:root { --ink: #15181f; --muted: #667085; --line: #e4e7ec; --bg: #f5f6f8; --card: #fff; --accent: #1f2a44; --cust: #1f2a44; --cust-ink: #fff; --merch: #fff; --sys: #fff8e8; --danger: #b42318; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; color: var(--ink); background: var(--bg); }
a { color: inherit; }
.muted { color: var(--muted); } .small { font-size: .875rem; }
.top { display: flex; align-items: center; gap: 14px; padding: 14px 24px; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.3rem; letter-spacing: .03em; text-decoration: none; }
.tag { font-size: .8rem; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; }
.conn { margin-left: auto; font-size: .8rem; color: var(--muted); }
.conn.on::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: #12b76a; margin-right: 6px; }
.conn.off { color: var(--danger); }
.wrap { max-width: 860px; margin: 0 auto; padding: 24px 16px 48px; }
.gate { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px 28px; margin-bottom: 20px; }
.gate h1 { margin: 0 0 10px; font-size: 1.6rem; }
.notice { background: #fff4e5; border: 1px solid #ffd8a8; border-radius: 8px; padding: 12px 14px; }
.howto { padding-left: 20px; color: #344054; }
.howto li { margin: 4px 0; }
code { font-family: ui-monospace, Menlo, monospace; font-size: .85em; background: #f2f4f7; padding: 1px 5px; border-radius: 4px; }
.chat { background: var(--card); border: 1px solid var(--line); border-radius: 12px; display: flex; flex-direction: column; min-height: 420px; }
.messages { flex: 1; padding: 18px; display: flex; flex-direction: column; gap: 12px; overflow-y: auto; max-height: 70vh; }
.msg { max-width: 82%; padding: 10px 14px; border-radius: 12px; white-space: pre-wrap; word-wrap: break-word; }
.msg .who { font-size: .72rem; opacity: .7; margin-bottom: 2px; }
.msg.customer { align-self: flex-end; background: var(--cust); color: var(--cust-ink); }
.msg.merchant { align-self: flex-start; background: var(--merch); border: 1px solid var(--line); }
.msg.system { align-self: center; background: var(--sys); border: 1px solid #ffe3a3; font-size: .9rem; }
.att { margin-top: 10px; }
.after { margin-top: 10px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 8px; background: #fff; color: var(--ink); font-size: .85rem; }
.card img { width: 100%; border-radius: 6px; background: #f3f1ec; display: block; }
.card .n { font-weight: 600; margin-top: 6px; display: flex; justify-content: space-between; }
.card .d { color: var(--muted); font-size: .78rem; }
.proposal { border: 1px solid var(--line); border-radius: 10px; padding: 12px; background: #fafbfc; color: var(--ink); }
.proposal table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.proposal td { padding: 4px 2px; border-bottom: 1px solid var(--line); }
.proposal td.r { text-align: right; white-space: nowrap; }
.proposal tr.total td { font-weight: 700; border-bottom: 0; }
.proposal .state { font-size: .8rem; color: var(--muted); margin-top: 6px; }
.pay { margin-top: 12px; display: grid; gap: 10px; }
.pay fieldset { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px 2px; margin: 0; }
.pay legend { font-size: .85rem; font-weight: 600; padding: 0 4px; }
.pay label { display: block; font-size: .8rem; color: var(--muted); margin-bottom: 8px; }
.pay label.check { display: flex; align-items: center; gap: 8px; color: var(--ink); }
.pay input:not([type=checkbox]), .pay select { display: block; width: 100%; margin-top: 3px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; font: inherit; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
.err { display: block; color: var(--danger); font-size: .75rem; min-height: 1em; }
.pay button { padding: 10px 16px; border: 0; border-radius: 6px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
.pay button[disabled] { opacity: .6; }
.form-error { color: var(--danger); font-size: .85rem; margin: 0; }
.order { border: 1px solid #a6e3b8; background: #ecfdf3; border-radius: 10px; padding: 12px; color: var(--ink); }
.composer { display: flex; gap: 10px; padding: 12px; border-top: 1px solid var(--line); }
.composer textarea { flex: 1; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; resize: vertical; }
.composer button { padding: 10px 18px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
.composer button[disabled], .composer textarea[disabled] { opacity: .6; }
.status { padding: 0 14px 10px; margin: 0; min-height: 1.2em; }
.foot { text-align: center; color: var(--muted); font-size: .8rem; padding: 16px; }
@media (max-width: 640px) { .msg { max-width: 94%; } .row3 { grid-template-columns: 1fr; } .gate { padding: 18px; } }