:root {
  --bg: #f7f7f5; --panel: #ffffff; --ink: #17181a; --muted: #62656b; --line: #e4e4e0;
  --brand: #ff5a1f; --brand-ink: #ffffff; --brand-soft: #fff1eb; --user: #17181a; --user-ink: #ffffff;
  --warn: #8a5300; --warn-bg: #fff6e0; --radius: 14px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111214; --panel: #1a1b1e; --ink: #ececea; --muted: #9a9ca3; --line: #2a2c30;
          --brand-soft: #2b1a12; --user: #ececea; --user-ink: #111214; --warn: #ffcf70; --warn-bg: #2b2412; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--ink); font: 15px/1.55 var(--font); -webkit-font-smoothing: antialiased; }
[hidden] { display: none !important; }
a { color: inherit; }
.muted { color: var(--muted); }
.fine { font-size: 12.5px; color: var(--muted); margin: 8px 0 0; }
.center { text-align: center; }
.error { color: #d23a2b; min-height: 1.4em; margin: 10px 0 0; font-size: 14px; }

.btn { font: inherit; font-weight: 600; border: 1px solid var(--line); background: var(--panel); color: var(--ink);
       border-radius: 10px; padding: 10px 16px; cursor: pointer; text-decoration: none; display: inline-flex;
       align-items: center; justify-content: center; gap: 6px; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn.primary:hover { filter: brightness(1.05); }
.btn.ghost { border-color: transparent; background: transparent; color: var(--muted); }
.btn.block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.link { background: none; border: 0; color: var(--muted); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }
.icon-btn { background: none; border: 0; font-size: 20px; color: var(--ink); cursor: pointer; padding: 4px 8px; display: none; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand.small { font-size: 16px; margin: 4px 4px 14px; }
.logo { width: 30px; height: 30px; border-radius: 9px; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 800; }

/* Auth */
.auth { min-height: 100%; display: grid; place-items: center; padding: 24px 16px; }
.auth-card { width: 100%; max-width: 420px; background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 28px; }
.auth-card h1 { font-size: 26px; line-height: 1.2; margin: 20px 0 8px; letter-spacing: -0.01em; }
.tabs { display: flex; gap: 6px; margin: 20px 0 14px; background: var(--bg); padding: 4px; border-radius: 10px; }
.tab { flex: 1; font: inherit; font-weight: 600; font-size: 14px; border: 0; background: none; color: var(--muted); padding: 8px; border-radius: 8px; cursor: pointer; }
.tab.active { background: var(--panel); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.form { display: grid; gap: 12px; }
.form label { display: grid; gap: 5px; font-size: 13.5px; font-weight: 600; }
.form input:not([type=checkbox]), .opt-row select, .opt-row input {
  font: inherit; font-weight: 400; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); width: 100%; }
.form .check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; color: var(--muted); }
.form .check input { margin-top: 4px; }

/* App layout */
.app { display: grid; grid-template-columns: 270px 1fr; height: 100%; }
.sidebar { border-right: 1px solid var(--line); background: var(--panel); padding: 14px; display: flex; flex-direction: column; min-height: 0; }
.conv-list { flex: 1; overflow-y: auto; margin: 14px -6px; }
.conv { display: flex; align-items: center; gap: 6px; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.conv:hover, .conv.active { background: var(--bg); }
.conv .t { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv .m { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.conv .del { visibility: hidden; background: none; border: 0; color: var(--muted); cursor: pointer; font-size: 16px; }
.conv:hover .del { visibility: visible; }
.sidebar-foot { border-top: 1px solid var(--line); padding-top: 12px; display: grid; gap: 12px; }
.ep-card { display: grid; gap: 2px; text-decoration: none; background: var(--brand-soft); border-radius: 12px; padding: 12px; font-size: 13px; }
.ep-card span { color: var(--muted); }
.user-row { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); }

.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; height: 100%; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 12px 20px; border-bottom: 1px solid var(--line); }
.modes { display: inline-flex; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.mode { font: inherit; font-weight: 600; font-size: 14px; border: 0; background: none; color: var(--muted); padding: 6px 16px; border-radius: 8px; cursor: pointer; }
.mode.active { background: var(--ink); color: var(--bg); }
.modes.locked .mode:not(.active) { display: none; }
.usage { margin-left: auto; font-size: 13px; color: var(--muted); }

.thread { flex: 1; overflow-y: auto; padding: 24px 20px; }
.empty { max-width: 680px; margin: 8vh auto 0; text-align: center; }
.empty h2 { font-size: 28px; margin: 0 0 8px; letter-spacing: -0.01em; }
.starters { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin-top: 24px; text-align: left; }
.starter { font: inherit; font-size: 14px; text-align: left; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: pointer; color: var(--ink); }
.starter:hover { border-color: var(--brand); }

.msg { max-width: 760px; margin: 0 auto 18px; }
.msg.user .bubble { background: var(--user); color: var(--user-ink); margin-left: auto; max-width: 85%; border-radius: var(--radius) var(--radius) 4px var(--radius); padding: 10px 14px; white-space: pre-wrap; width: fit-content; }
.msg.assistant .bubble { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.bubble p { margin: 0 0 10px; } .bubble p:last-child { margin-bottom: 0; }
.bubble ul { margin: 0 0 10px; padding-left: 20px; }
.bubble blockquote { margin: 0 0 10px; padding-left: 12px; border-left: 3px solid var(--brand); color: var(--muted); }
.fw-note { font-size: 12.5px; color: var(--muted); margin: 0 0 8px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.actions .btn { padding: 6px 12px; font-size: 13px; }
.flag { background: var(--warn-bg); color: var(--warn); border-radius: 10px; padding: 10px 12px; font-size: 13px; margin-top: 10px; }
.typing::after { content: "\25CF"; animation: blink 1s infinite; margin-left: 2px; color: var(--brand); }
@keyframes blink { 50% { opacity: 0; } }

.composer { padding: 10px 20px 14px; border-top: 1px solid var(--line); background: var(--bg); }
.composer > * { max-width: 760px; margin-left: auto; margin-right: auto; }
.options summary { cursor: pointer; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.opt-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 10px; font-size: 12.5px; color: var(--muted); }
.opt-row label { display: grid; gap: 4px; }
.input-row { display: flex; gap: 10px; align-items: flex-end; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 8px; }
.input-row textarea { flex: 1; font: inherit; border: 0; resize: none; background: transparent; color: var(--ink); padding: 6px 8px; max-height: 240px; outline: none; }

.dialog { border: 1px solid var(--line); border-radius: 18px; padding: 24px; max-width: 400px; width: calc(100% - 32px); background: var(--panel); color: var(--ink); }
.dialog::backdrop { background: rgba(0,0,0,.45); }
.dialog h2 { margin: 0 0 8px; font-size: 21px; }
.dialog .btn { margin-top: 10px; }

@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: 82%; max-width: 300px; z-index: 10; transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { box-shadow: 0 0 40px rgba(0,0,0,.25); }
  .sidebar.open { transform: none; }
  .icon-btn { display: inline-block; }
  .topbar, .thread, .composer { padding-left: 16px; padding-right: 16px; }
  .opt-row { grid-template-columns: 1fr; }
  .usage { font-size: 12px; }
}

/* Vault (owner only) */
.vault { flex: 1; overflow-y: auto; padding: 20px; }
.vault > * { max-width: 860px; margin-left: auto; margin-right: auto; }
.vault-bar { display: grid; gap: 10px; margin-bottom: 14px; }
.vault-bar input[type=search] { font: inherit; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--ink); width: 100%; }
.vault-filters { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.vault-filters select { font: inherit; font-size: 13px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: var(--ink); width: 100%; }
.vault-list { display: grid; gap: 8px; }
.v-item { text-align: left; font: inherit; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: pointer; color: var(--ink); display: grid; gap: 4px; }
.v-item:hover { border-color: var(--brand); }
.v-item .s { font-weight: 600; }
.v-item .b, .v-item .n { font-size: 13px; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.chip { font-size: 12px; background: var(--brand-soft); border-radius: 999px; padding: 3px 10px; }
.vault-detail h2 { margin: 10px 0 4px; font-size: 22px; }
.vd-body { white-space: pre-wrap; font: inherit; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin-top: 12px; }
.modeling { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
@media (max-width: 820px) { .vault { padding: 16px; } .vault-filters { grid-template-columns: 1fr 1fr; } }

/* Client workspaces */
.ws { position: relative; margin: 0 0 12px; }
.ws-label { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 0 4px 6px; }
.ws-btn { width: 100%; display: flex; align-items: center; gap: 10px; font: inherit; font-weight: 600; text-align: left;
          padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); cursor: pointer; }
.ws-btn[aria-expanded=true] { border-color: var(--brand); }
.ws-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ws-caret { color: var(--muted); font-size: 12px; }
.ws-badge { flex: none; width: 26px; height: 26px; border-radius: 7px; display: grid; place-items: center; font-size: 11px; font-weight: 800; color: #fff; }
.ws-menu { position: absolute; z-index: 20; left: 0; right: 0; top: calc(100% + 4px); background: var(--panel); border: 1px solid var(--line);
           border-radius: 12px; padding: 6px; box-shadow: 0 10px 30px rgba(0,0,0,.18); max-height: 60vh; overflow-y: auto; }
.ws-menu .ws-label { margin: 10px 8px 4px; }
.ws-item { width: 100%; display: flex; align-items: center; gap: 10px; font: inherit; font-size: 14px; text-align: left; padding: 7px 8px;
           border: 0; border-radius: 8px; background: none; color: var(--ink); cursor: pointer; }
.ws-item:hover, .ws-item.active { background: var(--bg); }
.ws-item .ws-name { font-weight: 500; }
.ws-item .tick { color: var(--brand); font-weight: 800; }
.ws-item.add { color: var(--brand); font-weight: 600; }
.link.small { font-size: 12.5px; margin: 6px 4px 0; }
.dialog.wide { max-width: 520px; width: calc(100% - 32px); }
.form textarea { font: inherit; font-weight: 400; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px;
                 background: var(--bg); color: var(--ink); width: 100%; resize: vertical; }
.btn.danger { margin-left: auto; color: #d23a2b; border-color: transparent; background: transparent; }

/* Sales page (logged out) */
.landing { display: block; min-height: 100%; }
.hero { max-width: 1120px; margin: 0 auto; padding: 40px 16px 32px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(30px, 4.4vw, 46px); line-height: 1.08; letter-spacing: -0.02em; margin: 14px 0 14px; }
.lead { font-size: 17px; color: var(--muted); margin: 0 0 16px; }
.lead strong { color: var(--ink); }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--brand); margin: 18px 0 0; }
.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.ticks li { padding-left: 26px; position: relative; }
.ticks li::before { content: "\2713"; position: absolute; left: 0; top: 0; color: var(--brand); font-weight: 800; }
.hero .auth-card { max-width: none; }
.auth-card h2 { margin: 0; font-size: 22px; }
.stats { max-width: 1120px; margin: 0 auto 8px; padding: 0 16px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stats div { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 16px; display: grid; text-align: center; }
.stats strong { font-size: 28px; letter-spacing: -0.01em; color: var(--brand); }
.stats span { font-size: 13px; color: var(--muted); }
.band { padding: 48px 16px; }
.band.alt { background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.band-inner { max-width: 1040px; margin: 0 auto; }
.band h2 { font-size: clamp(24px, 3vw, 32px); line-height: 1.15; letter-spacing: -0.01em; margin: 6px 0 12px; }
.split { display: grid; grid-template-columns: 280px 1fr; gap: 36px; align-items: center; }
.proof-img { margin: 0; }
.proof-img img { display: block; width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); background: var(--bg); }
.proof-img.portrait img { aspect-ratio: 4 / 5; object-fit: cover; }
.proof-img figcaption { font-size: 13.5px; color: var(--muted); margin-top: 8px; }
.proof-img figcaption strong { color: var(--ink); }
.proof-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin: 22px 0; }
.before-after { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0; }
.ba { background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; gap: 4px; align-content: start; }
.ba strong { font-size: 36px; letter-spacing: -0.02em; }
.ba.after strong { color: var(--brand); }
.ba-label { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.ba .proof-img { margin-top: 10px; }
.niches { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 20px 0 26px; }
.niches span { background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; font-size: 14px; }
.dfy { background: var(--brand-soft); }
.dfy .btn { margin-top: 10px; padding: 14px 26px; font-size: 16px; }
.site-foot { text-align: center; font-size: 12.5px; color: var(--muted); padding: 24px 16px 32px; }
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 24px; padding-top: 24px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .split .proof-img.portrait { max-width: 240px; }
  .before-after { grid-template-columns: 1fr; }
}
.split:has(> .proof-img[hidden]) { grid-template-columns: 1fr; }
.proof-img.no-img { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.proof-img.no-img figcaption { margin: 0; font-size: 15px; color: var(--ink); }