/* =========================================================
   CUBERST — Design tokens
   Base: deep space navy-black (not pure black)
   Signature: cyan→violet gradient, used sparingly
   Voice: terminal / system-boot, technical audience
   ========================================================= */

:root {
  /* Color tokens */
  --bg-base: #0A0E14;
  --bg-surface: #12171F;
  --bg-surface-raised: #171D27;
  --border-subtle: #232B38;
  --border-hover: #34404F;

  --text-primary: #EDF1F7;
  --text-secondary: #8A94A6;
  --text-tertiary: #565F70;

  --accent-cyan: #4CC9F0;
  --accent-violet: #7B2FF7;
  --accent-amber: #F4D35E;
  --accent-green: #3DDC84;
  --accent-red: #F45C5C;

  --gradient-signature: linear-gradient(120deg, var(--accent-cyan) 0%, var(--accent-violet) 100%);

  /* Type tokens */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing / layout */
  --content-max: 1120px;
  --content-narrow: 760px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

.mono { font-family: var(--font-mono); }

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

::selection {
  background: var(--accent-violet);
  color: var(--text-primary);
}

/* focus visibility */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* =========================================================
   Ambient layers
   ========================================================= */

.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.scanline {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 99;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(76, 201, 240, 0.02) 50%,
    transparent 100%
  );
  background-size: 100% 4px;
  opacity: 0.4;
}

.grid-field {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 780px;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(76, 201, 240, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(76, 201, 240, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 20%, black 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 60% 50% at 50% 20%, black 0%, transparent 75%);
}

/* =========================================================
   Topbar
   ========================================================= */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 20, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.topbar-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.logo-mark {
  color: var(--accent-cyan);
  font-size: 1.2rem;
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-amber);
  box-shadow: 0 0 8px var(--accent-amber);
  animation: pulse-dot 2.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.status-text .mono { color: var(--text-primary); }

/* =========================================================
   Hero
   ========================================================= */

.hero {
  position: relative;
  padding: 88px 24px 96px;
  max-width: var(--content-max);
  margin: 0 auto;
}

.hero-inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

/* terminal block */

.terminal-block {
  margin: 0 auto 40px;
  max-width: 480px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: left;
  box-shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  opacity: 0;
  transform: translateY(8px);
  animation: rise-in 0.6s var(--ease-out) 0.1s forwards;
}

@keyframes rise-in {
  to { opacity: 1; transform: translateY(0); }
}

.terminal-chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--bg-surface-raised);
  border-bottom: 1px solid var(--border-subtle);
}

.dot { width: 9px; height: 9px; border-radius: 50%; opacity: 0.85; }
.dot-r { background: var(--accent-red); }
.dot-y { background: var(--accent-amber); }
.dot-g { background: var(--accent-green); }

.terminal-path {
  margin-left: 8px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.terminal-body {
  padding: 14px 16px;
  font-size: 0.85rem;
  min-height: 24px;
}

.term-prompt {
  color: var(--accent-green);
  margin-right: 8px;
}

.term-line {
  color: var(--text-secondary);
}

.term-cursor {
  display: inline-block;
  background: var(--accent-cyan);
  width: 7px;
  height: 14px;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: middle;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* headline */

.hero-headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-headline .line {
  display: block;
  opacity: 0;
}

.line-2 {
  background: var(--gradient-signature);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  opacity: 0;
  animation: fade-up 0.6s var(--ease-out) 1.4s forwards;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* CTA form */

.hero-cta {
  opacity: 0;
  animation: fade-up 0.6s var(--ease-out) 1.6s forwards;
}

.waitlist-form { max-width: 460px; margin: 0 auto; }

.input-wrap {
  display: flex;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 6px;
  transition: border-color 0.2s var(--ease-out);
}

.input-wrap:focus-within {
  border-color: var(--accent-cyan);
}

.email-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 12px 14px;
  font-size: 0.9rem;
  min-width: 0;
}

.email-input::placeholder { color: var(--text-tertiary); }
.email-input:focus { outline: none; }

.submit-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--gradient-signature);
  color: #0A0E14;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.15s var(--ease-out), box-shadow 0.15s var(--ease-out);
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px -8px rgba(76, 201, 240, 0.5);
}

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

.btn-arrow { transition: transform 0.15s var(--ease-out); }
.submit-btn:hover .btn-arrow { transform: translateX(3px); }

.form-hint {
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  transition: color 0.2s var(--ease-out);
}

.form-hint.success { color: var(--accent-green); }
.form-hint.error { color: var(--accent-red); }

/* hero meta row */

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 56px;
  opacity: 0;
  animation: fade-up 0.6s var(--ease-out) 1.8s forwards;
}

.meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.meta-number {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
}

.meta-label {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.meta-divider {
  width: 1px;
  height: 28px;
  background: var(--border-subtle);
}

/* =========================================================
   Section: what is this
   ========================================================= */

.section-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-what {
  padding: 100px 0;
  border-top: 1px solid var(--border-subtle);
  position: relative;
}

.section-eyebrow {
  display: block;
  color: var(--accent-cyan);
  font-size: 0.8rem;
  margin-bottom: 20px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1.35;
  max-width: 680px;
  color: var(--text-primary);
  margin-bottom: 56px;
}

.what-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.what-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.02) inset;
  transition: border-color 0.25s var(--ease-out), transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.what-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px -16px rgba(76, 201, 240, 0.25), 0 1px 0 rgba(255, 255, 255, 0.02) inset;
}

.what-icon {
  display: inline-block;
  color: var(--accent-violet);
  font-size: 0.8rem;
  margin-bottom: 16px;
  opacity: 0.9;
}

.what-card h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.what-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* =========================================================
   Section: signal / quote
   ========================================================= */

.section-signal {
  padding: 80px 0;
  border-top: 1px solid var(--border-subtle);
}

.signal-box {
  max-width: var(--content-narrow);
  margin: 0 auto;
  text-align: center;
  position: relative;
  padding: 40px 20px;
}

.signal-quote-mark {
  display: block;
  font-size: 2.4rem;
  color: var(--accent-cyan);
  opacity: 0.5;
  line-height: 1;
  margin-bottom: 8px;
}

.signal-quote {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 18px;
}

.signal-attrib {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* =========================================================
   Section: final CTA
   ========================================================= */

.section-final {
  padding: 110px 0 120px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.section-final::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(123, 47, 247, 0.12) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.final-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 14px;
  position: relative;
}

.final-sub {
  color: var(--text-secondary);
  margin-bottom: 36px;
  position: relative;
}

.final-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hover);
  color: var(--text-primary);
  padding: 14px 26px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
  transition: border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.final-btn:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-surface-raised);
}

.final-btn .btn-arrow {
  transition: transform 0.2s var(--ease-out);
}

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

/* =========================================================
   Footer
   ========================================================= */

.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 24px 0;
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

.footer-live {
  color: var(--accent-amber);
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 860px) {
  .what-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .hero { padding: 64px 20px 72px; }
  .input-wrap { flex-direction: column; }
  .submit-btn { justify-content: center; }
  .hero-meta { gap: 14px; }
  .meta-divider { display: none; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
  .grid-field { height: 560px; }
}