:root {
  color-scheme: light;
  --ink: #16202a;
  --muted: #64717d;
  --line: #dce3e8;
  --paper: #ffffff;
  --wash: #f3f6f7;
  --green: #087f5b;
  --green-dark: #056348;
  --green-soft: #e7f5ef;
  --amber: #9c6500;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(8, 127, 91, .12), transparent 30rem),
    linear-gradient(180deg, #eef4f2 0, var(--wash) 24rem);
  min-height: 100vh;
}

.shell { width: min(1080px, calc(100% - 32px)); margin: 0 auto; padding: 56px 0 80px; }
.hero { padding: 24px 4px 42px; max-width: 760px; }
.eyebrow { display: block; color: var(--green); font-size: 12px; font-weight: 800; letter-spacing: .18em; }
h1 { margin: 10px 0 14px; font-size: clamp(38px, 6vw, 64px); line-height: 1.04; letter-spacing: -.045em; }
h2 { margin: 0 0 18px; font-size: 21px; letter-spacing: -.02em; }
p { color: var(--muted); line-height: 1.7; }
.hero > p { margin: 0; font-size: 17px; max-width: 680px; }
.status-row { display: flex; gap: 12px; align-items: center; margin-top: 24px; flex-wrap: wrap; }
.pill { border: 1px solid #bcd8ce; background: rgba(255,255,255,.72); color: var(--green-dark); padding: 8px 12px; border-radius: 99px; font-size: 13px; }
.open-chat { color: var(--green-dark); font-weight: 700; text-decoration: none; }

.card { background: rgba(255,255,255,.94); border: 1px solid rgba(205,216,222,.9); border-radius: 20px; box-shadow: 0 18px 45px rgba(28,52,45,.07); }
.privacy-card { display: flex; gap: 16px; padding: 20px 22px; margin-bottom: 22px; }
.privacy-card .icon { width: 34px; height: 34px; border-radius: 50%; flex: 0 0 auto; background: var(--green-soft); color: var(--green); display: grid; place-items: center; font-weight: 900; }
.privacy-card h2 { font-size: 16px; margin: 1px 0 3px; }
.privacy-card p { margin: 0; font-size: 14px; }
.grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); gap: 22px; align-items: start; }
.form-card, .guide-card, .bindings-card { padding: 28px; }
.form-card h2:not(:first-child) { margin-top: 30px; }
label { display: block; color: #34414b; font-size: 14px; font-weight: 700; margin-top: 16px; }
input { width: 100%; margin-top: 8px; border: 1px solid #cfd8de; border-radius: 11px; padding: 13px 14px; background: #fbfcfc; color: var(--ink); font: inherit; outline: none; }
input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(8,127,91,.12); background: #fff; }
.user-field { display: flex; align-items: center; margin-top: 8px; border: 1px solid #cfd8de; border-radius: 11px; background: #fbfcfc; overflow: hidden; }
.user-field:focus-within { border-color: var(--green); box-shadow: 0 0 0 3px rgba(8,127,91,.12); background: #fff; }
.user-field input { border: 0; box-shadow: none; margin: 0; background: transparent; min-width: 0; }
.user-field span { color: var(--muted); padding-right: 14px; font-size: 13px; white-space: nowrap; }
.provider-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.provider { position: relative; border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin: 0; cursor: pointer; transition: .18s ease; }
.provider input { position: absolute; width: 1px; height: 1px; margin: 0; opacity: 0; pointer-events: none; }
.provider.active { border-color: var(--green); background: var(--green-soft); box-shadow: inset 0 0 0 1px var(--green); }
.provider-name, .provider-note { display: block; }
.provider-name { color: var(--ink); font-size: 16px; }
.provider-note { color: var(--muted); font-size: 12px; font-weight: 500; margin-top: 3px; }
.help-box { background: #f6f8f8; border-radius: 12px; padding: 15px 16px; margin-top: 14px; font-size: 13px; }
.help-box ol { color: var(--muted); margin: 8px 0 0; padding-left: 21px; line-height: 1.8; }
code { background: #e9eeef; color: #284139; border-radius: 5px; padding: 2px 5px; overflow-wrap: anywhere; }
.warning { color: var(--amber); margin: 8px 0 0; font-size: 13px; }
.hidden { display: none !important; }
button { border: 0; border-radius: 11px; padding: 13px 16px; font: inherit; font-weight: 800; cursor: pointer; transition: .15s ease; }
button:disabled { opacity: .55; cursor: wait; }
.primary { width: 100%; background: var(--green); color: white; margin-top: 24px; }
.primary:hover { background: var(--green-dark); transform: translateY(-1px); }
.secondary { width: 100%; background: #e8edef; color: #34414b; margin-top: 10px; }
.message { min-height: 24px; margin: 12px 0 0; font-size: 14px; }
.message.error { color: #b42318; }
.message.success { color: var(--green); }
.guide-step { display: grid; grid-template-columns: 40px 1fr; gap: 12px; padding: 18px 0; border-top: 1px solid var(--line); }
.guide-step:first-of-type { border-top: 0; }
.guide-step > span { color: var(--green); font: 800 13px/1 monospace; padding-top: 3px; }
.guide-step strong { font-size: 15px; }
.guide-step p { margin: 5px 0 0; font-size: 13px; }
.bandwidth-note { margin-top: 16px; border-left: 3px solid var(--amber); background: #fff8e8; padding: 14px 16px; border-radius: 0 10px 10px 0; }
.bandwidth-note p { margin: 4px 0 0; font-size: 13px; }
.bindings-card { margin-top: 22px; }
.bindings-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.bindings-header h2 { margin: 5px 0 0; }
.text-button { background: transparent; color: var(--green); padding: 8px; }
.binding-list { display: grid; gap: 10px; margin-top: 20px; }
.binding-item { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: center; border: 1px solid var(--line); border-radius: 13px; padding: 15px 16px; }
.binding-title { font-weight: 800; }
.binding-meta { color: var(--muted); font-size: 13px; margin-top: 4px; }
.binding-actions { display: flex; gap: 8px; }
.binding-actions button { padding: 8px 11px; font-size: 12px; background: #e8edef; color: #34414b; }
.binding-actions .danger { color: #b42318; background: #fff0ef; }
.empty { color: var(--muted); text-align: center; padding: 24px; }

@media (max-width: 780px) {
  .shell { width: min(100% - 20px, 680px); padding-top: 28px; }
  .grid { grid-template-columns: 1fr; }
  .form-card, .guide-card, .bindings-card { padding: 22px 18px; }
  .provider-switch { grid-template-columns: 1fr; }
  .binding-item { grid-template-columns: 1fr; }
  .binding-actions { justify-content: flex-start; }
}