/* ==========================================================================
   Belqo.website — Tactile Future
   Soft surfaces. Hard ideas.
   ========================================================================== */

:root {
  --carbon: #101417;
  --porcelain: #F2F0E9;
  --mineral: #52766D;
  --amber: #D49A55;
  --muted: #7E8581;

  --font-display: "Plus Jakarta Sans", sans-serif;
  --font-body: "Inter", sans-serif;

  --space-xs: clamp(0.5rem, 1vw, 0.75rem);
  --space-sm: clamp(0.75rem, 1.5vw, 1.25rem);
  --space-md: clamp(1.25rem, 3vw, 2rem);
  --space-lg: clamp(2rem, 5vw, 4rem);
  --space-xl: clamp(3.5rem, 8vw, 7rem);
  --space-2xl: clamp(5rem, 12vw, 10rem);

  --pad-x: clamp(1.25rem, 4vw, 4.5rem);
  --nav-h: 4.25rem;
  --radius-soft: 2.5rem;
  --radius-pill: 999px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-soft: 0 24px 60px rgba(16, 20, 23, 0.12);
  --shadow-inset: inset 0 1px 0 rgba(242, 240, 233, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--carbon);
  background: var(--porcelain);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--mineral);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--pad-x);
  z-index: 1000;
  padding: 0.75rem 1rem;
  background: var(--carbon);
  color: var(--porcelain);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.skip-link:focus {
  top: 0.75rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 3rem;
  padding: 0.85rem 1.45rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  transition:
    transform 0.45s var(--ease),
    background-color 0.35s var(--ease),
    color 0.35s var(--ease),
    border-color 0.35s var(--ease),
    box-shadow 0.45s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--carbon);
  color: var(--porcelain);
  box-shadow: 0 10px 28px rgba(16, 20, 23, 0.16);
}

.btn--primary:hover {
  background: #1a2126;
}

.btn--ghost {
  color: var(--carbon);
  border-bottom: 1px solid rgba(16, 20, 23, 0.28);
  padding-left: 0;
  padding-right: 0;
  border-radius: 0;
}

.btn--ghost:hover {
  border-bottom-color: var(--mineral);
  color: var(--mineral);
}

.btn--accent {
  background: var(--mineral);
  color: var(--porcelain);
  box-shadow: 0 12px 32px rgba(82, 118, 109, 0.28);
}

.btn--accent:hover {
  background: #46665e;
}

.btn--dark {
  background: var(--carbon);
  color: var(--porcelain);
}

.btn--dark:hover {
  background: #1a2126;
}

.btn--outline-light {
  color: var(--porcelain);
  border: 1px solid rgba(242, 240, 233, 0.35);
  background: transparent;
}

.btn--outline-light:hover {
  border-color: var(--porcelain);
  background: rgba(242, 240, 233, 0.04);
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-label--light {
  color: rgba(242, 240, 233, 0.55);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(242, 240, 233, 0.92);
  border-bottom: 1px solid rgba(16, 20, 23, 0.1);
  backdrop-filter: saturate(120%) blur(10px);
}

.site-header:has(.nav__toggle:checked) {
  border-bottom-color: transparent;
}

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: var(--nav-h);
  padding: 0 var(--pad-x);
}

.nav__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15rem;
  justify-self: start;
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
}

.nav__tld {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--muted);
  transform: translateY(-0.15em);
}

.nav__system {
  justify-self: center;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.nav__cta {
  justify-self: end;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: color 0.3s var(--ease);
}

.nav__cta:hover {
  color: var(--mineral);
}

.nav__mobile {
  display: none;
  align-items: center;
  gap: 1.25rem;
  justify-self: end;
}

.nav__toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.nav__menu-btn {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.nav__drawer {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  display: none;
  flex-direction: column;
  gap: 0.15rem;
  padding: 1rem var(--pad-x) 1.25rem;
  background: var(--porcelain);
  border-bottom: 1px solid rgba(16, 20, 23, 0.1);
  box-shadow: 0 18px 40px rgba(16, 20, 23, 0.08);
}

.nav__drawer a {
  padding: 0.7rem 0.55rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-bottom: 1px solid rgba(16, 20, 23, 0.08);
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.nav__drawer a:last-child {
  border-bottom: 0;
}

.nav__drawer a:hover {
  color: var(--mineral);
  padding-left: 0.85rem;
}

@media (max-width: 768px) {
  .site-header:has(.nav__toggle:checked) .nav__drawer {
    display: flex;
  }
}

.nav__toggle:focus-visible + .nav__menu-btn {
  outline: 2px solid var(--mineral);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   Belqo Core — signature object
   -------------------------------------------------------------------------- */

.belqo-core {
  position: relative;
  width: min(100%, 28rem);
  aspect-ratio: 1;
  margin-inline: auto;
}

.belqo-core--hero {
  width: min(100%, 32rem);
}

.belqo-core--large {
  width: min(100%, 38rem);
}

.belqo-core__outer {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 48% 52% 50% 50% / 50% 48% 52% 50%;
  background:
    radial-gradient(circle at 32% 28%, rgba(242, 240, 233, 0.08), transparent 42%),
    radial-gradient(circle at 70% 72%, rgba(82, 118, 109, 0.18), transparent 45%),
    linear-gradient(160deg, #171c20 0%, var(--carbon) 55%, #0c1013 100%);
  box-shadow:
    0 40px 80px rgba(16, 20, 23, 0.28),
    0 8px 24px rgba(16, 20, 23, 0.18),
    inset 0 1px 0 rgba(242, 240, 233, 0.1),
    inset 0 -20px 40px rgba(0, 0, 0, 0.35);
  animation: coreRotate 14s var(--ease) infinite;
}

.belqo-core__ring {
  position: absolute;
  inset: 0;
  margin: auto;
  border-radius: 50%;
  pointer-events: none;
}

.belqo-core__ring--outer {
  width: 86%;
  height: 86%;
  border: 1px solid rgba(242, 240, 233, 0.18);
  box-shadow: inset 0 0 0 1px rgba(242, 240, 233, 0.04);
}

.belqo-core__ring--mid {
  width: 68%;
  height: 68%;
  border: 1px solid rgba(82, 118, 109, 0.75);
  box-shadow:
    0 0 0 8px rgba(82, 118, 109, 0.08),
    inset 0 0 24px rgba(82, 118, 109, 0.12);
}

.belqo-core__ring--inner {
  width: 42%;
  height: 42%;
  border: 1px solid rgba(242, 240, 233, 0.22);
  background:
    radial-gradient(circle at 40% 35%, rgba(242, 240, 233, 0.08), transparent 55%),
    rgba(16, 20, 23, 0.55);
}

.belqo-core__dial {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 78%;
  height: 78%;
  border-radius: 50%;
  animation: dialDrift 18s var(--ease) infinite;
}

.belqo-core__tick {
  position: absolute;
  background: rgba(242, 240, 233, 0.55);
  border-radius: 1px;
}

.belqo-core__tick--1,
.belqo-core__tick--2,
.belqo-core__tick--3,
.belqo-core__tick--4,
.belqo-core__tick--5,
.belqo-core__tick--6 {
  width: 1px;
  height: 7%;
  left: 50%;
  top: 4%;
  transform-origin: 50% 560%;
}

.belqo-core__tick--1 { transform: translateX(-50%) rotate(0deg); }
.belqo-core__tick--2 { transform: translateX(-50%) rotate(90deg); }
.belqo-core__tick--3 { transform: translateX(-50%) rotate(180deg); }
.belqo-core__tick--4 { transform: translateX(-50%) rotate(270deg); }
.belqo-core__tick--5 { transform: translateX(-50%) rotate(45deg); height: 4.5%; opacity: 0.45; }
.belqo-core__tick--6 { transform: translateX(-50%) rotate(135deg); height: 4.5%; opacity: 0.45; }

.belqo-core__mark {
  position: absolute;
  font-family: var(--font-body);
  font-size: 0.55rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: rgba(242, 240, 233, 0.45);
}

.belqo-core__mark--n { top: 10%; left: 50%; transform: translateX(-50%); }
.belqo-core__mark--e { right: 10%; top: 50%; transform: translateY(-50%); }
.belqo-core__mark--s { bottom: 10%; left: 50%; transform: translateX(-50%); }
.belqo-core__mark--w { left: 10%; top: 50%; transform: translateY(-50%); }

.belqo-core__center {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 28%;
  height: 28%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, #2a3238, #14191d 70%);
  box-shadow:
    0 8px 20px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(242, 240, 233, 0.12);
}

.belqo-core__hub {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 38%;
  height: 38%;
  border-radius: 50%;
  background: linear-gradient(160deg, #1c2328, var(--carbon));
  border: 1px solid rgba(242, 240, 233, 0.12);
}

.belqo-core__indicator {
  position: absolute;
  top: 12%;
  left: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow:
    0 0 0 3px rgba(212, 154, 85, 0.18),
    0 0 12px rgba(212, 154, 85, 0.35);
  transform: translateX(-50%);
  animation: indicatorPulse 5.5s var(--ease) infinite;
}

.belqo-core__readout {
  position: absolute;
  left: 50%;
  bottom: 11%;
  display: grid;
  gap: 0.2rem;
  transform: translateX(-50%);
  text-align: center;
  font-size: 0.55rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: rgba(242, 240, 233, 0.5);
}

.belqo-core__plate {
  position: absolute;
  inset: 18%;
  border-radius: 42% 58% 48% 52% / 52% 46% 54% 48%;
  border: 1px solid rgba(242, 240, 233, 0.06);
  background: linear-gradient(145deg, transparent 40%, rgba(82, 118, 109, 0.08) 100%);
  pointer-events: none;
}

@keyframes coreRotate {
  0% { transform: rotate(-3deg); }
  50% { transform: rotate(3deg); }
  100% { transform: rotate(-3deg); }
}

@keyframes dialDrift {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(8deg); }
  100% { transform: rotate(0deg); }
}

@keyframes indicatorPulse {
  0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
  50% { opacity: 0.75; transform: translateX(-50%) scale(0.92); }
}

@keyframes revealUp {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes lineGrow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* --------------------------------------------------------------------------
   1. Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  padding: var(--space-xl) var(--pad-x) var(--space-lg);
  background:
    radial-gradient(ellipse 80% 55% at 85% 20%, rgba(82, 118, 109, 0.08), transparent 60%),
    radial-gradient(ellipse 50% 40% at 10% 90%, rgba(212, 154, 85, 0.05), transparent 55%),
    linear-gradient(180deg, #F5F3ED 0%, var(--porcelain) 45%, #ECEAE2 100%);
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-md);
  align-items: center;
  max-width: 90rem;
  margin: 0 auto;
}

.hero__content {
  grid-column: 1 / span 6;
  max-width: 38rem;
  animation: revealUp 1s var(--ease-out) both;
}

.hero__label {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin-bottom: var(--space-md);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 10rem);
  font-weight: 800;
  line-height: 0.86;
  letter-spacing: -0.065em;
  text-align: left;
}

.hero__headline span {
  display: block;
}

.hero__intent {
  color: var(--mineral);
}

.hero__copy {
  max-width: 28rem;
  margin-top: var(--space-md);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem 1.75rem;
  margin-top: var(--space-lg);
}

.hero__object {
  position: relative;
  grid-column: 7 / span 6;
  display: grid;
  place-items: center;
  min-height: 28rem;
  animation: revealUp 1.15s 0.12s var(--ease-out) both;
}

.micro-label {
  position: absolute;
  z-index: 2;
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.micro-label--1 { top: 6%; left: 4%; }
.micro-label--2 { top: 10%; right: 2%; }
.micro-label--3 { bottom: 18%; left: 0; }
.micro-label--4 { bottom: 10%; right: 6%; }

.hero__scroll {
  max-width: 90rem;
  margin: var(--space-lg) auto 0;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(16, 20, 23, 0.08);
}

.hero__scroll a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.hero__scroll a:hover {
  color: var(--carbon);
}

/* --------------------------------------------------------------------------
   2. Statement
   -------------------------------------------------------------------------- */

.statement {
  background:
    radial-gradient(ellipse 70% 50% at 80% 0%, rgba(82, 118, 109, 0.14), transparent 55%),
    linear-gradient(180deg, #12171b 0%, var(--carbon) 100%);
  color: var(--porcelain);
  padding: var(--space-2xl) var(--pad-x);
}

.statement__inner {
  max-width: 56rem;
}

.statement__headline {
  margin-top: var(--space-md);
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 9vw, 8.5rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.06em;
}

.statement__headline span {
  display: block;
}

.statement__rule {
  width: min(12rem, 40%);
  height: 2px;
  margin: var(--space-lg) 0;
  background: var(--mineral);
  transform-origin: left center;
  animation: lineGrow 1.4s var(--ease-out) both;
}

.statement__copy {
  max-width: 28rem;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: rgba(242, 240, 233, 0.68);
}

/* --------------------------------------------------------------------------
   3. Principles
   -------------------------------------------------------------------------- */

.principles {
  padding: var(--space-2xl) var(--pad-x);
  background:
    linear-gradient(180deg, #EFEDE6 0%, var(--porcelain) 100%);
}

.principles__header {
  margin-bottom: var(--space-lg);
}

.principles__list {
  max-width: 90rem;
  margin: 0 auto;
  border-top: 1px solid rgba(16, 20, 23, 0.12);
}

.principle {
  position: relative;
  display: grid;
  grid-template-columns: 7rem 1fr auto;
  gap: var(--space-md);
  align-items: center;
  padding: clamp(1.75rem, 4vw, 3rem) 0;
  border-bottom: 1px solid rgba(16, 20, 23, 0.12);
  transition: transform 0.45s var(--ease), padding-left 0.45s var(--ease);
}

.principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  background: var(--mineral);
  transform: translateY(-50%);
  transition: height 0.4s var(--ease);
}

.principle:hover,
.principle:focus-visible {
  transform: translateX(0.55rem);
  padding-left: 0.85rem;
}

.principle:hover::before,
.principle:focus-visible::before {
  height: 55%;
}

.principle__num {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(16, 20, 23, 0.18);
  transition: color 0.35s var(--ease);
}

.principle:hover .principle__num,
.principle:focus-visible .principle__num {
  color: var(--mineral);
}

.principle__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
}

.principle__desc {
  margin-top: 0.55rem;
  font-size: 1.05rem;
  color: var(--muted);
}

.principle__arrow {
  font-size: 1.5rem;
  color: var(--muted);
  transition: transform 0.4s var(--ease), color 0.35s var(--ease);
}

.principle:hover .principle__arrow,
.principle:focus-visible .principle__arrow {
  transform: translateX(0.45rem);
  color: var(--mineral);
}

/* --------------------------------------------------------------------------
   4. Belqo Core section
   -------------------------------------------------------------------------- */

.core-section {
  padding: var(--space-2xl) var(--pad-x);
  background:
    radial-gradient(circle at 50% 55%, rgba(82, 118, 109, 0.07), transparent 42%),
    linear-gradient(180deg, var(--porcelain) 0%, #EAE8E0 100%);
}

.core-section__header {
  max-width: 90rem;
  margin: 0 auto var(--space-xl);
}

.core-section__headline {
  margin-top: var(--space-sm);
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.06em;
}

.core-section__headline span {
  display: block;
}

.core-section__stage {
  position: relative;
  display: grid;
  place-items: center;
  max-width: 52rem;
  margin: 0 auto;
  min-height: clamp(22rem, 55vw, 40rem);
  padding: var(--space-xl) var(--space-md);
}

.annotation {
  position: absolute;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.annotation__line {
  display: block;
  height: 1px;
  background: rgba(16, 20, 23, 0.22);
}

.annotation--tl {
  top: 8%;
  left: 0;
}

.annotation--tl .annotation__line {
  width: clamp(2.5rem, 8vw, 5rem);
}

.annotation--tr {
  top: 12%;
  right: 0;
  flex-direction: row-reverse;
}

.annotation--tr .annotation__line {
  width: clamp(2.5rem, 8vw, 5rem);
}

.annotation--bl {
  bottom: 14%;
  left: 0;
}

.annotation--bl .annotation__line {
  width: clamp(2rem, 7vw, 4rem);
}

.annotation--br {
  bottom: 10%;
  right: 0;
  flex-direction: row-reverse;
}

.annotation--br .annotation__line {
  width: clamp(2rem, 7vw, 4rem);
}

.core-section__caption {
  max-width: 28rem;
  margin: var(--space-lg) auto 0;
  text-align: center;
  font-size: 1rem;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   5. System Overview
   -------------------------------------------------------------------------- */

.system {
  padding: var(--space-2xl) var(--pad-x);
  background:
    radial-gradient(ellipse 60% 40% at 20% 0%, rgba(82, 118, 109, 0.12), transparent 50%),
    var(--carbon);
  color: var(--porcelain);
}

.system__header {
  max-width: 90rem;
  margin: 0 auto var(--space-xl);
}

.system__headline {
  margin-top: var(--space-md);
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.055em;
}

.system__headline span {
  display: block;
}

.system__track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  max-width: 90rem;
  margin: 0 auto;
  padding-top: var(--space-md);
}

.system__track::before {
  content: "";
  position: absolute;
  top: 1.15rem;
  left: 4%;
  right: 4%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--mineral) 10%,
    var(--mineral) 90%,
    transparent
  );
}

.system__stage {
  position: relative;
  padding-top: 2.5rem;
}

.system__stage::before {
  content: "";
  position: absolute;
  top: 0.85rem;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--mineral);
  box-shadow: 0 0 0 4px rgba(82, 118, 109, 0.18);
}

.system__num {
  display: block;
  margin-bottom: 0.85rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: rgba(242, 240, 233, 0.45);
}

.system__title {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.65rem;
}

.system__desc {
  max-width: 14rem;
  font-size: 0.95rem;
  color: rgba(242, 240, 233, 0.58);
}

/* --------------------------------------------------------------------------
   6. Material Studies
   -------------------------------------------------------------------------- */

.studies {
  padding: var(--space-2xl) var(--pad-x);
  background: var(--porcelain);
}

.studies__header {
  max-width: 90rem;
  margin: 0 auto var(--space-xl);
}

.studies__headline {
  margin-top: var(--space-sm);
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
}

.studies__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  max-width: 90rem;
  margin: 0 auto;
}

.study {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.study__label {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.study__surface {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  transition: transform 0.55s var(--ease), box-shadow 0.55s var(--ease);
}

.study:hover .study__surface {
  transform: translateY(-6px);
}

.study__note {
  font-size: 0.95rem;
  color: var(--muted);
}

/* 01 Soft */
.study--soft .study__surface {
  background:
    linear-gradient(160deg, #F7F5EF 0%, var(--porcelain) 45%, #E5E2D8 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.55),
    0 20px 40px rgba(16, 20, 23, 0.06);
}

.study__form--raised {
  position: absolute;
  inset: 22% 18% 28% 22%;
  border-radius: 38% 48% 42% 52% / 48% 40% 54% 46%;
  background:
    linear-gradient(155deg, #1a2025 0%, var(--carbon) 60%, #0b0f12 100%);
  box-shadow:
    0 28px 48px rgba(16, 20, 23, 0.28),
    0 8px 16px rgba(16, 20, 23, 0.16),
    inset 0 1px 0 rgba(242, 240, 233, 0.1);
}

.study__form--raised::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: inherit;
  border: 1px solid rgba(242, 240, 233, 0.1);
}

/* 02 Balance */
.study--balance .study__surface {
  background:
    radial-gradient(circle at 70% 30%, rgba(242, 240, 233, 0.55), transparent 40%),
    linear-gradient(180deg, #E8E5DC 0%, #DDD9CF 100%);
}

.study__frame {
  position: absolute;
  inset: 18% 16%;
  border: 1px solid rgba(16, 20, 23, 0.35);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  transform: rotate(-8deg);
}

.study__frame::before,
.study__frame::after {
  content: "";
  position: absolute;
  background: rgba(16, 20, 23, 0.2);
}

.study__frame::before {
  top: 50%;
  left: -8%;
  right: -8%;
  height: 1px;
}

.study__frame::after {
  left: 50%;
  top: -8%;
  bottom: -8%;
  width: 1px;
}

.study__form--intersect {
  position: absolute;
  width: 48%;
  height: 48%;
  top: 28%;
  left: 30%;
  border-radius: 50% 46% 54% 48% / 48% 52% 46% 54%;
  background:
    linear-gradient(145deg, #62887e 0%, var(--mineral) 55%, #3f5c55 100%);
  box-shadow:
    0 24px 40px rgba(82, 118, 109, 0.28),
    inset 0 1px 0 rgba(242, 240, 233, 0.2);
  transform: rotate(12deg);
  clip-path: ellipse(50% 48% at 50% 50%);
}

/* 03 Signal */
.study--signal .study__surface {
  background:
    radial-gradient(circle at 35% 30%, rgba(242, 240, 233, 0.06), transparent 40%),
    linear-gradient(160deg, #171c20 0%, var(--carbon) 100%);
  box-shadow: 0 20px 40px rgba(16, 20, 23, 0.18);
}

.study__form--signal {
  position: absolute;
  inset: 24% 20%;
  border-radius: 1.5rem;
  border: 1px solid rgba(242, 240, 233, 0.12);
  background:
    linear-gradient(180deg, rgba(242, 240, 233, 0.03), transparent 50%);
  clip-path: polygon(0 8%, 100% 0, 100% 92%, 0 100%);
}

.study__amber {
  position: absolute;
  top: 34%;
  right: 28%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow:
    0 0 0 6px rgba(212, 154, 85, 0.12),
    0 0 24px rgba(212, 154, 85, 0.35);
  animation: indicatorPulse 6s var(--ease) infinite;
}

/* --------------------------------------------------------------------------
   7. Perspective
   -------------------------------------------------------------------------- */

.perspective {
  position: relative;
  overflow: hidden;
  padding: var(--space-2xl) var(--pad-x);
  background:
    linear-gradient(145deg, #5d8379 0%, var(--mineral) 45%, #45665e 100%);
  color: var(--carbon);
}

.perspective__shape {
  position: absolute;
  width: min(70vw, 42rem);
  aspect-ratio: 1;
  right: -8%;
  top: 50%;
  transform: translateY(-50%) rotate(18deg);
  border-radius: 42% 58% 48% 52% / 52% 42% 58% 48%;
  background:
    linear-gradient(160deg, rgba(16, 20, 23, 0.12), rgba(16, 20, 23, 0.04));
  box-shadow:
    0 40px 80px rgba(16, 20, 23, 0.18),
    inset 0 0 0 1px rgba(16, 20, 23, 0.08);
}

.perspective__shape::before {
  content: "";
  position: absolute;
  inset: 14%;
  border-radius: inherit;
  border: 1px solid rgba(16, 20, 23, 0.12);
  transform: rotate(-12deg);
}

.perspective__shape::after {
  content: "";
  position: absolute;
  inset: 28%;
  border-radius: 50%;
  background: rgba(16, 20, 23, 0.08);
  box-shadow: 0 20px 40px rgba(16, 20, 23, 0.1);
}

.perspective__inner {
  position: relative;
  z-index: 1;
  max-width: 48rem;
}

.perspective__headline {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 8.5rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.06em;
}

.perspective__headline span {
  display: block;
}

.perspective__copy {
  max-width: 26rem;
  margin: var(--space-md) 0 var(--space-lg);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: rgba(16, 20, 23, 0.72);
}

/* --------------------------------------------------------------------------
   8. Final CTA
   -------------------------------------------------------------------------- */

.final-cta {
  padding: var(--space-2xl) var(--pad-x);
  background:
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(212, 154, 85, 0.08), transparent 50%),
    radial-gradient(ellipse 40% 35% at 10% 80%, rgba(82, 118, 109, 0.1), transparent 50%),
    var(--carbon);
  color: var(--porcelain);
}

.final-cta__inner {
  max-width: 56rem;
}

.final-cta__headline {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 8.5rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.06em;
}

.final-cta__headline span {
  display: block;
}

.final-cta__detail {
  color: var(--amber);
}

.final-cta__copy {
  max-width: 28rem;
  margin: var(--space-md) 0 var(--space-lg);
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  color: rgba(242, 240, 233, 0.62);
}

.final-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.25rem;
}

/* --------------------------------------------------------------------------
   9. Footer
   -------------------------------------------------------------------------- */

.footer {
  padding: var(--space-xl) var(--pad-x) var(--space-lg);
  background: #0c1013;
  color: var(--porcelain);
  border-top: 1px solid rgba(242, 240, 233, 0.06);
}

.footer__top {
  display: grid;
  grid-template-columns: 1.2fr 1.5fr;
  gap: var(--space-xl);
  max-width: 90rem;
  margin: 0 auto;
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(242, 240, 233, 0.08);
}

.footer__logo {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
}

.footer__tld {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.footer__tagline {
  margin-top: var(--space-sm);
  font-size: 1.05rem;
  color: rgba(242, 240, 233, 0.55);
  font-style: italic;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  align-content: start;
}

.footer__col h3 {
  margin-bottom: 1rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.footer__col li + li {
  margin-top: 0.65rem;
}

.footer__col a {
  font-size: 0.95rem;
  color: rgba(242, 240, 233, 0.58);
  transition: color 0.3s var(--ease);
}

.footer__col a:hover,
.footer__col a:focus-visible {
  color: var(--porcelain);
}

.footer__bottom {
  max-width: 90rem;
  margin: 0 auto;
  padding-top: var(--space-md);
}

.footer__bottom p {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: rgba(242, 240, 233, 0.45);
}

.footer__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(212, 154, 85, 0.15);
}

/* --------------------------------------------------------------------------
   Responsive — Tablet
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .hero__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .hero__content,
  .hero__object {
    grid-column: 1;
  }

  .hero__object {
    min-height: 22rem;
  }

  .belqo-core--hero {
    width: min(100%, 26rem);
  }

  .micro-label--3,
  .micro-label--4 {
    display: none;
  }

  .principle {
    grid-template-columns: 5rem 1fr auto;
  }

  .studies__grid {
    grid-template-columns: 1fr;
    max-width: 28rem;
  }

  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* --------------------------------------------------------------------------
   Responsive — Mobile
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
  .nav {
    grid-template-columns: 1fr auto;
    gap: 1rem;
  }

  .nav__system,
  .nav__cta {
    display: none;
  }

  .nav__mobile {
    display: inline-flex;
  }

  .nav__mobile-system {
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.16em;
    color: var(--muted);
  }

  .hero {
    padding-top: var(--space-lg);
    min-height: auto;
  }

  .hero__headline {
    font-size: clamp(3.4rem, 18vw, 5.5rem);
  }

  .hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero__object {
    min-height: 18rem;
  }

  .belqo-core--hero,
  .belqo-core--large {
    width: min(100%, 20rem);
  }

  .micro-label {
    display: none;
  }

  .annotation {
    position: static;
    justify-content: center;
    margin-bottom: 0.5rem;
  }

  .annotation__line {
    display: none;
  }

  .core-section__stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: var(--space-md) 0;
    min-height: auto;
  }

  .core-section__stage .belqo-core {
    order: -1;
    margin-bottom: var(--space-md);
  }

  .principle {
    grid-template-columns: 3.5rem 1fr auto;
    gap: 0.85rem;
  }

  .principle__desc {
    font-size: 0.95rem;
  }

  .system__track {
    grid-template-columns: 1fr;
    gap: 0;
    padding-left: 1.25rem;
  }

  .system__track::before {
    top: 0;
    bottom: 0;
    left: 0.3rem;
    right: auto;
    width: 1px;
    height: auto;
    background: linear-gradient(
      180deg,
      transparent,
      var(--mineral) 8%,
      var(--mineral) 92%,
      transparent
    );
  }

  .system__stage {
    padding: 0 0 2rem 1.5rem;
  }

  .system__stage::before {
    left: -0.95rem;
    top: 0.35rem;
  }

  .system__desc {
    max-width: none;
  }

  .perspective__shape {
    opacity: 0.55;
    right: -30%;
    width: min(90vw, 28rem);
  }

  .footer__cols {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  body {
    padding: 0;
  }

  .hero,
  .statement,
  .principles,
  .core-section,
  .system,
  .studies,
  .perspective,
  .final-cta,
  .footer {
    padding-left: 1.35rem;
    padding-right: 1.35rem;
  }

  .nav {
    padding-left: 1.35rem;
    padding-right: 1.35rem;
  }

  .nav__drawer {
    right: 1.35rem;
    left: 1.35rem;
  }

  .principle__arrow {
    font-size: 1.15rem;
  }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}