/* ================================================
   CODEBASE SYSTEMS — Design System
   Inspired by Linear, Vercel, Resend
   ================================================ */

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

:root {
  /* Surfaces */
  --bg:        #09090b;
  --surface:   #111113;
  --elevated:  #18181b;
  --border:    rgba(255,255,255,.06);
  --border-h:  rgba(255,255,255,.1);

  /* Text */
  --text-1:    #fafafa;
  --text-2:    #a1a1aa;
  --text-3:    #52525b;

  /* Accent — restrained blue (from brand) */
  --accent:    #3b82f6;
  --accent-s:  rgba(59,130,246,.12);
  --accent-g:  linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);

  /* Success / Danger */
  --green:     #22c55e;
  --red:       #ef4444;

  /* Layout */
  --w:   1120px;
  --gap: 24px;
  --radius: 12px;
  --radius-sm: 8px;

  /* Font */
  --sans:  'Inter', system-ui, -apple-system, sans-serif;
  --mono:  'JetBrains Mono', 'Fira Code', monospace;

  /* Easing */
  --ease: cubic-bezier(.25,.46,.45,.94);
}

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text-2);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

::selection {
  background: var(--accent);
  color: #fff;
}

/* --- Grain Overlay --- */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px;
}

/* --- Container --- */
.container {
  max-width: var(--w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* --- Section system --- */
.section {
  padding: 120px 0;
  position: relative;
}

.section--border::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(var(--w), calc(100% - var(--gap)*2));
  height: 1px;
  background: var(--border);
}

.section__label {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section__label span {
  color: var(--accent);
  font-weight: 500;
}

.section__title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.15;
  letter-spacing: -.03em;
  max-width: 600px;
  margin-bottom: 56px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  border-radius: 9999px;
  padding: 10px 20px;
  transition: all .2s var(--ease);
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn--filled {
  background: var(--text-1);
  color: var(--bg);
}

.btn--filled:hover {
  background: #d4d4d8;
  transform: translateY(-1px);
}

.btn--ghost {
  border: 1px solid var(--border-h);
  color: var(--text-2);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--text-3);
  color: var(--text-1);
}

.btn--lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn span { transition: transform .2s var(--ease); }
.btn:hover span { transform: translateX(3px); }

/* ================================================
   NAVIGATION
   ================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 var(--gap);
  transition: background .3s, border-color .3s, backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}

.nav--scrolled {
  background: rgba(9,9,11,.8);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom-color: var(--border);
}

.nav__inner {
  max-width: var(--w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav__logo-img {
  height: 30px;
  width: auto;
  /* If logo has white bg, blend it away on dark backgrounds */
  mix-blend-mode: screen;
  filter: brightness(1.1);
}

.nav__wordmark {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-1);
  letter-spacing: -.01em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links a {
  font-size: 14px;
  color: var(--text-3);
  transition: color .2s;
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--text-1);
}

.nav__cta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-1);
  padding: 8px 18px;
  border: 1px solid var(--border-h);
  border-radius: 9999px;
  transition: all .2s var(--ease);
}

.nav__cta:hover {
  border-color: var(--text-3);
  background: var(--surface);
}

.nav__cta-arrow {
  font-size: 14px;
  transition: transform .2s var(--ease);
}

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

.nav__mobile {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
}

.nav__mobile span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text-1);
  position: absolute;
  left: 0;
  transition: all .3s var(--ease);
}

.nav__mobile span:first-child { top: 0; }
.nav__mobile span:last-child { bottom: 0; }

.nav__mobile.is-open span:first-child {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav__mobile.is-open span:last-child {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* ================================================
   HERO
   ================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px var(--gap) 80px;
  text-align: center;
  overflow: hidden;
}

/* Subtle radial glow */
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(59,130,246,.08) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-3);
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 9999px;
  margin-bottom: 32px;
  text-transform: uppercase;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: .4; }
}

.hero__title {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 800;
  color: var(--text-1);
  line-height: 1.05;
  letter-spacing: -.04em;
  margin-bottom: 24px;
}

.hero__sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 40px;
}

.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__visual {
  position: relative;
  z-index: 2;
  margin-top: 64px;
}

.hero__logo-img {
  height: 120px;
  width: auto;
  margin: 0 auto;
  opacity: .6;
  mix-blend-mode: screen;
  filter: brightness(1.1);
  transition: opacity .4s;
}

.hero__logo-img:hover {
  opacity: .65;
}

.hero__fade {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to bottom, transparent, var(--bg));
  z-index: 1;
  pointer-events: none;
}

/* ================================================
   MARQUEE
   ================================================ */
.marquee {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  white-space: nowrap;
  padding: 14px 0;
}

.marquee__track {
  display: inline-flex;
  gap: 24px;
  animation: marquee 30s linear infinite;
}

.marquee__track span {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: .02em;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ================================================
   BENTO GRID (Services)
   ================================================ */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.bento__card {
  background: var(--surface);
  padding: 36px 32px;
  transition: background .3s;
}

.bento__card:hover {
  background: var(--elevated);
}

.bento__card--lg {
  grid-column: span 3;
  padding: 48px 40px;
  background: var(--elevated);
}

.bento__card--lg:hover {
  background: #1e1e22;
}

.bento__card--lg p {
  font-size: 17px;
  max-width: 600px;
}

.bento__card-label {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: 12px;
}

.bento__card p {
  color: var(--text-2);
  line-height: 1.6;
  font-size: 15px;
}

.bento__tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.bento__tags span {
  font-family: var(--mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--accent-s);
  color: var(--accent);
  letter-spacing: .02em;
}

/* ================================================
   CODE DIFF
   ================================================ */
.diff {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: 16px;
}

.diff__panel {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
}

.diff__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.diff__dots {
  display: flex;
  gap: 6px;
}

.diff__dots i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-h);
}

.diff__badge {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  padding: 3px 10px;
  border-radius: 4px;
  text-transform: uppercase;
}

.diff__badge--red  { background: rgba(239,68,68,.12); color: var(--red); }
.diff__badge--green { background: rgba(34,197,94,.12); color: var(--green); }

.diff__code {
  padding: 20px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-2);
  overflow-x: auto;
  tab-size: 2;
}

.diff__sep {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
}

.diff__sep span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--elevated);
  border: 1px solid var(--border);
  color: var(--text-3);
  font-size: 16px;
}

/* Syntax colors */
.t-kw  { color: #c084fc; }
.t-cls { color: #facc15; }
.t-fn  { color: #60a5fa; }
.t-val { color: #f97316; }
.t-str { color: #34d399; }

/* ================================================
   PROCESS / STEPS
   ================================================ */
.steps {
  display: grid;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}

.step:last-child {
  border-bottom: none;
}

.step__num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
  padding-top: 2px;
}

.step__body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 8px;
}

.step__body p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-2);
  max-width: 560px;
}

/* ================================================
   METRICS
   ================================================ */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.metric {
  background: var(--surface);
  padding: 40px 32px;
  text-align: center;
}

.metric__val {
  font-size: 48px;
  font-weight: 800;
  color: var(--text-1);
  letter-spacing: -.04em;
  line-height: 1;
  margin-bottom: 8px;
}

.metric__label {
  font-size: 14px;
  color: var(--text-3);
}

/* ================================================
   REASONS (Why Us)
   ================================================ */
.reasons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
}

.reason {
  padding: 32px 32px 32px 0;
  border-bottom: 1px solid var(--border);
}

.reason:nth-child(even) {
  padding-left: 32px;
  border-left: 1px solid var(--border);
}

.reason:nth-last-child(-n+2) {
  border-bottom: none;
}

.reason h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 8px;
}

.reason p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-2);
}

/* ================================================
   AUDIENCE
   ================================================ */
.audience {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.audience__card {
  background: var(--surface);
  padding: 40px 32px;
  transition: background .3s;
}

.audience__card:hover {
  background: var(--elevated);
}

.audience__card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 12px;
}

.audience__card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-2);
}

/* ================================================
   CTA
   ================================================ */
.cta {
  padding: 120px 0;
}

.cta__inner {
  text-align: center;
  padding: 80px 40px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  position: relative;
  overflow: hidden;
}

/* Subtle glow behind CTA */
.cta__inner::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(59,130,246,.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta__inner h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 12px;
  position: relative;
}

.cta__inner p {
  font-size: 16px;
  color: var(--text-2);
  margin-bottom: 32px;
  position: relative;
}

.cta__inner .btn {
  position: relative;
}

/* ================================================
   FOOTER
   ================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer__logo {
  height: 28px;
  width: auto;
  margin-bottom: 16px;
  opacity: .6;
  mix-blend-mode: screen;
  filter: brightness(1.1);
}

.footer__brand p {
  font-size: 14px;
  color: var(--text-3);
  max-width: 280px;
  line-height: 1.6;
}

.footer__col h4 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-3);
  margin-bottom: 16px;
}

.footer__col a {
  display: block;
  font-size: 14px;
  color: var(--text-2);
  padding: 4px 0;
  transition: color .2s;
}

.footer__col a:hover {
  color: var(--text-1);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-3);
}

.footer__partner {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
}

/* ================================================
   SCROLL ANIMATIONS
   ================================================ */
.anim-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
  transition-delay: var(--d, 0s);
}

.anim-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================
   MOBILE
   ================================================ */
.hide-mobile { display: inline; }

@media (max-width: 1024px) {
  .bento {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento__card--lg {
    grid-column: span 2;
  }
  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer__top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --gap: 20px;
  }

  .section {
    padding: 80px 0;
  }

  .hide-mobile { display: none; }

  /* Nav */
  .nav__links {
    display: none;
    position: fixed;
    inset: 64px 0 0 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    background: rgba(9,9,11,.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    z-index: 90;
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__links a {
    font-size: 18px;
    color: var(--text-2);
  }

  .nav__cta { display: none; }
  .nav__mobile { display: block; }

  /* Hero */
  .hero {
    padding: 100px var(--gap) 60px;
    min-height: auto;
  }

  .hero__title {
    font-size: clamp(32px, 10vw, 52px);
  }

  /* Bento */
  .bento {
    grid-template-columns: 1fr;
  }
  .bento__card--lg {
    grid-column: span 1;
  }

  /* Diff */
  .diff {
    grid-template-columns: 1fr;
  }

  .diff__sep {
    justify-self: center;
    transform: rotate(90deg);
  }

  /* Steps */
  .step {
    grid-template-columns: 56px 1fr;
  }

  /* Metrics */
  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Reasons */
  .reasons {
    grid-template-columns: 1fr;
  }

  .reason {
    padding: 24px 0;
  }

  .reason:nth-child(even) {
    padding-left: 0;
    border-left: none;
  }

  /* Audience */
  .audience {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  /* CTA */
  .cta__inner {
    padding: 48px 24px;
  }
}

@media (max-width: 480px) {
  .metrics {
    grid-template-columns: 1fr;
  }

  .metric__val {
    font-size: 36px;
  }

  .section__title {
    font-size: 28px;
  }

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