/* ============================================================
   HTMlore — editorial / magazine landing page
   ============================================================ */

:root {
  --ink:        #16201c;
  --ink-soft:   #3c463f;
  --ink-faint:  #6c756d;
  --paper:      #f4f1ea;
  --paper-2:    #ece7dc;
  --card:       #fbf9f4;
  --line:       #d8d2c5;
  --accent:     #2f7f68;
  --accent-ink: #1f5a49;
  --rust:       #b8553a;
  --shadow:     0 24px 60px -32px rgba(22, 32, 28, 0.45);

  --serif: "Fraunces", "Noto Serif SC", "Noto Serif JP", Georgia, "Times New Roman", serif;
  --sans:  "Inter", "Noto Serif SC", "Noto Serif JP", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --maxw: 1180px;
}

[data-theme="dark"] {
  --ink:        #ece7da;
  --ink-soft:   #c3bdae;
  --ink-faint:  #8d9088;
  --paper:      #14191a;
  --paper-2:    #0f1314;
  --card:       #1b2122;
  --line:       #2c3334;
  --accent:     #5bbfa2;
  --accent-ink: #84d6bd;
  --rust:       #d98263;
  --shadow:     0 24px 60px -30px rgba(0, 0, 0, 0.7);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  scroll-padding-top: 70px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background .35s ease, color .35s ease;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* lang-specific display family */
html[lang="zh"] .cover-title,
html[lang="zh"] .chapter-title,
html[lang="ja"] .cover-title,
html[lang="ja"] .chapter-title { letter-spacing: -0.01em; }

/* ---------------- masthead ---------------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
.masthead-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 22px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { width: 26px; height: 26px; border-radius: 7px; }
.brand-name {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 21px;
  letter-spacing: -0.02em;
}
.brand-name em { font-style: italic; font-weight: 600; color: var(--accent); }

.main-nav {
  display: flex;
  gap: 22px;
  margin-left: 14px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}
.main-nav a { padding: 6px 0; border-bottom: 1px solid transparent; transition: color .2s, border-color .2s; }
.main-nav a:hover { color: var(--ink); border-color: var(--accent); }

.masthead-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

.language-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.language-switch button {
  border: 0;
  background: transparent;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 11px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.language-switch button:hover { color: var(--ink); }
.language-switch button.active { background: var(--accent); color: #fff; }
[data-theme="dark"] .language-switch button.active { color: #08110d; }

.theme-toggle {
  width: 34px; height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  color: var(--ink);
  transition: background .2s, transform .3s;
}
.theme-toggle:hover { background: var(--paper-2); transform: rotate(18deg); }
.theme-toggle::before { content: "☾"; }
[data-theme="dark"] .theme-toggle::before { content: "☀"; }

.ink-link {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: background .2s, color .2s, border-color .2s;
}
.ink-link:hover { border-color: var(--ink); }
.ink-link.solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.ink-link.solid:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------------- layout helpers ---------------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.rule { display: none; }

/* ---- full-page magazine scroll: each section is one "page" ---- */
.cover, .chapter, .features {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  scroll-snap-align: start;
  scroll-margin-top: 70px;
}
.deploy {
  min-height: 100vh;
  align-content: center;
  scroll-snap-align: start;
  scroll-margin-top: 70px;
}

/* ---- floating "scroll down" button (semi-transparent, auto-hides) ---- */
.scroll-next {
  position: fixed;
  right: 28px;
  bottom: 26px;
  z-index: 40;
  width: 48px;
  height: 48px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 60%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  color: var(--ink);
  cursor: pointer;
  display: grid;
  place-items: center;
  opacity: 0.34;
  transition: opacity .3s ease, background .3s ease;
}
.scroll-next svg {
  width: 20px;
  height: 20px;
  animation: hv-bob 2.4s ease-in-out infinite;
}
.scroll-next:hover { opacity: 1; }
.scroll-next:hover svg { animation-play-state: paused; }
.scroll-next.dim { opacity: 0.12; }
.scroll-next.is-hidden { opacity: 0; pointer-events: none; }
@keyframes hv-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(5px); }
}
@media (prefers-reduced-motion: reduce) {
  .scroll-next svg { animation: none; }
}

/* ---------------- cover ---------------- */
.cover { padding: 72px 0 64px; }
.cover-meta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.cover-meta .dot { color: var(--accent); }
.cover-kicker {
  margin: 26px 0 10px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--accent-ink);
  text-transform: uppercase;
}
.cover-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(48px, 9vw, 118px);
  line-height: 0.94;
  letter-spacing: -0.035em;
}
.cover-title .line { display: block; }
.cover-title .accent { color: var(--accent); font-style: italic; font-weight: 600; }
.cover-lede {
  margin: 30px 0 0;
  max-width: 64ch;
  font-size: 20px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.cover-actions { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn-primary {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 14px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: 4px;
  transition: transform .15s, background .2s;
}
.btn-primary:hover { background: var(--accent-ink); transform: translateY(-2px); }
[data-theme="dark"] .btn-primary { color: #08110d; }
.btn-ghost {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  transition: background .2s, color .2s;
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.cover-index {
  list-style: none;
  margin: 56px 0 0;
  padding: 24px 0 0;
  border-top: 2px solid var(--ink);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}
.cover-index li {
  padding: 0 26px;
  border-left: 1px solid var(--line);
}
.cover-index li:first-child { padding-left: 0; border-left: 0; }
.idx-no {
  display: block;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 34px;
  color: var(--accent);
  line-height: 1;
}
.idx-name { display: block; margin-top: 10px; font-weight: 600; font-size: 17px; }
.idx-desc { display: block; margin-top: 4px; font-size: 14px; color: var(--ink-faint); }

/* ---------------- chapter ---------------- */
.chapter { padding: 78px 0; }
.chapter-head { display: flex; gap: 26px; align-items: flex-start; }
.chapter-no {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(56px, 10vw, 104px);
  line-height: 0.8;
  color: var(--accent);
  flex: none;
  -webkit-text-stroke: 1px var(--accent);
  -webkit-text-fill-color: transparent;
}
.chapter-eyebrow {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.chapter-title {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.chapter-body {
  margin-top: 44px;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 52px;
}
.chapter-lead p { margin: 0; font-size: 19px; line-height: 1.7; color: var(--ink-soft); }
.dropcap::first-letter {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 4.4em;
  line-height: 0.72;
  float: left;
  margin: 6px 12px 0 0;
  color: var(--accent);
}
.chapter-aside {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.chapter-aside p { margin: 0 0 18px; font-size: 15px; line-height: 1.6; color: var(--ink-soft); }
.chapter-aside p:last-child { margin-bottom: 0; }
.chapter-aside strong { color: var(--ink); font-weight: 600; }

/* dark chapter (flywheel) — always a dark page, so scope light tokens
   locally instead of using theme vars that flip in dark mode. */
.dark-chapter {
  --paper: #f4f1ea;
  --paper-2: #e7e1d4;
  --ink: #14191a;
  --ink-soft: #cfc9ba;
  --ink-faint: #8f9389;
  --line: rgba(244, 241, 234, 0.16);
  width: 100vw;
  margin-left: calc(50% - 50vw);
  background: #14191a;
  color: var(--paper);
  border-radius: 0;
  padding: 96px max(28px, calc(50vw - var(--maxw) / 2));
}
[data-theme="dark"] .dark-chapter { background: #0b0f10; }
.dark-chapter .chapter-eyebrow { color: color-mix(in srgb, var(--paper) 60%, transparent); }
.dark-chapter .chapter-no { color: var(--accent); -webkit-text-stroke-color: var(--accent); }
.dark-chapter .chapter-title { color: var(--paper); }
.dark-chapter .chapter-lead p,
.dark-chapter .chapter-aside p { color: color-mix(in srgb, var(--paper) 80%, transparent); }
.dark-chapter .chapter-aside { border-color: color-mix(in srgb, var(--paper) 18%, transparent); }
.dark-chapter .chapter-aside strong { color: var(--paper); }
.dark-chapter .dropcap::first-letter { color: var(--accent); }

/* ---------------- spread / app window ---------------- */
.spread { margin: 52px 0 0; }
.spread-window {
  display: grid;
  grid-template-columns: 230px 1fr;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  min-height: 360px;
}
.sw-side { background: var(--paper-2); border-right: 1px solid var(--line); padding: 18px 16px; }
.sw-logo { display: flex; align-items: center; gap: 8px; font-family: var(--serif); font-weight: 900; font-size: 15px; }
.sw-logo img { width: 20px; height: 20px; border-radius: 6px; }
.sw-group { margin-top: 22px; }
.sw-grouptitle { font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 8px; }
.sw-nav { display: flex; justify-content: space-between; align-items: center; padding: 7px 10px; border-radius: 6px; font-size: 13px; color: var(--ink-soft); }
.sw-nav b { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); font-weight: 600; }
.sw-nav.active { background: var(--accent); color: #fff; }
.sw-nav.active b { color: rgba(255,255,255,.8); }
[data-theme="dark"] .sw-nav.active { color: #08110d; }
.sw-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.sw-chips span { font-size: 11px; padding: 3px 9px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-faint); }

.sw-main { padding: 18px 20px; }
.sw-bar { display: flex; gap: 12px; align-items: center; margin-bottom: 18px; }
.sw-search { flex: 1; padding: 9px 14px; border: 1px solid var(--line); border-radius: 8px; font-size: 13px; color: var(--ink-faint); background: var(--paper); }
.sw-ai { font-family: var(--mono); font-size: 12px; padding: 9px 14px; border-radius: 8px; background: var(--ink); color: var(--paper); }
.sw-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.sw-cards article { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.sw-tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-ink); }
.sw-cards h4 { margin: 8px 0 6px; font-family: var(--serif); font-weight: 600; font-size: 17px; line-height: 1.2; }
.sw-cards p { margin: 0; font-size: 13px; color: var(--ink-faint); line-height: 1.5; }

figcaption {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  text-align: center;
}

/* ---------------- flywheel: readable four-step cycle ---------------- */
.flywheel { margin: 40px auto 0; max-width: 1000px; width: 100%; }
.fw-track { display: flex; align-items: stretch; justify-content: center; gap: 0; }
.fw-step {
  flex: 1 1 0;
  min-width: 0;
  max-width: 230px;
  padding: 28px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(244, 241, 234, 0.045);
}
.fw-step-no {
  display: block;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 44px;
  line-height: 1;
  color: var(--accent);
}
.fw-step-title {
  margin: 16px 0 9px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 23px;
  color: var(--paper);
}
.fw-step-desc { margin: 0; font-size: 14px; line-height: 1.6; color: var(--ink-soft); }
.fw-link { display: flex; align-items: center; padding: 0 12px; flex: 0 0 auto; color: var(--accent); }
.fw-link svg { width: 28px; height: 28px; }

.fw-return { position: relative; margin-top: 22px; }
.fw-return-svg { display: block; width: 100%; height: 56px; color: color-mix(in srgb, var(--paper) 42%, transparent); }
.fw-return-label {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: #14191a;
  padding: 7px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: color-mix(in srgb, var(--paper) 82%, transparent);
  white-space: nowrap;
}
[data-theme="dark"] .fw-return-label { background: #0b0f10; }

@media (max-width: 760px) {
  .fw-track { flex-direction: column; align-items: center; }
  .fw-step { max-width: 360px; width: 100%; }
  .fw-link { transform: rotate(90deg); padding: 10px 0; }
  .fw-return-label { white-space: normal; text-align: center; max-width: 86%; }
}

/* ---------------- publish cards ---------------- */
.publish-cards {
  margin-top: 50px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.pcard { padding: 28px 24px; border-left: 1px solid var(--line); }
.pcard:first-child { border-left: 0; }
.pc-no { font-family: var(--serif); font-weight: 900; font-size: 30px; color: var(--accent); }
.pcard h4 { margin: 14px 0 8px; font-family: var(--serif); font-weight: 600; font-size: 19px; }
.pcard p { margin: 0; font-size: 14px; color: var(--ink-faint); line-height: 1.55; }

/* ---------------- features ---------------- */
.features { padding: 78px 0; }
.features-head { max-width: 30ch; }
.feat-grid {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.feat-grid article { background: var(--paper); padding: 30px 26px; }
.feat-no { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--accent); }
.feat-grid h3 { margin: 14px 0 8px; font-family: var(--serif); font-weight: 600; font-size: 21px; }
.feat-grid p { margin: 0; font-size: 14px; color: var(--ink-faint); line-height: 1.6; }

/* ---------------- deploy ---------------- */
.deploy { padding: 78px 0; display: grid; grid-template-columns: 1fr 1.05fr; gap: 52px; align-items: center; }
.deploy-text { margin: 18px 0 0; font-size: 18px; color: var(--ink-soft); max-width: 46ch; }
.deploy-actions { margin-top: 26px; display: flex; gap: 14px; flex-wrap: wrap; }
.deploy-terminal {
  background: #0d1311;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid #1d2825;
}
.term-bar { display: flex; gap: 8px; padding: 14px 16px; background: #121a17; }
.term-bar span { width: 11px; height: 11px; border-radius: 999px; background: #2c3a35; }
.term-bar span:first-child { background: var(--rust); }
.term-bar span:nth-child(2) { background: #c9a227; }
.term-bar span:nth-child(3) { background: var(--accent); }
.deploy-terminal pre { margin: 0; padding: 22px 22px 26px; overflow-x: auto; }
.deploy-terminal code { font-family: var(--mono); font-size: 13.5px; line-height: 1.9; color: #d6e3de; }
.term-comment { color: #5f7a72; }

/* ---------------- colophon ---------------- */
.colophon { border-top: 2px solid var(--ink); margin-top: 12px; }
.colophon-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 28px;
  display: flex;
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
}
.colo-brand .brand-name { font-size: 24px; }
.colo-brand p { margin: 6px 0 0; font-size: 14px; color: var(--ink-faint); }
.colo-meta { display: flex; flex-direction: column; gap: 4px; font-family: var(--mono); font-size: 12px; color: var(--ink-faint); margin-left: auto; }
.colo-links { display: flex; gap: 18px; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
.colo-links a { padding-bottom: 2px; border-bottom: 1px solid var(--accent); }

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .main-nav { display: none; }
  .chapter-body { grid-template-columns: 1fr; gap: 32px; }
  .deploy { grid-template-columns: 1fr; }
  .publish-cards { grid-template-columns: 1fr 1fr; }
  .pcard:nth-child(3) { border-left: 0; }
  .feat-grid { grid-template-columns: 1fr 1fr; }
  .dark-chapter { padding: 48px 26px; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .masthead-inner { padding: 12px 18px; flex-wrap: wrap; }
  main { padding: 0 18px; }
  .cover-index { grid-template-columns: 1fr; gap: 18px; }
  .cover-index li { padding: 16px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .cover-index li:first-child { padding-top: 16px; border-top: 1px solid var(--line); }
  .chapter-head { gap: 14px; }
  .sw-cards, .publish-cards, .feat-grid { grid-template-columns: 1fr; }
  .pcard, .feat-grid article { border-left: 0; }
  .spread-window { grid-template-columns: 1fr; }
  .sw-side { display: none; }
  .scroll-next {
    right: 18px;
    bottom: 18px;
    width: 42px;
    height: 42px;
    opacity: 0.42;
  }
}