/* ez-ads public site (landing / login / signup) — self-contained, no CDN deps. */
:root {
  --bg: #0b1020;
  --bg2: #101735;
  --card: #131b3a;
  --line: rgba(255, 255, 255, 0.09);
  --text: #e8ecf8;
  --muted: #93a0c4;
  --brand: #6d8bff;
  --brand2: #9f6dff;
  --ok: #37d39a;
  --err: #ff7a8a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, "Segoe UI", Roboto, sans-serif;
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(159, 109, 255, 0.22), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(109, 139, 255, 0.20), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* Header */
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.logo { font-size: 22px; font-weight: 800; letter-spacing: 0.5px; color: var(--text); }
.logo b { background: linear-gradient(90deg, var(--brand), var(--brand2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.logo small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); letter-spacing: 2px; }
.topnav { display: flex; gap: 10px; align-items: center; }

/* Buttons */
.btn {
  display: inline-block; padding: 10px 22px; border-radius: 10px; border: 1px solid var(--line);
  color: var(--text); font-size: 15px; cursor: pointer; background: rgba(255, 255, 255, 0.05);
  transition: all 0.15s ease;
}
.btn:hover { text-decoration: none; border-color: rgba(255, 255, 255, 0.25); background: rgba(255, 255, 255, 0.09); }
.btn.primary {
  background: linear-gradient(90deg, var(--brand), var(--brand2));
  border: none; font-weight: 600; color: #fff;
  box-shadow: 0 6px 24px rgba(109, 139, 255, 0.35);
}
.btn.primary:hover { filter: brightness(1.08); }
.btn.big { padding: 14px 34px; font-size: 17px; border-radius: 12px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
button.btn { font-family: inherit; }

/* Hero */
.hero { padding: 70px 0 40px; text-align: center; }
.hero h1 { font-size: clamp(30px, 5vw, 52px); font-weight: 800; line-height: 1.25; }
.hero h1 .grad { background: linear-gradient(90deg, var(--brand), var(--brand2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.sub { max-width: 720px; margin: 18px auto 0; color: var(--muted); font-size: clamp(15px, 2vw, 18px); }
.hero .cta { margin-top: 34px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.badges { margin-top: 26px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.badge {
  font-size: 13px; color: var(--muted); border: 1px solid var(--line);
  padding: 5px 14px; border-radius: 999px; background: rgba(255, 255, 255, 0.04);
}
.badge.live { color: var(--ok); border-color: rgba(55, 211, 154, 0.35); }

/* Sections */
.section { padding: 46px 0; }
.section h2 { font-size: 26px; text-align: center; margin-bottom: 8px; }
.section p.lead { text-align: center; color: var(--muted); max-width: 640px; margin: 0 auto 34px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px;
}
.card .ico { font-size: 26px; }
.card h3 { font-size: 17px; margin: 10px 0 6px; }
.card p { color: var(--muted); font-size: 14px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; counter-reset: step; }
.step { background: rgba(255, 255, 255, 0.03); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.step .num {
  width: 30px; height: 30px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(90deg, var(--brand), var(--brand2)); font-weight: 700; font-size: 14px; margin-bottom: 12px; color: #fff;
}
.step h4 { font-size: 15px; margin-bottom: 4px; }
.step p { color: var(--muted); font-size: 13px; }

/* Platforms */
.platforms { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.platform {
  border: 1px solid var(--line); border-radius: 12px; padding: 14px 24px; min-width: 170px;
  background: rgba(255, 255, 255, 0.03); text-align: center;
}
.platform b { display: block; font-size: 16px; }
.platform span { font-size: 12px; color: var(--muted); }
.platform.on { border-color: rgba(55, 211, 154, 0.4); }
.platform.on span { color: var(--ok); }

/* CTA band */
.ctaband {
  margin: 30px 0 10px; text-align: center; border-radius: 18px; padding: 44px 24px;
  background: linear-gradient(90deg, rgba(109, 139, 255, 0.16), rgba(159, 109, 255, 0.16));
  border: 1px solid var(--line);
}
.ctaband h2 { font-size: 24px; margin-bottom: 8px; }
.ctaband p { color: var(--muted); margin-bottom: 22px; }

footer { padding: 34px 0 44px; text-align: center; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); margin-top: 40px; }

/* Auth pages (login / signup) */
.auth-wrap { min-height: calc(100vh - 90px); display: flex; align-items: center; justify-content: center; padding: 30px 16px 60px; }
.auth-card { width: 100%; max-width: 420px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 32px; }
.auth-card h1 { font-size: 22px; margin-bottom: 4px; }
.auth-card p.hint { color: var(--muted); font-size: 13px; margin-bottom: 22px; }
.auth-card label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 6px; }
.auth-card input {
  width: 100%; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05); color: var(--text); font-size: 15px; outline: none;
}
.auth-card input:focus { border-color: var(--brand); }
.auth-card .btn { width: 100%; margin-top: 22px; }
.auth-card .foot { margin-top: 18px; font-size: 13px; color: var(--muted); text-align: center; }
.msg-err { color: var(--err); font-size: 13px; margin-top: 12px; white-space: pre-wrap; }
.tabs { display: flex; gap: 8px; margin-bottom: 6px; }
.tabs .tab {
  flex: 1; text-align: center; padding: 8px; font-size: 13px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); color: var(--muted); background: transparent;
}
.tabs .tab.active { color: var(--text); border-color: var(--brand); background: rgba(109, 139, 255, 0.12); }

/* Signup success panel */
.success-panel { display: none; }
.success-panel .ok-title { color: var(--ok); font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.kv { margin: 12px 0; }
.kv .k { font-size: 12px; color: var(--muted); }
.kv .v {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px;
  background: rgba(0, 0, 0, 0.35); border: 1px solid var(--line); border-radius: 8px;
  padding: 9px 11px; margin-top: 4px; word-break: break-all; user-select: all;
}
.warn { font-size: 13px; color: #ffcf87; background: rgba(255, 207, 135, 0.08); border: 1px solid rgba(255, 207, 135, 0.25); border-radius: 10px; padding: 10px 12px; margin-top: 14px; }

/* Tutorial page (/tutorial) */
.navlink { color: var(--muted); font-size: 15px; padding: 10px 6px; }
.navlink:hover { color: var(--text); text-decoration: none; }
.tut-hero { padding: 46px 0 26px; text-align: center; }
.tut-hero h1 { font-size: clamp(26px, 4vw, 40px); font-weight: 800; line-height: 1.3; }
.tut-hero h1 .grad { background: linear-gradient(90deg, var(--brand), var(--brand2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.tut-hero p.sub { max-width: 700px; margin: 14px auto 0; color: var(--muted); font-size: clamp(14px, 2vw, 17px); }

.tut-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 34px; align-items: start; padding: 20px 0 30px; }
.toc { position: sticky; top: 24px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255, 255, 255, 0.03); padding: 14px 8px; }
.toc .toc-title { font-size: 12px; letter-spacing: 2px; color: var(--muted); padding: 2px 12px 8px; }
.toc a { display: block; font-size: 13px; color: var(--muted); padding: 7px 12px; border-radius: 8px; border-left: 2px solid transparent; }
.toc a:hover { color: var(--text); text-decoration: none; background: rgba(255, 255, 255, 0.05); }
.toc a.active { color: var(--text); background: rgba(109, 139, 255, 0.12); border-left-color: var(--brand); }

.tut-main { min-width: 0; }
.chapter { padding: 26px 0 10px; scroll-margin-top: 20px; }
.chapter + .chapter { border-top: 1px solid var(--line); margin-top: 18px; }
.chapter h2 { font-size: 21px; line-height: 1.4; margin-bottom: 14px; display: flex; align-items: center; gap: 12px; }
.chapter h2 .chip {
  flex: none; font-size: 13px; font-weight: 700; color: #fff; padding: 3px 10px; border-radius: 8px;
  background: linear-gradient(90deg, var(--brand), var(--brand2));
}
.chapter p { color: var(--text); font-size: 15px; margin-bottom: 14px; }
.chapter p b, .chapter li b { color: #fff; }
.fig { margin: 18px 0; }
.fig img {
  width: 100%; height: auto; display: block; border-radius: 14px;
  border: 1px solid var(--line); box-shadow: 0 10px 34px rgba(0, 0, 0, 0.35);
}
.fig figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; text-align: center; }
.kpoints { list-style: none; margin: 14px 0 6px; }
.kpoints li {
  position: relative; padding: 9px 0 9px 26px; color: var(--muted); font-size: 14px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}
.kpoints li:last-child { border-bottom: none; }
.kpoints li::before { content: "◆"; position: absolute; left: 4px; top: 9px; font-size: 11px; color: var(--brand); }
.pitfalls { display: grid; gap: 10px; margin: 16px 0 6px; }
.pit {
  font-size: 14px; color: var(--muted); padding: 12px 14px; border-radius: 10px;
  background: rgba(255, 122, 138, 0.06); border: 1px solid rgba(255, 122, 138, 0.22);
}
.pit b { color: var(--err); }
.chapter .ctaband { margin-top: 26px; }

@media (max-width: 640px) {
  .topbar { gap: 10px; }
  .topnav { gap: 6px; }
  .topnav .btn { padding: 8px 12px; font-size: 13px; white-space: nowrap; }
  .navlink { font-size: 13px; padding: 8px 2px; white-space: nowrap; }
}
@media (max-width: 860px) {
  .tut-layout { grid-template-columns: 1fr; gap: 18px; }
  .toc { position: static; display: flex; flex-wrap: wrap; gap: 4px; padding: 10px; }
  .toc .toc-title { display: none; }
  .toc a { border-left: none; border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; font-size: 12px; }
  .toc a.active { border-color: var(--brand); }
}