:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface2: #191923;
  --border: #25252f;
  --text: #f3f3f7;
  --muted: #a1a1b5;
  --accent: #ff4d6d;
  --accent2: #ffb347;
  --ok: #34d399;
  --radius: 14px;
  --grad: linear-gradient(135deg, #ff4d6d 0%, #ffb347 100%);
  --shadow: 0 24px 60px -30px rgba(0,0,0,.8);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(1000px 520px at 8% -8%, rgba(255,77,109,.14), transparent 60%),
    radial-gradient(800px 460px at 104% 6%, rgba(255,179,71,.09), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
main { flex: 1; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(160%) blur(12px);
  background: rgba(10,10,15,.72);
  border-bottom: 1px solid var(--border);
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; height: 66px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 1.12rem; color: var(--text); letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px; background: var(--grad);
  display: grid; place-items: center; color: #0a0a0f; font-weight: 900; font-size: .98rem;
  box-shadow: 0 6px 20px -6px rgba(255,77,109,.7);
}
.topnav { display: flex; gap: 6px; }
.topnav a { color: var(--muted); font-size: .93rem; font-weight: 500; padding: 8px 14px; border-radius: 10px; }
.topnav a:hover, .topnav a.current { color: var(--text); background: var(--surface2); text-decoration: none; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 64px; text-align: center; position: relative; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px; opacity: .35;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: .78rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase;
  color: var(--accent2); border: 1px solid rgba(255,179,71,.3); background: rgba(255,179,71,.06); padding: 7px 14px; border-radius: 999px; margin-bottom: 26px;
}
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent2); }
.hero h1 {
  font-size: clamp(2.3rem, 5.6vw, 4rem); font-weight: 850; letter-spacing: -.035em; line-height: 1.06; margin-bottom: 20px;
}
.gradient-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); font-size: 1.12rem; max-width: 640px; margin: 0 auto; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 34px; }
.btn-primary {
  display: inline-block; background: var(--grad); color: #0a0a0f; font-weight: 700;
  padding: 14px 26px; border-radius: 12px; box-shadow: 0 12px 36px -12px rgba(255,77,109,.65);
}
.btn-primary:hover { text-decoration: none; transform: translateY(-1px); }
.btn-ghost {
  display: inline-block; color: var(--text); font-weight: 600; padding: 14px 26px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--surface);
}
.btn-ghost:hover { text-decoration: none; border-color: #3a3a48; }

/* ---------- Sections ---------- */
section.block { padding: 40px 0 16px; }
.section-head { margin-bottom: 26px; }
.eyebrow-small { font-size: .78rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--accent2); margin-bottom: 8px; display: block; }
.section-head h2 { font-size: 1.75rem; letter-spacing: -.025em; }
.section-head p { color: var(--muted); margin-top: 6px; }

/* ---------- Tool cards ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: 18px; }
.card {
  position: relative; display: flex; flex-direction: column; gap: 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; color: var(--text); overflow: hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .25s ease; pointer-events: none;
  background: radial-gradient(420px 180px at 0% 0%, rgba(255,77,109,.14), transparent 70%);
}
.card:hover { transform: translateY(-3px); border-color: rgba(255,77,109,.45); box-shadow: var(--shadow); text-decoration: none; }
.card:hover::before { opacity: 1; }
.card-icon {
  width: 48px; height: 48px; border-radius: 13px; background: var(--surface2); border: 1px solid var(--border);
  display: grid; place-items: center; color: var(--accent2);
}
.card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: 1.08rem; letter-spacing: -.01em; margin-top: 4px; }
.card p { color: var(--muted); font-size: .93rem; }
.card-foot { margin-top: auto; padding-top: 10px; display: flex; justify-content: space-between; align-items: center; font-size: .8rem; color: var(--muted); }
.chip { font-size: .74rem; font-weight: 600; color: var(--muted); background: var(--surface2); border: 1px solid var(--border); padding: 3px 10px; border-radius: 999px; }
.card-foot .open { color: var(--accent); font-weight: 600; }

/* ---------- Guides teaser ---------- */
.teaser { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.teaser a {
  display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px 22px; color: var(--text);
  transition: border-color .2s ease, transform .2s ease;
}
.teaser a:hover { border-color: rgba(255,179,71,.5); transform: translateY(-2px); text-decoration: none; }
.teaser .cat { font-size: .74rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--accent2); }
.teaser strong { display: block; margin-top: 6px; font-size: 1rem; }
.teaser span { display: block; color: var(--muted); font-size: .9rem; margin-top: 4px; }

/* ---------- Ads ---------- */
.ad-slot {
  margin: 40px auto; min-height: 100px; border: 1px dashed #34343f; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center; color: #5a5a6b; font-size: .82rem; letter-spacing: .02em;
}

/* ---------- Page heads (tool/inner pages) ---------- */
.page-head { padding: 56px 0 12px; }
.crumbs { color: var(--muted); font-size: .86rem; margin-bottom: 16px; }
.crumbs a { color: var(--muted); }
.page-head h1 { font-size: clamp(2rem, 4.2vw, 2.7rem); font-weight: 850; letter-spacing: -.03em; line-height: 1.12; margin-bottom: 12px; }
.page-head .lead { margin: 0; text-align: left; max-width: 720px; }

/* ---------- Panels & forms ---------- */
.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; margin: 26px 0; box-shadow: var(--shadow);
}
.how {
  background: var(--surface2); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 18px; margin-bottom: 24px;
}
.how summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 8px; }
.how summary::before { content: "＋"; color: var(--accent2); font-weight: 700; }
.how[open] summary::before { content: "−"; }
.how ol { margin: 12px 0 0 22px; color: var(--muted); font-size: .95rem; }
.how li { margin-bottom: 6px; }
.how code { color: var(--text); background: #07070b; padding: 1px 6px; border-radius: 5px; font-size: .9em; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 18px; }
label { display: block; font-size: .87rem; color: var(--muted); margin-bottom: 7px; font-weight: 500; }
input, select, textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface2); color: var(--text); font: inherit; transition: border-color .15s ease;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255,77,109,.18); }
textarea { min-height: 150px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .92rem; }

.result { margin-top: 26px; padding-top: 24px; border-top: 1px solid var(--border); }
.result-label { color: var(--muted); font-size: .88rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }
.result-big {
  font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 850; letter-spacing: -.025em; margin-top: 6px;
  background: linear-gradient(135deg, var(--ok), #7ee8c4); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.muted { color: var(--muted); font-size: .93rem; margin-top: 8px; }
.note { font-size: .88rem; color: var(--muted); margin-top: 20px; background: var(--surface2); border-left: 3px solid var(--accent); padding: 12px 14px; border-radius: 0 10px 10px 0; }
.warn { color: #ffd27a; font-size: .9rem; margin-top: 10px; }

.btn {
  display: inline-block; margin-top: 16px; background: var(--grad); color: #0a0a0f; border: 0;
  padding: 12px 20px; border-radius: 10px; font: inherit; font-weight: 700; cursor: pointer;
  transition: opacity .15s ease, transform .15s ease;
}
.btn:hover { opacity: .92; transform: translateY(-1px); }

pre {
  background: #07070b; border: 1px solid var(--border); border-radius: 12px; padding: 18px;
  overflow-x: auto; font-size: .9rem; margin-top: 14px; white-space: pre-wrap; word-break: break-all;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace; line-height: 1.55;
}

table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: 13px 14px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; background: var(--surface2); }
tbody tr:hover td { background: rgba(255,255,255,.015); }
.table-wrap { overflow-x: auto; border-radius: 12px; border: 1px solid var(--border); }
.table-wrap table { border: 0; }

/* ---------- Guides page ---------- */
.guides-layout { display: grid; grid-template-columns: 240px 1fr; gap: 48px; padding: 28px 0 40px; align-items: start; }
.toc { position: sticky; top: 96px; display: grid; gap: 22px; }
.toc h4 { font-size: .75rem; text-transform: uppercase; letter-spacing: .09em; color: var(--accent2); margin-bottom: 8px; font-weight: 700; }
.toc a { display: block; color: var(--muted); font-size: .92rem; padding: 5px 10px; border-left: 2px solid var(--border); }
.toc a:hover { color: var(--text); border-left-color: var(--accent); text-decoration: none; }
.guide { padding: 30px 0; border-bottom: 1px solid var(--border); scroll-margin-top: 90px; }
.guide:last-child { border-bottom: 0; }
.guide .gcat { font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .09em; color: var(--accent2); }
.guide h2 { font-size: 1.5rem; letter-spacing: -.02em; margin: 8px 0 10px; line-height: 1.25; }
.guide .gmeta { color: var(--muted); font-size: .84rem; margin-bottom: 14px; }
.guide p { color: #d6d6e2; margin-bottom: 14px; }
.guide h3 { font-size: 1.05rem; margin: 18px 0 8px; }
.guide ol, .guide ul { margin: 0 0 14px 22px; color: #d6d6e2; }
.guide li { margin-bottom: 7px; }
.guide .tip { background: var(--surface2); border-left: 3px solid var(--ok); padding: 12px 14px; border-radius: 0 10px 10px 0; color: var(--muted); font-size: .93rem; margin-top: 14px; }

/* ---------- About ---------- */
.about { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); }
.about p { color: #d6d6e2; margin-bottom: 12px; }
.social-links { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }
.social-links a {
  background: var(--surface2); border: 1px solid var(--border); padding: 9px 16px; border-radius: 10px; color: var(--text); font-size: .9rem; font-weight: 500;
}
.social-links a:hover { border-color: rgba(255,77,109,.5); text-decoration: none; }

/* ---------- Legal ---------- */
.legal { max-width: 800px; }
.legal h2 { font-size: 1.2rem; margin: 30px 0 10px; letter-spacing: -.01em; }
.legal p, .legal li { color: #d6d6e2; margin-bottom: 10px; }
.legal ul { margin-left: 22px; }
.legal .updated { color: var(--muted); font-size: .88rem; margin-bottom: 18px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); margin-top: 72px; padding: 56px 0 36px; background: rgba(0,0,0,.25); }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; }
.foot-grid h4 { font-size: .78rem; text-transform: uppercase; letter-spacing: .09em; color: var(--text); margin-bottom: 14px; font-weight: 700; }
.foot-grid ul { list-style: none; display: grid; gap: 9px; }
.foot-grid ul a { color: var(--muted); font-size: .92rem; }
.foot-grid ul a:hover { color: var(--text); }
.foot-brand p { color: var(--muted); font-size: .92rem; margin-top: 12px; max-width: 320px; }
.disclosure { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; }
.copy { color: #6d6d80; font-size: .82rem; margin-top: 10px; }

@media (max-width: 900px) {
  .guides-layout { grid-template-columns: 1fr; gap: 24px; }
  .toc { position: static; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .topnav a { padding: 7px 9px; font-size: .85rem; }
  .hero { padding: 64px 0 44px; }
  .panel { padding: 22px; }
  .foot-grid { grid-template-columns: 1fr; }
  .brand span:last-child { display: none; }
}

/* ---------- Banner IA ---------- */
.ia-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap;
  padding: 34px 38px; border-radius: 20px; color: var(--text); position: relative; overflow: hidden;
  background: linear-gradient(var(--surface), var(--surface)) padding-box, var(--grad) border-box;
  border: 1px solid transparent; box-shadow: 0 24px 60px -30px rgba(255,77,109,.55);
  transition: transform .2s ease, box-shadow .2s ease;
}
.ia-banner:hover { transform: translateY(-3px); text-decoration: none; box-shadow: 0 30px 70px -30px rgba(255,77,109,.7); }
.ia-banner h2 { font-size: 1.6rem; letter-spacing: -.02em; margin: 6px 0 8px; }
.ia-banner p { color: var(--muted); max-width: 560px; }
.ia-banner .btn-primary { white-space: nowrap; }
@media (max-width: 640px) { .ia-banner { padding: 26px 22px; } }