/* ============================================================
   CourseForge — "The Forge"
   cool ink structure, one ember spark
   ============================================================ */

:root {
  --ink:      #0d1014;
  --ink-2:    #14181f;
  --ink-3:    #1c222c;
  --line:     #232a35;
  --chalk:    #ece9e2;
  --slate:    #8b93a3;
  --slate-2:  #5a6273;
  --ember:    #ff5c26;
  --ember-2:  #ff8a54;
  --paper:    #f4f0e8;
  --paper-ink:#191512;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --maxw: 1120px;
  --pad: clamp(20px, 5vw, 64px);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; line-height: 1.05; margin: 0; }
p { margin: 0; }
em { font-style: normal; color: var(--chalk); box-shadow: inset 0 -0.5em 0 rgba(255, 92, 38, .14); }
strong { color: var(--chalk); font-weight: 600; }

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

.accent { color: var(--ember); }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--ember); color: #1a0e07; padding: 10px 16px; border-radius: 8px;
}
.skip:focus { left: 12px; top: 12px; }

/* ---- shared bits ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--ember); margin-bottom: 22px;
}
.eyebrow.center { text-align: center; }
.section-title { font-size: clamp(28px, 4.2vw, 44px); }
.section-title.center { text-align: center; max-width: 20ch; margin-inline: auto; }
.mono { font-family: var(--font-mono); }

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: 16px;
  padding: 14px 24px; border-radius: 999px; cursor: pointer; border: 1px solid transparent;
  transition: transform .18s var(--ease), background .2s var(--ease), border-color .2s var(--ease), color .2s;
}
.btn:focus-visible { outline: 2px solid var(--ember-2); outline-offset: 3px; }
.btn-primary { background: var(--ember); color: #1a0d06; box-shadow: 0 8px 30px rgba(255, 92, 38, .28); }
.btn-primary:hover { transform: translateY(-2px); background: var(--ember-2); }
.btn-lg { font-size: 18px; padding: 17px 34px; }
.btn-ghost { border-color: var(--line); color: var(--chalk); padding: 11px 20px; }
.btn-ghost:hover { border-color: var(--slate); }
.btn-text { color: var(--chalk); padding: 14px 6px; }
.btn-text:hover { color: var(--ember); }

/* ---- nav ---- */
.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--pad);
  background: rgba(13, 16, 20, .72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.wordmark {
  display: inline-flex; align-items: center; gap: 11px;
  font-family: var(--font-display); font-weight: 700; font-size: 19px; letter-spacing: -0.01em;
}
.wordmark .mark {
  width: 13px; height: 13px; border-radius: 3px;
  background: var(--ember);
  box-shadow: 0 0 0 3px rgba(255, 92, 38, .18), 0 0 16px 2px rgba(255, 92, 38, .5);
  transform: rotate(45deg);
}
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 15px; }
.nav-links a:not(.btn) { color: var(--slate); transition: color .2s; }
.nav-links a:not(.btn):hover { color: var(--chalk); }

/* ---- hero ---- */
.hero {
  position: relative;
  min-height: min(92vh, 860px);
  display: flex; align-items: center;
  padding: clamp(60px, 10vh, 120px) var(--pad) 80px;
  overflow: hidden;
}
.hero-graph {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 0;
  -webkit-mask-image: radial-gradient(120% 90% at 72% 42%, #000 42%, transparent 82%);
  mask-image: radial-gradient(120% 90% at 72% 42%, #000 42%, transparent 82%);
}
.hero-inner { position: relative; z-index: 1; max-width: 680px; width: 100%; margin: 0 auto 0 max(0px, calc((100vw - var(--maxw)) / 2)); }
.hero-title { font-size: clamp(38px, 6.4vw, 74px); font-weight: 700; }
.hero-sub {
  margin-top: 26px; max-width: 52ch; font-size: clamp(17px, 2.1vw, 20px);
  color: var(--slate); line-height: 1.62;
}
.hero-sub em { color: var(--chalk); box-shadow: none; font-style: italic; }
.hero-cta { display: flex; align-items: center; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.hero-note {
  margin-top: 40px; font-family: var(--font-mono); font-size: 13px; color: var(--slate-2);
  display: flex; align-items: center; gap: 10px; max-width: 46ch;
}
.node-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ember); box-shadow: 0 0 10px 1px var(--ember); flex: none; }

/* ---- thesis ---- */
.thesis {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(70px, 12vh, 150px) var(--pad);
  display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(30px, 6vw, 90px); align-items: end;
  border-top: 1px solid var(--line);
}
.thesis-lead { font-family: var(--font-display); font-weight: 600; font-size: clamp(30px, 4.6vw, 52px); line-height: 1.08; letter-spacing: -0.02em; }
.thesis-body { color: var(--slate); font-size: 18px; max-width: 44ch; }

/* ---- how ---- */
.how { max-width: var(--maxw); margin: 0 auto; padding: clamp(50px, 8vh, 90px) var(--pad) clamp(70px, 12vh, 130px); }
.how .section-title { margin-bottom: 60px; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(24px, 3vw, 44px); counter-reset: none; }
.step { border-top: 2px solid var(--line); padding-top: 24px; position: relative; }
.step-no { font-family: var(--font-mono); font-size: 13px; color: var(--ember); letter-spacing: 0.1em; }
.step h3 { font-size: 22px; margin: 16px 0 12px; }
.step p { color: var(--slate); font-size: 15.5px; }

/* ---- inside (paper) ---- */
.inside { background: var(--paper); color: var(--paper-ink); padding: clamp(70px, 12vh, 130px) var(--pad); }
.inside .eyebrow { color: #b3401c; }
.inside-head { max-width: var(--maxw); margin: 0 auto; }
.inside .section-title { color: var(--paper-ink); max-width: 22ch; }
.inside-sub { margin-top: 22px; color: #6b6258; font-size: 18px; max-width: 52ch; }
.map { max-width: var(--maxw); margin: 54px auto 0; display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 72px); }
.map-label { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.14em; text-transform: uppercase; color: #8a8073; margin-bottom: 18px; }
.map-label.hot { color: #b3401c; }
.modules { list-style: none; margin: 0; padding: 0; }
.modules li { display: flex; align-items: baseline; gap: 14px; padding: 13px 0; border-bottom: 1px solid #e2dccf; font-size: 18px; font-family: var(--font-display); font-weight: 500; }
.modules li .m-no { font-family: var(--font-mono); font-weight: 400; font-size: 13px; color: #a99f8f; }
.modules li.hot { color: #16100c; }
.modules li.hot .m-no { color: var(--ember); }
.map-aside { margin-top: 30px; padding: 22px; background: #ece5d7; border-radius: 12px; }
.map-aside .mono { color: #b3401c; font-size: 12.5px; margin-bottom: 8px; }
.map-aside p:last-child { color: #524a40; font-size: 15px; }

/* ---- wink ---- */
.wink { max-width: var(--maxw); margin: 0 auto; padding: clamp(70px, 12vh, 130px) var(--pad); }
.wink-card {
  border: 1px solid var(--line); border-radius: 16px; background: linear-gradient(180deg, var(--ink-2), var(--ink));
  padding: clamp(30px, 5vw, 56px);
  position: relative; overflow: hidden;
}
.wink-card::before {
  content: ""; position: absolute; top: -40%; right: -10%; width: 340px; height: 340px;
  background: radial-gradient(circle, rgba(255, 92, 38, .16), transparent 68%); pointer-events: none;
}
.wink-tag { color: var(--slate-2); font-size: 13px; margin-bottom: 20px; }
.wink-line { font-family: var(--font-display); font-weight: 500; font-size: clamp(22px, 3.2vw, 34px); line-height: 1.28; letter-spacing: -0.01em; max-width: 30ch; }

/* ---- get ---- */
.get { border-top: 1px solid var(--line); }
.get-inner { max-width: 760px; margin: 0 auto; padding: clamp(70px, 12vh, 130px) var(--pad); text-align: center; }
.get .section-title { margin-bottom: 40px; }
.includes { list-style: none; margin: 0 auto 44px; padding: 0; max-width: 500px; text-align: left; display: grid; gap: 2px; }
.includes li { position: relative; padding: 12px 0 12px 32px; border-bottom: 1px solid var(--line); color: var(--chalk); font-size: 16px; }
.includes li::before { content: "＋"; position: absolute; left: 0; color: var(--ember); font-family: var(--font-mono); }
.get-cta { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.get-price { color: var(--slate); font-size: 14px; letter-spacing: 0.04em; }
.get-price .was { text-decoration: line-through; color: var(--slate-2); margin-right: 10px; }
.get-price .now { color: var(--chalk); font-weight: 500; font-size: 16px; margin-right: 8px; }
.guarantee { margin-top: 40px; color: var(--slate-2); font-size: 14.5px; max-width: 48ch; margin-inline: auto; }
.guarantee a { color: var(--slate); text-decoration: underline; }
.guarantee a:hover { color: var(--ember); }

/* ---- footer ---- */
.foot {
  max-width: var(--maxw); margin: 0 auto;
  padding: 40px var(--pad) 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  border-top: 1px solid var(--line);
}
.wordmark.small { font-size: 15px; color: var(--slate); }
.wordmark.small .mark { width: 10px; height: 10px; }
.foot-links { display: flex; gap: 22px; flex-wrap: wrap; font-size: 14px; }
.foot-links a { color: var(--slate); transition: color .2s; }
.foot-links a:hover { color: var(--ember); }
.foot-note { color: var(--slate-2); font-size: 13px; }

/* ---- toast ---- */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px);
  background: var(--ink-2); border: 1px solid var(--line); color: var(--chalk);
  padding: 14px 22px; border-radius: 999px; font-size: 14.5px; z-index: 60;
  opacity: 0; transition: opacity .25s, transform .25s var(--ease);
  box-shadow: 0 12px 40px rgba(0,0,0,.5);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- scroll reveal ---- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 860px) {
  .thesis { grid-template-columns: 1fr; align-items: start; gap: 24px; }
  .steps { grid-template-columns: 1fr; gap: 8px; }
  .step { border-top: none; border-left: 2px solid var(--line); padding: 4px 0 4px 20px; }
  .map { grid-template-columns: 1fr; }
  .hero-graph { -webkit-mask-image: radial-gradient(140% 80% at 50% 30%, #000 40%, transparent 88%); mask-image: radial-gradient(140% 80% at 50% 30%, #000 40%, transparent 88%); opacity: .5; }
  .hero-inner { margin-inline: 0; }
}
@media (max-width: 560px) {
  .nav-links a:not(.btn):first-child { display: none; }
  .foot { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---- legal pages ---- */
.legal { max-width: 760px; margin: 0 auto; padding: clamp(50px, 9vh, 96px) var(--pad) clamp(60px, 10vh, 110px); }
.legal .eyebrow { margin-bottom: 14px; }
.legal h1 { font-size: clamp(30px, 5vw, 46px); margin-bottom: 12px; }
.legal .updated { font-family: var(--font-mono); font-size: 13px; color: var(--slate-2); margin-bottom: 40px; }
.legal h2 { font-family: var(--font-display); font-size: 20px; margin: 34px 0 12px; }
.legal p, .legal li { color: var(--slate); font-size: 16px; line-height: 1.7; }
.legal p { margin-bottom: 14px; }
.legal ul { margin: 0 0 14px; padding-left: 22px; }
.legal li { margin-bottom: 8px; }
.legal a { color: var(--chalk); text-decoration: underline; }
.legal a:hover { color: var(--ember); }
.legal strong { color: var(--chalk); }
.legal .back { font-family: var(--font-mono); font-size: 13px; color: var(--ember); }