:root {
      --pico-font-family: "PT Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
      --pico-font-size: 100%;
      --cat-perus: #99d98c;
      --cat-ammatti: #168aad;
      --cat-valinn: #feffa5;
      --cat-oppari: #ff99c8;
      --ok-bg: #e8f5e9;
      --warn-bg: #fdecea;
      --warn-fg: #b3261e;
    }
    html, body { font-family: "PT Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
    main.container { padding-top: 1.5rem; padding-bottom: 3rem; max-width: 1280px; }
    .tag {
      display: inline-block; background: var(--pico-primary); color: var(--pico-primary-inverse);
      border-radius: 999px; padding: .15rem .7rem; font-size: .75rem; font-weight: 700;
      margin-bottom: .5rem;
    }
    h1 { margin-bottom: .3rem; }
    .lede { max-width: 78ch; }
    .toolbar { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin: 1rem 0; }
    .toolbar .spacer { flex: 1; }
    .legend { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0 0; }
    .legend span.chip {
      display: inline-flex; align-items: center; gap: .45rem; font-size: .85rem;
      border: 1px solid var(--pico-card-border-color); border-radius: .5rem; padding: .25rem .6rem;
    }
    .legend .legend-title { align-self: center; }
    .sw { width: .9rem; height: .9rem; border-radius: .25rem; border: 1px solid rgba(0,0,0,.25); flex: none; }
    /* Ajoituspoikkeaman merkki: katkoviivainen korostus (kevät-override). */
    .override-pill {
      display: inline-block; width: 1.2rem; height: .85rem;
      border: 2px dashed #6d28d9; border-radius: .45rem;
      background: rgba(109, 40, 217, .06);
      vertical-align: -.1em; margin: 0 .2rem 0 .4rem;
    }

    /* ---- matriisi ---- */
    .matrix-scroll { overflow-x: auto; border: 1px solid var(--pico-card-border-color); border-radius: var(--pico-border-radius); }
    .matrix { display: grid; min-width: 1080px; position: relative; }
    .matrix .corner, .matrix .colhead, .matrix .rowhead, .matrix .cell { padding: .5rem; }
    .matrix .corner { background: var(--pico-card-sectioning-background-color); font-size: .8rem; color: var(--pico-muted-color); }
    .matrix .colhead {
      background: var(--pico-card-sectioning-background-color); text-align: center;
      border-left: 1px solid var(--pico-card-border-color);
    }
    .matrix .colhead strong { display: block; font-size: 1rem; }
    .matrix .colhead small { color: var(--pico-muted-color); font-size: .72rem; }
    .matrix .rowhead {
      display: flex; flex-direction: column; justify-content: center; align-items: center; gap: .15rem;
      padding: .3rem .2rem;
      border-top: 1px solid var(--pico-card-border-color);
      background: var(--pico-card-background-color);
    }
    /* Riviotsikot pystyyn (90° vastapäivään), jotta ensimmäinen sarake voi olla kapea. */
    .matrix .rowhead strong {
      font-size: .95rem; writing-mode: vertical-rl; transform: rotate(180deg);
      white-space: nowrap; letter-spacing: .02em;
    }
    .matrix .rowhead small { color: var(--pico-muted-color); font-size: .75rem; }
    .matrix .cell { border-left: 1px solid var(--pico-card-border-color); border-top: 1px solid var(--pico-card-border-color); vertical-align: top; min-height: 120px; }
    .matrix .cell.empty { color: var(--pico-muted-color); font-size: .85rem; }
    .matrix .cell .stack { display: flex; flex-direction: column; gap: .4rem; }

    /* jaksosegmentit: tiivis pino ilman välejä, teksti vain hoverilla */
    .catgroup { display: flex; flex-direction: column; }
    .catgroup.has-override { outline: 2px dashed #6d28d9; outline-offset: 2px; border-radius: .5rem; }
    .seg {
      position: relative; border: 1px solid rgba(0,0,0,.22); cursor: default;
      margin-top: -1px;
    }
    .seg:first-child { margin-top: 0; border-radius: .5rem .5rem 0 0; }
    .seg:last-child { border-radius: 0 0 .5rem .5rem; }
    .seg:only-child { border-radius: .5rem; }
    .seg.cat-perusopinnot { background: var(--cat-perus); color: #12300f; }
    /* Ehdollinen perusopinto: sama lohko, tausta 50 % läpinäkyvyydellä
       (sivupalkki pysyy täysin peittävänä) + katkoviivareunus. */
    .seg.cat-perusopinnot.is-cond {
      background: rgba(153, 217, 140, .5);
      border-style: dashed;
      color: #12300f;
    }
    .seg.is-cond .tip { border-style: dashed; }
    /* Vastuualue (perus- ja valinnaiset opinnot): 6px palkki lohkon vasemmassa
       reunassa. Ehdollisella perusopintolohkolla palkki pysyy ehjänä (solid),
       muut reunat katkoviivaiset. */
    .seg.cat-perusopinnot.has-vastuu,
    .seg.cat-valinnaiset.has-vastuu { border-left: 6px solid var(--vastuu, transparent); }
    .seg.cat-perusopinnot.has-vastuu.is-cond { border-left-style: solid; }
    .seg .tip .tip-vastuu { display: inline-flex; align-items: center; gap: .35rem; }
    .seg .tip .tip-vastuu-dot {
      width: .65rem; height: .65rem; border-radius: .2rem;
      border: 1px solid rgba(0,0,0,.3); display: inline-block; flex: none;
    }
    .badge-cond {
      display: inline-block; font-size: .72rem; font-weight: 700; color: #14532d;
      background: #dcfce7; border: 1px dashed #16a34a;
      border-radius: 999px; padding: .05rem .5rem; vertical-align: middle;
    }
    input.cond-toggle { accent-color: #15803d; width: 1.1rem; height: 1.1rem; cursor: pointer; }
    input.cond-toggle:disabled { cursor: not-allowed; opacity: .3; }
    .seg.cat-ammattiopinnot { background: var(--cat-ammatti); color: #fff; }
    .seg.cat-ammattiopinnot .bsub { color: #e6f4f8; }
    .seg.cat-valinnaiset { background: var(--cat-valinn); color: #4a3f00; }
    .seg.cat-opinnaytetyo { background: var(--cat-oppari); color: #5c0a33; }

    /* Suunnitelmavaraukset (placeholderit): eivät opintojaksoja.
       Katkoviivainen reuna + viivoitus; teksti näkyy aina (toisin kuin
       varsinaisilla jaksoilla, joiden teksti on vain hover-tooltipissa). */
    .seg.ph {
      display: flex; align-items: center; justify-content: center;
      background: var(--ph, #cbd5e1); color: #334155;
      border: 2px dashed rgba(0,0,0,.4);
    }
    .seg.ph::before {
      content: ""; position: absolute; inset: 0; border-radius: inherit;
      background: repeating-linear-gradient(45deg,
        rgba(255,255,255,.55) 0 6px, transparent 6px 12px);
      pointer-events: none;
    }
    .seg.ph .ph-label {
      position: relative; z-index: 1; font-size: .72rem; font-weight: 700;
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
      padding: 0 .35rem; max-width: 100%;
    }
    /* Varaukset eivät osallistu ketjukorostukseen eivätkä ristiinkorostukseen. */
    .seg.ph:hover { box-shadow: inset 0 0 0 2px rgba(0,0,0,.3); }
    .matrix.has-chain .seg.ph { opacity: 1; }
    .badge-ov {
      display: inline-block; font-size: .68rem; font-weight: 700; background: #6d28d9; color: #fff;
      border-radius: 999px; padding: .05rem .5rem; vertical-align: middle;
    }
    .badge-warn {
      display: inline-block; font-size: .72rem; font-weight: 700; background: #b3261e; color: #fff;
      border-radius: 999px; padding: .05rem .5rem; vertical-align: middle;
    }
    /* tooltip — Picon korttiteemaan sovitettu */
    .seg .tip {
      display: none; position: absolute; z-index: 200; left: 0; top: calc(100% + 10px);
      min-width: 180px; max-width: 360px;
      background: var(--pico-card-background-color); color: var(--pico-color);
      border: 1px solid var(--pico-card-border-color); border-radius: var(--pico-border-radius);
      box-shadow: var(--pico-card-box-shadow, 0 .25rem 1rem rgba(0, 0, 0, .12));
      padding: .75rem .85rem; font-size: .82rem; font-family: inherit;
    }
    .seg .tip::before {
      content: ""; position: absolute; top: -6px; left: 26px; width: 11px; height: 11px;
      background: var(--pico-card-background-color);
      border-left: 1px solid var(--pico-card-border-color);
      border-top: 1px solid var(--pico-card-border-color);
      transform: rotate(45deg);
    }
    /* Alakaistan (kevät) kortti aukeaa ylöspäin, jottei leikkaannu reunaa vasten */
    .cell.grp-kevat .tip { top: auto; bottom: calc(100% + 10px); }
    .cell.grp-kevat .tip::before {
      top: auto; bottom: -6px; transform: rotate(225deg);
    }
    .seg:hover .tip, .seg:focus-within .tip { display: block; }
    .cell .load { margin-top: .5rem; text-align: center; }
    .load .pill-total {
      display: inline-block; font-weight: 700; font-size: .85rem; border-radius: 999px;
      padding: .15rem .8rem; border: 1px solid var(--pico-card-border-color);
      background: var(--ok-bg); color: #14532d;
    }
    .load .pill-total.off { background: var(--warn-bg); color: var(--warn-fg); border-color: #f5c6c0; }
    .load small { display: block; color: var(--pico-muted-color); font-size: .7rem; margin-top: .15rem; }

    .kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .75rem; margin: 1rem 0; }
    .kpi { border: 1px solid var(--pico-card-border-color); border-radius: var(--pico-border-radius); padding: .8rem 1rem; background: var(--pico-card-background-color); }
    .kpi .value { font-size: 1.3rem; font-weight: 700; }
    .kpi .value small { font-size: .78rem; color: var(--pico-muted-color); }
    .kpi .label { font-size: .75rem; color: var(--pico-muted-color); }

    table.edit { font-size: .83rem; }
    table.edit th, table.edit td { padding: .45rem .55rem; vertical-align: middle; }
    table.edit select { font-size: .83rem; padding: .25rem .4rem; margin: 0; min-width: 7.5rem; }
    table.edit tr.is-viol { background: #fef2f2; }
    .pill-cat { display: inline-block; border-radius: .4rem; padding: .05rem .5rem; font-size: .75rem; font-weight: 700; border: 1px solid rgba(0,0,0,.2); white-space: nowrap; }
    details.sem-detail { margin-bottom: .6rem; }
    details.sem-detail summary { cursor: pointer; font-weight: 700; }
    .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
    /* Kurssilistaus lukukausittain: saapumisryhmien otsikot ja aina auki olevat lukukaudet. */
    .sem-colheads {
      display: grid; grid-template-columns: 1fr 1fr; gap: .75rem;
      padding-bottom: .35rem; margin-bottom: .9rem;
      border-bottom: 1px solid var(--pico-card-border-color);
    }
    .sem-colheads strong { font-size: .9rem; }
    .sem-block { margin-bottom: 1.15rem; }
    .sem-title { font-size: 1rem; margin: 0 0 .35rem; }
    @media (max-width: 800px) {
      .sem-colheads { grid-template-columns: 1fr; gap: .25rem; }
    }
    @media (max-width: 800px) { .two-col { grid-template-columns: 1fr; } .seg .tip { position: fixed; left: 1rem; right: 1rem; min-width: 0; max-width: none; } }
    .muted { color: var(--pico-muted-color); font-size: .8rem; }
    .viol-box { border: 1px solid #f5c6c0; background: #fef2f2; border-radius: .5rem; padding: .6rem .8rem; font-size: .85rem; }
    .ok-box { border: 1px solid #bbf7d0; background: #f0fdf4; border-radius: .5rem; padding: .6rem .8rem; font-size: .85rem; }
    footer.page-foot { text-align: center; color: var(--pico-muted-color); font-size: .8rem; margin-top: 1rem; }
    button.small { padding: .25rem .6rem; font-size: .78rem; }

/* ---- esitietoketjut ---- */
.chain-tree, .chain-tree ul { margin: 0; padding: 0; list-style: none; }
.chain-tree li::marker { content: none; }
.chain-tree ul {
  margin: .2rem 0 .2rem .55rem; padding-left: 1rem;
  border-left: 2px solid var(--pico-muted-border-color, var(--pico-card-border-color));
}
.chain-tree li { margin: .35rem 0; font-size: .87rem; }
.chain-tree .chain-meta { display: block; color: var(--pico-muted-color); font-size: .75rem; }

/* poikkeava kevät-override erottuu keltaisella taustalla */
table.edit select.ov-active {
  background-color: #fef9c3;
  border-color: #eab308;
}

/* ristiinkorostus: sama jakso toisessa kaistassa (sisävarjo vaalentaa;
   ei filteriä, jotta tooltip ei jää lohkojen taakse) */
.seg.peer-hl { box-shadow: inset 0 0 0 100px rgba(255, 255, 255, .38); }
.seg.chain-viol.peer-hl {
  box-shadow: inset 0 0 0 2px var(--pico-del-color, #b3261e),
    inset 0 0 0 100px rgba(255, 255, 255, .38);
}

/* rikkinäinen esitietoketju: punainen reuna (sisävarjo, ei riko tiivistä pinoa) */
.seg.chain-viol { box-shadow: inset 0 0 0 2px var(--pico-del-color, #b3261e); }

/* klikattava kategoriatagi taulukossa */
.pill-cat.clickable-cat { cursor: pointer; }
.pill-cat.clickable-cat:hover { outline: 2px solid var(--pico-primary); outline-offset: 1px; }

/* ketjukorostus: hover ketjun jäsenen päällä himmentää muut ja piirtää
   jouhevan viivan ketjun läpi molemmissa kaistoissa (SVG-overlay) */
.chain-overlay {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 25; overflow: visible;
}
.chain-overlay .chain-halo {
  fill: none; stroke: rgba(255, 255, 255, .95); stroke-width: 7;
  stroke-linecap: round; stroke-linejoin: round;
}
.chain-overlay .chain-line {
  fill: none; stroke: #6d28d9; stroke-width: 3;
  stroke-linecap: round; stroke-linejoin: round;
}
.chain-overlay .chain-dot { fill: #6d28d9; stroke: #fff; stroke-width: 2; }
/* S/K-siirtoviiva: saman jakson syksy- ja kevätpaikan välillä (harmaa katkoviiva) */
.chain-overlay .move-halo {
  fill: none; stroke: rgba(255, 255, 255, .95); stroke-width: 7;
  stroke-linecap: round; stroke-linejoin: round;
}
.chain-overlay .move-line {
  fill: none; stroke: #6b7280; stroke-width: 3; stroke-dasharray: 7 5;
  stroke-linecap: round; stroke-linejoin: round;
}
.chain-overlay .move-dot { fill: #6b7280; stroke: #fff; stroke-width: 2; }
.matrix.has-chain .seg { opacity: .35; }
.matrix.has-chain .seg.chain-hl {
  opacity: 1; outline: 2px solid #6d28d9; outline-offset: 1px; z-index: 5;
}

/* drag & drop */
.seg[draggable="true"] { cursor: grab; }
.seg.dragging { opacity: .45; cursor: grabbing; }
.cell.drop-hint { outline: 2px dashed var(--pico-primary); outline-offset: -2px; background-color: var(--pico-card-sectioning-background-color); }

/* Hover-tooltip aina kaikkien ylle: oltava tiedoston lopussa, jotta ohittaa
   ketjukorostuksen z-index:5; !important varmistaa voiton himmennettyjen
   (opacity-stacking) segmenttien yli. */
.matrix .seg:hover, .matrix .seg:focus-within { z-index: 200 !important; }
.matrix .seg:hover .tip, .matrix .seg:focus-within .tip { z-index: 200; }

/* Kurssilistaus lukukausittain: ei luettelomerkkejä, puuttuva harmaana yliviivattuna */
.course-list { margin: .4rem 0 0; padding: 0; }
.course-row { padding: .15rem 0; }
.course-row .course-name { font-weight: 400; }
.course-row.is-missing { color: var(--pico-muted-color); }
.course-row.is-missing .course-name { text-decoration: line-through; }
.badge-valinnainen {
  display: inline-block; font-size: .75rem; font-weight: 700; color: #14532d;
  background: #dcfce7; border: 1px solid #16a34a;
  border-radius: 999px; padding: .05rem .5rem; vertical-align: middle;
}

/* Poikkeavat ajoitukset: kurssi = 2 riviä (S ylhäällä, K alla), osuva solu vihreä */
.ov-table { border-collapse: collapse; font-size: .85rem; width: 100%; }
.ov-table th, .ov-table td { border: 1px solid var(--pico-card-border-color); padding: .3rem .5rem; text-align: center; }
.ov-table thead th { background: var(--pico-card-sectioning-background-color); }
.ov-table th:first-child, .ov-table td.ov-name { text-align: left; }
.ov-table td.ov-name { vertical-align: middle; }
.ov-table td.ov-hit { background: #99d98c; font-weight: 700; color: #12300f; }
.ov-table td.ov-group { white-space: nowrap; color: var(--pico-muted-color); }
/* Kurssiparin (2 riviä) alareuna vahvempana, jotta jaksojen rajat erottuvat */
.ov-table tbody tr.ov-row-k td { border-bottom: 5px solid var(--pico-muted-border-color, #9ca3af); }
.ov-table tbody tr.ov-row-s td.ov-name { border-bottom: 5px solid var(--pico-muted-border-color, #9ca3af); }

/* Perusopinnot vastuualueittain -accordion */
.vastuu-group { margin-bottom: 1rem; }
.vastuu-group:last-child { margin-bottom: 0; }
.vastuu-group-head { display: flex; align-items: center; gap: .45rem; margin: .1rem 0 .4rem; }
.vastuu-table { width: 100%; }
.vastuu-table th, .vastuu-table td { font-size: .82rem; }

/* Valmistumismilestone S27-ryhmän K31- ja K28-ryhmän S31-lukukaudella */
.matrix .cell.milestone {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .4rem;
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
  color: #14532d; text-align: center;
}
.milestone-inner {
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  font-size: .82rem; font-weight: 700; line-height: 1.2; max-width: 12rem;
}
.matrix .cell.milestone .stack { width: 100%; }