:root {
  --bg: #f7f6f2; --bg-2: #efede7; --ink: #1b1a17; --ink-soft: #5d5a51; --ink-faint: #8a867b;
  --border: #e0ddd4; --card: #ffffff; --accent: #1b1a17; --accent-ink: #ffffff; --wash: #e9e7e0;
  --hi: #c8372d; --hi-wash: #fbe9e6; --mock: #ffffff; --mock-bg: #f1efe9; --shadow: 0 30px 60px -30px rgba(20,18,12,.35);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14130f; --bg-2: #1b1a15; --ink: #ece7db; --ink-soft: #aaa493; --ink-faint: #7c7769;
    --border: #2d2b24; --card: #1d1c17; --accent: #ece7db; --accent-ink: #14130f; --wash: #26241d;
    --hi: #e36b5f; --hi-wash: #3a2320; --mock: #1d1c17; --mock-bg: #23221c; --shadow: 0 30px 60px -30px rgba(0,0,0,.8);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: 'Pretendard Variable', Pretendard, -apple-system, system-ui, sans-serif; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
h1, h2, h3, h4, h5 { line-height: 1.2; margin: 0; letter-spacing: -0.015em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; margin-bottom: 14px; }
.lead { color: var(--ink-soft); max-width: 640px; margin: 0 0 26px; font-size: 1.02rem; }
.fine { color: var(--ink-faint); font-size: 13px; margin-top: 16px; }
main > section { max-width: 1040px; margin: 0 auto; padding: 72px 24px; }
main > section + section { border-top: 1px solid var(--border); }

/* Top bar */
.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 24px; padding: 12px 24px; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 1.12rem; text-decoration: none; letter-spacing: -0.02em; }
.brand.small { font-size: 1rem; }
.mark { width: 26px; height: 26px; }
.mark rect { fill: var(--accent); }
.mark path { fill: var(--accent-ink); }
.menu { display: flex; gap: 20px; margin-left: 8px; font-size: 14.5px; }
.menu a { text-decoration: none; color: var(--ink-soft); }
.menu a:hover { color: var(--ink); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.link { text-decoration: none; font-size: 14.5px; color: var(--ink-soft); }
.link:hover { color: var(--ink); }

/* Buttons */
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink) !important; text-decoration: none; padding: 13px 22px; border-radius: 12px; font-weight: 700; font-size: 15.5px; transition: transform .12s ease, opacity .12s ease; }
.btn:hover { transform: translateY(-1px); }
.btn.small { padding: 9px 15px; font-size: 14px; border-radius: 10px; }
.btn.big { padding: 16px 30px; font-size: 1.05rem; border-radius: 14px; }
.btn.ghost { background: var(--wash); color: var(--ink) !important; }
.btn.disabled { opacity: .55; cursor: default; transform: none !important; }

/* Hero */
.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; padding-top: 80px; padding-bottom: 88px; }
.eyebrow { display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: .06em; color: var(--hi); background: var(--hi-wash); padding: 5px 10px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(2.1rem, 4.4vw, 3.3rem); font-weight: 800; }
.hero p { color: var(--ink-soft); font-size: 1.08rem; margin: 20px 0 26px; max-width: 520px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.proof { list-style: none; padding: 0; margin: 26px 0 0; display: flex; gap: 18px; flex-wrap: wrap; font-size: 13.5px; color: var(--ink-soft); }
.proof li::before { content: '✓'; color: var(--hi); font-weight: 800; margin-right: 6px; }

/* Chat mock */
.mock { background: var(--mock); border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); overflow: hidden; font-size: 13.5px; }
.mock-bar { display: flex; align-items: center; gap: 7px; padding: 12px 14px; border-bottom: 1px solid var(--border); background: var(--mock-bg); }
.mock-bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.mock-model { margin-left: auto; font-weight: 600; font-size: 12.5px; background: var(--card); border: 1px solid var(--border); padding: 4px 10px; border-radius: 999px; }
.mock-body { padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 88%; padding: 10px 13px; border-radius: 14px; line-height: 1.5; }
.msg.user { align-self: flex-end; background: var(--accent); color: var(--accent-ink); border-bottom-right-radius: 4px; }
.msg.ai { align-self: flex-start; background: var(--mock-bg); border-bottom-left-radius: 4px; }
.msg.ai p { margin: 0 0 6px; }
.who { font-size: 11.5px; font-weight: 700; color: var(--hi); margin-bottom: 4px; }
.who.alt { color: #2f7d4f; }
.msg table { width: 100%; border-collapse: collapse; font-size: 12px; margin-top: 4px; background: var(--card); border-radius: 8px; overflow: hidden; }
.msg th, .msg td { padding: 5px 8px; border-bottom: 1px solid var(--border); text-align: left; }
.msg th { font-weight: 700; color: var(--ink-soft); }
.mock-input { margin: 4px 16px 10px; display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border: 1px solid var(--border); border-radius: 12px; color: var(--ink-faint); }
.mock-input b { width: 26px; height: 26px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-size: 13px; }
.mock-credit { padding: 8px 16px 12px; font-size: 12px; color: var(--ink-faint); text-align: right; }

/* Models */
.badges { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.badges li { padding: 10px 16px; border: 1px solid var(--border); border-radius: 999px; background: var(--card); font-weight: 600; font-size: 14.5px; }

/* How */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: step; }
.steps li { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 22px; }
.steps .n { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 800; font-size: 14px; margin-bottom: 12px; }
.steps h3 { font-size: 1.05rem; margin-bottom: 6px; }
.steps p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* Features */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.grid article { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 22px; }
.grid h3 { font-size: 1.05rem; margin-bottom: 8px; }
.grid p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* Pricing */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.plan { position: relative; background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 24px; display: flex; flex-direction: column; gap: 6px; }
.plan.featured { outline: 2px solid var(--accent); }
.plan .tag { position: absolute; top: -12px; left: 20px; background: var(--hi); color: #fff; font-size: 11.5px; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.plan h3 { font-size: 1.1rem; }
.plan .price { font-size: 1.9rem; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.plan .price small { font-size: 13px; font-weight: 500; color: var(--ink-faint); letter-spacing: 0; }
.plan .credits { color: var(--ink-soft); font-size: 13.5px; font-variant-numeric: tabular-nums; }
.plan p { margin: 10px 0 18px; color: var(--ink-soft); font-size: 14.5px; flex: 1; }
.plan p strong { color: var(--ink); }
.plan .btn { text-align: center; }
.topups { margin: 18px 0 0; padding: 14px 16px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; color: var(--ink-soft); font-size: 14.5px; }
.topups strong { color: var(--ink); }
.pricing-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 30px; }
.pricing-notes h4 { font-size: 14.5px; margin-bottom: 6px; }
.pricing-notes p { margin: 0; color: var(--ink-soft); font-size: 14px; }

/* App */
.app { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center; }
.app p { color: var(--ink-soft); max-width: 480px; margin: 12px 0 22px; }
.phone { justify-self: center; width: 230px; height: 440px; border-radius: 36px; background: var(--accent); padding: 12px; box-shadow: var(--shadow); }
.phone-screen { height: 100%; border-radius: 26px; background: var(--mock); padding: 18px 14px; display: flex; flex-direction: column; gap: 10px; font-size: 12.5px; }
.ph-title { font-weight: 800; text-align: center; margin-bottom: 8px; }
.ph-msg { align-self: flex-end; background: var(--accent); color: var(--accent-ink); padding: 8px 11px; border-radius: 12px 12px 4px 12px; max-width: 85%; }
.ph-msg.ai { align-self: flex-start; background: var(--mock-bg); color: var(--ink); border-radius: 12px 12px 12px 4px; }
.ph-input { margin-top: auto; border: 1px solid var(--border); border-radius: 12px; padding: 9px 12px; color: var(--ink-faint); }

/* FAQ */
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 700; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--ink-faint); font-size: 1.2rem; font-weight: 400; }
.faq details[open] summary::after { content: '−'; }
.faq p { margin: 10px 0 2px; color: var(--ink-soft); font-size: 14.5px; }

/* CTA */
.cta { text-align: center; background: var(--bg-2); border-radius: 24px; margin: 0 auto 72px !important; padding: 64px 24px !important; max-width: 992px !important; border-top: 1px solid var(--border) !important; }
.cta p { color: var(--ink-soft); margin: 8px 0 26px; }

/* Footer */
.bottom { border-top: 1px solid var(--border); padding: 44px 24px 36px; font-size: 14px; color: var(--ink-soft); }
.cols { max-width: 1040px; margin: 0 auto; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 28px; }
.cols h5 { font-size: 12.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 10px; }
.cols a { display: block; text-decoration: none; margin-bottom: 7px; }
.cols a:hover { color: var(--ink); text-decoration: underline; }
.cols p { margin: 10px 0 0; }
.copy { max-width: 1040px; margin: 30px auto 0; padding-top: 18px; border-top: 1px solid var(--border); font-size: 12.5px; color: var(--ink-faint); }

@media (max-width: 900px) {
  .hero, .app { grid-template-columns: 1fr; gap: 36px; padding-top: 48px; }
  .steps, .grid, .plans, .pricing-notes { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .cols { grid-template-columns: 1fr 1fr; }
  .menu { display: none; }
  main > section { padding: 56px 20px; }
}
@media (max-width: 560px) {
  .grid, .cols { grid-template-columns: 1fr; }
  .link { display: none; }
  .phone { width: 200px; height: 380px; }
}