/* ==========================================================================
   SECTIONS — hero, manifesto, solution chapters, process, marquee, security
   ========================================================================== */

/* Hero ------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--header-h) + 2rem) 0 7rem;
}
.hero__inner { position: relative; }
.hero__content { max-width: 54vw; position: relative; }
.hero__content::before {
  content: '';
  position: absolute; inset: -18% -30% -18% -40%; z-index: -1;
  background: radial-gradient(closest-side, rgba(2, 3, 10, 0.62), transparent);
  pointer-events: none;
}

.hero__title {
  margin-top: 1.6rem;
  font-size: clamp(2.5rem, 4.7vw, 5.2rem);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.045em;
}

/* Line mask reveal: vertical padding keeps Vietnamese stacked diacritics
   (ệ, ữ, ạ) from being clipped by the overflow mask. */
.line {
  display: block;
  overflow: hidden;
  padding: 0.14em 0 0.16em;
  margin: -0.14em 0 -0.16em;
}
.line > span {
  display: inline-block;
  transform: translate3d(0, 115%, 0);
  transition: transform 1.3s var(--ease-out);
}
.line:nth-child(2) > span { transition-delay: 0.1s; }
.line:nth-child(3) > span { transition-delay: 0.2s; }
.no-js .line > span, .is-hero-in .line > span { transform: none; }

.hero__lead {
  margin-top: 1.8rem;
  max-width: 34rem;
  font-size: clamp(1rem, 1.25vw, 1.15rem);
  color: var(--text);
}
.hero__actions { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 0.9rem; }

.js .hero-fade {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition: opacity 1.1s var(--ease-out), transform 1.2s var(--ease-out);
}
.js .hero__lead { transition-delay: 0.45s; }
.js .hero__actions { transition-delay: 0.6s; }
.js .hero__meta { transition-delay: 0.9s; }
.is-hero-in .hero-fade { opacity: 1; transform: none; }

.hero__fallback-mark {
  display: none;
  position: absolute; right: var(--gutter); top: 50%;
  width: min(36vw, 460px); height: auto;
  transform: translateY(-50%);
  fill: url(#grad-brand);
  filter: drop-shadow(0 0 60px rgba(143, 61, 255, 0.45));
  opacity: 0.9;
}
.no-webgl .hero__fallback-mark, .no-js .hero__fallback-mark { display: block; }

.hero__meta {
  position: absolute; left: 0; right: 0; bottom: 1.8rem;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: end; gap: 1rem;
  font: 400 0.72rem/1.4 var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--text-dim);
}
.hero__hint { display: flex; align-items: center; gap: 0.6rem; }
.hero__hint-touch { display: none; }
.hero__coords { text-align: right; }
.pulse-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 0 rgba(62, 230, 176, 0.6);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  70% { box-shadow: 0 0 0 10px rgba(62, 230, 176, 0); }
  100% { box-shadow: 0 0 0 0 rgba(62, 230, 176, 0); }
}
.scroll-cue {
  display: grid; justify-items: center; gap: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.2em;
}
.scroll-cue i {
  width: 1px; height: 46px;
  background: linear-gradient(180deg, transparent, var(--text-muted));
  position: relative; overflow: hidden;
}
.scroll-cue i::after {
  content: '';
  position: absolute; left: 0; top: -40%; width: 1px; height: 40%;
  background: #fff;
  animation: scroll-cue 2.2s var(--ease-in-out) infinite;
}
@keyframes scroll-cue { to { top: 110%; } }

/* Manifesto -------------------------------------------------------------- */
.manifesto { position: relative; height: 230vh; }
.manifesto__sticky {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  display: flex; align-items: center;
}
.manifesto__inner { display: grid; gap: 2.2rem; }
.manifesto__text {
  max-width: 62rem;
  font: 500 clamp(1.75rem, 3.7vw, 3.35rem)/1.28 var(--font-display);
  letter-spacing: -0.028em;
  color: var(--text-hi);
  text-shadow: 0 2px 30px rgba(2, 3, 10, 0.8);
}
.manifesto__text em { font-style: normal; }
.manifesto__text .w { opacity: var(--o, 0.14); transition: opacity 0.2s linear; }
.manifesto__text .w--hl {
  background: var(--grad-text);
  background-size: var(--bs, 100%) 100%;
  background-position: var(--bp, 0%) 0;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.manifesto__principles { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.manifesto__principles li {
  display: inline-flex; align-items: center; gap: 0.7rem;
  padding: 0.6rem 1.1rem 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(5, 7, 15, 0.5);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font: 400 0.9rem/1 var(--font-display);
  color: var(--text);
}
.manifesto__principles span {
  display: grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--grad-soft);
  font: 500 0.64rem/1 var(--font-mono);
  color: var(--text-hi);
}

/* Solutions & chapters -------------------------------------------------- */
.solutions { position: relative; padding-top: clamp(4rem, 10vw, 8rem); }
.solutions > .section-head { padding-bottom: 2rem; }

.chapter {
  position: relative;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  padding: 10vh 0;
}
.chapter__content {
  position: relative;
  max-width: 34rem;
}
.chapter__content::before {
  content: '';
  position: absolute; inset: -14% -22%; z-index: -1;
  background: radial-gradient(closest-side, rgba(2, 3, 10, 0.72), transparent);
  pointer-events: none;
}
.chapter--right .chapter__content { margin-left: auto; }

.chapter__number {
  position: absolute; top: 8vh; left: var(--gutter);
  font: 700 clamp(9rem, 24vw, 22rem)/0.8 var(--font-display);
  letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(170, 180, 255, 0.09);
  pointer-events: none; user-select: none;
  transform: translate3d(0, var(--parallax, 0px), 0);
}
.chapter--right .chapter__number { left: auto; right: var(--gutter); }

.chapter__index {
  font: 500 0.78rem/1 var(--font-mono);
  color: var(--text-dim);
  letter-spacing: 0.12em;
}
.chapter__index b {
  font-weight: 500;
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.chapter__kicker {
  margin-top: 1.4rem;
  font: 500 0.74rem/1.4 var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.chapter__title {
  margin-top: 0.8rem;
  font-size: clamp(2rem, 3.7vw, 3.35rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}
.chapter__lead { margin-top: 1.2rem; font-size: clamp(1rem, 1.15vw, 1.1rem); color: var(--text); }
.chapter__list { margin-top: 1.6rem; display: grid; gap: 0.85rem; }
.chapter__list li { display: flex; gap: 0.8rem; align-items: flex-start; color: var(--text); font-size: 0.97rem; }
.chapter__list b { color: var(--text-hi); font-weight: 600; }
.chapter__list .icon {
  margin-top: 0.2rem;
  width: 22px; height: 22px; padding: 4px;
  border-radius: 50%;
  background: var(--grad-soft);
  color: #c9b6ff;
  stroke-width: 2.2;
}
.chapter__tags { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chapter__tags li {
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 400 0.76rem/1 var(--font-mono);
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.02);
}
.chapter__cta {
  margin-top: 2rem;
  display: inline-flex; align-items: center; gap: 0.6rem;
  font: 500 0.95rem/1 var(--font-display);
  color: var(--text-hi);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color 0.3s, gap 0.4s var(--ease-out);
  --extra-transition: border-color 0.3s, gap 0.4s var(--ease-out);
}
.chapter__cta:hover { border-color: var(--violet); gap: 0.9rem; }

/* Process ---------------------------------------------------------------- */
.process { position: relative; padding: clamp(6rem, 12vw, 10rem) 0; }
.process__track {
  --p: 0;
  position: relative;
  margin-top: clamp(3rem, 6vw, 5rem);
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1.5rem;
}
.process__track::before, .process__track::after {
  content: '';
  position: absolute; top: 9px; left: 0; right: 0; height: 1px;
}
.process__track::before { background: var(--line-strong); }
.process__track::after {
  background: var(--grad);
  transform-origin: left; transform: scaleX(var(--p));
  box-shadow: 0 0 14px rgba(143, 61, 255, 0.8);
}
.process__step {
  position: relative;
  margin-top: 2.1rem;
  padding: 1.3rem 1.2rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(6, 8, 20, 0.62);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  backdrop-filter: blur(14px) saturate(130%);
  transition: border-color 0.5s, box-shadow 0.5s;
  --extra-transition: border-color 0.5s, box-shadow 0.5s;
}
.process__step.is-lit { border-color: rgba(155, 92, 255, 0.35); box-shadow: 0 20px 50px -30px rgba(143, 61, 255, 0.7); }
.process__node {
  position: absolute; top: -2.1rem; left: 1.2rem; z-index: 1;
  width: 19px; height: 19px; border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--ink-1);
  transition: background-color 0.5s, border-color 0.5s, box-shadow 0.5s;
}
.process__step.is-lit .process__node {
  border-color: transparent;
  background: var(--grad);
  box-shadow: 0 0 0 5px rgba(143, 61, 255, 0.18), 0 0 22px rgba(143, 61, 255, 0.8);
}
.process__num { font: 500 0.75rem/1 var(--font-mono); color: var(--text-dim); letter-spacing: 0.12em; }
.process__step h3 { margin-top: 0.8rem; font-size: 1.2rem; letter-spacing: -0.02em; }
.process__step p { margin-top: 0.6rem; font-size: 0.92rem; color: var(--text-muted); }

/* Marquee ---------------------------------------------------------------- */
.marquee {
  position: relative; z-index: 1;
  padding: 1.6rem 0;
  border-block: 1px solid var(--line);
  background: rgba(3, 4, 11, 0.45);
  overflow: hidden;
  display: grid; gap: 0.6rem;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee__row {
  display: flex; align-items: center; gap: 2.2rem;
  width: max-content;
  animation: marquee 48s linear infinite;
  animation-play-state: var(--play, running);
}
.marquee__row--reverse { animation-direction: reverse; animation-duration: 56s; }
.marquee__row span {
  font: 500 clamp(1.4rem, 3.2vw, 2.6rem)/1.2 var(--font-display);
  letter-spacing: -0.03em;
  color: var(--text-hi);
  white-space: nowrap;
}
.marquee__row span:nth-of-type(even) { color: transparent; -webkit-text-stroke: 1px rgba(200, 205, 255, 0.4); }
.marquee__row i { width: 10px; height: 10px; border-radius: 50%; background: var(--grad); flex: none; }
@keyframes marquee { to { transform: translate3d(-50%, 0, 0); } }

/* Security --------------------------------------------------------------- */
.security { position: relative; padding: clamp(6rem, 12vw, 10rem) 0; min-height: 100vh; display: flex; align-items: center; }
.security__grid { display: grid; grid-template-columns: 1fr 1fr; }
.security__content { grid-column: 2; }
.security__list { margin-top: 2.5rem; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* Responsive ------------------------------------------------------------- */
@media (max-width: 1024px) {
  .process__track { grid-template-columns: 1fr; gap: 0; padding-left: 2.4rem; }
  .process__track::before, .process__track::after { top: 0; bottom: 0; left: 9px; right: auto; width: 1px; height: auto; }
  .process__track::after { transform-origin: top; transform: scaleY(var(--p)); }
  .process__step { margin: 0 0 1rem; }
  .process__node { top: 1.4rem; left: -2.4rem; }
  .security__grid { grid-template-columns: 1fr; }
  .security__content { grid-column: 1; }
}
@media (max-width: 900px) {
  .hero { justify-content: flex-end; padding-top: 44vh; padding-top: 44svh; padding-bottom: 6.5rem; }
  .hero__meta { grid-template-columns: 1fr; justify-items: start; gap: 0.6rem; }
  .hero__coords, .scroll-cue { display: none; }
  .hero__content { max-width: none; }
  .hero__content::before { inset: -10% -4%; }
  .chapter__content::before { inset: -8% -4%; }
  .chapter { align-items: flex-end; padding: 44vh 0 10vh; }
  .chapter--right .chapter__content { margin-left: 0; }
  .chapter__number { top: 4vh; }
  .manifesto { height: 200vh; }
}
@media (hover: none), (pointer: coarse) {
  .hero__hint-fine { display: none; }
  .hero__hint-touch { display: inline; }
}
@media (max-width: 560px) {
  .security__list { grid-template-columns: 1fr; }
  .hero__actions .btn { width: 100%; }
}