@font-face {
  font-family: "Alliance No.2";
  src: url("../fonts/AllianceNo2-Light.otf") format("opentype");
  font-weight: 300;
  font-display: swap;
}

@font-face {
  font-family: "Alliance No.2";
  src: url("../fonts/AllianceNo2-Regular.otf") format("opentype");
  font-weight: 400;
  font-display: swap;
}

:root {
  --paper: #fff;
  --navy: #1d2142;
  --ink: #26283a;
  --body: #4f5265;
  --muted: #8d8fa0;
  --line: #e4e4ea;
  --wash: #f4f4f7;
  --red: #e10600;
  --blue: #0a3cff;

  --expo-out: cubic-bezier(0.16, 1, 0.3, 1);
  --measure: 66ch;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 96px; }

body {
  background: var(--paper);
  color: var(--body);
  font-family: "Alliance No.2", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--red); color: #fff; }

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
ol, ul { list-style: none; }

/* reading progress */
.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 50;
  pointer-events: none;
}
.progress span {
  display: block;
  height: 100%;
  background: var(--red);
  transform: scaleX(var(--p, 0));
  transform-origin: 0 50%;
}

/* a faint light at the top, so the white isn't flat */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 40% at 90% 0%, rgba(10, 60, 255, 0.05), transparent 70%),
    radial-gradient(40% 30% at 0% 10%, rgba(225, 6, 0, 0.04), transparent 70%);
}

.page {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: clamp(20px, 2.6vw, 40px) clamp(20px, 5vw, 80px) clamp(40px, 5vw, 80px);
}

/* ---------- Top bar ---------- */

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: inline-flex;
  align-items: baseline;
  font-size: clamp(22px, 1.55vw, 30px);
  letter-spacing: -0.01em;
  line-height: 1;
  color: var(--ink);
}

.logo__cursor {
  display: inline-block;
  width: 0.42em;
  height: 0.1em;
  margin-left: 0.12em;
  background: var(--red);
  transform: translateY(0.06em);
  animation: breathe 2.4s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.15; }
}

/* glass pill, after the itsur header button, in daylight */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.8em;
  padding: 0.45em 0.6em 0.45em 0.6em;
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 0 #fff, 0 6px 24px rgba(29, 33, 66, 0.08);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  transition: border-color 0.5s var(--expo-out), transform 0.5s var(--expo-out), box-shadow 0.5s var(--expo-out);
}

.pill__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.38em 0.7em;
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  font-size: 11px;
  letter-spacing: 0.08em;
  box-shadow: 0 2px 12px rgba(225, 6, 0, 0.35);
}

.pill__badge::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #fff;
}

.pill__label { white-space: nowrap; }

.pill__chevron {
  width: 7px;
  height: 12px;
  margin-right: 0.6em;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.4s, transform 0.5s var(--expo-out);
}

.pill:hover { border-color: rgba(225, 6, 0, 0.35); transform: translateY(-2px); box-shadow: inset 0 1px 0 #fff, 0 10px 30px rgba(29, 33, 66, 0.12); }
.pill:hover .pill__chevron { stroke: var(--ink); transform: translateX(3px); }

/* ---------- Intro ---------- */

.intro {
  max-width: 1100px;
  padding: clamp(56px, 9vh, 120px) 0 clamp(36px, 4vw, 56px);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.8em;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.8em;
}

.eyebrow__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 10px rgba(225, 6, 0, 0.7);
}

.title {
  font-size: clamp(38px, 5.4vw, 92px);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--navy);
  max-width: 14em;
}

.chapter {
  display: flex;
  align-items: baseline;
  gap: 1.2em;
  margin-top: clamp(24px, 2.6vw, 40px);
  font-size: clamp(17px, 1.3vw, 24px);
  color: var(--ink);
}

.chapter__num {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.62em;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--red);
  white-space: nowrap;
}

.meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: clamp(32px, 3.6vw, 56px);
  padding-top: clamp(20px, 2vw, 28px);
  border-top: 1px solid var(--line);
}

.author { display: flex; align-items: center; gap: 14px; }

.author__avatar {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--red);
  background: rgba(225, 6, 0, 0.08);
  border: 1px solid rgba(225, 6, 0, 0.3);
}

.author__name { display: block; font-size: 15px; color: var(--ink); }
.author__role { display: block; margin-top: 3px; font-size: 13px; color: var(--muted); }

.meta__facts { display: flex; gap: clamp(28px, 3vw, 56px); }
.meta__facts dt {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.meta__facts dd { margin-top: 6px; font-size: 15px; color: var(--ink); }

/* ---------- Cover ---------- */

.cover {
  position: relative;
  margin: 0 0 clamp(56px, 7vw, 120px);
}

.cover img {
  width: 100%;
  aspect-ratio: 21 / 10;
  object-fit: cover;
  object-position: 50% 35%;
  border-radius: clamp(20px, 2.2vw, 36px);
}

/* a glass card hanging off the photo's bottom edge */
.cover__card {
  position: absolute;
  inset-inline-end: clamp(16px, 3vw, 48px);
  bottom: clamp(-28px, -2vw, -20px);
  max-width: min(420px, calc(100% - 32px));
  padding: 18px 22px 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 20px 50px rgba(29, 33, 66, 0.16);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
}

.cover__k {
  display: block;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 8px;
}

.cover__v {
  display: block;
  font-size: clamp(16px, 1.2vw, 20px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--navy);
}

/* ---------- Layout: sticky contents + article ---------- */

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 880px);
  column-gap: clamp(40px, 6vw, 110px);
  justify-content: start;
}

.toc {
  position: sticky;
  top: 40px;
  align-self: start;
  max-height: calc(100vh - 80px);
  overflow: auto;
  padding-top: 6px;
}

.toc__title {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 18px;
}

.toc__part {
  margin: 18px 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc__list a {
  position: relative;
  display: block;
  padding: 6px 0 6px 16px;
  font-size: 14px;
  line-height: 1.3;
  color: var(--muted);
  transition: color 0.4s var(--expo-out);
}

.toc__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--line);
  transition: width 0.6s var(--expo-out), background-color 0.4s;
}

.toc__list a:hover { color: var(--ink); }

.toc__list a.is-active { color: var(--navy); }
.toc__list a.is-active::before { width: 10px; background: var(--red); }

/* ---------- Article ---------- */

.article { min-width: 0; }

.sec { padding-bottom: clamp(44px, 5vw, 80px); }

.sec > p,
.sec > blockquote,
.sec > h2 { max-width: var(--measure); }

.article h2 {
  font-size: clamp(28px, 2.6vw, 44px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--navy);
  margin: 0 0 0.7em;
}

.kicker,
.part {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 1.4em;
}

.part {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
}

.part::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--red);
}

.article p {
  font-size: clamp(16px, 1.15vw, 19px);
  line-height: 1.72;
  color: var(--body);
}

.article p + p { margin-top: 1.3em; }

.article .lead {
  font-size: clamp(19px, 1.5vw, 26px);
  line-height: 1.45;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.article blockquote {
  margin: 2em 0;
  padding-left: 1.2em;
  border-left: 2px solid var(--red);
  font-size: clamp(20px, 1.6vw, 28px);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--navy);
}

/* figures: images from the design, never rebuilt in code; they run the full article width, no frame */
.fig { margin: clamp(28px, 3vw, 44px) 0; }

.fig img { width: 100%; border-radius: clamp(14px, 1.4vw, 22px); }

/* ---------- Devices gallery ---------- */

.devices {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 1.6vw, 26px);
  margin: clamp(32px, 3.6vw, 56px) 0 clamp(12px, 1.4vw, 20px);
}

/* the middle column sits lower: a brick rhythm instead of a flat grid */
.device:nth-child(3n + 2) { transform: translateY(clamp(18px, 2.4vw, 40px)); }

.device__btn {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: #0b0b0e;
  border-radius: clamp(16px, 1.6vw, 26px);
  overflow: hidden;
  cursor: zoom-in;
  -webkit-tap-highlight-color: transparent;
}

.device__btn img { width: 100%; aspect-ratio: 1; object-fit: cover; }

.device__btn:focus-visible { outline: 2px solid var(--red); outline-offset: 4px; }

.device__label {
  display: flex;
  gap: 0.8em;
  margin-top: 10px;
  padding-left: 4px;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.device__label span { color: var(--red); }

/* the gallery's own reveal: each device rises in turn, keeping the brick offset */
.device[data-reveal] { transition-delay: calc(var(--i, 0) * 90ms); }
.device[data-reveal]:not(.is-visible) { transform: translateY(40px); }
.device:nth-child(3n + 2)[data-reveal]:not(.is-visible) { transform: translateY(80px); }

/* ---------- Tier videos ---------- */

.tiers {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 1.4vw, 22px);
  margin: clamp(32px, 3.6vw, 52px) 0 clamp(28px, 3vw, 44px);
}

.tier__screen {
  position: relative;
  aspect-ratio: 9 / 16;
  border-radius: clamp(16px, 1.6vw, 24px);
  overflow: hidden;
  background: #f7f7f5;
  box-shadow: inset 0 0 0 1px var(--line);
}

.tier__video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tier__label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 12px;
  padding-left: 4px;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px !important;
  line-height: 1.5 !important;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted) !important;
}

.tier__label span { color: var(--ink); }

.tier[data-reveal] { transition-delay: calc(var(--i, 0) * 110ms); }

.article strong { font-weight: 400; color: var(--navy); }

.next { display: grid; gap: clamp(12px, 1.4vw, 20px); }
.next__card--prev { background: var(--wash); color: var(--navy); }
.next__card--prev .next__k { color: var(--muted); }
.next__card--prev:hover { box-shadow: 0 24px 60px rgba(29, 33, 66, 0.12); }

@media (max-width: 768px) {
  .tiers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- Zoom (WebGL lightbox) ---------- */

.zoom {
  position: fixed;
  inset: 0;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  cursor: zoom-out;
  transition: opacity 0.3s;
}

.zoom.is-open { opacity: 1; pointer-events: auto; }
.zoom.is-dragging { cursor: grabbing; }

.zoom__gl,
.zoom__fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.zoom__fallback { display: none; object-fit: contain; padding: 5vmin; background: rgba(8, 8, 10, 0.94); }
.zoom.no-gl .zoom__fallback { display: block; }
.zoom.no-gl .zoom__gl { display: none; }

.zoom__close {
  position: absolute;
  top: clamp(16px, 2.4vw, 32px);
  right: clamp(16px, 2.4vw, 32px);
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transition: background-color 0.4s, transform 0.5s var(--expo-out);
}

.zoom__close span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 1.5px;
  background: #fff;
  transform: translate(-50%, -50%) rotate(45deg);
}
.zoom__close span + span { transform: translate(-50%, -50%) rotate(-45deg); }
.zoom__close:hover { background: rgba(255, 255, 255, 0.16); transform: rotate(90deg); }

.zoom__caption {
  position: absolute;
  left: clamp(16px, 2.4vw, 32px);
  bottom: clamp(16px, 2.4vw, 28px);
  display: flex;
  align-items: baseline;
  gap: 1.2em;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  pointer-events: none;
}

.zoom__index { color: var(--red); }
.zoom__name { color: #fff; }

@media (max-width: 768px) {
  .devices { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .device:nth-child(3n + 2) { transform: none; }
  .device:nth-child(even) { transform: translateY(18px); }
  .device:nth-child(3n + 2)[data-reveal]:not(.is-visible) { transform: translateY(40px); }
  .zoom__hint { display: none; }
}

.sec--conclusion {
  margin-top: clamp(8px, 1vw, 16px);
  padding-top: clamp(36px, 4vw, 56px);
  border-top: 1px solid var(--line);
}

/* next chapter */
.next { margin-top: clamp(16px, 2vw, 32px); }

.next__card {
  display: grid;
  gap: 10px;
  padding: clamp(24px, 2.6vw, 40px);
  border-radius: clamp(18px, 1.8vw, 28px);
  background: #09090b;
  color: #fff;
  transition: transform 0.6s var(--expo-out), box-shadow 0.6s var(--expo-out);
}

.next__card:hover { transform: translateY(-3px); box-shadow: 0 24px 60px rgba(9, 9, 11, 0.25); }

.next__k {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.next__v {
  font-size: clamp(22px, 2.2vw, 36px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.next__soon {
  justify-self: start;
  margin-top: 6px;
  padding: 0.4em 0.9em;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- Footer ---------- */

.foot {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: clamp(64px, 8vw, 140px);
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.foot__nav { display: flex; gap: clamp(20px, 3vw, 48px); }
.foot__nav a { transition: color 0.4s; }
.foot__nav a:hover { color: var(--ink); }

/* ---------- Reveals ---------- */

[data-reveal] {
  transition:
    opacity 1.4s var(--expo-out),
    transform 1.4s var(--expo-out),
    filter 1.4s var(--expo-out);
  transition-delay: var(--delay, 0s);
}

[data-reveal]:not(.is-visible) {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(8px);
}

/* the title comes in word by word */
.title[data-reveal]:not(.is-visible) { opacity: 1; transform: none; filter: none; }

.word {
  display: inline-block;
  overflow: hidden;
  vertical-align: top;
  padding-bottom: 0.12em;
  margin-bottom: -0.12em;
}

.word > span {
  display: inline-block;
  transition: transform 1.3s var(--expo-out), opacity 1s var(--expo-out);
  transition-delay: calc(var(--w, 0) * 45ms);
}

.title:not(.is-visible) .word > span {
  transform: translateY(105%) rotate(3deg);
  opacity: 0;
}

.is-loading .intro [data-reveal]:not(.title) { opacity: 0; transform: translateY(28px); filter: blur(8px); }

/* ---------- Responsive ---------- */

@media (max-width: 1100px) {
  .layout { grid-template-columns: minmax(0, 880px); }
  .toc { position: static; max-height: none; margin-bottom: 40px; padding: 20px 22px; border: 1px solid var(--line); border-radius: 18px; }
  .toc__list { columns: 2; column-gap: 32px; }
  .toc__list li { break-inside: avoid; }
}

@media (max-width: 768px) {
  .pill__label { display: none; }
  .meta__facts { gap: 22px; }
  .cover img { aspect-ratio: 4 / 3; }
  .cover__card { position: static; max-width: none; margin-top: -24px; margin-inline: 12px; }
  .toc__list { columns: 1; }
  .foot { flex-direction: column; align-items: flex-start; gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; transition-delay: 0s !important; animation: none !important; }
}