/* ═══════════════════════════════════════════════════════════════
   Frontier AI Weekly — Landing Page
   ═══════════════════════════════════════════════════════════════ */

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

:root {
  --bg: #08080d;
  --bg-warm: #0c0c14;
  --surface: rgba(255,255,255,0.03);
  --surface-hi: rgba(255,255,255,0.055);
  --border: rgba(255,255,255,0.06);
  --border-hi: rgba(255,255,255,0.1);
  --text: #eaeaf0;
  --text-sec: #b4b4c4;
  --text-muted: #7c7c8a;
  --dim: #505060;
  --violet: #8b5cf6;
  --violet-dim: rgba(139,92,246,0.12);
  --violet-glow: rgba(139,92,246,0.4);
  --blue: #3b82f6;
  --blue-dim: rgba(59,130,246,0.1);
  --amber: #f59e0b;
  --amber-dim: rgba(245,158,11,0.12);
  --green: #17b26a;
  --coral: #f87171;
  --font: 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-display: 'Syne',var(--font);
  --mono: 'JetBrains Mono','SF Mono','Fira Code',monospace;
  --ease: cubic-bezier(0.16,1,0.3,1);
  --ease-spring: cubic-bezier(0.34,1.56,0.64,1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 10000;
  pointer-events: none;
  opacity: 0.03;
  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='0.9' 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: 256px 256px;
}

.reveal { opacity: 0; transform: translateY(28px); }

/* ── Hero ───────────────────────────────────────────── */
.hero {
  min-height: 100dvh;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(48px + env(safe-area-inset-top,0px)) 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero__neural-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero__neural-bg .bg-grid {
  position: absolute;
  inset: -20%;
  background-image:
    linear-gradient(rgba(139,92,246,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,92,246,0.035) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 70% 65% at 50% 40%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 65% at 50% 40%, black 0%, transparent 70%);
  animation: grid-drift 30s ease-in-out infinite alternate;
}

@keyframes grid-drift {
  0% { transform: translate(0,0) rotate(0deg); }
  100% { transform: translate(-1.5%,0.8%) rotate(0.4deg); }
}

.hero__neural-bg .bg-glow-1 {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  top: 15%; right: -5%;
  background: radial-gradient(circle, rgba(139,92,246,0.18) 0%, transparent 60%);
  filter: blur(60px);
  animation: glow-float-1 14s ease-in-out infinite alternate;
}

.hero__neural-bg .bg-glow-2 {
  position: absolute;
  width: 500px; height: 500px;
  border-radius: 50%;
  bottom: 10%; left: -8%;
  background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 60%);
  filter: blur(50px);
  animation: glow-float-2 18s ease-in-out infinite alternate;
}

@keyframes glow-float-1 {
  0% { transform: translate(0,0) scale(1); }
  100% { transform: translate(-30px,20px) scale(1.1); }
}
@keyframes glow-float-2 {
  0% { transform: translate(0,0) scale(1); }
  100% { transform: translate(25px,-15px) scale(1.08); }
}

#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.hero > *:not(.hero__neural-bg):not(#heroCanvas) {
  position: relative;
  z-index: 2;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--violet);
  background: var(--violet-dim);
  border: 1px solid rgba(139,92,246,0.25);
  padding: 0.45rem 1rem 0.45rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 2rem;
}

.hero__badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px rgba(23,178,106,0.5);
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 11vw, 6.2rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 0.95;
  margin-bottom: 1.5rem;
  max-width: 820px;
}

.hero__title-main {
  display: block;
  background: linear-gradient(135deg, #fff 0%, #ddd6fe 48%, #8b5cf6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 32px rgba(139,92,246,0.2));
}

.hero__title-accent {
  display: block;
  font-size: 0.55em;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #3b82f6 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: accent-shift 8s ease-in-out infinite;
  margin-top: 0.15em;
}

@keyframes accent-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero__tagline {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--text-sec);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 2.2rem;
}

.hero__tagline strong { color: var(--text); font-weight: 600; }

.hero__signup {
  width: 100%;
  max-width: 460px;
  margin-bottom: 1.5rem;
}

.hero__form {
  display: flex;
  gap: 0.4rem;
  background: var(--surface-hi);
  border: 1px solid var(--border-hi);
  border-radius: 14px;
  padding: 0.35rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.hero__form:focus-within {
  border-color: rgba(139,92,246,0.35);
  box-shadow: 0 0 0 4px rgba(139,92,246,0.08), 0 4px 24px rgba(0,0,0,0.3);
}

.hero__input {
  flex: 1;
  min-height: 48px;
  padding: 0 1rem;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 0.92rem;
  font-family: var(--font);
  outline: none;
}

.hero__input::placeholder { color: var(--dim); }

.hero__submit {
  min-height: 48px;
  padding: 0 1.6rem;
  background: linear-gradient(135deg, var(--violet) 0%, var(--blue) 100%);
  color: #fff;
  font-size: 0.84rem;
  font-weight: 700;
  font-family: var(--font);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 2px 16px rgba(139,92,246,0.3);
}

.hero__submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(139,92,246,0.4);
}

.hero__submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.hero__msg { font-size: 0.8rem; margin-top: 0.5rem; text-align: left; padding: 0 0.35rem; }
.hero__msg--ok { color: var(--green); }
.hero__msg--err { color: var(--coral); }

.hero__or {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 1rem;
}

.hero__actions {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 46px;
  border-radius: 10px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  font-family: var(--font);
  transition: transform 0.22s var(--ease-spring), box-shadow 0.22s ease, border-color 0.22s ease, color 0.22s ease;
}

.btn--primary {
  padding: 0.75rem 1.6rem;
  background: var(--surface-hi);
  border: 1px solid var(--border-hi);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 600;
  backdrop-filter: blur(8px);
}

.btn--primary:hover {
  border-color: var(--violet);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  color: var(--violet);
}

.btn--ghost {
  padding: 0.75rem 1.2rem;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.btn--ghost:hover { color: var(--violet); }

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.48rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  animation: scroll-drift 3s ease-in-out infinite;
}

@keyframes scroll-drift {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.25; }
  50% { transform: translateX(-50%) translateY(8px); opacity: 0.55; }
}

/* ── Section shell ──────────────────────────────────── */
.s {
  max-width: 1080px;
  margin: 0 auto;
  padding: 6rem 2rem;
  position: relative;
}

.s__tag {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 1.2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--violet-dim);
  padding: 0.35rem 0.9rem;
  border-radius: 100px;
  border: 1px solid rgba(139,92,246,0.12);
}

.s__h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
  color: var(--text);
}

.s__h2 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--violet), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.s__body {
  font-size: clamp(0.92rem, 1.3vw, 1.06rem);
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 600px;
}

/* ── What You Get ───────────────────────────────────── */
.concept {
  max-width: 1080px;
  margin: 0 auto;
  padding: 6rem 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 768px) {
  .concept { grid-template-columns: 1.35fr 0.65fr; gap: 4rem; align-items: start; }
}

.concept__quote {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.65;
  color: var(--blue);
  border-left: 2px solid var(--violet);
  padding: 1rem 0 1rem 1.5rem;
}

/* ── How It Works ───────────────────────────────────── */
.steps-wrap {
  background: var(--bg-warm);
  padding: 6rem 0;
  position: relative;
  overflow: hidden;
}

.steps-wrap::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(139,92,246,0.15), transparent);
}

.steps-wrap::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59,130,246,0.12), transparent);
}

.steps-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
}

.steps-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-top: 2.5rem;
  position: relative;
}

.step {
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 1.6rem 1.3rem;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease-spring), box-shadow 0.35s ease, border-color 0.3s ease;
}

.step:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.35);
}

.step::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  border-radius: 14px 14px 0 0;
}

.step:nth-child(1)::before { background: linear-gradient(90deg, var(--violet), var(--blue)); }
.step:nth-child(2)::before { background: linear-gradient(90deg, var(--blue), #06b6d4); }
.step:nth-child(3)::before { background: linear-gradient(90deg, #06b6d4, var(--green)); }

.step:nth-child(1):hover { border-color: rgba(139,92,246,0.25); }
.step:nth-child(2):hover { border-color: rgba(59,130,246,0.25); }
.step:nth-child(3):hover { border-color: rgba(23,178,106,0.25); }

.step__num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--violet), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.step__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.step__desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Topics ─────────────────────────────────────────── */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.topic {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.3rem 1.2rem;
  background: var(--surface);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease, border-color 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.topic:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.topic__icon {
  width: 36px; height: 36px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.3rem;
}

.topic__icon svg { width: 20px; height: 20px; }

.topic--models .topic__icon { background: var(--violet-dim); }
.topic--models:hover { border-color: rgba(139,92,246,0.25); }
.topic--safety .topic__icon { background: rgba(245,158,11,0.12); }
.topic--safety:hover { border-color: rgba(245,158,11,0.25); }
.topic--policy .topic__icon { background: var(--blue-dim); }
.topic--policy:hover { border-color: rgba(59,130,246,0.25); }
.topic--hardware .topic__icon { background: rgba(6,182,212,0.1); }
.topic--hardware:hover { border-color: rgba(6,182,212,0.25); }
.topic--oss .topic__icon { background: rgba(23,178,106,0.1); }
.topic--oss:hover { border-color: rgba(23,178,106,0.25); }
.topic--tooling .topic__icon { background: rgba(248,113,113,0.1); }
.topic--tooling:hover { border-color: rgba(248,113,113,0.25); }

.topic__name {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
}

.topic__desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ── CTA Section ────────────────────────────────────── */
.cta-section {
  text-align: center;
  padding: 6rem 2rem calc(4rem + env(safe-area-inset-bottom,0px));
  position: relative;
  overflow: hidden;
}

.cta-section__glow {
  position: absolute;
  top: 50%; left: 50%;
  width: 650px; height: 650px;
  transform: translate(-50%,-50%);
  background: radial-gradient(circle, rgba(139,92,246,0.08) 0%, rgba(59,130,246,0.04) 35%, transparent 60%);
  pointer-events: none;
}

.cta-section__card {
  max-width: 480px;
  margin: 2rem auto 0;
  background: var(--surface-hi);
  border: 1px solid var(--border-hi);
  border-radius: 18px;
  padding: 2.2rem;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.cta-section__card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--violet), var(--blue), transparent);
  opacity: 0.6;
}

.cta__form { display: flex; gap: 0.4rem; }

.cta__input {
  flex: 1;
  min-height: 48px;
  padding: 0 1rem;
  background: rgba(8,8,13,0.6);
  border: 1px solid var(--border-hi);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.92rem;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.cta__input::placeholder { color: var(--dim); }
.cta__input:focus { border-color: rgba(139,92,246,0.4); box-shadow: 0 0 0 3px rgba(139,92,246,0.08); }

.cta__submit {
  min-height: 48px;
  padding: 0 1.5rem;
  background: linear-gradient(135deg, var(--violet) 0%, var(--blue) 100%);
  color: #fff;
  font-size: 0.84rem;
  font-weight: 700;
  font-family: var(--font);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s ease;
  box-shadow: 0 2px 16px rgba(139,92,246,0.3);
}

.cta__submit:hover { transform: translateY(-1px); box-shadow: 0 6px 28px rgba(139,92,246,0.4); }
.cta__submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.cta__msg { font-size: 0.8rem; margin-top: 0.6rem; }
.cta__msg--ok { color: var(--green); }
.cta__msg--err { color: var(--coral); }

/* ── Footer ─────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem calc(2.5rem + env(safe-area-inset-bottom,0px));
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}

.footer__brand {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
}

.footer__pulse {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 10px var(--violet-glow);
  margin-right: 0.5rem;
  animation: pulse-dot 2.8s ease-in-out infinite;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.footer__link {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
  text-decoration: none;
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: color 0.2s ease;
}

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

.footer__tag {
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 900px) {
  .steps-row { grid-template-columns: 1fr 1fr; }
  .topics-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .steps-row { grid-template-columns: 1fr; gap: 0.8rem; }
  .topics-grid { grid-template-columns: 1fr; gap: 0.8rem; }
  .hero__form { flex-direction: column; padding: 0.5rem; }
  .hero__input { min-height: 48px; }
  .hero__submit { min-height: 48px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .s { padding: 4rem 1.5rem; }
  .concept { padding: 4rem 1.5rem; }
  .steps-wrap { padding: 4rem 0; }
  .steps-inner { padding: 0 1.5rem; }
  .cta__form { flex-direction: column; }
  .cta-section { padding: 4rem 1.5rem calc(3rem + env(safe-area-inset-bottom,0px)); }
}