/* ======================================================
   CIUF — Marketing Site
   Design: dark theme, #964DE0 accent, glassmorphism cards
   ====================================================== */

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

:root {
  --bg:           #0A0A0F;
  --bg-surface:   #111118;
  --bg-card:      #15151F;
  --bg-code:      #0D0D16;
  --border:       rgba(150, 77, 224, 0.15);
  --border-card:  rgba(255,255,255,0.06);

  --accent:       #964DE0;
  --accent-light: #B37AF8;
  --accent-dim:   rgba(150, 77, 224, 0.18);
  --accent-glow:  rgba(150, 77, 224, 0.35);

  --text:         #F0EEFF;
  --text-2:       #8A8AA8;
  --text-3:       #5A5A72;
  --code-green:   #6EE7B7;
  --code-purple:  #C084FC;
  --code-yellow:  #FDE68A;
  --code-blue:    #7DD3FC;
  --code-comment: #4B5563;

  --radius:       12px;
  --radius-sm:    8px;
  --transition:   0.2s ease;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  --max-w: 1100px;
  --section-gap: 120px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ---------- Utility ---------------------------------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.text-accent { color: var(--accent-light); }
.text-muted  { color: var(--text-2); }
.mono        { font-family: var(--mono); }

/* ---------- Scrollbar -------------------------------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 3px; }

/* ======================================================
   NAVIGATION
   ====================================================== */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  transition: background var(--transition), border-color var(--transition);
}
nav.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.nav-logo svg { flex-shrink: 0; }
.nav-logo-img { flex-shrink: 0; filter: brightness(0) invert(1); }
.footer-logo-img { flex-shrink: 0; filter: brightness(0) invert(1); }
.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  margin-left: auto;
}
.nav-links a {
  font-size: 0.875rem;
  color: var(--text-2);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
}

/* ======================================================
   BUTTONS
   ====================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}
.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border-color: var(--border-card);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.04);
}
.btn-outline {
  background: transparent;
  color: var(--accent-light);
  border-color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent-dim);
  color: var(--text);
  box-shadow: 0 0 16px var(--accent-glow);
}
.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
  border-radius: var(--radius);
}

/* ======================================================
   HERO SECTION
   ====================================================== */
#hero {
  padding: 140px 24px 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(150,77,224,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 80%, rgba(150,77,224,0.08) 0%, transparent 60%);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 28px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.hero-badge span { color: var(--text-2); font-weight: 400; text-transform: none; }
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  max-width: 820px;
  margin: 0 auto 20px;
}
.hero-title .accent-word {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-2);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}
.hero-install {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-code);
  border: 1px solid var(--border-card);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--code-green);
  cursor: pointer;
  transition: all var(--transition);
}
.hero-install:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}
.hero-install .prompt { color: var(--text-3); }
.copy-icon { color: var(--text-3); transition: color var(--transition); font-size: 0.85rem; }
.hero-install:hover .copy-icon { color: var(--accent-light); }

/* Hero benchmark preview */
.hero-benchmark {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.bench-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 0.85rem;
}
.bench-label { color: var(--text-2); min-width: 100px; text-align: left; }
.bench-bar-wrap { width: 120px; height: 6px; background: rgba(255,255,255,0.06); border-radius: 3px; overflow: hidden; }
.bench-bar {
  height: 100%;
  border-radius: 3px;
  width: 0;
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.bench-bar.cold  { background: var(--text-3); }
.bench-bar.redis { background: #F59E0B; }
.bench-bar.ciuf  { background: linear-gradient(90deg, var(--accent), var(--accent-light)); box-shadow: 0 0 8px var(--accent-glow); }
.bench-val { font-family: var(--mono); font-size: 0.8rem; font-weight: 700; min-width: 42px; text-align: right; }
.bench-val.green { color: var(--code-green); }
.bench-val.yellow { color: #F59E0B; }
.bench-val.muted { color: var(--text-3); }

/* ======================================================
   DIVIDER / SECTION LABELS
   ====================================================== */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 16px;
}
.section-label::before {
  content: "";
  display: block;
  width: 20px;
  height: 1px;
  background: var(--accent);
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}
.section-sub {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 56px;
}

/* ======================================================
   PROBLEM SECTION
   ====================================================== */
#problem {
  padding: var(--section-gap) 24px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-card);
  border-bottom: 1px solid var(--border-card);
}
#problem .container { text-align: center; }
.problem-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: start;
  margin-top: 48px;
}
.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 28px;
  text-align: left;
}
.problem-card.bad  { border-color: rgba(239,68,68,0.2); }
.problem-card.good { border-color: rgba(150,77,224,0.3); box-shadow: 0 0 24px rgba(150,77,224,0.1); }
.problem-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  font-weight: 700;
  font-size: 1rem;
}
.problem-card.bad  .problem-card-header { color: #F87171; }
.problem-card.good .problem-card-header { color: var(--accent-light); }
.problem-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-card);
  font-size: 0.875rem;
  color: var(--text-2);
}
.problem-item:last-child { border-bottom: none; }
.problem-item .icon { flex-shrink: 0; margin-top: 2px; font-size: 0.9rem; }
.problem-item .icon.bad  { color: #F87171; }
.problem-item .icon.good { color: var(--code-green); }
.problem-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--text-3);
  align-self: center;
}

/* ======================================================
   HOW IT WORKS
   ====================================================== */
#how {
  padding: var(--section-gap) 24px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
}
.step {
  position: relative;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  color: var(--accent-light);
  font-weight: 800;
  font-size: 0.875rem;
  margin-bottom: 16px;
}
.step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.step p {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 16px;
}
.step-connector {
  position: absolute;
  top: 18px;
  right: -16px;
  width: 32px;
  text-align: center;
  color: var(--text-3);
  font-size: 1.2rem;
  z-index: 1;
}

/* ======================================================
   CODE BLOCK (shared)
   ====================================================== */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.8;
}
.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border-card);
}
.code-dot { width: 10px; height: 10px; border-radius: 50%; }
.code-dot.red    { background: #FF5F57; }
.code-dot.yellow { background: #FEBC2E; }
.code-dot.green  { background: #28C840; }
.code-lang {
  margin-left: auto;
  font-size: 0.72rem;
  color: var(--text-3);
  font-family: var(--font);
  letter-spacing: 0.05em;
}
.code-body { padding: 20px; overflow-x: auto; }
.code-body pre { margin: 0; }
.kw  { color: var(--code-purple); }
.fn  { color: var(--code-blue); }
.str { color: var(--code-green); }
.num { color: var(--code-yellow); }
.cm  { color: var(--code-comment); }
.op  { color: var(--text-2); }

/* ======================================================
   FEATURES GRID
   ====================================================== */
#features {
  padding: var(--section-gap) 24px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-card);
  border-bottom: 1px solid var(--border-card);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, var(--accent-dim), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.feature-card:hover {
  border-color: rgba(150,77,224,0.35);
  box-shadow: 0 4px 32px rgba(150,77,224,0.12);
  transform: translateY(-2px);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 16px;
  display: block;
}
.feature-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-desc {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ======================================================
   CODE EXAMPLES (TABS)
   ====================================================== */
#code-examples {
  padding: var(--section-gap) 24px;
}
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 0;
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 0;
}
.tab-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-2);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: all var(--transition);
  position: relative;
  bottom: -1px;
  border: 1px solid transparent;
  border-bottom: none;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent-light);
  background: var(--bg-code);
  border-color: var(--border-card);
  border-bottom-color: var(--bg-code);
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}
.tab-panel .code-block {
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  border-top: none;
}

/* ======================================================
   VS REDIS TABLE
   ====================================================== */
#vs-redis {
  padding: var(--section-gap) 24px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-card);
  border-bottom: 1px solid var(--border-card);
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 48px;
  font-size: 0.9rem;
}
.compare-table th {
  padding: 14px 20px;
  text-align: left;
  font-weight: 700;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-card);
  color: var(--text-2);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.compare-table th:nth-child(2),
.compare-table th:nth-child(3) { text-align: center; }
.compare-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-card);
  color: var(--text-2);
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: rgba(255,255,255,0.02); }
.compare-table td:nth-child(2),
.compare-table td:nth-child(3) { text-align: center; }
.check { color: var(--code-green); font-size: 1rem; }
.cross { color: #F87171; font-size: 1rem; }
.partial { color: #F59E0B; font-size: 0.8rem; font-weight: 600; }
.highlight-col td:nth-child(2) { color: var(--text); font-weight: 600; }

/* ======================================================
   STATUS / ROADMAP
   ====================================================== */
#status {
  padding: var(--section-gap) 24px;
}
#status .container { text-align: center; }
.milestones {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 48px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.milestone {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
}
.milestone.done {
  border-color: rgba(110,231,183,0.2);
}
.milestone.gate {
  border-color: rgba(150,77,224,0.3);
  background: rgba(150,77,224,0.05);
}
.ms-icon { font-size: 1.2rem; flex-shrink: 0; }
.ms-body {}
.ms-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}
.ms-desc {
  font-size: 0.78rem;
  color: var(--text-2);
}
.milestone.done .ms-title { color: var(--code-green); }
.milestone.gate .ms-title { color: var(--accent-light); }
.ms-note {
  margin-top: 24px;
  font-size: 0.82rem;
  color: var(--text-3);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ======================================================
   INSTALL CTA
   ====================================================== */
#install {
  padding: var(--section-gap) 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.install-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse 60% 80% at 50% 50%, rgba(150,77,224,0.12) 0%, transparent 70%);
}
#install .section-title { margin-bottom: 12px; }
.install-sub {
  color: var(--text-2);
  font-size: 1rem;
  margin-bottom: 40px;
}
.install-cmd {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-code);
  border: 1px solid var(--border);
  padding: 14px 24px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--code-green);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 32px;
}
.install-cmd:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}
.install-cmd .prompt { color: var(--text-3); }
.install-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ======================================================
   FOOTER
   ====================================================== */
footer {
  border-top: 1px solid var(--border-card);
  padding: 40px 24px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { font-size: 0.85rem; color: var(--text-2); transition: color var(--transition); }
.footer-links a:hover { color: var(--text); }
.footer-copy { font-size: 0.8rem; color: var(--text-3); }

/* ======================================================
   ANIMATIONS
   ====================================================== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: none;
}
.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }
.fade-up-delay-5 { transition-delay: 0.5s; }

/* ======================================================
   TOAST (copy feedback)
   ====================================================== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  opacity: 0;
  transition: all 0.25s ease;
  pointer-events: none;
  z-index: 999;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ======================================================
   RESPONSIVE
   ====================================================== */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .step-connector { display: none; }
  .problem-grid { grid-template-columns: 1fr; gap: 16px; }
  .problem-vs { display: none; }
}

@media (max-width: 640px) {
  :root { --section-gap: 72px; }
  .features-grid { grid-template-columns: 1fr; }
  .milestones { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero-benchmark { flex-direction: column; align-items: center; }
  .bench-chip { width: 100%; max-width: 340px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .compare-table { font-size: 0.8rem; }
  .compare-table th, .compare-table td { padding: 10px 12px; }
}