/* =========================================================
   QUANTUM EARTH EXCHANGE — V6 RADICAL
   ========================================================= */

/* --- DESIGN TOKENS --- */
:root {
  /* Fonts */
  --font-body: 'Space Grotesk', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;

  /* Type scale — fluid */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3.5rem, 0.5rem + 10vw, 12rem);

  /* 4px spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Colours — VIVID */
  --black: #0A0A0A;
  --lime: #BEFF00;
  --coral: #FF4F6F;
  --violet: #6B2FFA;
  --cyan: #00E5FF;
  --amber: #FFB800;
  --white: #FFFFFF;

  /* Semantic overrides */
  --color-bg: var(--black);
  --color-text: var(--white);

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- GLOBAL --- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 0;
}

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-weight: 400;
  overflow-x: hidden;
}

::selection {
  background: var(--lime);
  color: var(--black);
}

/* --- GRAIN OVERLAY --- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition:
    transform var(--transition-interactive),
    box-shadow var(--transition-interactive),
    background var(--transition-interactive);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(190, 255, 0, 0.3);
}
.btn:active {
  transform: translateY(0);
}

.btn--lime {
  background: var(--lime);
  color: var(--black);
}

.btn--black {
  background: var(--black);
  color: var(--lime);
}
.btn--black:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* =========================================================
   STICKY Q NAV
   ========================================================= */
.q-nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  padding: var(--space-4) var(--space-5);
}

.q-nav__logo {
  display: block;
  width: 40px;
  height: 40px;
  color: var(--white);
  opacity: 0.7;
  transition: opacity 0.2s ease;
}

.q-nav__logo:hover {
  opacity: 1;
}

.q-nav__logo svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* =========================================================
   SECTION 1: HERO
   ========================================================= */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--black);
  overflow: hidden;
}

/* Animated gradient mesh — CSS only */
@property --g1-x {
  syntax: '<percentage>';
  initial-value: 20%;
  inherits: false;
}
@property --g1-y {
  syntax: '<percentage>';
  initial-value: 30%;
  inherits: false;
}
@property --g2-x {
  syntax: '<percentage>';
  initial-value: 70%;
  inherits: false;
}
@property --g2-y {
  syntax: '<percentage>';
  initial-value: 60%;
  inherits: false;
}
@property --g3-x {
  syntax: '<percentage>';
  initial-value: 50%;
  inherits: false;
}
@property --g3-y {
  syntax: '<percentage>';
  initial-value: 20%;
  inherits: false;
}

.hero__gradient-mesh {
  position: absolute;
  inset: -20%;
  z-index: 0;
  opacity: 0.5;
  background:
    radial-gradient(ellipse 60% 50% at var(--g1-x) var(--g1-y), var(--violet), transparent 70%),
    radial-gradient(ellipse 50% 60% at var(--g2-x) var(--g2-y), var(--coral), transparent 70%),
    radial-gradient(ellipse 55% 45% at var(--g3-x) var(--g3-y), var(--cyan), transparent 70%);
  animation: meshMove 12s ease-in-out infinite alternate;
  will-change: --g1-x, --g1-y, --g2-x, --g2-y, --g3-x, --g3-y;
}

@keyframes meshMove {
  0% {
    --g1-x: 20%;
    --g1-y: 30%;
    --g2-x: 70%;
    --g2-y: 60%;
    --g3-x: 50%;
    --g3-y: 20%;
  }
  33% {
    --g1-x: 60%;
    --g1-y: 70%;
    --g2-x: 30%;
    --g2-y: 20%;
    --g3-x: 80%;
    --g3-y: 50%;
  }
  66% {
    --g1-x: 40%;
    --g1-y: 50%;
    --g2-x: 80%;
    --g2-y: 40%;
    --g3-x: 20%;
    --g3-y: 70%;
  }
  100% {
    --g1-x: 75%;
    --g1-y: 25%;
    --g2-x: 25%;
    --g2-y: 75%;
    --g3-x: 60%;
    --g3-y: 40%;
  }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-8);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0;
}

.hero__wordmark {
  width: min(700px, 85vw);
  margin-bottom: -2rem;
}

.hero__wordmark svg {
  width: 100%;
  height: auto;
  fill: var(--color-text);
  display: block;
  margin-bottom: -15%;
}

.hero__earth {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 0.5rem + 3vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--white);
  margin-top: 0;
  margin-bottom: var(--space-8);
}

/* --- MARQUEE --- */
.marquee {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 2;
  overflow: hidden;
  background: var(--lime);
  padding: var(--space-3) 0;
}

.marquee__track {
  display: flex;
  width: max-content;
  animation: marqueeScroll 20s linear infinite;
}

.marquee__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--black);
  white-space: nowrap;
  padding-right: 0;
}

@keyframes marqueeScroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* =========================================================
   SECTION 2: IMPACT STRIP
   ========================================================= */
.impact {
  background: #cc5500;
  padding: clamp(var(--space-10), 5vw, var(--space-16)) clamp(var(--space-4), 5vw, var(--space-12));
}

.impact__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.impact__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.impact__number {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--white);
  line-height: 1;
}

.impact__label {
  font-size: var(--text-sm);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.85);
  max-width: 20ch;
  margin: 0 auto;
  line-height: 1.4;
}

/* =========================================================
   SECTION 3: WHAT WE DO — SPLIT SCREEN
   ========================================================= */
.whatwedo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100dvh;
}

.whatwedo__left {
  background: var(--violet);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(var(--space-8), 6vw, var(--space-16));
}

.whatwedo__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
}

.whatwedo__heading--outline {
  color: transparent;
  -webkit-text-stroke: 2px var(--white);
  text-stroke: 2px var(--white);
}

.whatwedo__right {
  background: var(--black);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(var(--space-8), 6vw, var(--space-16));
}

.capabilities {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  width: 100%;
  max-width: 500px;
}

.capability {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition:
    border-color var(--transition-interactive),
    background var(--transition-interactive),
    transform var(--transition-interactive);
  cursor: default;
  opacity: 0;
  transform: translateY(20px);
}

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

.capability--lime { border-color: var(--lime); }
.capability--lime:hover { background: rgba(190, 255, 0, 0.08); }
.capability--coral { border-color: var(--coral); }
.capability--coral:hover { background: rgba(255, 79, 111, 0.08); }
.capability--cyan { border-color: var(--cyan); }
.capability--cyan:hover { background: rgba(0, 229, 255, 0.08); }
.capability--amber { border-color: var(--amber); }
.capability--amber:hover { background: rgba(255, 184, 0, 0.08); }
.capability--violet { border-color: var(--violet); }
.capability--violet:hover { background: rgba(107, 47, 250, 0.08); }

.capability__name {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-1);
}

.capability__desc {
  display: block;
  font-size: var(--text-xs);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.4;
}

/* =========================================================
   SECTION 4: MANIFESTO
   ========================================================= */
.manifesto {
  background: var(--black);
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(var(--space-16), 10vw, var(--space-32)) clamp(var(--space-4), 5vw, var(--space-12));
}

.manifesto__container {
  max-width: 1000px;
}

.manifesto__line {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-6);
  opacity: 0;
  transform: translateY(40px);
  max-width: 100%;
}

.manifesto__line--lime { color: var(--lime); }
.manifesto__line--coral { color: var(--coral); }
.manifesto__line--cyan { color: var(--cyan); }
.manifesto__line--amber { color: var(--amber); }
.manifesto__line--violet { color: var(--violet); }
.manifesto__line--white { color: var(--white); }

/* =========================================================
   SECTION 5: THE EXCHANGE — CARDS
   ========================================================= */
.exchange {
  background: var(--black);
  padding: clamp(var(--space-16), 8vw, var(--space-24)) clamp(var(--space-4), 5vw, var(--space-12));
  overflow: hidden;
}

.exchange__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--cyan);
  text-align: center;
  margin-bottom: clamp(var(--space-8), 5vw, var(--space-16));
  letter-spacing: -0.02em;
}

.exchange__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

.exchange__card {
  position: relative;
  padding: clamp(var(--space-8), 3vw, var(--space-12));
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
}

/* Coloured gradient bleed */
.exchange__card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.12;
  border-radius: inherit;
  z-index: 0;
  transition: opacity 0.4s ease;
}
.exchange__card:hover::before {
  opacity: 0.2;
}

.exchange__card--amber::before {
  background: radial-gradient(circle at 30% 80%, var(--amber), transparent 70%);
}
.exchange__card--lime::before {
  background: radial-gradient(circle at 30% 80%, var(--lime), transparent 70%);
}
.exchange__card--coral::before {
  background: radial-gradient(circle at 30% 80%, var(--coral), transparent 70%);
}

.exchange__card-label {
  position: relative;
  z-index: 1;
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 300;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
  opacity: 0.5;
}

.exchange__card-title {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
  color: var(--white);
}

.exchange__card--amber .exchange__card-title { color: var(--amber); }
.exchange__card--lime .exchange__card-title { color: var(--lime); }
.exchange__card--coral .exchange__card-title { color: var(--coral); }

.exchange__card-desc {
  position: relative;
  z-index: 1;
  font-size: var(--text-base);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.6;
}

/* =========================================================
   SECTION 6: JOIN / SIGNUP
   ========================================================= */
.join {
  background: var(--lime);
  padding: clamp(var(--space-16), 10vw, var(--space-32)) clamp(var(--space-4), 5vw, var(--space-12));
}

.join__content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.join__heading {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  color: var(--black);
  line-height: 0.9;
  margin-bottom: var(--space-4);
}

.join__sub {
  font-size: var(--text-lg);
  font-weight: 300;
  color: rgba(10, 10, 10, 0.7);
  margin-bottom: var(--space-10);
}

/* Multi-step form */
.join__form {
  max-width: 520px;
  margin: 0 auto;
  position: relative;
  min-height: 140px;
}

.join__step {
  display: none;
  animation: stepIn 0.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.join__step--active {
  display: block;
}

@keyframes stepIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.join__form-row {
  display: flex;
  gap: var(--space-3);
}

.join__input {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  border: 2px solid var(--black);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--black);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  outline: none;
  transition: border-color 0.2s ease;
}

.join__input--full {
  width: 100%;
  flex: none;
}

.join__input::placeholder {
  color: rgba(10, 10, 10, 0.4);
}

.join__input:focus {
  border-color: var(--violet);
}

/* Step 2 layout */
.join__step2-fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  align-items: center;
}

.join__interest-label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(10, 10, 10, 0.6);
  margin: 0;
}

.join__interest-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.join__pill {
  cursor: pointer;
}

.join__pill input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.join__pill span {
  display: block;
  padding: var(--space-3) var(--space-6);
  border: 2px solid var(--black);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--black);
  background: transparent;
  transition: all 0.2s ease;
  user-select: none;
}

.join__pill:hover span {
  background: rgba(10, 10, 10, 0.06);
}

.join__pill input:checked + span {
  background: var(--black);
  color: var(--lime);
  border-color: var(--black);
}

.join__submit-final {
  width: 100%;
  max-width: 300px;
  margin-top: var(--space-2);
}

/* Step 3: success */
.join__success-msg {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  line-height: 0.9;
  color: var(--black);
  margin-bottom: var(--space-3);
}

.join__success-sub {
  font-size: var(--text-lg);
  font-weight: 300;
  color: rgba(10, 10, 10, 0.6);
}

/* =========================================================
   SECTION 7: FOOTER
   ========================================================= */
.footer {
  background: var(--black);
  padding: var(--space-5) clamp(var(--space-4), 5vw, var(--space-12));
}

.footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__wordmark {
  width: min(140px, 30vw);
}

.footer__wordmark svg {
  width: 100%;
  height: auto;
  fill: var(--white);
  display: block;
}

.footer__nav {
  display: flex;
  gap: var(--space-6);
}

.footer__nav a {
  font-size: var(--text-xs);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: color var(--transition-interactive);
}

.footer__nav a:hover {
  color: var(--lime);
}

.footer__copy {
  font-size: var(--text-xs);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.3);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

/* Tablet */
@media (max-width: 900px) {
  .whatwedo {
    grid-template-columns: 1fr;
  }
  .whatwedo__left {
    min-height: 50dvh;
    padding: var(--space-16) var(--space-8);
  }
  .whatwedo__right {
    padding: var(--space-12) var(--space-8);
  }
  .capabilities {
    max-width: 100%;
  }
  .exchange__cards {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .impact__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* Mobile */
@media (max-width: 600px) {
  .hero__wordmark {
    width: min(700px, 85vw);
    margin-bottom: 0;
  }
  .hero__wordmark svg {
    margin-bottom: -8%;
  }
  .hero__earth {
    letter-spacing: 0.12em;
  }
  .capabilities {
    grid-template-columns: 1fr;
  }
  .join__form-row {
    flex-direction: column;
  }
  .join__form-row .join__input,
  .join__form-row .btn {
    width: 100%;
  }
  .join__pill span {
    padding: var(--space-3) var(--space-5);
    font-size: 0.7rem;
  }
  .join__submit-final {
    max-width: 100%;
  }
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
  .footer__nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  .manifesto__line {
    font-size: var(--text-xl);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .hero__gradient-mesh {
    animation: none;
  }
  .marquee__track {
    animation: none;
  }
  .capability,
  .exchange__card,
  .manifesto__line {
    opacity: 1;
    transform: none;
  }
}