/* ---------- design tokens ---------- */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f0f2f8;
  --text: #1b1f2e;
  --muted: #5f6680;
  --border: #e1e4ee;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eceafe;
  --on-primary: #ffffff;
  --accent: #0f9d76;
  --accent-soft: #e2f6ef;
  --warn: #b45309;
  --warn-soft: #fef3e2;
  --danger: #c62f3b;
  --danger-soft: #fde8ea;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 4px 16px rgba(20, 24, 40, .06);
  --shadow-lg: 0 12px 40px rgba(20, 24, 40, .18);
  --radius: 14px;
  --radius-sm: 9px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11131b;
    --surface: #1a1d28;
    --surface-2: #232736;
    --text: #e8eaf2;
    --muted: #9aa1b9;
    --border: #2e3345;
    --primary: #8b85ff;
    --primary-hover: #a19cff;
    --primary-soft: #2a2950;
    --on-primary: #11131b;
    --accent: #3ccf9f;
    --accent-soft: #163a30;
    --warn: #f0b056;
    --warn-soft: #3a2c16;
    --danger: #ff7b86;
    --danger-soft: #3d1d22;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, .5);
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body.modal-open { overflow: hidden; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .4em; }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); letter-spacing: -.02em; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 .75em; }
a { color: var(--primary); }
a:hover { color: var(--primary-hover); }
img { max-width: 100%; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
main:focus { outline: none; }

.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
main.container { flex: 1; padding-top: 28px; padding-bottom: 56px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 100; }
.skip-link:focus { left: 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45em;
  min-height: 42px; padding: 0 18px;
  font: inherit; font-weight: 600; font-size: .95rem; text-decoration: none; white-space: nowrap;
  border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.primary:hover { background: var(--primary-hover); color: var(--on-primary); }
.btn.secondary { background: var(--primary-soft); color: var(--primary); }
.btn.secondary:hover { border-color: var(--primary); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn.ghost:hover { background: var(--surface-2); }
.btn.danger { color: var(--danger); }
.btn.danger-solid { background: var(--danger); color: #fff; }
.btn.sm { min-height: 36px; padding: 0 14px; font-size: .875rem; }
.btn.lg { min-height: 50px; padding: 0 28px; font-size: 1.05rem; }
.btn.block { width: 100%; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.btn-row.center { justify-content: center; }
.link-btn {
  background: none; border: 0; padding: 0; font: inherit; font-size: .875rem; font-weight: 600;
  color: var(--primary); cursor: pointer;
}
.link-btn:hover { text-decoration: underline; }
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%; border: 0; background: transparent;
  font-size: 1.5rem; line-height: 1; color: var(--muted); cursor: pointer;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.chip-btn {
  display: inline-flex; align-items: center; gap: 6px; min-height: 34px; padding: 3px 12px 3px 4px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
  font: inherit; font-size: .875rem; font-weight: 600; color: var(--text); cursor: pointer;
}
.suggest .chip-btn { padding: 3px 12px; }
.chip-btn:hover { border-color: var(--primary); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.brand-mark { font-size: 1.3rem; }
.nav { display: flex; gap: 4px; flex: 1; }
.nav a {
  position: relative; padding: 8px 12px; border-radius: 999px;
  color: var(--muted); font-weight: 600; font-size: .925rem; text-decoration: none; white-space: nowrap;
}
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--primary); background: var(--primary-soft); }
.dot {
  display: inline-grid; place-items: center; min-width: 18px; height: 18px; margin-left: 6px; padding: 0 5px;
  border-radius: 999px; background: var(--warn); color: #fff; font-size: .7rem; font-weight: 700; vertical-align: 1px;
}
.user-area { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.bell {
  position: relative; display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%;
  color: var(--text);
}
.bell:hover, .bell[aria-current="page"] { background: var(--surface-2); color: var(--text); }
.badge {
  position: absolute; top: 2px; right: 0; min-width: 19px; height: 19px; padding: 0 5px;
  display: grid; place-items: center; border-radius: 999px; border: 2px solid var(--surface);
  background: var(--danger); color: #fff; font-size: .68rem; font-weight: 800;
}
.me { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: .925rem; }
.avatar {
  display: inline-grid; place-items: center; flex: none; width: 34px; height: 34px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary); font-weight: 700; font-size: .8rem; object-fit: cover;
}
.avatar.sm { width: 26px; height: 26px; font-size: .68rem; }
.avatar.xs { width: 22px; height: 22px; font-size: .6rem; vertical-align: middle; }

@media (max-width: 760px) {
  .nav { order: 3; flex-basis: 100%; overflow-x: auto; scrollbar-width: none; margin: 0 -16px; padding: 0 16px; }
  .nav::-webkit-scrollbar { display: none; }
  .me-name { display: none; }
}

/* ---------- cards & layout ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px;
}
.card.compact { padding: 16px; }
.stack { display: grid; gap: 14px; }
.section { margin-top: 36px; }
.section h2 { display: flex; align-items: center; gap: 8px; }
.count {
  display: inline-grid; place-items: center; min-width: 24px; height: 24px; padding: 0 7px;
  border-radius: 999px; background: var(--surface-2); color: var(--muted); font-size: .8rem; font-weight: 700;
}
.page-head { margin-bottom: 24px; }
.page-head.row { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.page-head .lead { margin-bottom: 0; }
.lead { color: var(--muted); font-size: 1.05rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; font-weight: 700; color: var(--primary); margin-bottom: .5em; }
.back, .crumbs { display: inline-block; margin-bottom: 12px; font-size: .9rem; font-weight: 600; text-decoration: none; }
.crumbs { color: var(--muted); }
.crumbs a { text-decoration: none; }
.meta { color: var(--muted); font-size: .85rem; margin: 0; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

/* ---------- login hero ---------- */
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: start; padding-top: 16px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); }
.how { padding-left: 1.2em; margin: 24px 0 0; display: grid; gap: 10px; }
.how li::marker { color: var(--primary); font-weight: 800; }
.login-card h2 { margin-bottom: 16px; }
.gsi { display: flex; justify-content: center; min-height: 44px; }
.divider { display: flex; align-items: center; gap: 12px; margin: 18px 0; color: var(--muted); font-size: .85rem; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.demo-accounts { margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--border); }
.demo-accounts p { margin-bottom: 8px; }
.note { margin-top: 16px; padding: 10px 12px; border-radius: var(--radius-sm); background: var(--surface-2); color: var(--muted); font-size: .85rem; }
@media (max-width: 820px) { .hero { grid-template-columns: 1fr; gap: 24px; } }

/* ---------- home ---------- */
.choice-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.choice {
  display: flex; flex-direction: column; gap: 8px; padding: 26px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  color: var(--text); text-decoration: none; transition: transform .15s, border-color .15s, box-shadow .15s;
}
.choice:hover { color: var(--text); border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.choice-icon { font-size: 2.2rem; }
.choice-title { font-size: 1.5rem; font-weight: 800; letter-spacing: -.01em; }
.choice-text { color: var(--muted); flex: 1; }
.choice-cta { color: var(--primary); font-weight: 700; margin-top: 6px; }
.choice-sell .choice-cta { color: var(--accent); }
.choice-sell:hover { border-color: var(--accent); }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 36px; }
.stat {
  display: flex; flex-direction: column; padding: 16px; border-radius: var(--radius);
  background: var(--surface-2); color: var(--muted); text-decoration: none; font-size: .875rem;
}
.stat strong { font-size: 1.6rem; color: var(--text); }
.stat:hover { color: var(--text); }
@media (max-width: 520px) { .stats { grid-template-columns: 1fr; } }

/* ---------- forms ---------- */
.form { max-width: 640px; display: grid; gap: 22px; padding: 26px; }
.field { display: grid; gap: 7px; border: 0; padding: 0; margin: 0; min-width: 0; }
.label { font-weight: 700; font-size: .95rem; padding: 0; }
.step {
  display: inline-grid; place-items: center; width: 24px; height: 24px; margin-right: 6px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary); font-size: .8rem; font-weight: 800;
}
input, select, textarea {
  width: 100%; font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; min-height: 44px;
}
textarea { resize: vertical; min-height: 88px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
input:disabled { background: var(--surface-2); color: var(--muted); }
input[type="radio"], input[type="checkbox"] { width: auto; min-height: 0; accent-color: var(--primary); }
.hint { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: .825rem; }
.type-pick { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.type-option { position: relative; cursor: pointer; }
.type-option input { position: absolute; opacity: 0; }
.type-option > span {
  display: flex; align-items: center; gap: 8px; padding: 14px 16px; border-radius: var(--radius-sm);
  border: 2px solid var(--border); font-weight: 600;
}
.type-icon { font-size: 1.3rem; }
.type-option input:checked + span { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.type-option input:focus-visible + span { outline: 3px solid var(--primary); outline-offset: 2px; }
.price-row { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.price-input { position: relative; max-width: 200px; }
.price-input > span { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--muted); font-weight: 700; pointer-events: none; }
.price-input input { padding-left: 32px; font-weight: 700; }
.check { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; cursor: pointer; }
.form-actions { display: flex; justify-content: flex-end; }
.form-error {
  margin: 0; padding: 10px 12px; border-radius: var(--radius-sm);
  background: var(--danger-soft); color: var(--danger); font-weight: 600; font-size: .9rem;
}
.search { margin-top: 18px; max-width: 460px; border-radius: 999px; padding-left: 18px; }
.suggest { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }

/* ---------- courses ---------- */
.dept { margin-bottom: 26px; }
.dept-name { font-size: .85rem; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin-bottom: 10px; }
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.course-tile {
  display: flex; flex-direction: column; gap: 3px; padding: 14px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); text-decoration: none; transition: border-color .15s, transform .15s;
}
.course-tile:hover { color: var(--text); border-color: var(--primary); transform: translateY(-1px); }
.course-code { font-size: .8rem; font-weight: 800; color: var(--primary); }
.course-name { font-weight: 650; }
.course-count { font-size: .825rem; color: var(--accent); font-weight: 600; margin-top: 4px; }
.course-count.none { color: var(--muted); font-weight: 400; }

/* ---------- listings ---------- */
.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.segmented { display: inline-flex; padding: 4px; border-radius: 999px; background: var(--surface-2); }
.segmented a { padding: 7px 14px; border-radius: 999px; color: var(--muted); text-decoration: none; font-weight: 600; font-size: .9rem; white-space: nowrap; }
.segmented a.on { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.sort { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: .9rem; font-weight: 600; }
.sort select { width: auto; min-height: 38px; padding: 6px 10px; }
.listing-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.listing { display: flex; flex-direction: column; gap: 10px; }
.listing .desc { flex: 1; }
.listing-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.desc { margin: 0; overflow-wrap: anywhere; }
.card-title { font-size: 1.05rem; margin: 10px 0 6px; }
.tag {
  display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px;
  font-size: .78rem; font-weight: 700; background: var(--primary-soft); color: var(--primary);
}
.tag-mock { background: var(--warn-soft); color: var(--warn); }
.price { font-size: 1.35rem; font-weight: 800; letter-spacing: -.01em; }
.price.free { color: var(--accent); }
.listing-actions { border-top: 1px solid var(--border); padding-top: 12px; display: grid; gap: 10px; }
.status-line { margin: 0; font-size: .9rem; }
.status-line.turn { color: var(--warn); font-weight: 600; }
@media (max-width: 400px) { .listing-grid { grid-template-columns: 1fr; } }

/* ---------- offers ---------- */
.pill { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .75rem; font-weight: 700; }
.pill-turn { background: var(--warn-soft); color: var(--warn); }
.pill-wait { background: var(--surface-2); color: var(--muted); }
.pill-ok { background: var(--accent-soft); color: var(--accent); }
.pill-off { background: var(--surface-2); color: var(--muted); }
.seller-card.sold { opacity: .95; }
.offers { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); display: grid; gap: 10px; }
.offers h3 { display: flex; align-items: center; gap: 8px; margin: 0; }
.offer { padding: 12px 14px; border-radius: var(--radius-sm); background: var(--surface-2); display: grid; gap: 8px; margin-top: 10px; }
.offers .offer { margin-top: 0; }
.offer.is-turn { background: var(--warn-soft); box-shadow: inset 3px 0 0 var(--warn); }
.offer-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.offer-who { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }
.offer-amount { margin-left: auto; font-weight: 800; font-size: 1.1rem; }
.thread { list-style: none; margin: 0; padding: 0; display: grid; gap: 3px; font-size: .875rem; color: var(--muted); }
.thread li { padding-left: 14px; position: relative; }
.thread li::before { content: ""; position: absolute; left: 2px; top: .6em; width: 6px; height: 6px; border-radius: 50%; background: var(--border); }
.thread li.mine::before { background: var(--primary); }
.thread li.theirs::before { background: var(--warn); }
.thread strong { color: var(--text); }
.thread time { font-size: .8rem; opacity: .8; }
.thread q { display: block; margin: 2px 0 2px; font-style: italic; color: var(--text); }
.past { margin-top: 14px; }
.past summary { cursor: pointer; color: var(--muted); font-weight: 600; font-size: .9rem; }
.contact {
  padding: 14px 16px; border-radius: var(--radius-sm);
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
}
.contact p { margin-bottom: 8px; }
.contact .note { margin: 10px 0 0; background: transparent; padding: 0; }
.contact .btn.primary { background: var(--accent); }
.contact-title { font-weight: 800; color: var(--accent); }

/* ---------- notifications ---------- */
.notif-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.notif {
  display: flex; gap: 14px; padding: 16px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
}
.notif.unread { border-color: color-mix(in srgb, var(--primary) 45%, transparent); background: color-mix(in srgb, var(--primary-soft) 55%, var(--surface)); }
.notif-icon { font-size: 1.4rem; }
.notif-body { flex: 1; min-width: 0; }
.notif-body p { margin-bottom: 6px; overflow-wrap: anywhere; }
.notif-title { font-weight: 700; }
.notif.unread .notif-title::after { content: ""; display: inline-block; width: 8px; height: 8px; margin-left: 8px; border-radius: 50%; background: var(--primary); vertical-align: 2px; }
.notif-foot { display: flex; gap: 16px; align-items: center; color: var(--muted); font-size: .825rem; }
.contact-inline {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 6px 0 10px; padding: 8px 12px;
  border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent); font-weight: 600;
}
.contact-inline a { color: inherit; overflow-wrap: anywhere; }

/* ---------- empty states ---------- */
.empty { text-align: center; padding: 48px 16px; color: var(--muted); }
.empty-icon { font-size: 2.6rem; margin-bottom: 8px; }
.empty h2 { color: var(--text); }
.empty-search { text-align: center; padding: 24px; }

/* ---------- modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 16px;
  background: rgba(10, 12, 20, .55); animation: fade .15s ease-out;
}
.modal {
  width: 100%; max-width: 480px; max-height: calc(100vh - 32px); overflow: auto;
  background: var(--surface); border-radius: 18px; box-shadow: var(--shadow-lg); animation: pop .18s ease-out;
}
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 18px 20px 0; }
.modal-head h2 { margin: 0; }
.modal-body { padding: 14px 20px; display: grid; gap: 14px; }
.modal-body p { margin: 0; }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; padding: 0 20px 20px; flex-wrap: wrap; }
.summary { padding: 14px; border-radius: var(--radius-sm); background: var(--surface-2); display: grid; gap: 4px; }
.summary-top { display: flex; justify-content: space-between; align-items: center; }
.summary-course { font-weight: 700; margin: 4px 0 0; }
.summary-desc { color: var(--muted); font-size: .9rem; overflow-wrap: anywhere; }
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: translateY(8px) scale(.98); } }

/* ---------- toasts ---------- */
.toasts { position: fixed; bottom: 16px; right: 16px; left: 16px; z-index: 60; display: grid; justify-items: end; gap: 8px; pointer-events: none; }
.toast {
  pointer-events: auto; display: flex; align-items: center; gap: 12px; max-width: 420px;
  padding: 12px 10px 12px 16px; border-radius: 12px; box-shadow: var(--shadow-lg);
  background: var(--text); color: var(--bg); font-weight: 600; font-size: .925rem; animation: pop .2s ease-out;
}
.toast.success { background: var(--accent); color: #fff; }
.toast.error { background: var(--danger); color: #fff; }
.toast.notif { background: var(--primary); color: var(--on-primary); }
.toast a { color: inherit; font-weight: 800; }
.toast.out { opacity: 0; transform: translateY(6px); transition: opacity .2s, transform .2s; }
.toast-msg { flex: 1; }
.toast-x { background: none; border: 0; color: inherit; font-size: 1.3rem; line-height: 1; cursor: pointer; opacity: .8; padding: 0 4px; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 20px 0; color: var(--muted); font-size: .85rem; }
.footer .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- university logo ---------- */
.uni-logo { height: 46px; width: auto; display: block; }
.brand-divider { width: 1px; height: 28px; background: var(--border); margin: 0 4px; }
@media (prefers-color-scheme: dark) {
  /* the emblem is dark red/teal, so give it a light backing in dark mode */
  .uni-logo { background: #f4f1ea; border-radius: 8px; padding: 3px 5px; }
}
main.container { position: relative; overflow-x: clip; }
main > *:not(.watermark) { position: relative; z-index: 1; }
.watermark {
  position: absolute; top: 8px; right: 0; z-index: 0;
  height: min(460px, 75vw); width: auto; opacity: .07; pointer-events: none; user-select: none;
}
/* login page: sit behind the headline, not hidden behind the sign-in card */
.watermark.on-login { right: auto; left: 30%; top: 40px; height: min(520px, 75vw); }
@media (max-width: 820px) { .watermark.on-login { left: auto; right: 0; } }
@media (prefers-color-scheme: dark) { .watermark { opacity: .1; filter: grayscale(.3) brightness(1.6); } }
.center-text { text-align: center; margin: 14px 0 0; }

/* ---------- photos ---------- */
.photo-btn { display: block; padding: 0; border: 0; background: var(--surface-2); cursor: zoom-in; overflow: hidden; }
.photo-btn img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .25s; }
.photo-btn:hover img { transform: scale(1.03); }
.listing-photo { margin: -20px -20px 4px; aspect-ratio: 4 / 3; border-radius: var(--radius) var(--radius) 0 0; }
.listing-photo.placeholder { display: grid; place-items: center; font-size: 3rem; background: var(--surface-2); opacity: .8; }
.thumb { width: 104px; height: 104px; flex: none; border-radius: var(--radius-sm); }
.seller-main { display: flex; gap: 16px; align-items: flex-start; justify-content: space-between; }
.seller-main > div { min-width: 0; }
.summary.has-photo { grid-template-columns: 88px 1fr; gap: 12px; align-items: start; }
.summary-photo { width: 88px; height: 88px; object-fit: cover; border-radius: 8px; }
.location { color: var(--text); }
.photo-pick { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.photo-preview { width: 120px; height: 120px; object-fit: cover; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.file-btn { position: relative; overflow: hidden; }
.file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; min-height: 0; }
.file-btn:focus-within { outline: 3px solid var(--primary); outline-offset: 2px; }
.lightbox { background: rgba(5, 6, 12, .88); }
.lightbox figure { margin: 0; max-width: min(92vw, 1000px); text-align: center; }
.lightbox img { max-height: 80vh; border-radius: 10px; box-shadow: var(--shadow-lg); }
.lightbox figcaption { color: #e8eaf2; margin-top: 10px; font-weight: 600; }
.lightbox-x { position: fixed; top: 14px; right: 14px; color: #fff; background: rgba(255, 255, 255, .12); }
.lightbox-x:hover { background: rgba(255, 255, 255, .25); color: #fff; }
@media (max-width: 520px) { .thumb { width: 76px; height: 76px; } }

/* ---------- help chatbot ---------- */
.chat { max-width: 760px; padding: 0; overflow: hidden; }
.chat-log { max-height: min(62vh, 640px); overflow-y: auto; padding: 20px; display: grid; gap: 14px; background: var(--surface-2); }
.msg { display: flex; gap: 10px; align-items: flex-end; animation: pop .2s ease-out; }
.msg.user { justify-content: flex-end; }
.msg .bubble { margin: 0; padding: 12px 16px; border-radius: 16px; max-width: 85%; }
.msg.bot .bubble { background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.user .bubble { background: var(--primary); color: var(--on-primary); border-bottom-right-radius: 4px; font-weight: 600; }
.msg.bot .bubble > p { margin: 0 0 8px; }
.msg.bot .bubble > :last-child { margin-bottom: 0; }
.bot-avatar { display: grid; place-items: center; flex: none; width: 34px; height: 34px; border-radius: 50%; background: var(--primary-soft); font-size: 1.1rem; }
.help-steps { margin: 4px 0 12px; padding-left: 1.3em; display: grid; gap: 6px; }
.help-steps li::marker { color: var(--primary); font-weight: 800; }
.chat-options { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chat-options .chip-btn { padding: 6px 14px; text-align: left; }
.chat-input { display: flex; gap: 8px; padding: 14px 16px 6px; border-top: 1px solid var(--border); }
.chat-input input { border-radius: 999px; padding-left: 16px; }
.chat-foot { padding: 4px 18px 14px; }

/* "Here it is!" pulse when the help bot sends you somewhere */
.guide-pulse { animation: guide-pulse 1.4s ease-out 3; border-radius: 12px; }
@keyframes guide-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--warn) 70%, transparent); }
  70% { box-shadow: 0 0 0 14px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
@media (prefers-reduced-motion: reduce) { .guide-pulse { outline: 3px solid var(--warn); } }