/* SandboxMail v2 — Editorial Vertical Narrative
   Single centered column, maximum whitespace, minimal hairlines, muted clay accent.
   Ported from 方案2 + full-app component styles (TG modal, copy/loading states,
   refresh spin, error toast, inbox, reader, mobile). */

:root {
  --bg: #faf9f6;            /* warm off-white, never pure #fff */
  --ink: #272420;           /* warm dark text, not pure black */
  --ink-2: #635c52;         /* secondary text */
  --ink-3: #968d7f;         /* muted / meta */
  --line: #e8e6e0;          /* hairline (warm) */
  --line-strong: #ddd9d0;
  --accent: #a4624a;        /* muted clay / terracotta */
  --accent-ink: #8a4f3a;    /* darker clay for hover / links */
  --accent-wash: #f7ece7;   /* clay tint background */
  --ok: #6f8a63;            /* low-sat green status dot */
  --err: #b1503f;           /* low-sat error */
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius: 999px;
  --reading: 640px;
  --vh: 1vh;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.1px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3 { font-weight: 600; letter-spacing: -0.2px; color: var(--ink); }

.skip-link {
  position: absolute; left: 12px; top: -48px; z-index: 50;
  background: #fff; color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: 8px;
  padding: 8px 14px; transition: top .15s ease;
}
.skip-link:focus { top: 12px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

/* ---------- OKX promo bar (JS-injected; frame coordinates with the light theme, gold CTA for clicks) ---------- */
.okx-bar {
  display: flex; align-items: center; justify-content: center; gap: 14px;
  min-height: 42px; padding: 7px 18px; text-decoration: none;
  background: #fff; border-bottom: 1px solid var(--line-strong); color: var(--ink);
  font-family: var(--sans);
}
.okx-bar:hover { text-decoration: none; }
.okx-bar__logo { height: 15px; width: auto; flex: none; filter: brightness(0); opacity: 0.8; }
.okx-bar__txt { font-size: 0.86rem; color: var(--ink-2); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.okx-bar__txt b { color: var(--accent-ink); font-weight: 700; }
.okx-bar__cta {
  flex: none; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #ffd24d, #f5a300); color: #1a1206;
  font-weight: 800; font-size: 0.8rem; border-radius: 999px; padding: 6px 15px; white-space: nowrap;
  box-shadow: 0 2px 8px rgba(245, 163, 0, .28);
}
.okx-bar__cta::after {
  content: ""; position: absolute; top: 0; left: -80%; width: 55%; height: 100%; pointer-events: none;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .9), transparent);
  transform: skewX(-20deg); animation: okxShine 3s ease-in-out infinite;
}
@keyframes okxShine { 0%, 55% { left: -80%; } 80%, 100% { left: 160%; } }
.okx-bar:hover .okx-bar__cta { box-shadow: 0 3px 12px rgba(245, 163, 0, .42); }
.okx-bar__m { display: none; }
@media (max-width: 600px) {
  .okx-bar { gap: 10px; padding: 6px 14px; }
  .okx-bar__d { display: none; } .okx-bar__m { display: inline; }
  .okx-bar__cta { padding: 5px 12px; font-size: 0.78rem; }
}
@media (prefers-reduced-motion: reduce) { .okx-bar__cta::after { animation: none; } }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 920px; margin: 0 auto; padding: 22px 28px;
}
.brand { color: var(--ink); font-weight: 600; font-size: 1.05rem; letter-spacing: 0.2px; }
.brand:hover { text-decoration: none; }
.topnav { display: flex; align-items: center; gap: 22px; }
.topnav a { color: var(--ink-2); font-size: 0.95rem; }
.topnav a:hover { color: var(--ink); }
.topnav .switch-v1 { color: var(--ink-3); font-size: 0.86rem; }
.lang-toggle {
  font: inherit; font-size: 0.9rem; cursor: pointer;
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 5px 14px;
}
.lang-toggle:hover { color: var(--ink); border-color: var(--ink-3); }

/* ---------- reading column ---------- */
.reading { max-width: var(--reading); margin: 0 auto; padding: 0 28px; }
.reading__h2 { font-size: 1.05rem; text-transform: uppercase; letter-spacing: 0.6px; color: var(--ink-3); font-weight: 600; margin: 0 0 22px; }

.hero { padding: 64px 0 40px; }
.kicker { color: var(--accent-ink); font-size: 0.88rem; letter-spacing: 0.4px; text-transform: uppercase; margin: 0 0 18px; }
.hero h1 { font-size: clamp(2rem, 5.2vw, 2.9rem); line-height: 1.22; margin: 0 0 22px; }
.lede { font-size: 1.2rem; color: var(--ink-2); margin: 0; }

/* ---------- mailbox (inline composer) ---------- */
.mailbox { padding: 16px 0 8px; }
.mailbox__label { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--ink-3); margin: 0 0 12px; }

/* Telegram signifier — the one accented affordance, still flat + hairline */
.tg-cta {
  display: flex; align-items: center; gap: 14px; width: 100%; text-align: left;
  margin: 4px 0 8px; padding: 15px 18px; cursor: pointer; font: inherit; color: var(--ink);
  background: var(--accent-wash); border: 1px solid #ecd9cf; border-radius: 12px;
  transition: border-color .15s ease;
}
.tg-cta:hover { border-color: var(--accent); }
.tg-cta__icon {
  flex: none; width: 36px; height: 36px; border-radius: 50%;
  background: #fff; color: var(--accent); display: flex; align-items: center; justify-content: center;
}
.tg-cta__icon svg { width: 19px; height: 19px; }
.tg-cta__text { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.tg-cta__t { font-weight: 600; font-size: 0.98rem; }
.tg-cta__d { color: var(--ink-2); font-size: 0.88rem; line-height: 1.45; }
.tg-cta__arrow { color: var(--accent); font-size: 1.15rem; flex: none; }

.addr {
  font-family: var(--mono);
  font-size: clamp(1.1rem, 4.4vw, 1.55rem);
  color: var(--ink); margin: 0 0 12px; word-break: break-all; line-height: 1.4;
  cursor: pointer; display: inline-flex; align-items: center; gap: 10px;
}
.addr .copied-tick { color: var(--ok); opacity: 0; transition: opacity .15s ease; font-size: 0.9rem; }
.addr.copied .copied-tick { opacity: 1; }
.addr-meta { display: flex; align-items: center; gap: 8px; color: var(--ink-3); font-size: 0.95rem; margin: 0 0 24px; }
.addr-meta time { font-family: var(--mono); color: var(--ink-2); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); display: inline-block; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.btn {
  font: inherit; font-size: 0.95rem; cursor: pointer;
  background: #fff; color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 9px 18px;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
  display: inline-flex; align-items: center; gap: 7px;
}
.btn:hover { border-color: var(--ink-3); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn--primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn--primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn .spin { width: 14px; height: 14px; }

/* refresh spin */
.spin { animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.picker { margin-bottom: 22px; }
.picker--inline { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.picker__label { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.4px; color: var(--ink-3); margin: 0 0 12px; }
.picker--inline .picker__label { margin: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font: inherit; font-size: 0.9rem; cursor: pointer;
  background: #fff; color: var(--ink-2);
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 7px 14px;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.chip:hover { color: var(--ink); border-color: var(--ink-3); }
.chip.is-on { color: var(--accent-ink); border-color: var(--accent); background: var(--accent-wash); font-weight: 600; }
#styleSelect {
  font: inherit; font-size: 0.95rem; color: var(--ink);
  background: #fff; border: 1px solid var(--line-strong); border-radius: 8px; padding: 8px 12px;
}

/* ---------- inbox ---------- */
.inbox__head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.refresh-in { color: var(--ink-3); font-size: 0.8rem; font-family: var(--mono); white-space: nowrap; }
.inbox { padding: 44px 0 8px; }
.inbox__list { list-style: none; margin: 0; padding: 0; }
.mail {
  padding: 18px 0; border-top: 1px solid var(--line); cursor: pointer;
  transition: opacity .12s ease; animation: mailIn .4s ease both;
}
.mail:first-child { border-top: 0; }
.mail:hover { opacity: 0.74; }
.mail__top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.mail__from { font-weight: 600; font-size: 0.98rem; }
.mail__time { color: var(--ink-3); font-size: 0.84rem; white-space: nowrap; }
.mail__subj { display: block; color: var(--ink-2); font-size: 0.96rem; margin-top: 2px; }
.mail__preview { display: block; color: var(--ink-3); font-size: 0.88rem; margin-top: 4px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@keyframes mailIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.inbox__empty { padding: 8px 0 4px; }
.inbox__empty-t { font-weight: 600; margin: 0 0 6px; }
.inbox__empty-d { color: var(--ink-2); margin: 0; }

/* ---------- prose sections ---------- */
.prose { padding: 48px 0; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 26px; }
.steps li { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; }
.steps__n { font-family: var(--mono); color: var(--accent); font-size: 1.05rem; }
.steps h3 { font-size: 1.08rem; margin: 0 0 4px; }
.steps p { color: var(--ink-2); margin: 0; }

.defs { margin: 0; display: grid; gap: 26px; }
.defs dt { font-weight: 600; font-size: 1.05rem; margin-bottom: 4px; }
.defs dd { margin: 0; color: var(--ink-2); }

.uses { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.uses li { color: var(--ink); padding-left: 26px; position: relative; }
.uses li::before { content: ""; position: absolute; left: 2px; top: 0.72em; width: 10px; height: 1px; background: var(--accent); }

details { border-top: 1px solid var(--line); padding: 18px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 600; list-style: none; padding-right: 24px; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 2px; top: -1px; color: var(--ink-3); font-weight: 400; }
details[open] summary::after { content: "\2013"; }
details p { color: var(--ink-2); margin: 10px 0 0; }

/* ---------- footer ---------- */
.foot {
  max-width: var(--reading); margin: 0 auto; padding: 40px 28px 64px;
  border-top: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 8px;
}
.foot__links { display: flex; gap: 18px; margin-bottom: 4px; }
.foot__links a { color: var(--ink-3); font-size: 0.86rem; }
.foot__brand { font-weight: 600; }
.foot__small { color: var(--ink-3); font-size: 0.9rem; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(12px);
  background: var(--ink); color: #fff; font-size: 0.92rem; padding: 10px 18px; border-radius: 10px;
  opacity: 0; pointer-events: none; transition: opacity .2s ease, transform .2s ease; z-index: 3000;
  max-width: calc(100% - 32px);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.toast--error { background: var(--err); }

/* ---------- reader dialog ---------- */
.reader {
  border: 1px solid var(--line-strong); border-radius: 12px; padding: 0;
  max-width: 560px; width: calc(100% - 32px); color: var(--ink); background: #fff;
  max-height: 82vh;
}
.reader::backdrop { background: rgba(39, 36, 32, 0.32); }
.reader__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 22px 24px 14px; margin: 0; border-bottom: 1px solid var(--line); }
.reader__head h3 { font-size: 1.12rem; margin: 0; }
.reader__close { font: inherit; cursor: pointer; background: transparent; border: 0; color: var(--ink-3); font-size: 1.05rem; line-height: 1; padding: 2px 4px; }
.reader__close:hover { color: var(--ink); }
.reader__meta { padding: 12px 24px 0; color: var(--ink-3); font-size: 0.88rem; margin: 0; }
.reader__body { padding: 12px 24px 26px; white-space: pre-wrap; color: var(--ink-2); line-height: 1.75; overflow-y: auto; word-break: break-word; }
.reader__body img { max-width: 100%; height: auto; }

/* ---------- TG bind modal ---------- */
.modal {
  position: fixed; inset: 0; z-index: 2500; display: none;
  align-items: center; justify-content: center; padding: 16px;
  background: rgba(39, 36, 32, 0.32);
}
.modal.show { display: flex; }
.modal__panel {
  background: #fff; border: 1px solid var(--line-strong); border-radius: 14px;
  max-width: 460px; width: 100%; padding: 24px;
}
.modal__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.modal__head h3 { font-size: 1.12rem; margin: 0; }
.modal__close { font: inherit; cursor: pointer; background: transparent; border: 0; color: var(--ink-3); font-size: 1.1rem; }
.modal__close:hover { color: var(--ink); }
.modal__desc { color: var(--ink-2); margin: 0 0 14px; font-size: 0.96rem; }
.modal ol { margin: 0 0 16px; padding-left: 20px; color: var(--ink); }
.modal ol li { margin-bottom: 6px; }
.tg-cmd {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 14px; margin-bottom: 16px;
}
.tg-cmd code { font-family: var(--mono); color: var(--accent-ink); flex: 1; font-size: 0.92rem; word-break: break-all; }
.tg-cmd button { background: transparent; border: 0; cursor: pointer; color: var(--ink-3); padding: 2px; }
.tg-cmd button:hover { color: var(--accent-ink); }
.modal__foot { display: flex; justify-content: flex-end; }

/* ---------- responsive ---------- */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .topbar { padding: 18px 20px; }
  .topnav { gap: 12px; }
  .topnav a:not(.lang-toggle):not(.switch-v1) { display: none; }
  .reading { padding: 0 20px; }
  .foot { padding: 32px 20px 56px; }
  .hero { padding: 44px 0 28px; }
  .actions .btn { flex: 1 1 auto; justify-content: center; }
}

/* ---------- scroll reveal + live signals ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); }
.js .reveal.in { opacity: 1; transform: none; transition: opacity .6s ease, transform .6s ease; }

@media (prefers-reduced-motion: no-preference) {
  .dot { animation: pulse 2.6s ease-in-out infinite; }
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(111, 138, 99, 0.5); }
  50%      { box-shadow: 0 0 0 6px rgba(111, 138, 99, 0); }
}

/* ---------- motion: respect user preference ---------- */
@media (prefers-reduced-motion: reduce) {
  *, .mail, .spin, .dot { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
}