:root {
  --bg: #08080d;
  --bg-soft: #0e0e17;
  --card: rgba(255,255,255,0.035);
  --card-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.09);
  --border-hover: rgba(167,139,250,0.5);
  --text: #f3f3f8;
  --text-dim: #9797ad;
  --text-dimmer: #6b6b80;
  --accent: #8b5cf6;
  --accent-2: #6366f1;
  --accent-soft: rgba(139,92,246,0.15);
  --radius: 16px;
  --container: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ---------- background fx ---------- */
.bg-fx {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  will-change: transform;
  transition: transform 1.1s cubic-bezier(.16,.8,.3,1);
}

.blob-a {
  width: 520px; height: 520px;
  top: -120px; left: 8%;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  animation: drift-a 22s ease-in-out infinite;
}
.blob-b {
  width: 460px; height: 460px;
  top: 20%; right: 4%;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
  animation: drift-b 26s ease-in-out infinite;
}
.blob-c {
  width: 400px; height: 400px;
  bottom: -140px; left: 35%;
  background: radial-gradient(circle, #c084fc 0%, transparent 70%);
  opacity: 0.35;
  animation: drift-c 30s ease-in-out infinite;
}

@keyframes drift-a {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(40px, 30px); }
}
@keyframes drift-b {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(-50px, 20px); }
}
@keyframes drift-c {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(30px, -40px); }
}

.grain {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 3px 3px;
  opacity: 0.4;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(8,8,13,0.65);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 20px var(--accent-soft);
  flex-shrink: 0;
}

.logo-text {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.logo-text .accent { color: var(--accent); }

.nav { flex: 1; }

.header-actions {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color .2s ease;
}
.nav-list a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  margin-left: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--text-dim);
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease;
}

.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding: 10px 24px 20px;
  border-top: 1px solid var(--border);
  background: rgba(8,8,13,0.97);
}

.mobile-nav.is-open { display: flex; }

.mobile-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 12px 2px;
  border-bottom: 1px solid var(--border);
}
.mobile-nav a:hover { color: var(--text); }

.mobile-nav .btn { margin-top: 14px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  padding: 11px 22px;
  box-shadow: 0 4px 24px rgba(139,92,246,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(139,92,246,0.5);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 11px 22px;
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  background: var(--card);
}

.btn-lg { padding: 15px 28px; font-size: 15px; }
.btn-block { width: 100%; padding: 13px 22px; margin-top: 6px; }
.btn-header { padding: 9px 18px; font-size: 13.5px; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding: 120px 0 90px;
}

.hero-inner {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.tag-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.tag {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-dim);
  border: 1px solid var(--border);
  background: var(--card);
  padding: 6px 14px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.tag-link {
  text-decoration: none;
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background .2s ease, transform .2s ease;
}
.tag-link:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: var(--card-hover);
  transform: translateY(-1px);
}

.hero-title {
  font-size: clamp(34px, 5.5vw, 58px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}

.accent-text {
  background: linear-gradient(135deg, var(--accent), #c084fc 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-fade {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 120px;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}

.hero-meta {
  margin-top: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--text-dimmer);
  font-size: 13px;
}

.hero-meta-dot { color: var(--border-hover); }

/* ---------- cases section ---------- */
.cases {
  position: relative;
  z-index: 1;
  padding: 20px 0 90px;
  scroll-margin-top: 90px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.case-card {
  display: flex;
  flex-direction: column;
  min-height: 460px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 28px;
  scroll-margin-top: 90px;
  transition: border-color .25s ease, background .25s ease, transform .25s ease;
}

.case-card:target {
  border-color: var(--border-hover);
  background: var(--card-hover);
  animation: case-pulse 1.4s ease;
}

@keyframes case-pulse {
  0% { box-shadow: 0 0 0 0 rgba(139,92,246,0.35); }
  70% { box-shadow: 0 0 0 14px rgba(139,92,246,0); }
  100% { box-shadow: 0 0 0 0 rgba(139,92,246,0); }
}

.case-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-size: 20px;
  margin-bottom: 20px;
}

.case-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 16px;
}

.case-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.case-card li {
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.5;
  padding-left: 18px;
  position: relative;
  margin-bottom: 10px;
}

.case-card li:last-child { margin-bottom: 0; }

.case-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.case-outcome {
  margin: auto 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

/* ---------- stack section ---------- */
.stack {
  position: relative;
  z-index: 1;
  padding: 40px 0 100px;
}

.section-head {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 56px;
}

.section-head h2 {
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

.section-head p {
  color: var(--text-dim);
  font-size: 16px;
  margin: 0;
}

.stack-group { margin-bottom: 44px; }
.stack-group:last-child { margin-bottom: 0; }

.stack-group-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-dimmer);
  margin: 0 0 18px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 14px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 22px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .25s ease, border-color .25s ease, background .25s ease, box-shadow .25s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--card-hover);
  box-shadow: 0 10px 30px rgba(139,92,246,0.18);
}

.tool-card img {
  width: 30px;
  height: 30px;
  opacity: 0.85;
  transition: opacity .25s ease;
}
.tool-card:hover img { opacity: 1; }

.icon-fallback-mark {
  display: none;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  align-items: center;
  justify-content: center;
}

.tool-card.icon-fallback img { display: none; }
.tool-card.icon-fallback .icon-fallback-mark { display: flex; }

.tool-card span {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  text-align: center;
}

/* ---------- process section ---------- */
.process {
  position: relative;
  z-index: 1;
  padding: 20px 0 100px;
  scroll-margin-top: 90px;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.process-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px 24px;
  transition: border-color .25s ease, background .25s ease, transform .25s ease;
}
.process-step:hover {
  border-color: var(--border-hover);
  background: var(--card-hover);
  transform: translateY(-4px);
}

.process-num {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.process-step h3 { font-size: 17px; font-weight: 700; margin: 0 0 10px; }

.process-step p { color: var(--text-dim); font-size: 14px; line-height: 1.55; margin: 0; }

/* ---------- examples / tabs section ---------- */
.examples {
  position: relative;
  z-index: 1;
  padding: 20px 0 100px;
  scroll-margin-top: 90px;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 32px;
}

.tab-btn {
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-dim);
  background: var(--card);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background .2s ease, box-shadow .2s ease;
}
.tab-btn:hover { color: var(--text); border-color: var(--border-hover); }
.tab-btn.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(139,92,246,0.32);
}

.tab-panels {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
}

.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: tab-fade .35s ease; }

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

.tab-row {
  padding: 0 0 20px 20px;
  border-left: 2px solid var(--border);
  margin-bottom: 20px;
}
.tab-row:last-child { margin-bottom: 0; padding-bottom: 0; }
.tab-row-result { border-left-color: var(--accent); }

.tab-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.tab-row-result .tab-label { color: var(--accent); }

.tab-row p { margin: 0; color: var(--text); font-size: 15px; line-height: 1.6; }

/* ---------- why us section ---------- */
.why {
  position: relative;
  z-index: 1;
  padding: 20px 0 100px;
  scroll-margin-top: 90px;
}

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

.why-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 26px 24px;
  transition: border-color .25s ease, background .25s ease, transform .25s ease;
}
.why-card:hover {
  border-color: var(--border-hover);
  background: var(--card-hover);
  transform: translateY(-4px);
}
.why-card h3 { font-size: 16.5px; font-weight: 700; margin: 0 0 10px; }
.why-card p { color: var(--text-dim); font-size: 14px; line-height: 1.55; margin: 0; }

/* ---------- faq section ---------- */
.faq {
  position: relative;
  z-index: 1;
  padding: 20px 0 100px;
  scroll-margin-top: 90px;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 4px 24px;
  transition: border-color .25s ease, background .25s ease;
}
.faq-item[open] { border-color: var(--border-hover); background: var(--card-hover); }

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 36px 18px 0;
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--text-dim);
  transition: transform .25s ease, color .25s ease;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); color: var(--accent); }

.faq-item p {
  margin: 0 0 20px;
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.6;
}

/* ---------- cta band ---------- */
.cta-band {
  position: relative;
  z-index: 1;
  padding: 20px 0 110px;
}

.cta-band-inner {
  text-align: center;
  padding: 56px 32px;
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(139,92,246,0.12), rgba(99,102,241,0.06));
  border: 1px solid var(--border);
}

.cta-band-inner h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin: 0 0 12px;
  font-weight: 700;
}

.cta-band-inner p {
  color: var(--text-dim);
  margin: 0 0 28px;
  font-size: 16px;
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 56px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-dimmer);
  margin: 0 0 16px;
}

.footer-brand .logo { margin-bottom: 14px; }

.footer-note {
  color: var(--text-dimmer);
  font-size: 13.5px;
  line-height: 1.6;
  margin: 0;
  max-width: 320px;
}

.footer-col nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color .2s ease;
}
.footer-col nav a:hover { color: var(--text); }

.footer-cta .footer-note { margin-bottom: 16px; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.footer-bottom p {
  margin: 0;
  color: var(--text-dimmer);
  font-size: 13px;
}

/* ---------- reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(5,5,10,0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity .25s ease;
}

.modal-overlay.is-open { opacity: 1; }
.modal-overlay[hidden] { display: none; }

.modal {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 32px 32px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  transform: translateY(16px) scale(0.98);
  transition: transform .3s cubic-bezier(.16,.8,.3,1);
}

.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
}

.modal h3 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
}

.modal-sub {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0 0 24px;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}
.modal-close:hover { background: var(--card); color: var(--text); }

.field { margin-bottom: 16px; }

.field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 7px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 13px;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color .2s ease, background .2s ease;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.06);
}

.field select { color: var(--text); }
.field select option { background: var(--bg-soft); }

.modal-success {
  text-align: center;
  padding: 12px 0 4px;
}

.success-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
}

.modal-success h3 { margin-bottom: 8px; }
.modal-success p { color: var(--text-dim); font-size: 14px; margin: 0 0 24px; }

.form-error {
  color: #f87171;
  font-size: 13px;
  margin: -6px 0 14px;
}

.btn:disabled { opacity: 0.7; cursor: default; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .nav-list { display: none; }
  .nav-toggle { display: flex; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .hero { padding: 90px 0 60px; }
  .header-inner { height: 64px; }
  .btn-header { padding: 8px 14px; font-size: 12.5px; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(105px, 1fr)); }
  .process-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .tab-panels { padding: 24px 20px; }
  .tab-btn { font-size: 12.5px; padding: 9px 14px; }
  .hero-meta { font-size: 12px; gap: 8px; }
}