color: var(--ink); }
.channel .c-handle { font-family: var(--font-mono); font-size: 13px; color: var(--ink-faint); margin-left: auto; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--line);
  padding-block: 40px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint);
}
.footer .top-link { cursor: pointer; transition: color .2s ease; }
.footer .top-link:hover { color: var(--accent-deep); }