/* Homework dashboard.
   Design goal: one glance answers "what do I have to do and when".
   Colour carries urgency, size carries priority, and it has to work on a
   phone, since that is where it will actually get checked. */

:root {
    --bg: #f6f7f9;
    --card: #ffffff;
    --ink: #1b1f24;
    --ink-soft: #5b6570;
    --line: #e3e6ea;
    --accent: #2563eb;
    --late: #c8102e;
    --late-bg: #fdeced;
    --soon: #b45309;
    --soon-bg: #fef4e6;
    --ok: #15803d;
    --ok-bg: #edf7ee;
    --radius: 10px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171a;
        --card: #1d2125;
        --ink: #e8eaed;
        --ink-soft: #9aa4af;
        --line: #2e343a;
        --accent: #6ea8fe;
        --late: #ff7b8a;
        --late-bg: #3a1d22;
        --soon: #f0b357;
        --soon-bg: #382a17;
        --ok: #7ddc9a;
        --ok-bg: #16301f;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.5;
}

/* --- header --- */
header {
    background: var(--card);
    border-bottom: 1px solid var(--line);
    padding: 0.85rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}

header nav { display: flex; align-items: center; gap: 0.5rem; }

header nav a {
    color: var(--ink-soft);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
}

header nav a:hover { background: var(--bg); color: var(--ink); }

.avatar {
    width: 30px; height: 30px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: grid; place-items: center;
    font-weight: 700; font-size: 0.85rem;
}

/* --- layout --- */
main {
    max-width: 780px;
    margin: 0 auto;
    padding: 1.25rem 1rem 4rem;
}

.semester-line {
    color: var(--ink-soft);
    font-size: 0.85rem;
    margin-bottom: 1.25rem;
}

h1 { font-size: 1.5rem; margin: 0 0 0.25rem; letter-spacing: -0.02em; }

h2 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ink-soft);
    margin: 1.75rem 0 0.6rem;
}

/* --- summary strip --- */
.strip { display: flex; gap: 0.6rem; margin-bottom: 0.5rem; flex-wrap: wrap; }

.tile {
    flex: 1 1 130px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.8rem 0.9rem;
}

.tile .n { font-size: 1.7rem; font-weight: 700; line-height: 1.1; }
.tile .l { font-size: 0.78rem; color: var(--ink-soft); }
.tile.late { background: var(--late-bg); border-color: transparent; }
.tile.late .n { color: var(--late); }
.tile.soon { background: var(--soon-bg); border-color: transparent; }
.tile.soon .n { color: var(--soon); }

/* --- assignment cards --- */
.item {
    background: var(--card);
    border: 1px solid var(--line);
    border-left: 4px solid var(--line);
    border-radius: var(--radius);
    padding: 0.8rem 0.9rem;
    margin-bottom: 0.55rem;
    display: block;
    text-decoration: none;
    color: inherit;
}

.item:hover { border-color: var(--accent); }
.item.overdue { border-left-color: var(--late); }
.item.today { border-left-color: var(--late); }
.item.soon { border-left-color: var(--soon); }
.item.later { border-left-color: var(--ok); }

.item .title { font-weight: 600; margin-bottom: 0.15rem; }
.item .course { font-size: 0.8rem; color: var(--ink-soft); }

.item .when {
    font-size: 0.82rem;
    margin-top: 0.4rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.75rem;
    align-items: center;
}

.badge {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15rem 0.45rem;
    border-radius: 999px;
}

.badge.late { background: var(--late-bg); color: var(--late); }
.badge.today { background: var(--late-bg); color: var(--late); }
.badge.soon { background: var(--soon-bg); color: var(--soon); }
.badge.later { background: var(--ok-bg); color: var(--ok); }

.grace { color: var(--ink-soft); font-size: 0.8rem; }
.grace strong { color: var(--soon); }
.grace.closed strong { color: var(--late); }

/* --- misc --- */
.empty {
    background: var(--card);
    border: 1px dashed var(--line);
    border-radius: var(--radius);
    padding: 1.1rem;
    color: var(--ink-soft);
    text-align: center;
}

.courses { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.chip {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.25rem 0.7rem;
    font-size: 0.82rem;
}

.note {
    font-size: 0.8rem;
    color: var(--ink-soft);
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}

.err {
    background: var(--late-bg);
    color: var(--late);
    border-radius: var(--radius);
    padding: 0.9rem 1rem;
    font-size: 0.9rem;
}

/* --- login --- */
.center {
    min-height: 82vh;
    display: grid;
    place-items: center;
    padding: 1rem;
}

.card-lg {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 2.25rem;
    max-width: 380px;
    width: 100%;
    text-align: center;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    padding: 0.65rem 1.3rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn.subtle { background: transparent; color: var(--ink-soft); border: 1px solid var(--line); }

/* --- admin table --- */
table { width: 100%; border-collapse: collapse; background: var(--card);
        border-radius: var(--radius); overflow: hidden; }
th, td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line);
         font-size: 0.9rem; }
th { font-size: 0.75rem; text-transform: uppercase; color: var(--ink-soft); }
select { padding: 0.3rem; border-radius: 6px; border: 1px solid var(--line);
         background: var(--bg); color: var(--ink); }

@media (max-width: 540px) {
    .tile .n { font-size: 1.4rem; }
    main { padding: 1rem 0.85rem 3rem; }
}

/* ---------- assignment page ---------- */
.back { display:inline-block; color:var(--ink-soft); text-decoration:none;
        font-size:0.85rem; margin-bottom:0.9rem; }
.back:hover { color:var(--accent); }

.course-tag { font-size:0.8rem; color:var(--ink-soft); text-transform:uppercase;
              letter-spacing:0.05em; }

.due-bar { display:flex; justify-content:space-between; align-items:center;
           gap:1rem; flex-wrap:wrap;
           background:var(--card); border:1px solid var(--line);
           border-left:4px solid var(--ok);
           border-radius:var(--radius); padding:0.85rem 1rem; margin:1rem 0; }
.due-bar.overdue, .due-bar.today { border-left-color:var(--late); }
.due-bar.soon { border-left-color:var(--soon); }
.due-label { font-size:0.72rem; text-transform:uppercase; letter-spacing:0.06em;
             color:var(--ink-soft); }
.due-when { font-weight:700; font-size:1.05rem; }
.due-note { font-size:0.82rem; color:var(--ink-soft); margin-top:0.15rem; }
.due-meta { display:flex; gap:0.5rem; flex-wrap:wrap; }
.due-meta span { font-size:0.78rem; background:var(--bg); border:1px solid var(--line);
                 border-radius:999px; padding:0.15rem 0.6rem; color:var(--ink-soft); }

.grace-line { font-size:0.85rem; color:var(--ink-soft); margin:-0.4rem 0 0.5rem; }
.grace-line strong { color:var(--soon); }
.grace-line.closed strong { color:var(--late); }

/* The one line that matters most. */
.headline { font-size:1.2rem; font-weight:600; line-height:1.4;
            background:var(--card); border:1px solid var(--line);
            border-radius:var(--radius); padding:1rem 1.1rem; margin:1.25rem 0 0.25rem; }

.steps { padding-left:1.3rem; margin:0.4rem 0; }
.steps li { margin-bottom:0.45rem; }

.time { font-size:0.88rem; color:var(--ink-soft); margin:0.75rem 0 0; }

.watch { padding-left:1.2rem; margin:0.4rem 0; }
.watch li { margin-bottom:0.35rem; }

.terms { margin:0.4rem 0; }
.terms dt { font-weight:650; font-size:0.92rem; }
.terms dd { margin:0.1rem 0 0.6rem; color:var(--ink-soft); font-size:0.9rem; }

.background { font-size:0.93rem; }

.ask { background:var(--soon-bg); border-left:3px solid var(--soon);
       border-radius:8px; padding:0.75rem 0.9rem; font-size:0.88rem;
       margin-top:1.1rem; }

/* Teacher-authored HTML lands here; it is sanitised in app/htmlclean.py. */
.verbatim { background:var(--card); border:1px solid var(--line);
            border-radius:var(--radius); padding:0.9rem 1.1rem; font-size:0.93rem; }
.verbatim p:first-child { margin-top:0; }
.verbatim p:last-child { margin-bottom:0; }
.verbatim a { color:var(--accent); word-break:break-word; }
.verbatim table { font-size:0.85rem; margin:0.5rem 0; }
.verbatim img { max-width:100%; height:auto; }

.links { padding-left:1.2rem; font-size:0.9rem; }
.links a { color:var(--accent); word-break:break-word; }

.canvas-out { margin-top:1.6rem; display:flex; align-items:center; gap:0.8rem;
              flex-wrap:wrap; }
.canvas-note { font-size:0.8rem; color:var(--ink-soft); }