:root {
  --bg: #f1f1f0;
  --panel: #ffffff;
  --ink: #262626;            /* SFU anthrazite */
  --muted: #6f6f72;
  --line: #dddddd;
  --accent: #871448;         /* SFU bordeaux (--main-color) */
  --accent-2: #6d1039;       /* darker bordeaux for hover */
  --accent-tint: #f6e9f0;    /* light bordeaux wash */
  --danger: #b42318;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(38,38,38,.08), 0 1px 2px rgba(38,38,38,.04);
  --font-sans: "IBM Plex Sans", Calibri, Helvetica, Arial, sans-serif;
  --font-serif: "IBM Plex Serif", Georgia, Times, serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--font-sans);
  color: var(--ink); background: var(--bg); line-height: 1.5;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); }
h1, h2 { font-family: var(--font-serif); letter-spacing: -.01em; }

/* ---------- login ---------- */
.login-page { display: grid; place-items: center; min-height: 100vh; padding: 20px;
  background: linear-gradient(155deg, #871448 0%, #5e0e33 55%, #360720 100%); }
.login-card {
  background: var(--panel); padding: 34px 32px; border-radius: 18px; box-shadow: 0 18px 50px rgba(0,0,0,.28);
  width: min(370px, 94vw); display: flex; flex-direction: column; gap: 14px; text-align: center;
}
.login-logo { width: 92px; height: auto; margin: 0 auto 2px; display: block; }
.login-card h1 { margin: 0; font-size: 23px; line-height: 1.15; color: var(--accent); }
.login-card .sub { margin: 0 0 6px; color: var(--muted); }
.login-card label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); text-align: left; }
.login-card input { padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 15px; }
.login-card input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.login-card button { margin-top: 6px; padding: 12px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; font-weight: 700; cursor: pointer; }
.login-card button:hover { background: var(--accent-2); }

/* ---------- topbar ---------- */
.topbar { display: flex; align-items: center; gap: 14px; padding: 9px 18px; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--ink); }
.brand-logo { height: 36px; width: auto; display: block; }
.brand-text { font-family: var(--font-serif); font-weight: 600; font-size: 18px; color: var(--ink); }
.brand-text span { color: var(--muted); font-weight: 500; }
.topnav { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.badge { background: var(--accent-tint); color: var(--accent); padding: 3px 11px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; padding: 6px; font-weight: 600; }
.link:hover { text-decoration: underline; }
.link.danger { color: var(--danger); }
.icon-btn { display: none; background: none; border: 0; font-size: 20px; cursor: pointer; color: var(--ink); }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: 290px 1fr; min-height: calc(100vh - 55px); }
.sidebar { border-right: 1px solid var(--line); background: var(--panel); padding: 14px; overflow-y: auto; }
.sidebar h2 { font-family: var(--font-sans); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 6px 6px 12px; }
.session-list { display: flex; flex-direction: column; gap: 4px; }
.session-item { display: flex; gap: 10px; align-items: center; text-align: left; background: none; border: 0; border-radius: 10px; padding: 8px; cursor: pointer; }
.session-item:hover { background: #f3f0f1; }
.session-item.active { background: var(--accent-tint); }
.session-item .thumb { width: 44px; height: 44px; border-radius: 8px; background: #ececeb; overflow: hidden; flex: 0 0 auto; display: grid; place-items: center; }
.session-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
.session-item .meta { display: flex; flex-direction: column; min-width: 0; }
.session-item .title { font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-item .sub { font-size: 12px; color: var(--muted); }

.main { padding: 24px; overflow-y: auto; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; max-width: 980px; margin: 0 auto; }
.panel h1 { margin: 0 0 16px; font-size: 24px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.error { color: var(--danger); }

/* ---------- new form ---------- */
.dropzone { border: 2px dashed var(--line); border-radius: var(--radius); padding: 28px; text-align: center; background: #fafafa; cursor: pointer; }
.dropzone.drag { border-color: var(--accent); background: var(--accent-tint); }
.dropzone p { margin: 4px 0; }
.previews { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
.preview { position: relative; width: 110px; }
.preview img { width: 110px; height: 110px; object-fit: cover; border-radius: 10px; border: 1px solid var(--line); }
.preview span { display: block; font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.preview .rm { position: absolute; top: 4px; right: 4px; width: 22px; height: 22px; border: 0; border-radius: 50%; background: rgba(38,38,38,.65); color: #fff; cursor: pointer; }

.row { margin: 16px 0; }
.row.gap { display: flex; gap: 16px; flex-wrap: wrap; }
.seg { border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.seg legend { font-size: 12px; color: var(--muted); padding: 0 6px; }
.seg label { display: flex; align-items: center; gap: 8px; padding: 4px 0; cursor: pointer; }
.check { display: flex; align-items: center; gap: 8px; margin: 12px 0; cursor: pointer; }
.block { display: flex; flex-direction: column; gap: 6px; }
label > select { display: block; margin-top: 4px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; resize: vertical; font-size: 14px; font-family: var(--font-sans); }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.adv { margin: 14px 0; border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 14px; }
.adv summary { cursor: pointer; padding: 8px 0; font-weight: 600; }

.actions { display: flex; align-items: center; gap: 14px; margin-top: 18px; }
.primary { background: var(--accent); color: #fff; border: 0; padding: 11px 24px; border-radius: 10px; font-weight: 700; cursor: pointer; transition: background .15s, transform .05s; }
.primary:hover { background: var(--accent-2); }
.primary:active { transform: scale(.98); }
.primary:disabled { background: #b9aab1; cursor: not-allowed; }
.btn { display: inline-block; padding: 7px 13px; border-radius: 8px; border: 1px solid var(--line); background: #fff; text-decoration: none; color: var(--ink); cursor: pointer; font-weight: 600; }
.btn:hover { background: var(--accent-tint); border-color: var(--accent); color: var(--accent); }

/* ---------- session chain ---------- */
.session-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.session-head h1 { margin: 0; }
.session-head .spacer { flex: 1; }
.tag { background: var(--accent-tint); color: var(--accent); padding: 3px 11px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.chain { display: flex; flex-direction: column; gap: 16px; }
.turn { display: flex; }
.io { display: flex; align-items: center; gap: 16px; width: 100%; flex-wrap: wrap; background: #fafafa; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.io-side { display: flex; flex-direction: column; gap: 8px; }
.io-side .lbl { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 600; }
.io-side.result { margin-left: auto; align-items: center; min-width: 220px; }
.thumbs { display: flex; gap: 8px; flex-wrap: wrap; }
.thumbs img { width: 86px; height: 86px; object-fit: cover; border-radius: 8px; border: 1px solid var(--line); }
.instr { margin: 0; max-width: 360px; font-style: italic; }
.arrow { font-size: 24px; color: var(--accent); }
.io-side.result img { max-width: 320px; width: 100%; border-radius: 10px; border: 1px solid var(--line); }
.res-actions { display: flex; align-items: center; gap: 12px; }
.error-box { padding: 20px; }
.spinner { width: 30px; height: 30px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- follow-up ---------- */
.followup { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 16px; }
.fu-actions { display: flex; align-items: center; justify-content: flex-end; margin-top: 8px; gap: 12px; }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .icon-btn { display: block; }
  .topnav .link { font-size: 14px; }
  .brand-text { font-size: 16px; }
  .sidebar { position: fixed; z-index: 30; top: 55px; bottom: 0; left: 0; width: 82vw; max-width: 320px; transform: translateX(-105%); transition: transform .2s; box-shadow: var(--shadow); }
  .sidebar.open { transform: translateX(0); }
  .io-side.result { margin-left: 0; }
  .arrow { display: none; }
}