/* AI Workflow Builder — static landing page */
:root {
  --bg: #0b0d14;
  --bg-alt: #11141f;
  --panel: #171b29;
  --border: #262c3f;
  --text: #e8eaf2;
  --text-dim: #9aa3bd;
  --accent: #6366f1;
  --accent-strong: #818cf8;
  --accent-soft: rgba(99, 102, 241, 0.14);
  --green: #34d399;
  --radius: 14px;
  --maxw: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: rgba(255, 255, 255, 0.07);
  padding: 0.1em 0.35em;
  border-radius: 5px;
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 13, 20, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.02rem;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  font-size: 1.15rem;
}

.nav-links {
  display: flex;
  gap: 1.4rem;
  font-size: 0.92rem;
}

.nav-links a {
  color: var(--text-dim);
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.72rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #fff;
  box-shadow: 0 4px 22px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.5);
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.btn-sm {
  padding: 0.45rem 1.05rem;
  font-size: 0.88rem;
}

/* ---------- hero ---------- */
.hero {
  padding: 4.5rem 1.5rem 3rem;
  background:
    radial-gradient(60% 50% at 50% 0%, rgba(99, 102, 241, 0.16) 0%, transparent 70%),
    var(--bg);
}

.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--green);
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.25);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 1.4rem;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.3rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 850px;
  margin: 0 auto 1.1rem;
}

.hero-sub {
  color: var(--text-dim);
  font-size: 1.08rem;
  max-width: 720px;
  margin: 0 auto 1.8rem;
}

.hero-sub strong {
  color: var(--text);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  margin-bottom: 1.4rem;
}

.hero-meta {
  color: var(--text-dim);
  font-size: 0.88rem;
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 2.6rem;
}

.hero-shot {
  max-width: 960px;
  margin: 0 auto;
}

.hero-shot img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
}

/* ---------- sections ---------- */
.section {
  padding: 4rem 1.5rem;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
}

.section h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  letter-spacing: -0.015em;
  margin-bottom: 0.6rem;
}

.section-sub {
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 2.6rem;
}

/* steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
  text-align: left;
}

.step {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
}

.step-num {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-strong);
}

.step h3 {
  margin: 0.5rem 0 0.6rem;
  font-size: 1.12rem;
}

.step p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  text-align: left;
}

.feature {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.feature-icon {
  font-size: 1.4rem;
}

.feature h3 {
  margin: 0.7rem 0 0.5rem;
  font-size: 1.05rem;
}

.feature p {
  color: var(--text-dim);
  font-size: 0.93rem;
}

/* quickstart */
.quickstart {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 1.5rem;
  text-align: left;
  align-items: stretch;
}

.quickstart-copy {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.4rem;
}

.quickstart-steps {
  list-style: none;
  counter-reset: qs;
  display: flex;
  flex-direction: column;
  gap: 1.05rem;
}

.quickstart-steps li {
  counter-increment: qs;
  position: relative;
  padding-left: 2.3rem;
  color: var(--text-dim);
  font-size: 0.96rem;
}

.quickstart-steps li::before {
  content: counter(qs);
  position: absolute;
  left: 0;
  top: 0.05rem;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quickstart-steps strong {
  color: var(--text);
}

.codeblock {
  margin: 0;
  background: #0d1020;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.7rem;
  overflow-x: auto;
  font-size: 0.92rem;
  line-height: 1.75;
}

.codeblock code {
  background: none;
  padding: 0;
}

.codeblock .cmt {
  color: #64748b;
}

.codeblock .prompt {
  color: var(--green);
  font-weight: 700;
}

.quickstart-note {
  margin-top: 1.4rem;
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* final CTA */
.cta {
  background:
    radial-gradient(55% 60% at 50% 100%, rgba(139, 92, 246, 0.14) 0%, transparent 70%),
    var(--bg);
}

.cta h2 {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem 2.4rem;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer a {
  color: var(--text-dim);
}

.footer a:hover {
  color: var(--accent-strong);
}

.footer-legal {
  color: #5b647d;
  font-size: 0.85rem;
}

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding-top: 3rem;
  }

  .quickstart {
    grid-template-columns: 1fr;
  }
}