/* Probe — 跨境 AI 用户深访 / enterprise SaaS UI */
:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #fafbfc;
  --border: #e6e8ec;
  --border-strong: #d4d8df;
  --text: #131822;
  --text-2: #515b6b;
  --text-3: #8b94a3;
  --primary: #2456e6;
  --primary-hover: #1c45c2;
  --primary-soft: #eef2fe;
  --primary-border: #cfdcfb;
  --success: #0f7a55;
  --success-soft: #e7f6ef;
  --danger: #c5392c;
  --danger-soft: #fdeeec;
  --warning: #a25a08;
  --warning-soft: #fdf3e3;
  --neutral: #5b6472;
  --neutral-soft: #eef0f3;
  --radius: 10px;
  --radius-sm: 7px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);
  --shadow: 0 1px 3px rgba(16, 24, 40, .09), 0 1px 2px rgba(16, 24, 40, .05);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, .12), 0 2px 6px rgba(16, 24, 40, .06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; font-weight: 650; letter-spacing: -.01em; color: var(--text); }
p { margin: 0; }
.boot { padding: 80px; text-align: center; color: var(--text-3); }

/* ---------- layout ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  height: 58px; display: flex; align-items: center; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); cursor: pointer; }
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 28px; height: 28px; border-radius: 7px; flex: none;
  background: var(--primary); display: grid; place-items: center;
}
.brand .logo svg { width: 17px; height: 17px; }
.brand .name { font-size: 16px; }
.brand .name b { color: var(--primary); }
.topbar nav { display: flex; gap: 4px; margin-left: 6px; }
.topbar nav a {
  color: var(--text-2); padding: 6px 11px; border-radius: 7px; font-size: 14px; font-weight: 500;
}
.topbar nav a:hover { background: var(--neutral-soft); text-decoration: none; color: var(--text); }
.topbar nav a.active { color: var(--primary); background: var(--primary-soft); }
.topbar .spacer { flex: 1; }
.health {
  display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--text-2);
  padding: 5px 10px; border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
}
.health .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); }
.health.live .dot { background: var(--success); }
.health.mock .dot { background: var(--warning); }

.page { max-width: 1120px; margin: 0 auto; padding: 32px 24px 80px; }
.page-narrow { max-width: 880px; }

/* ---------- generic ---------- */
.muted { color: var(--text-2); }
.dim { color: var(--text-3); }
.row { display: flex; align-items: center; gap: 12px; }
.wrap { flex-wrap: wrap; }
.between { justify-content: space-between; }
.stack { display: flex; flex-direction: column; }
.mono { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  font-family: inherit; font-size: 14px; font-weight: 550; line-height: 1;
  padding: 10px 16px; border-radius: var(--radius-sm); border: 1px solid transparent;
  cursor: pointer; white-space: nowrap; transition: background .12s, border-color .12s, color .12s;
  background: var(--neutral-soft); color: var(--text);
}
.btn:hover { background: #e4e7ec; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { background: var(--neutral-soft); }
.btn-danger-ghost { background: transparent; border-color: transparent; color: var(--danger); padding: 6px 8px; }
.btn-danger-ghost:hover { background: var(--danger-soft); }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-lg { padding: 13px 22px; font-size: 15.5px; }
.btn-block { width: 100%; }

.input, .textarea, .select {
  font-family: inherit; font-size: 14.5px; color: var(--text);
  width: 100%; padding: 10px 12px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); background: var(--surface); transition: border-color .12s, box-shadow .12s;
}
.input:focus, .textarea:focus, .select:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
.textarea { resize: vertical; min-height: 92px; line-height: 1.5; }
.select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%23666' stroke-width='1.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; padding-right: 30px; }
.label { display: block; font-size: 13px; font-weight: 600; color: var(--text-2); margin-bottom: 7px; }
.field { margin-bottom: 18px; }
.hint { font-size: 12.5px; color: var(--text-3); margin-top: 6px; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
}
.card-pad { padding: 22px; }

.tag {
  display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 600;
  padding: 3px 9px; border-radius: 999px; background: var(--neutral-soft); color: var(--neutral);
  line-height: 1.4;
}
.tag-primary { background: var(--primary-soft); color: var(--primary); }
.tag-success { background: var(--success-soft); color: var(--success); }
.tag-warning { background: var(--warning-soft); color: var(--warning); }
.tag-danger { background: var(--danger-soft); color: var(--danger); }
.mkt-chip {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 600;
  padding: 3px 9px 3px 5px; border-radius: 999px; background: var(--surface-2);
  border: 1px solid var(--border); color: var(--text-2);
}
.mkt-chip .code {
  font-family: ui-monospace, monospace; font-size: 10.5px; font-weight: 700; letter-spacing: .03em;
  background: var(--text); color: #fff; border-radius: 4px; padding: 2px 5px;
}

.banner { padding: 12px 14px; border-radius: var(--radius-sm); font-size: 13.5px; }
.banner-error { background: var(--danger-soft); color: var(--danger); border: 1px solid #f3c9c3; }
.banner-info { background: var(--primary-soft); color: var(--primary-hover); border: 1px solid var(--primary-border); }

.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, .45); border-top-color: #fff;
  animation: spin .7s linear infinite; display: inline-block;
}
.spinner.dark { border-color: rgba(36, 86, 230, .25); border-top-color: var(--primary); }
@keyframes spin { to { transform: rotate(360deg); } }

.empty {
  text-align: center; padding: 56px 24px; color: var(--text-3);
  border: 1px dashed var(--border-strong); border-radius: var(--radius-lg); background: var(--surface-2);
}

/* ---------- landing ---------- */
.hero { padding: 72px 0 48px; }
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600;
  color: var(--primary); background: var(--primary-soft); border: 1px solid var(--primary-border);
  padding: 5px 12px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: 44px; line-height: 1.12; letter-spacing: -.02em; max-width: 14em; }
.hero .lede { font-size: 18px; color: var(--text-2); margin-top: 20px; max-width: 36em; line-height: 1.6; }
.hero .cta { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 12px; }
.feature {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 22px; box-shadow: var(--shadow-sm);
}
.feature .step { font-size: 12px; font-weight: 700; color: var(--primary); letter-spacing: .06em; }
.feature h3 { font-size: 16px; margin: 10px 0 8px; }
.feature p { font-size: 14px; color: var(--text-2); }
.moat {
  margin-top: 40px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: center;
  background: linear-gradient(180deg, #fbfcfe, #f4f7fd); border: 1px solid var(--primary-border);
  border-radius: var(--radius-lg); padding: 32px;
}
.moat h2 { font-size: 24px; }
.moat p { color: var(--text-2); margin-top: 12px; }
.moat-list { display: grid; gap: 10px; }
.moat-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; font-size: 13.5px; }
.moat-item b { color: var(--text); }

/* ---------- studio list ---------- */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.page-head h1 { font-size: 26px; }
.page-head .sub { color: var(--text-2); margin-top: 6px; }

.study-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 16px; }
.study-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 20px; box-shadow: var(--shadow-sm); cursor: pointer;
  transition: border-color .12s, box-shadow .12s, transform .12s; display: flex; flex-direction: column; gap: 12px;
}
.study-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.study-card h3 { font-size: 16.5px; }
.study-card .goal { font-size: 13.5px; color: var(--text-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.study-card .meta { display: flex; gap: 16px; font-size: 13px; color: var(--text-2); margin-top: auto; padding-top: 6px; border-top: 1px solid var(--border); }
.study-card .meta b { color: var(--text); font-weight: 650; }

/* ---------- wizard ---------- */
.wizard-steps { display: flex; align-items: center; gap: 0; margin-bottom: 28px; }
.wstep { display: flex; align-items: center; gap: 9px; color: var(--text-3); font-size: 13.5px; font-weight: 600; }
.wstep .num { width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; border: 1.5px solid var(--border-strong); font-size: 12.5px; background: var(--surface); }
.wstep.active { color: var(--primary); }
.wstep.active .num { border-color: var(--primary); background: var(--primary); color: #fff; }
.wstep.done { color: var(--success); }
.wstep.done .num { border-color: var(--success); background: var(--success); color: #fff; }
.wline { flex: 1; height: 1.5px; background: var(--border); margin: 0 14px; max-width: 70px; }

.market-picker { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.market-opt {
  display: flex; align-items: center; gap: 10px; padding: 11px 13px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); cursor: pointer; background: var(--surface); transition: border-color .12s, background .12s;
}
.market-opt:hover { border-color: var(--primary-border); }
.market-opt.sel { border-color: var(--primary); background: var(--primary-soft); }
.market-opt input { display: none; }
.market-opt .code { font-family: ui-monospace, monospace; font-size: 11px; font-weight: 700; background: var(--text); color: #fff; border-radius: 4px; padding: 3px 6px; }
.market-opt.sel .code { background: var(--primary); }
.market-opt .lbl { font-weight: 600; font-size: 14px; }
.market-opt .lang { font-size: 11.5px; color: var(--text-3); margin-left: auto; }

.clarify { background: var(--primary-soft); border: 1px solid var(--primary-border); border-radius: var(--radius); padding: 16px 18px; }
.clarify h4 { font-size: 13.5px; color: var(--primary-hover); margin-bottom: 10px; }
.clarify ol { margin: 0; padding-left: 20px; color: var(--text); }
.clarify li { margin: 5px 0; font-size: 14px; }

.outline-item {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; margin-bottom: 12px;
  background: var(--surface-2);
}
.outline-item .oi-head { display: flex; align-items: flex-start; gap: 10px; }
.outline-item .oi-num { width: 24px; height: 24px; flex: none; border-radius: 6px; background: var(--text); color: #fff; font-size: 12px; font-weight: 700; display: grid; place-items: center; margin-top: 8px; }
.outline-item .oi-body { flex: 1; }
.oi-controls { display: flex; gap: 12px; margin-top: 10px; align-items: flex-end; flex-wrap: wrap; }
.oi-controls .ctl { display: flex; flex-direction: column; gap: 5px; }
.oi-controls .ctl .label { margin: 0; }
.oi-controls .select { width: 140px; }
.depth-ctl { min-width: 200px; }
.depth-row { display: flex; align-items: center; gap: 10px; }
.depth-row input[type=range] { flex: 1; accent-color: var(--primary); }
.depth-val { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--primary); width: 14px; text-align: center; }
.choices-edit { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--border-strong); }
.choice-row { display: flex; gap: 8px; align-items: center; margin-bottom: 7px; }

.link-list { display: grid; gap: 10px; }
.link-row {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--surface-2);
}
.link-row .url { flex: 1; font-size: 13px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- study detail ---------- */
.detail-grid { display: grid; grid-template-columns: 1fr 320px; gap: 24px; align-items: start; }
.section { margin-bottom: 24px; }
.section > h2 { font-size: 17px; margin-bottom: 14px; display: flex; align-items: center; gap: 9px; }
.section .count-pill { font-size: 12px; font-weight: 600; color: var(--text-2); background: var(--neutral-soft); padding: 2px 8px; border-radius: 999px; }

.outline-read { display: grid; gap: 8px; }
.outline-read .oi {
  display: flex; gap: 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.outline-read .oi-num { width: 22px; height: 22px; flex: none; border-radius: 6px; background: var(--neutral-soft); color: var(--text-2); font-size: 12px; font-weight: 700; display: grid; place-items: center; }
.outline-read .oi-text { flex: 1; font-size: 14px; }
.outline-read .oi-meta { display: flex; gap: 6px; margin-top: 6px; }

.sessions-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.sessions-table th { text-align: left; font-size: 12px; font-weight: 600; color: var(--text-3); padding: 8px 10px; border-bottom: 1px solid var(--border); }
.sessions-table td { padding: 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.sessions-table tr:last-child td { border-bottom: none; }
.sessions-table .rid { font-family: ui-monospace, monospace; font-size: 12.5px; }
.live-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--success); margin-right: 6px; animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }

.stat-row { display: flex; gap: 12px; }
.stat { flex: 1; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.stat .n { font-size: 26px; font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.stat .l { font-size: 12.5px; color: var(--text-2); margin-top: 2px; }

.tool-card { margin-bottom: 16px; }
.tool-card h3 { font-size: 14.5px; margin-bottom: 4px; }
.tool-card p { font-size: 13px; color: var(--text-2); margin-bottom: 14px; }

/* ---------- report ---------- */
.report-overview { background: var(--surface-2); border: 1px solid var(--border); border-left: 3px solid var(--primary); border-radius: var(--radius); padding: 16px 18px; font-size: 14.5px; color: var(--text); line-height: 1.65; }
.report-q { margin-top: 24px; }
.report-q .qhead { font-size: 15px; font-weight: 650; margin-bottom: 4px; }
.report-q .qsub { font-size: 12.5px; color: var(--text-3); margin-bottom: 14px; }
.themes { display: grid; gap: 14px; }
.theme-card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); padding: 16px 18px; }
.theme-card .th-head { display: flex; align-items: center; gap: 10px; justify-content: space-between; }
.theme-card .th-title { font-size: 15px; font-weight: 650; }
.theme-card .th-summary { font-size: 13.5px; color: var(--text-2); margin: 9px 0 14px; line-height: 1.6; }
.prevalence { margin-bottom: 6px; }
.prev-bar { height: 8px; border-radius: 999px; background: var(--neutral-soft); overflow: hidden; }
.prev-fill { height: 100%; border-radius: 999px; background: var(--primary); transition: width .4s ease; }
.prev-fill.pos { background: var(--success); }
.prev-fill.neg { background: var(--danger); }
.prev-fill.mixed { background: var(--warning); }
.prev-fill.neutral { background: var(--neutral); }
.prev-label { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-2); margin-top: 7px; }
.prev-label b { color: var(--text); font-variant-numeric: tabular-nums; }

.quotes { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 6px; }
.quotes > summary {
  cursor: pointer; list-style: none; font-size: 13px; font-weight: 600; color: var(--primary);
  padding: 8px 0 4px; display: flex; align-items: center; gap: 6px;
}
.quotes > summary::-webkit-details-marker { display: none; }
.quotes > summary .chev { transition: transform .15s; }
.quotes[open] > summary .chev { transform: rotate(90deg); }
.quote {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; margin-top: 10px;
}
.quote .qtext { font-size: 13.5px; color: var(--text); line-height: 1.6; }
.quote .qtext::before { content: "“"; color: var(--text-3); }
.quote .qtext::after { content: "”"; color: var(--text-3); }
.quote .qmeta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 10px; font-size: 11.5px; color: var(--text-3); align-items: center; }
.quote .qmeta .k { color: var(--text-2); font-weight: 600; }
.quote .qmeta .rid { font-family: ui-monospace, monospace; }

.cross { margin-top: 16px; }
.cross-q { border: 1px solid var(--primary-border); border-radius: var(--radius); overflow: hidden; margin-bottom: 14px; }
.cross-q .cq-head { background: var(--primary-soft); padding: 12px 16px; font-size: 14px; font-weight: 650; color: var(--primary-hover); }
.cross-diffs { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.cross-diff { padding: 14px 16px; border-top: 1px solid var(--border); border-right: 1px solid var(--border); }
.cross-diff .cd-mkt { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.cross-diff p { font-size: 13px; color: var(--text-2); line-height: 1.6; }

/* ---------- respondent chat ---------- */
.chat-screen { min-height: 100dvh; display: flex; flex-direction: column; background: var(--bg); }
.chat-head {
  position: sticky; top: 0; z-index: 10; background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px)); padding-bottom: 12px;
}
.chat-head .ch-inner { max-width: 720px; margin: 0 auto; display: flex; align-items: center; gap: 12px; }
.chat-head .avatar { width: 38px; height: 38px; border-radius: 10px; background: var(--primary); display: grid; place-items: center; flex: none; }
.chat-head .avatar svg { width: 20px; height: 20px; }
.chat-head .ttl { font-size: 15px; font-weight: 650; }
.chat-head .sub { font-size: 12.5px; color: var(--text-2); }
.chat-progress { max-width: 720px; margin: 10px auto 0; }
.chat-progress .pbar { height: 4px; border-radius: 999px; background: var(--neutral-soft); overflow: hidden; }
.chat-progress .pfill { height: 100%; background: var(--primary); border-radius: 999px; transition: width .4s ease; }
.chat-progress .plabel { font-size: 11.5px; color: var(--text-3); margin-top: 5px; text-align: right; }

.chat-body { flex: 1; overflow-y: auto; }
.chat-msgs { max-width: 720px; margin: 0 auto; padding: 20px 16px; display: flex; flex-direction: column; gap: 14px; }
.msg { display: flex; gap: 10px; max-width: 86%; }
.msg .bubble { padding: 11px 14px; border-radius: 14px; font-size: 14.5px; line-height: 1.55; white-space: pre-wrap; word-break: break-word; }
.msg.interviewer { align-self: flex-start; }
.msg.interviewer .bubble { background: var(--surface); border: 1px solid var(--border); border-top-left-radius: 4px; color: var(--text); box-shadow: var(--shadow-sm); }
.msg.respondent { align-self: flex-end; flex-direction: row-reverse; }
.msg.respondent .bubble { background: var(--primary); color: #fff; border-top-right-radius: 4px; }
.msg .av { width: 30px; height: 30px; border-radius: 8px; flex: none; display: grid; place-items: center; font-size: 12px; font-weight: 700; }
.msg.interviewer .av { background: var(--primary-soft); color: var(--primary); }
.msg.respondent .av { background: #dbe3fb; color: var(--primary-hover); }
.typing .bubble { display: flex; gap: 4px; align-items: center; padding: 14px 16px; }
.typing .d { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); animation: blink 1.3s infinite both; }
.typing .d:nth-child(2) { animation-delay: .2s; }
.typing .d:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 60%, 100% { opacity: .25; } 30% { opacity: 1; } }

.chat-input {
  position: sticky; bottom: 0; background: var(--surface); border-top: 1px solid var(--border);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
}
.chat-input .ci-inner { max-width: 720px; margin: 0 auto; display: flex; gap: 10px; align-items: flex-end; }
.chat-input textarea {
  flex: 1; resize: none; max-height: 140px; min-height: 44px; padding: 11px 14px; font-size: 15px;
  border: 1px solid var(--border-strong); border-radius: 12px; font-family: inherit; line-height: 1.45;
}
.chat-input textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.chat-input .send { width: 44px; height: 44px; flex: none; border-radius: 12px; padding: 0; }

.thanks { max-width: 480px; margin: 0 auto; padding: 64px 24px; text-align: center; }
.thanks .check { width: 64px; height: 64px; border-radius: 50%; background: var(--success-soft); display: grid; place-items: center; margin: 0 auto 24px; }
.thanks .check svg { width: 32px; height: 32px; }
.thanks h2 { font-size: 22px; }
.thanks p { color: var(--text-2); margin-top: 12px; line-height: 1.6; }

.center-screen { min-height: 70vh; display: grid; place-items: center; text-align: center; padding: 24px; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .detail-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .moat { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
}
@media (max-width: 600px) {
  .page { padding: 20px 16px 64px; }
  .topbar nav { display: none; }
  .hero { padding: 44px 0 32px; }
  .hero h1 { font-size: 28px; }
  .oi-controls .select, .depth-ctl { width: 100%; }
  .study-grid { grid-template-columns: 1fr; }
}