:root {
  --hu-red: #cd1125;
  --hu-white: #ffffff;
  --hu-green: #00923f;
  --bg: #f4f6fb;
  --panel: #ffffff;
  --ink: #1c2433;
  --ink-soft: #5a6478;
  --line: #e4e8f0;
  --brand: #1b2a5b;
  --brand-2: #2f4ba0;
  --accent: #cd1125;
  --good: #1f9d55;
  --warn: #e0a106;
  --bad: #cd1125;
  --shadow: 0 6px 24px rgba(20, 30, 60, 0.08);
  --radius: 14px;
  --grade5: #1f9d55;
  --grade4: #4cae4f;
  --grade3: #e0a106;
  --grade2: #e8743b;
  --grade1: #cd1125;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}
h1, h2, h3 { margin: 0; font-weight: 700; }

/* Top bar */
.topbar {
  display: flex; align-items: center; gap: 18px;
  padding: 12px 22px;
  background: var(--brand);
  color: #fff;
  position: sticky; top: 0; z-index: 30;
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.flagbar { display: flex; flex-direction: column; width: 8px; height: 34px; border-radius: 3px; overflow: hidden; box-shadow: 0 0 0 1px rgba(255,255,255,.25); }
.flagbar span { flex: 1; }
.flagbar span:nth-child(1) { background: var(--hu-red); }
.flagbar span:nth-child(2) { background: var(--hu-white); }
.flagbar span:nth-child(3) { background: var(--hu-green); }
.brand-text h1 { font-size: 17px; letter-spacing: .2px; }
.brand-text p { margin: 0; font-size: 11px; opacity: .7; font-weight: 500; }

.tabs { display: flex; gap: 6px; margin-left: auto; flex-wrap: wrap; }
.tab {
  background: transparent; color: #cdd6f0; border: none; cursor: pointer;
  padding: 9px 16px; border-radius: 9px; font-size: 14px; font-weight: 600;
  transition: background .15s, color .15s;
}
.tab:hover { background: rgba(255,255,255,.1); color: #fff; }
.tab.active { background: #fff; color: var(--brand); }

.lang-toggle {
  background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.3);
  border-radius: 9px; padding: 8px 12px; cursor: pointer; font-weight: 700; font-size: 13px;
}
.lang-toggle:hover { background: rgba(255,255,255,.2); }

.school-select {
  background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.3);
  border-radius: 9px; padding: 7px 28px 7px 10px; font-size: 13px; font-weight: 600; cursor: pointer;
  max-width: 280px; min-width: 160px; height: 36px; appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' fill='none' stroke='white' stroke-width='1.6'/></svg>");
  background-repeat: no-repeat; background-position: right 10px center;
}
.school-select:hover { background-color: rgba(255,255,255,.2); }
.school-select option { color: #1c2433; background: #fff; }

/* School hero banner */
.school-hero {
  display: flex; align-items: center; gap: 14px;
  background: linear-gradient(90deg, #1b2a5b, #2f4ba0); color: #fff;
  border-radius: var(--radius); padding: 16px 20px; margin-bottom: 18px; box-shadow: var(--shadow);
}
.school-hero .sh-icon { font-size: 30px; line-height: 1; }
.school-hero .sh-label { font-size: 11px; opacity: .75; font-weight: 700; text-transform: uppercase; letter-spacing: .6px; }
.school-hero .sh-name { font-size: 20px; font-weight: 800; }

/* Layout */
main { max-width: 1180px; margin: 0 auto; padding: 22px; }
.view { display: none; animation: fade .25s ease; }
.view.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin-bottom: 20px; box-shadow: var(--shadow);
}
.panel-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.panel-head h2 { font-size: 16px; color: var(--brand); }
.hint { font-size: 12.5px; color: var(--ink-soft); }

/* Summary cards */
.summary-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin-bottom: 20px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); position: relative; overflow: hidden;
}
.card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: var(--brand-2); }
.card.green::before { background: var(--hu-green); }
.card.red::before { background: var(--hu-red); }
.card.amber::before { background: var(--warn); }
.card .label { font-size: 12px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .5px; font-weight: 700; }
.card .value { font-size: 32px; font-weight: 800; margin-top: 6px; color: var(--brand); }
.card.green .value { color: var(--hu-green); }
.card.red .value { color: var(--hu-red); }
.card.amber .value { color: #b9830a; }
.card.blue::before { background: var(--brand-2); }
.card.blue .value { color: var(--brand-2); }
.card .sub { font-size: 12px; color: var(--ink-soft); margin-top: 4px; }
.card .progress { height: 6px; background: #e4e8f0; border-radius: 3px; margin-top: 10px; overflow: hidden; }
.card .progress span { display: block; height: 100%; background: var(--brand-2); border-radius: 3px; transition: width .3s ease; }

.chart-wrap { position: relative; height: 320px; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.stats-grid .panel { margin-bottom: 0; }
@media (max-width: 1024px) {
  .summary-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 860px) {
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .summary-grid { grid-template-columns: 1fr; }
}

/* Recent semesters */
.recent-list { display: flex; flex-direction: column; gap: 10px; }
.recent-row {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr; gap: 10px; align-items: center;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 11px; background: #fafbfe;
}
.recent-row.head { background: transparent; border: none; padding: 4px 14px; font-size: 11px; text-transform: uppercase; letter-spacing: .4px; color: var(--ink-soft); font-weight: 700; }
.recent-row .sem { font-weight: 700; color: var(--brand); }
.recent-row .num { font-variant-numeric: tabular-nums; }
.empty { color: var(--ink-soft); text-align: center; padding: 30px; font-style: italic; }

/* Toolbar */
.toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.spacer { flex: 1; }
.btn {
  background: #eef1f8; color: var(--brand); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 16px; cursor: pointer; font-weight: 600; font-size: 14px; transition: .15s;
}
.btn:hover { background: #e2e7f5; }
.btn.primary { background: var(--brand-2); color: #fff; border-color: var(--brand-2); }
.btn.primary:hover { background: #25408c; }
.btn.danger { background: #fff; color: var(--bad); border-color: #f2c2c8; }
.btn.danger:hover { background: #fdeef0; }
.btn.small { padding: 5px 10px; font-size: 12.5px; border-radius: 8px; }

/* Tree */
.tree { display: flex; flex-direction: column; gap: 14px; }
.year-block { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.year-head {
  display: flex; align-items: center; gap: 12px; padding: 14px 18px; cursor: pointer;
  background: linear-gradient(90deg, #f7f9ff, #fff); border-bottom: 1px solid var(--line);
}
.year-head .ytitle { font-size: 16px; font-weight: 800; color: var(--brand); }
.year-head .ychev { transition: transform .2s; color: var(--ink-soft); }
.year-block.collapsed .year-head .ychev { transform: rotate(-90deg); }
.year-head .ystats { margin-left: auto; display: flex; gap: 16px; font-size: 12.5px; color: var(--ink-soft); }
.year-head .ystats b { color: var(--ink); }
.year-head .yactions { display: flex; gap: 6px; }

.sem-block { border-bottom: 1px solid var(--line); }
.sem-block:last-child { border-bottom: none; }
.sem-head {
  display: flex; align-items: center; gap: 12px; padding: 11px 18px 11px 34px; cursor: pointer;
  background: #fbfcff;
}
.sem-head .stitle { font-weight: 700; color: var(--brand-2); }
.sem-head .schev { color: var(--ink-soft); transition: transform .2s; }
.sem-block.collapsed .sem-head .schev { transform: rotate(-90deg); }
.sem-head .sstats { margin-left: auto; display: flex; gap: 14px; font-size: 12.5px; color: var(--ink-soft); }
.sem-head .sstats b { color: var(--ink); }
.sem-head .sactions { display: flex; gap: 6px; }
.year-block.collapsed .sem-block, .year-block.collapsed .year-foot { display: none; }
.sem-block.collapsed .course-row { display: none; }

.year-foot { padding: 10px 18px 14px 34px; }
.course-add-btn { font-size: 13px; }

.course-row {
  display: grid; grid-template-columns: 1.6fr .8fr .7fr .7fr auto; gap: 12px; align-items: center;
  padding: 9px 18px 9px 46px; border-top: 1px dashed var(--line); font-size: 14px;
}
.course-row:hover { background: #fafbff; }
.course-row .cname { font-weight: 600; }
.course-row .ccode { color: var(--ink-soft); font-size: 12px; }
.course-row .cnum { font-variant-numeric: tabular-nums; text-align: center; }
.grade-pill {
  display: inline-flex; align-items: center; justify-content: center; min-width: 30px; height: 30px;
  border-radius: 8px; color: #fff; font-weight: 800; font-size: 14px; cursor: pointer; border: none;
}
.grade-pill.g5 { background: var(--grade5); }
.grade-pill.g4 { background: var(--grade4); }
.grade-pill.g3 { background: var(--grade3); }
.grade-pill.g2 { background: var(--grade2); }
.grade-pill.g1 { background: var(--grade1); }
.grade-pill.g0 { background: #b9c0d0; }
.course-row .cactions { display: flex; gap: 6px; justify-content: flex-end; }

@media (max-width: 720px) {
  .course-row { grid-template-columns: 1.4fr .6fr .6fr auto; }
  .course-row .ccode { display: none; }
  .recent-row { grid-template-columns: 1.2fr 1fr 1fr; }
  .recent-row .hide-sm { display: none; }
}

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(18, 26, 51, .55); display: flex; align-items: center;
  justify-content: center; z-index: 50; padding: 18px;
}
.modal-backdrop[hidden] { display: none; }
.modal {
  background: #fff; border-radius: 16px; width: 100%; max-width: 520px; box-shadow: 0 20px 60px rgba(0,0,0,.3);
  max-height: 90vh; display: flex; flex-direction: column; overflow: hidden;
}
.modal-head { display: flex; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.modal-head h3 { font-size: 16px; color: var(--brand); }
.modal-close { margin-left: auto; background: none; border: none; font-size: 18px; cursor: pointer; color: var(--ink-soft); }
.modal-body { padding: 18px 20px; overflow-y: auto; }
.modal-foot { padding: 14px 20px; border-top: 1px solid var(--line); display: flex; gap: 10px; justify-content: flex-end; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
.field input, .field select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px; font-size: 14px;
  font-family: inherit; color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid var(--brand-2); border-color: transparent; }
.field .err { color: var(--bad); font-size: 12px; margin-top: 4px; display: none; }
.field.invalid .err { display: block; }
.field.invalid input { border-color: var(--bad); }

.grade-choices { display: flex; gap: 8px; flex-wrap: wrap; }
.grade-opt {
  flex: 1; min-width: 64px; padding: 10px; border: 2px solid var(--line); border-radius: 10px; cursor: pointer;
  text-align: center; font-weight: 700; background: #fff; transition: .12s;
}
.grade-opt small { display: block; font-size: 10.5px; font-weight: 500; color: var(--ink-soft); }
.grade-opt.sel { border-color: var(--brand-2); background: #eef2ff; }
.grade-opt.g5.sel { border-color: var(--grade5); background: #e8f6ee; }
.grade-opt.g4.sel { border-color: var(--grade4); background: #eaf7ea; }
.grade-opt.g3.sel { border-color: var(--grade3); background: #fdf6e3; }
.grade-opt.g2.sel { border-color: var(--grade2); background: #fdeee4; }
.grade-opt.g1.sel { border-color: var(--grade1); background: #fdeef0; }

/* Data view */
.data-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.scale-legend { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.scale-item { text-align: center; padding: 12px 8px; border-radius: 11px; color: #fff; font-weight: 800; }
.scale-item small { display: block; font-weight: 500; font-size: 11px; opacity: .9; }
.scale-item.g5 { background: var(--grade5); }
.scale-item.g4 { background: var(--grade4); }
.scale-item.g3 { background: var(--grade3); }
.scale-item.g2 { background: var(--grade2); }
.scale-item.g1 { background: var(--grade1); }
.formula-list { margin: 0; padding-left: 20px; }
.formula-list li { margin-bottom: 12px; font-size: 14px; }
.formula-list code { background: #eef1f8; padding: 2px 7px; border-radius: 6px; font-size: 13px; color: var(--brand); }

.foot { text-align: center; color: var(--ink-soft); font-size: 12px; padding: 22px; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--brand); color: #fff; padding: 12px 22px; border-radius: 12px;
  font-size: 14px; font-weight: 600; z-index: 60; box-shadow: 0 8px 30px rgba(0,0,0,.25);
  animation: pop .25s ease;
}
@keyframes pop { from { opacity: 0; transform: translateX(-50%) translateY(10px); } to { opacity: 1; transform: translateX(-50%); } }

.quick-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.quick-row:last-child { margin-bottom: 0; }
.quick-row .field { flex: 1; min-width: 140px; margin-bottom: 0; }
.quick-row .field label { font-size: 12px; }
.quick-row .field input, .quick-row .field select { padding: 9px 11px; }
.quick-row .grade-choices { gap: 4px; }
.quick-row .grade-opt { min-width: 42px; padding: 6px 2px; }
.quick-row .target-field { flex: 0 0 150px; }
.quick-row .action-field { flex: 0 0 auto; display: flex; align-items: flex-end; }
.quick-row .ro-field { flex: 1.4 1 200px; }
.quick-row .ro {
  padding: 9px 11px; border: 1px dashed var(--line); border-radius: 9px; font-weight: 700;
  color: var(--brand); background: #fafbff; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
@media (max-width: 720px) {
  .quick-row .field { min-width: 130px; }
  .quick-row .target-field, .quick-row .action-field { flex: 1 1 100%; }
  .quick-row .action-field .btn { width: 100%; }
}

.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .row-2 { grid-template-columns: 1fr; } }