/* ===================================================
   MIND DECODERS — LANDING PAGE STYLES
   Design: Institutional, restrained, dark teal palette
   =================================================== */

/* ---------- IMPORTS ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---------- DESIGN TOKENS ---------- */
:root {
  /* Brand palette */
  --teal-900: #0e2f33;
  --teal-800: #153e43;
  --teal-700: #1b4d52;
  --teal-600: #236168;
  --teal-500: #2c7a82;
  --teal-400: #3a9aa4;
  --teal-300: #5cb8c2;
  --teal-200: #8fd3da;
  --teal-100: #c5e9ed;
  --teal-50: #e8f5f7;

  /* Neutrals */
  --neutral-950: #0a0c0c;
  --neutral-900: #111414;
  --neutral-800: #1c2020;
  --neutral-700: #2a2f2f;
  --neutral-600: #3d4343;
  --neutral-500: #5a6262;
  --neutral-400: #7d8585;
  --neutral-300: #a5abab;
  --neutral-200: #cdd1d1;
  --neutral-100: #e8eaea;
  --neutral-50: #f4f5f5;
  --white: #ffffff;

  /* Accent */
  --accent-warm: #c8a96e;
  --accent-warm-light: #ddc48f;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --max-width: 1120px;
  --max-width-narrow: 780px;

  /* Transitions */
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* Borders */
  --border-subtle: 1px solid rgba(255, 255, 255, 0.06);
  --border-light: 1px solid rgba(255, 255, 255, 0.1);
}

/* ---------- RESET & BASE ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-weight: 400;
  line-height: 1.7;
  color: var(--neutral-200);
  background-color: var(--neutral-950);
  overflow-x: hidden;
}

::selection {
  background: var(--teal-600);
  color: var(--white);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--teal-300);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--teal-200);
}

/* ---------- LAYOUT UTILITIES ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

/* ---------- SECTION BASE ---------- */
.section {
  padding: var(--space-5xl) 0;
  position: relative;
}

.section+.section {
  border-top: 1px solid rgba(94, 234, 212, 0.25);
}

.section--dark {
  background-color: var(--neutral-950);
}

.section--muted {
  background-color: var(--neutral-900);
}

.section--teal {
  background-color: var(--teal-900);
}

/* ---------- SECTION BACKGROUND IMAGES ---------- */
.section--has-bg {
  position: relative;
  overflow: hidden;
}

.section__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  filter: grayscale(100%) brightness(0.45) contrast(1.1);
  opacity: 0.5;
  z-index: 0;
  transition: opacity 0.8s ease;
}

/* Green/teal tinted backgrounds */
#hero .section__bg,
#why .section__bg,
#inside .section__bg,
#engine .section__bg {
  filter: grayscale(60%) brightness(0.45) contrast(1.1) sepia(40%) hue-rotate(120deg);
}

/* B&W + light-green tinted background for audience section */
#who .section__bg {
  filter: grayscale(70%) brightness(0.45) contrast(1.1) sepia(35%) hue-rotate(120deg);
  background-position: center 30%;
}

/* Green tint for join/participate section */
#participate .section__bg {
  filter: grayscale(60%) brightness(0.45) contrast(1.1) sepia(40%) hue-rotate(120deg);
}

.section--has-bg>.container,
.section--has-bg>.container--narrow {
  position: relative;
  z-index: 1;
}

.section__label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal-400);
  margin-bottom: var(--space-lg);
  display: inline-block;
  position: relative;
  padding-left: 2rem;
}

.section__label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 1.25rem;
  height: 1px;
  background: var(--teal-500);
}

.section__headline {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

.section__copy {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  color: var(--neutral-300);
  max-width: 640px;
}

.section__copy p+p {
  margin-top: var(--space-lg);
}

.section__divider {
  width: 3rem;
  height: 2px;
  background: var(--teal-600);
  margin: var(--space-2xl) 0;
  border: none;
}

/* ---------- SCROLL REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

/* ---------- NAVIGATION ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-lg) 0;
  transition: background var(--transition-base),
    padding var(--transition-base),
    box-shadow var(--transition-base);
}

.nav.scrolled {
  background: rgba(10, 12, 12, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: var(--space-md) 0;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav__logo img {
  height: 55px;
  width: auto;
  transition: height 0.3s ease;
}

.nav.scrolled .nav__logo img {
  height: 48px;
}

.nav__logo-text {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav__cta {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--teal-300);
  letter-spacing: 0.04em;
  padding: 0.6rem 1.4rem;
  border: 1px solid var(--teal-600);
  border-radius: 4px;
  transition: all var(--transition-base);
  cursor: pointer;
  background: transparent;
}

.nav__cta:hover {
  background: var(--teal-700);
  border-color: var(--teal-500);
  color: var(--white);
}

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 6rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(27, 77, 82, 0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(27, 77, 82, 0.08) 0%, transparent 60%);
  pointer-events: none;
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero__headline {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  line-height: 1.12;
  color: var(--white);
  margin-bottom: var(--space-xl);
  letter-spacing: -0.03em;
}

.hero__headline em {
  font-style: normal;
  color: var(--teal-300);
}

.hero__subline {
  font-size: var(--font-size-xl);
  line-height: 1.7;
  color: var(--neutral-300);
  margin-bottom: var(--space-3xl);
  max-width: 600px;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: var(--font-size-sm);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
}

.btn--primary {
  background: var(--teal-700);
  color: var(--white);
  padding: 1rem 2.2rem;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}

.btn--primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.btn--primary:hover {
  background: var(--teal-600);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(27, 77, 82, 0.35);
  color: var(--white);
}

.btn--ghost {
  background: transparent;
  color: var(--neutral-400);
  padding: 0.8rem 0;
  font-weight: 400;
  font-size: var(--font-size-sm);
  letter-spacing: 0.02em;
  border-bottom: 1px solid transparent;
}

.btn--ghost:hover {
  color: var(--neutral-200);
  border-bottom-color: var(--neutral-500);
}

.btn--ghost .arrow {
  display: inline-block;
  margin-left: 0.5rem;
  transition: transform var(--transition-base);
  font-size: 0.75em;
}

.btn--ghost:hover .arrow {
  transform: translateX(3px);
}

/* ---------- WHY SECTION ---------- */
.why__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  margin-top: var(--space-2xl);
}

.why__emphasis {
  font-size: var(--font-size-2xl);
  font-weight: 500;
  color: var(--teal-200);
  line-height: 1.5;
  border-left: 2px solid var(--teal-600);
  padding-left: var(--space-xl);
  margin-top: var(--space-xl);
}

/* ---------- WHAT HAPPENS INSIDE ---------- */
.inside__list {
  list-style: none;
  margin-top: var(--space-2xl);
  display: grid;
  gap: var(--space-md);
}

.inside__list li {
  font-size: var(--font-size-lg);
  color: var(--neutral-200);
  padding: var(--space-lg) var(--space-xl);
  background: rgba(255, 255, 255, 0.02);
  border-left: 2px solid var(--teal-700);
  transition: all var(--transition-base);
  border-radius: 0 4px 4px 0;
}

.inside__list li:hover {
  background: rgba(255, 255, 255, 0.04);
  border-left-color: var(--teal-400);
  transform: translateX(4px);
}

.inside__disclaimer {
  margin-top: var(--space-3xl);
  padding: var(--space-xl) var(--space-2xl);
  background: rgba(27, 77, 82, 0.08);
  border: 1px solid rgba(27, 77, 82, 0.15);
  border-radius: 6px;
}

.inside__disclaimer p {
  font-size: var(--font-size-base);
  color: var(--neutral-400);
  line-height: 1.8;
}

.inside__disclaimer strong {
  color: var(--neutral-200);
  font-weight: 500;
}

/* ---------- COGNITIVE ENGINE ---------- */
.engine__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2xl);
  margin-top: var(--space-3xl);
}

.engine__card {
  padding: var(--space-3xl) var(--space-2xl);
  background: var(--neutral-900);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.engine__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--teal-700), var(--teal-500), var(--teal-700));
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.engine__card:hover {
  border-color: rgba(27, 77, 82, 0.2);
  transform: translateY(-2px);
}

.engine__card:hover::before {
  opacity: 1;
}

.engine__card-number {
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal-500);
  margin-bottom: var(--space-lg);
}

.engine__card-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--white);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.01em;
}

.engine__card-desc {
  font-size: var(--font-size-base);
  color: var(--neutral-400);
  line-height: 1.8;
}

.engine__summary {
  margin-top: var(--space-3xl);
  text-align: center;
}

.engine__summary p {
  font-size: var(--font-size-xl);
  color: var(--neutral-300);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

.engine__summary strong {
  color: var(--teal-200);
  font-weight: 500;
}

/* ---------- WHO IT'S FOR ---------- */
.who__audience {
  list-style: none;
  margin-top: var(--space-2xl);
  display: grid;
  gap: var(--space-sm);
}

.who__audience li {
  font-size: var(--font-size-lg);
  color: var(--neutral-200);
  padding: var(--space-md) 0;
  padding-left: var(--space-xl);
  position: relative;
}

.who__audience li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--teal-500);
}

.who__exclusions {
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: var(--border-subtle);
}

.who__exclusions p {
  font-size: var(--font-size-base);
  color: var(--neutral-500);
  line-height: 1.8;
}

.who__curated {
  margin-top: var(--space-xl);
  font-size: var(--font-size-lg) !important;
  color: var(--teal-300) !important;
  font-weight: 500;
}

/* ---------- PRINCIPLES ---------- */
.principles__list {
  list-style: none;
  margin-top: var(--space-3xl);
  counter-reset: principle;
}

.principles__list li {
  counter-increment: principle;
  font-size: var(--font-size-xl);
  color: var(--neutral-200);
  padding: var(--space-xl) 0;
  border-bottom: var(--border-subtle);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xl);
  transition: color var(--transition-base);
}

.principles__list li:first-child {
  border-top: var(--border-subtle);
}

.principles__list li::before {
  content: counter(principle, decimal-leading-zero);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--teal-500);
  letter-spacing: 0.1em;
  min-width: 2rem;
  padding-top: 0.4rem;
}

.principles__list li:hover {
  color: var(--white);
}

/* ---------- PARTICIPATION ---------- */
.participation__intro {
  margin-bottom: var(--space-3xl);
}

.participation__form-wrapper {
  max-width: 560px;
  margin-top: var(--space-3xl);
}

.form {
  display: grid;
  gap: var(--space-xl);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form__label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--neutral-300);
  letter-spacing: 0.03em;
}

.form__input,
.form__textarea {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--white);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  padding: var(--space-md) var(--space-lg);
  transition: all var(--transition-base);
  outline: none;
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--neutral-600);
}

.form__input:focus,
.form__textarea:focus {
  border-color: var(--teal-500);
  background: rgba(27, 77, 82, 0.06);
  box-shadow: 0 0 0 3px rgba(27, 77, 82, 0.1);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form__submit {
  margin-top: var(--space-md);
  justify-self: start;
}

.form__note {
  font-size: var(--font-size-sm);
  color: var(--neutral-500);
  margin-top: var(--space-md);
  line-height: 1.6;
}

/* Form thank-you state */
.form--submitted {
  display: none;
}

.form-thankyou {
  display: none;
  padding: var(--space-3xl) 0;
}

.form-thankyou.visible {
  display: block;
}

.form-thankyou__message {
  font-size: var(--font-size-xl);
  color: var(--teal-200);
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.form-thankyou__detail {
  font-size: var(--font-size-base);
  color: var(--neutral-400);
  line-height: 1.7;
}

/* ---------- FOOTER ---------- */
.footer {
  padding: var(--space-4xl) 0 var(--space-2xl);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  background: var(--neutral-950);
}

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

.footer__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3xl);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer__brand img {
  height: 48px;
  width: auto;
  opacity: 0.7;
}

.footer__brand-name {
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--neutral-300);
  text-transform: uppercase;
}

.footer__tagline {
  font-size: var(--font-size-sm);
  color: var(--neutral-500);
  max-width: 460px;
  line-height: 1.7;
  margin-top: var(--space-md);
}

.footer__links {
  display: flex;
  gap: var(--space-xl);
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--neutral-500);
  letter-spacing: 0.04em;
  transition: color var(--transition-base);
  font-weight: 500;
}

.footer__link:hover {
  color: var(--neutral-200);
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: var(--border-subtle);
}

.footer__copyright {
  font-size: var(--font-size-xs);
  color: var(--neutral-600);
  letter-spacing: 0.04em;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }

  .section {
    padding: var(--space-4xl) 0;
  }

  .container {
    padding: 0 var(--space-lg);
  }

  .hero {
    min-height: auto;
    padding-top: 8rem;
    padding-bottom: var(--space-4xl);
  }

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

  .engine__grid {
    grid-template-columns: 1fr;
  }

  .footer__top {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .nav__logo-text {
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 1.875rem;
    --font-size-4xl: 1.5rem;
  }

  .hero__brand {
    font-size: var(--font-size-xs);
  }

  .engine__card {
    padding: var(--space-2xl) var(--space-xl);
  }

  .principles__list li {
    font-size: var(--font-size-base);
  }
}

/* ---------- REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }

  * {
    transition-duration: 0.01ms !important;
  }
}