:root {
  --navy: #172033;
  --blue: #007aff;
  --blue-soft: #edf5ff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --surface: #f5f5f7;
  --card: rgba(255, 255, 255, .86);
  --success: #18794e;
  --success-soft: #e8f5ee;
  --warning: #9a6700;
  --warning-soft: #fff4d6;
  --danger: #b42318;
  --danger-soft: #fff0ee;
  --radius: 18px;
  --control-radius: 12px;
  --shadow: 0 18px 48px rgba(0, 0, 0, .08);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, .055);
}

:root[data-theme="dark"] {
  --navy: #d9eaff;
  --blue: #6aa7e8;
  --blue-soft: #17324d;
  --ink: #edf4fb;
  --muted: #aebdcb;
  --line: #31485f;
  --surface: #0f1720;
  --card: rgba(16, 26, 36, .86);
  --success: #81d9ad;
  --success-soft: #123222;
  --warning: #f1cb72;
  --warning-soft: #392a0c;
  --danger: #ff9b91;
  --danger-soft: #3d1714;
  --shadow: 0 10px 30px rgba(0, 0, 0, .25);
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: radial-gradient(circle at top left, rgba(0, 122, 255, .12), transparent 28rem), var(--surface); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 15px; line-height: 1.45; }
:root[data-font="sans"] body { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
:root[data-font="system"] body { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
:root[data-font="serif"] body { font-family: Georgia, "Times New Roman", serif; }
:root[data-font="mono"] body { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }
a { color: var(--blue); text-decoration: none; }
button, input, select, textarea { font: inherit; }
input, select, textarea { width: 100%; border: 1px solid var(--line); border-radius: var(--control-radius); background: rgba(255,255,255,.92); color: var(--ink); padding: 11px 13px; box-shadow: inset 0 1px 0 rgba(255,255,255,.65); }
:root[data-theme="dark"] input, :root[data-theme="dark"] select, :root[data-theme="dark"] textarea { border-color: var(--line); background: #111d29; color: var(--ink); }
textarea { min-height: 120px; resize: vertical; }
input:focus, select:focus, textarea:focus, button:focus-visible, a:focus-visible { outline: 3px solid rgba(36, 105, 167, .2); outline-offset: 1px; border-color: var(--blue); }
label { display: grid; gap: 6px; color: var(--ink); font-size: 13px; font-weight: 650; }
h1, h2, h3 { color: var(--navy); line-height: 1.2; }
h1 { margin: 0; font-size: 25px; }
h2 { font-size: 18px; }

.topbar { position: sticky; top: 0; z-index: 20; min-height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px 28px; border-bottom: 1px solid rgba(229,229,234,.72); background: rgba(255,255,255,.78); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); }
:root[data-theme="dark"] .topbar { background: rgba(12, 20, 29, .82); }
.brand { display: grid; color: var(--navy); font-size: 18px; font-weight: 780; letter-spacing: -.02em; line-height: 1.15; }
.brand small { margin-top: 3px; color: var(--muted); font-size: 10px; font-weight: 600; letter-spacing: 0; }
.account { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; color: var(--muted); font-size: 13px; }
.topbar-button { border: 1px solid var(--line); border-radius: 999px; padding: 7px 12px; background: rgba(255,255,255,.58); color: var(--ink); cursor: pointer; font-size: 12px; font-weight: 700; box-shadow: var(--shadow-soft); }
.topbar-button:hover { background: var(--blue-soft); }
.app-shell { min-height: calc(100vh - 64px); display: grid; grid-template-columns: 224px minmax(0, 1fr); gap: 18px; padding: 18px; }
.sidebar { align-self: start; position: sticky; top: 84px; padding: 12px; border: 1px solid rgba(229,229,234,.82); border-radius: 24px; background: var(--card); box-shadow: var(--shadow-soft); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
:root[data-theme="dark"] .sidebar { background: rgba(16, 26, 36, .86); }
.sidebar a { display: block; margin-bottom: 4px; padding: 11px 13px; border-radius: 14px; color: var(--muted); font-size: 14px; font-weight: 650; }
.sidebar a:hover, .sidebar a.active { color: var(--navy); background: var(--blue-soft); }
.content { width: 100%; max-width: 1500px; padding: 20px 16px 70px; overflow: hidden; background: transparent; }
:root[data-theme="dark"] .content { background: transparent; }
.content-auth { grid-column: 1 / -1; max-width: none; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 25px; }
.page-actions, .form-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.table-actions { display: flex; gap: 7px; align-items: center; flex-wrap: wrap; }
.inline-form { display: inline-flex; margin: 0; }
.button { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--line); border-radius: 999px; padding: 9px 16px; color: #243040; background: rgba(255,255,255,.86); cursor: pointer; font-size: 13px; font-weight: 750; box-shadow: var(--shadow-soft); transition: transform .16s ease, background .16s ease, box-shadow .16s ease; }
:root[data-theme="dark"] .button { border-color: var(--line); background: #111d29; color: var(--ink); }
.button:hover { background: #fff; transform: translateY(-1px); }
.button.primary { border-color: var(--blue); background: var(--blue); color: #fff; }
.button.primary:hover { background: #1b578c; }
.button.danger { border-color: #e5aaa4; color: var(--danger); }
.button.small { min-height: 32px; padding: 5px 10px; }
.alert { margin: 0 0 18px; border: 1px solid; border-radius: 6px; padding: 11px 14px; }
.alert-success { color: var(--success); border-color: #b7dec9; background: var(--success-soft); }
.alert-error { color: var(--danger); border-color: #f2bbb5; background: var(--danger-soft); }
.alert-warning { color: var(--warning); border-color: #efd48d; background: var(--warning-soft); }
.alert-info { color: var(--navy); border-color: #bfd4e7; background: var(--blue-soft); }

.stats { display: grid; grid-template-columns: repeat(4, minmax(140px, 1fr)); gap: 14px; margin-bottom: 24px; }
.compact-stats { grid-template-columns: minmax(180px, 320px); }
.stat { border-top: 3px solid var(--blue); padding: 16px 2px 12px; }
.stat strong { display: block; color: var(--navy); font-size: 28px; }
.stat span { color: var(--muted); font-size: 13px; }
.table-wrap { overflow-x: auto; border: 1px solid rgba(229,229,234,.86); border-radius: var(--radius); background: var(--card); box-shadow: var(--shadow-soft); }
table { width: 100%; border-collapse: collapse; }
.table-wrap { max-height: 70vh; overflow: auto; }
th { position: sticky; top: 0; z-index: 1; background: rgba(245,245,247,.95); color: #646472; font-size: 12px; letter-spacing: .02em; text-align: left; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
:root[data-theme="dark"] th { background: #162434; color: var(--muted); }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th[role="button"] { cursor: pointer; user-select: none; }
th[role="button"]:hover { color: var(--navy); background: var(--blue-soft); }
th[aria-sort="ascending"]::after { content: " ▲"; font-size: 10px; }
th[aria-sort="descending"]::after { content: " ▼"; font-size: 10px; }
:root[data-theme="dark"] td { background: #0f1720; }
tr:last-child td { border-bottom: 0; }
.status { display: inline-flex; border-radius: 999px; padding: 4px 9px; font-size: 12px; font-weight: 750; }
.status-pending { color: #5c6874; background: #edf1f4; }
.status-draft { color: var(--warning); background: var(--warning-soft); }
.status-completed { color: var(--success); background: var(--success-soft); }
.muted { color: var(--muted); }
.empty { padding: 38px; color: var(--muted); text-align: center; }

.panel { margin-bottom: 22px; border: 1px solid rgba(229,229,234,.86); border-radius: var(--radius); background: var(--card); padding: 22px; box-shadow: var(--shadow-soft); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
:root[data-theme="dark"] .panel, :root[data-theme="dark"] .presentation-item { background: #101a24; }
.hero-panel { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 26px; }
.hero-panel h2 { margin-top: 0; font-size: 24px; letter-spacing: -.02em; }
.hero-panel p { max-width: 760px; margin-bottom: 0; }
.panel-heading { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.panel-heading h2, .panel-heading p { margin: 0; }
.panel-heading p { margin-top: 5px; }
.danger-zone { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 16px; }
.process-steps { display: grid; grid-template-columns: repeat(5, minmax(150px, 1fr)); gap: 12px; }
.process-step { position: relative; display: grid; gap: 8px; border: 1px solid var(--line); border-radius: 20px; padding: 16px; background: rgba(255,255,255,.66); box-shadow: var(--shadow-soft); }
:root[data-theme="dark"] .process-step { background: #101a24; }
.process-step strong { display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; border-radius: 999px; background: linear-gradient(180deg, #48a3ff, var(--blue)); color: #fff; font-size: 17px; box-shadow: 0 8px 18px rgba(0,122,255,.24); }
.process-step span { color: var(--navy); font-size: 14px; font-weight: 800; }
.process-step p { margin: 0; color: var(--muted); font-size: 12px; }
.tutor-observations { border-left: 4px solid var(--blue); background: var(--blue-soft); }
.tutor-observations h2 { margin-top: 0; }
.tutor-observations p { margin-bottom: 0; white-space: normal; }
.document-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
.document-card { display: grid; gap: 8px; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; background: #fbfcfd; }
:root[data-theme="dark"] .document-card { background: #101a24; }
.document-card strong { color: var(--navy); }
.document-card span { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 18px; }
.role-editor { display: grid; gap: 12px; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.role-editor h3 { margin: 0; }
.role-row { display: grid; grid-template-columns: minmax(240px, 1fr) minmax(320px, 1.4fr); gap: 14px; align-items: end; }
.role-toggle { display: flex; gap: 8px; flex-wrap: wrap; }
.role-toggle label { display: block; }
.role-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.role-toggle span { display: inline-flex; min-height: 40px; align-items: center; border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; color: var(--muted); cursor: pointer; font-size: 13px; font-weight: 800; }
.role-toggle input:checked + span { border-color: var(--blue); background: var(--blue); color: #fff; }
.tutor-grade-card { float: right; display: grid; min-width: 190px; justify-items: center; margin: 0 0 16px 16px; border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; background: var(--blue-soft); }
.tutor-grade-card span { color: var(--muted); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.tutor-grade-card strong { color: var(--navy); font-size: 46px; line-height: 1; }
.criterion-number { display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; margin-right: 10px; border-radius: 999px; background: var(--blue); color: #fff; font-size: 18px; font-weight: 900; vertical-align: middle; }
.span-2 { grid-column: span 2; }
.stack-form { display: grid; gap: 16px; }
.login-panel, .install-card { width: min(560px, calc(100% - 32px)); margin: 8vh auto; border: 1px solid var(--line); border-radius: 10px; padding: 28px; box-shadow: var(--shadow); }
.install-card { width: min(760px, calc(100% - 32px)); }
.install-page { background: var(--surface); }
.install-card hr { width: 100%; border: 0; border-top: 1px solid var(--line); }

.evaluation-layout { display: grid; grid-template-columns: 340px minmax(0, 1fr); gap: 24px; align-items: start; }
.evaluation-layout form { padding-bottom: 78px; }
.evaluation-layout form > .panel:last-of-type { padding-bottom: 64px; }
.student-rail { position: sticky; top: 88px; border-right: 1px solid var(--line); padding-right: 18px; }
.student-rail h2 { margin-top: 0; }
.student-link { display: block; margin-bottom: 5px; border-radius: 6px; padding: 10px; color: var(--muted); }
.student-link.active { color: var(--navy); background: var(--blue-soft); font-weight: 700; }
.presentation-form { display: grid; gap: 12px; }
.presentation-list { display: grid; gap: 8px; }
.presentation-item { display: grid; grid-template-columns: 22px 30px minmax(0, 1fr) 74px; gap: 8px; align-items: center; border: 1px solid var(--line); border-radius: 8px; padding: 8px; background: #fff; }
.presentation-item.active { border-color: #aac7df; background: var(--blue-soft); }
.presentation-item.dragging { opacity: .55; }
.drag-handle { color: var(--muted); cursor: grab; text-align: center; font-weight: 800; }
.presentation-number { display: inline-flex; width: 28px; height: 28px; align-items: center; justify-content: center; border-radius: 999px; background: var(--blue); color: #fff; font-size: 13px; font-weight: 800; }
.presentation-student { color: var(--ink); font-size: 13px; font-weight: 740; line-height: 1.2; }
.presentation-student small { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; font-weight: 600; }
.presentation-time { gap: 3px; font-size: 10px; text-transform: uppercase; letter-spacing: .03em; }
.presentation-time input { padding: 6px 5px; font-size: 12px; }
.score-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 22px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 16px 0; }
.score-summary div { border-right: 1px solid var(--line); }
.score-summary div:last-child { border-right: 0; }
.score-summary span { display: block; color: var(--muted); font-size: 12px; }
.score-summary strong { color: var(--navy); font-size: 24px; }
.rubric-section { margin-bottom: 26px; }
.rubric-section h2 { margin: 0 0 4px; }
.rubric-section > p { margin: 0 0 12px; color: var(--muted); font-size: 13px; }
.criterion { display: grid; grid-template-columns: minmax(250px, 1fr) auto; gap: 18px; align-items: center; border-top: 1px solid var(--line); padding: 14px 0; }
.criterion-label { max-width: 780px; }
.score-control { display: grid; grid-template-columns: repeat(10, 34px); gap: 4px; }
.score-control button { width: 34px; height: 34px; border: 1px solid #b9c6d1; border-radius: 5px; background: #fff; color: #35485b; cursor: pointer; font-weight: 700; }
:root[data-theme="dark"] .score-control button { border-color: var(--line); background: #111d29; color: var(--ink); }
.score-control button:hover, .score-control button.selected { border-color: var(--blue); background: var(--blue); color: #fff; }
.sticky-actions { position: sticky; bottom: 0; z-index: 10; display: flex; justify-content: space-between; gap: 12px; margin: 96px -34px -70px; border-top: 1px solid var(--line); padding: 14px 34px; background: rgba(255, 255, 255, .97); }
:root[data-theme="dark"] .sticky-actions { background: rgba(15, 23, 32, .97); }
.checkbox-label { display: flex; grid-column: 1 / -1; flex-direction: row; gap: 10px; align-items: flex-start; font-size: 14px; }
.checkbox-label input { width: auto; margin-top: 3px; }
.pdf-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.pdf-status { margin-top: 18px; margin-bottom: 0; }
.pdf-results { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.app-footer { display: flex; justify-content: space-between; gap: 18px; margin-top: 48px; border-top: 1px solid var(--line); padding-top: 18px; color: var(--muted); font-size: 12px; }
.app-footer a { font-weight: 650; }

@media (max-width: 1000px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: flex; gap: 4px; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 10px 16px; }
  .sidebar a { white-space: nowrap; margin: 0; }
  .content { padding: 24px 18px 70px; }
  .evaluation-layout { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .role-row { grid-template-columns: 1fr; }
  .student-rail { position: static; border-right: 0; border-bottom: 1px solid var(--line); padding: 0 0 16px; }
  .criterion { grid-template-columns: 1fr; }
  .score-control { grid-template-columns: repeat(10, minmax(30px, 1fr)); }
  .score-control button { width: 100%; }
  .sticky-actions { margin-left: -18px; margin-right: -18px; padding-left: 18px; padding-right: 18px; }
}

@media (max-width: 680px) {
  .topbar { padding: 0 16px; }
  .account span { display: none; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .brand small { display: none; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .form-grid { grid-template-columns: 1fr; }
  .process-steps, .document-list { grid-template-columns: 1fr; }
  .span-2 { grid-column: span 1; }
  .score-summary { grid-template-columns: 1fr; }
  .score-summary div { border-right: 0; border-bottom: 1px solid var(--line); padding-bottom: 10px; }
  .score-control { grid-template-columns: repeat(5, 1fr); }
  .app-footer { flex-direction: column; }
}