/* ============ HillBean - Global Styles ============ */
:root {
  --ink: #0b1020;
  --ink-2: #172040;
  --text: #1f2437;
  --muted: #6b7385;
  --brand: #6366f1;
  --brand-2: #22d3ee;
  --accent: #f59e0b;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --line: #e7eaf3;
  --radius: 14px;
  --shadow: 0 18px 50px -20px rgba(23, 32, 64, .18);
  --grad: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

.container { width: min(1120px, 92%); margin: 0 auto; }

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: .85rem 1.7rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  cursor: pointer;
  border: none;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 12px 30px -10px rgba(99,102,241,.55); }
.btn-ghost { color: var(--ink-2); border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-light { background: #fff; color: var(--ink); box-shadow: 0 10px 30px -10px rgba(0,0,0,.35); }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed; inset: 0 0 auto 0;
  z-index: 50;
  padding: 14px 0;
  transition: background .3s, box-shadow .3s, padding .3s;
}
.navbar.scrolled {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 6px 24px -12px rgba(11,16,32,.18);
  padding: 10px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }

.logo { display: inline-flex; align-items: center; gap: 10px; font-size: 1.15rem; font-weight: 800; color: var(--ink); }
.logo em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  background: var(--grad); color: #fff; font-size: 1rem;
  box-shadow: 0 8px 18px -6px rgba(99,102,241,.6);
}

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: .95rem; font-weight: 500; color: var(--muted); transition: color .2s; }
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  background: var(--grad); color: #fff !important;
  padding: .55rem 1.2rem; border-radius: 999px; font-weight: 600;
  box-shadow: 0 8px 20px -8px rgba(99,102,241,.6);
}
.nav-cta:hover { transform: translateY(-1px); }

.hamburger { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; }
.hamburger span { width: 24px; height: 2.5px; border-radius: 2px; background: var(--ink); transition: transform .3s, opacity .3s; }
.hamburger.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 170px 0 90px;
  overflow: hidden;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(99,102,241,.12), transparent 60%),
              radial-gradient(900px 500px at 10% 10%, rgba(34,211,238,.14), transparent 60%),
              var(--bg-soft);
}
.hero-glow {
  position: absolute; width: 420px; height: 420px; border-radius: 50%;
  background: var(--grad); filter: blur(120px); opacity: .25;
  right: -80px; top: 60px; pointer-events: none;
}
.hero-content { position: relative; }
.badge {
  display: inline-block; padding: .4rem 1rem; border-radius: 999px;
  background: #fff; border: 1px solid var(--line);
  font-size: .82rem; font-weight: 600; color: var(--brand);
  box-shadow: 0 6px 18px -10px rgba(23,32,64,.2);
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.18; font-weight: 800;
  color: var(--ink); margin: 22px 0 18px;
  letter-spacing: -.02em;
}
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-sub { max-width: 560px; color: var(--muted); font-size: 1.05rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 30px 0 46px; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 14px; max-width: 640px;
}
.stat {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px;
  box-shadow: var(--shadow);
  text-align: center;
}
.stat strong { font-size: 1.7rem; font-weight: 800; color: var(--ink); }
.stat span { font-size: 1.2rem; font-weight: 700; color: var(--brand); }
.stat small { display: block; color: var(--muted); font-size: .8rem; margin-top: 4px; }

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 48px; }
.section-tag {
  display: inline-block; font-size: .78rem; letter-spacing: .18em;
  text-transform: uppercase; font-weight: 700; color: var(--brand);
  margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); color: var(--ink); font-weight: 800; letter-spacing: -.02em; }
.section-head p { color: var(--muted); margin-top: 12px; }

/* Cards */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 26px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s;
  position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: var(--grad); transform: scaleX(0); transform-origin: left;
  transition: transform .35s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.card:hover::before { transform: scaleX(1); }
.card-icon { font-size: 2rem; margin-bottom: 14px; }
.card h3 { font-size: 1.08rem; color: var(--ink); margin-bottom: 8px; font-weight: 700; }
.card p { color: var(--muted); font-size: .93rem; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 18px; position: relative; transition: transform .25s, box-shadow .25s;
}
.step:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.step-num {
  font-size: 1.6rem; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
}
.step h3 { font-size: 1rem; color: var(--ink); font-weight: 700; margin-bottom: 6px; }
.step p { font-size: .85rem; color: var(--muted); }

/* Cases */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: transform .25s, box-shadow .25s;
}
.case:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case-img {
  height: 130px; position: relative;
  background: linear-gradient(135deg, var(--c1), var(--c2));
}
.case-ind {
  position: absolute; left: 18px; bottom: 14px;
  background: rgba(255,255,255,.9); color: var(--ink);
  font-size: .78rem; font-weight: 700;
  padding: .3rem .8rem; border-radius: 999px;
}
.case-body { padding: 22px; }
.case-body h3 { color: var(--ink); font-size: 1.05rem; margin-bottom: 8px; }
.case-body p { color: var(--muted); font-size: .9rem; margin-bottom: 14px; }
.case-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.case-tags span {
  font-size: .75rem; font-weight: 600; color: var(--brand);
  background: rgba(99,102,241,.1); border-radius: 999px; padding: .25rem .7rem;
}

/* Why */
.why-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.why {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 28px; display: flex; gap: 16px; align-items: flex-start;
  transition: transform .25s, box-shadow .25s;
}
.why:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.why h3 { font-size: 1.05rem; color: var(--ink); font-weight: 700; margin-bottom: 6px; }
.why p { color: var(--muted); font-size: .92rem; }
.why::before {
  content: "◆"; color: var(--brand); font-size: 1rem; margin-top: 3px;
}

/* ---------- CTA ---------- */
.cta {
  position: relative; overflow: hidden;
  background: radial-gradient(800px 400px at 20% 0%, rgba(34,211,238,.35), transparent 55%),
              radial-gradient(700px 400px at 90% 100%, rgba(99,102,241,.5), transparent 55%),
              var(--ink);
  padding: 90px 0;
  color: #fff;
}
.cta-inner { text-align: center; max-width: 560px; }
.cta h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); font-weight: 800; margin-bottom: 12px; }
.cta p { color: rgba(255,255,255,.75); margin-bottom: 30px; }

.contact-form { display: grid; gap: 12px; text-align: left; }
.contact-form input,
.contact-form textarea {
  width: 100%; padding: .9rem 1.1rem;
  border-radius: 10px; border: 1px solid rgba(255,255,255,.25);
  background: rgba(255,255,255,.1); color: #fff;
  font-size: .95rem; font-family: inherit;
  outline: none; transition: border-color .2s, background .2s;
  resize: vertical;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: rgba(255,255,255,.55); }
.contact-form input:focus,
.contact-form textarea:focus { border-color: var(--brand-2); background: rgba(255,255,255,.16); }
.contact-form .btn { width: 100%; justify-self: center; min-width: 200px; }
.form-note { font-size: .88rem; min-height: 1.4em; }
.form-note.ok { color: #7df9c4; }
.form-note.err { color: #ffb4b4; }
.cta-alt { color: rgba(255,255,255,.7); font-size: .92rem; }
.cta-alt a { color: var(--brand-2); font-weight: 600; text-decoration: underline; }

/* ---------- Footer ---------- */
.footer { background: #0a0e1c; color: rgba(255,255,255,.7); padding: 60px 0 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 30px;
  padding-bottom: 40px;
}
.footer .logo { color: #fff; }
.footer p { font-size: .88rem; margin-top: 14px; color: rgba(255,255,255,.5); }
.footer h4 { font-size: .9rem; color: #fff; font-weight: 700; margin-bottom: 14px; }
.footer a:not(.logo) { display: block; font-size: .88rem; color: rgba(255,255,255,.55); margin: 8px 0; transition: color .2s; }
.footer a:not(.logo):hover { color: var(--brand-2); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 0; font-size: .8rem; text-align: center; color: rgba(255,255,255,.35);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.footer-bottom .icp a { color: rgba(255,255,255,.35); text-decoration: none; }
.footer-bottom .icp a:hover { color: var(--brand-2); text-decoration: underline; }

/* ---------- Reveal animations ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .cards-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: min(78vw, 320px);
    height: 100vh; background: #fff;
    flex-direction: column; align-items: flex-start; justify-content: center;
    gap: 26px; padding: 40px;
    box-shadow: -10px 0 40px rgba(11,16,32,.15);
    transition: right .35s ease;
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1.05rem; }
  .cards-grid, .cases-grid, .why-grid, .footer-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .hero { padding: 140px 0 70px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}