/* ── Spokn Landing Page — style.css ─────────────────────────────────────────
   Mobile-first responsive stylesheet.
   Design tokens:
     Background:       #FFFFFF
     Text:             #1a1a2e
     Accent:           #5884FC
     Accent hover:     #4070E8
     Secondary text:   #6b7280
     Alt section bg:   #f8f9fc
     Max width:        1120px
     Card radius:      16px
     Button radius:    28px
   ──────────────────────────────────────────────────────────────────────────── */

/* ── Reset & base ────────────────────────────────────────────────────────── */

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

:root {
  --color-bg:         #ffffff;
  --color-bg-alt:     #f8f9fc;
  --color-text:       #1a1a2e;
  --color-secondary:  #6b7280;
  --color-accent:     #5884FC;
  --color-accent-h:   #4070E8;
  --color-border:     #e5e7eb;
  --font:             -apple-system, BlinkMacSystemFont, 'SF Pro Display', system-ui, sans-serif;
  --max-w:            1120px;
  --r-card:           16px;
  --r-btn:            28px;
  --section-py:       80px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-h);
}

/* ── Skip link ──────────────────────────────────────────────────────────── */

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--r-btn);
  transition: top 0.2s;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}

/* ── Focus styles ───────────────────────────────────────────────────────── */

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.btn:focus-visible {
  outline-offset: 4px;
  border-radius: var(--r-btn);
}

details.faq-item summary:focus-visible {
  outline-offset: -2px;
  border-radius: var(--r-card);
}

/* ── Layout helpers ──────────────────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: var(--section-py);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section__subtitle {
  font-size: 1.0625rem;
  color: var(--color-secondary);
  max-width: 560px;
}

.section__header {
  text-align: center;
  margin-bottom: 56px;
}

.section__header .section__subtitle {
  margin-inline: auto;
}

/* ── Animations ──────────────────────────────────────────────────────────── */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes nucleusPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%       { transform: scale(1.06); opacity: 0.88; }
}

.animate-fade-in {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in:nth-child(1) { animation-delay: 0.0s; }
.animate-fade-in:nth-child(2) { animation-delay: 0.08s; }
.animate-fade-in:nth-child(3) { animation-delay: 0.16s; }
.animate-fade-in:nth-child(4) { animation-delay: 0.24s; }
.animate-fade-in:nth-child(5) { animation-delay: 0.32s; }
.animate-fade-in:nth-child(6) { animation-delay: 0.40s; }

/* ── Navigation ──────────────────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.6);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.nav__logo img {
  width: 28px;
  height: 28px;
}

.nav__cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
  padding: 6px 18px;
  border-radius: var(--r-btn);
  transition: background 0.2s, color 0.2s;
}

.nav__cta:hover {
  background: var(--color-accent);
  color: #fff;
}

/* ── Hero ────────────────────────────────────────────────────────────────── */

.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 80px; /* nav offset */
  background: var(--color-bg);
  overflow: hidden;
  position: relative;
}

/* Faint grid decoration */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(88, 132, 252, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 132, 252, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 48px;
  padding-block: 64px 80px;
}

.hero__orb-wrap {
  position: relative;
  width: 280px;
  height: 280px;
  flex-shrink: 0;
}

#orb {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  cursor: pointer;
}

.hero__text {
  max-width: 640px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 20px;
  background: rgba(88, 132, 252, 0.08);
  padding: 5px 14px;
  border-radius: 100px;
  border: 1px solid rgba(88, 132, 252, 0.18);
}

.hero__title {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--color-text) 0%, #2d4ab0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1.0625rem, 2.5vw, 1.3125rem);
  color: var(--color-secondary);
  margin-bottom: 36px;
  line-height: 1.55;
}

.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--r-btn);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, #4a76f5 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(88, 132, 252, 0.38), 0 1px 3px rgba(0,0,0,0.12);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-accent-h) 0%, #3a66e5 100%);
  box-shadow: 0 6px 28px rgba(88, 132, 252, 0.48), 0 2px 6px rgba(0,0,0,0.14);
  transform: translateY(-1px);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--color-secondary);
  border: 1.5px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

.btn--sm {
  padding: 10px 22px;
  font-size: 0.9375rem;
}

/* ── Features grid ───────────────────────────────────────────────────────── */

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  list-style: none;
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--r-card);
  padding: 28px;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(88, 132, 252, 0.12);
  border-color: rgba(88, 132, 252, 0.3);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(88, 132, 252, 0.10);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  flex-shrink: 0;
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.feature-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-card__desc {
  font-size: 0.9375rem;
  color: var(--color-secondary);
  line-height: 1.6;
}

/* ── How it works ────────────────────────────────────────────────────────── */

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
}

.step {
  display: flex;
  gap: 24px;
  padding: 32px 0;
  position: relative;
}

.step:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 23px;
  top: 80px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, rgba(88,132,252,0.25), rgba(88,132,252,0.05));
}

.step__number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), #4a76f5);
  color: #fff;
  font-size: 1.0625rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(88, 132, 252, 0.35);
  position: relative;
  z-index: 1;
}

.step__content {
  padding-top: 8px;
}

.step__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.step__desc {
  font-size: 0.9375rem;
  color: var(--color-secondary);
  line-height: 1.6;
}

/* ── Privacy section ─────────────────────────────────────────────────────── */

.privacy-card {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  border-radius: 24px;
  padding: 48px 40px;
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.privacy-card__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(88, 132, 252, 0.9);
  margin-bottom: 16px;
}

.privacy-card__title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 14px;
}

.privacy-card__subtitle {
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
}

.privacy-points {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  list-style: none;
}

.privacy-points li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.55;
}

.privacy-points li::before {
  content: '';
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(88, 132, 252, 0.22);
  border: 1.5px solid rgba(88, 132, 252, 0.5);
  flex-shrink: 0;
  margin-top: 1px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%235884FC'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
}

/* ── FAQ ─────────────────────────────────────────────────────────────────── */

.faq__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 720px;
  margin-inline: auto;
}

details.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--r-card);
  background: var(--color-bg);
  overflow: hidden;
  transition: border-color 0.2s;
}

details.faq-item[open] {
  border-color: rgba(88, 132, 252, 0.35);
}

details.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  user-select: none;
  color: var(--color-text);
}

details.faq-item summary::-webkit-details-marker {
  display: none;
}

details.faq-item summary::after {
  content: '';
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  transition: transform 0.25s ease;
}

details.faq-item[open] summary::after {
  transform: rotate(180deg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235884FC' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
}

details.faq-item[open] summary {
  color: var(--color-accent);
}

.faq-item__body {
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--color-secondary);
  line-height: 1.7;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */

.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.55);
  padding-block: 48px;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: center;
  text-align: center;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
}

.footer__logo img {
  width: 28px;
  height: 28px;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  list-style: none;
}

.footer__links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.45);
  transition: color 0.2s;
}

.footer__links a:hover {
  color: rgba(255, 255, 255, 0.9);
}

.footer__copy {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.3);
}

/* ── Responsive: 640px (tablet/large phone) ──────────────────────────────── */

@media (min-width: 640px) {
  .hero__inner {
    flex-direction: row;
    text-align: left;
    align-items: center;
    gap: 64px;
  }

  .hero__eyebrow {
    margin-bottom: 20px;
  }

  .hero__cta-group {
    justify-content: flex-start;
  }

  .section__header .section__subtitle {
    margin-inline: auto;
  }

  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .privacy-card {
    flex-direction: row;
    align-items: flex-start;
    gap: 48px;
  }

  .privacy-card__content {
    flex: 1;
  }

  .privacy-points {
    flex: 1;
    grid-template-columns: 1fr;
  }

  .steps {
    max-width: 540px;
    margin-inline: auto;
  }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
    align-items: center;
  }
}

/* ── Responsive: 1024px (desktop) ────────────────────────────────────────── */

@media (min-width: 1024px) {
  :root {
    --section-py: 112px;
  }

  .hero__inner {
    gap: 80px;
  }

  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .steps {
    max-width: none;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
  }

  .step {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
    padding: 0;
  }

  .step:not(:last-child)::after {
    display: none;
  }

  .step__content {
    padding-top: 0;
  }
}

/* ── Reduced motion ──────────────────────────────────────────────────────── */

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

  html {
    scroll-behavior: auto;
  }
}