/* Messages: the student's page (inbox.js) and the teacher's Messages tab (tinbox.js). Square corners, as everything
   clickable on the site. */
.top-nav .nav-count { display: inline-block; min-width: 17px; margin-left: 4px; padding: 0 5px; border-radius: 4px; background: #fff; color: var(--terra); font-size: 11px; font-weight: 700; line-height: 17px; text-align: center; }
.top-nav a.on .nav-count { color: var(--terra); }

.ib-wrap { max-width: 820px; }
.ib-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.ib-h { font-family: var(--serif); font-weight: 700; font-size: 40px; line-height: 1.05; color: var(--navy); margin: 0; }
.ib-h.small { font-size: 28px; margin: 0 0 18px; }
.ib-card { padding: 6px 0; }
.ib-thread, .ib-card form { padding: 26px 28px; }
.ib-note { color: var(--mute); font-size: 14.5px; line-height: 1.6; margin: 0 0 14px; }
.ib-card > .ib-note { padding: 18px 24px; margin: 0; }
.ib-empty { color: var(--mute); text-align: center; padding: 34px 20px; margin: 0; }
.ib-err { color: #9A3A22; font-size: 14px; margin: 10px 0; }
.ib-row { display: grid; grid-template-columns: 76px 1fr auto; gap: 14px; align-items: baseline; padding: 15px 24px; border-top: 1px solid var(--line-soft); color: var(--ink); text-decoration: none; }
.ib-row:first-child { border-top: 0; }
.ib-row:hover { background: rgba(31, 46, 61, 0.035); }
.ib-from { font-size: 12.5px; font-weight: 600; color: var(--mute); }
.ib-main { min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.ib-subj { font-weight: 500; color: var(--navy); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ib-row.new .ib-subj, .ib-row.new .ib-from { font-weight: 700; color: var(--navy); }
.ib-prev { font-size: 14px; color: var(--mute); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ib-when { font-size: 12.5px; color: var(--mute); white-space: nowrap; display: flex; align-items: center; gap: 8px; }
.ib-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--terra); display: inline-block; }
.ib-back { display: inline-block; margin-bottom: 14px; font-size: 13.5px; font-weight: 600; color: var(--navy); }
.ib-back::before { content: "\2190\00a0"; }
.ib-msg { padding: 14px 0; border-top: 1px solid var(--line-soft); }
.ib-msg:first-of-type { border-top: 0; }
.ib-meta { font-size: 13px; color: var(--mute); margin-bottom: 6px; }
.ib-meta b { color: var(--navy); }
.ib-msg.them .ib-meta b { color: var(--terra); }
.ib-text { font-size: 16px; line-height: 1.7; color: var(--ink); overflow-wrap: anywhere; }
.ib-problem { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 16px 18px; margin: 0 0 16px; }
.ib-problem .eyebrow { margin-bottom: 8px; }
.ib-problem svg { max-width: 100%; height: auto; }
.ib-typed { font-size: 14px; color: var(--mute); margin: 10px 0 0; }
.ib-reply, .ib-form { display: flex; flex-direction: column; gap: 12px; }
.ib-thread .ib-reply { padding: 18px 0 0; border-top: 1px solid var(--line); margin-top: 6px; }
.ib-reply label, .ib-form label { font-size: 13px; font-weight: 600; color: var(--navy); display: flex; flex-direction: column; gap: 6px; }
.ib-reply textarea, .ib-form textarea, .ib-form input, .ib-form select { font: inherit; font-weight: 400; font-size: 15.5px; padding: 10px 12px; border: 1px solid var(--line); border-radius: var(--r-btn); background: #fff; color: var(--ink); }
.ib-reply textarea:focus, .ib-form textarea:focus, .ib-form input:focus, .ib-form select:focus { outline: 2px solid rgba(31, 46, 61, 0.35); outline-offset: 1px; }
.ib-reply .btn, .ib-btns .btn { align-self: flex-start; }
.ib-btns { display: flex; gap: 10px; flex-wrap: wrap; }
@media (max-width: 620px) {
  .ib-h { font-size: 32px; }
  .ib-row { grid-template-columns: 1fr auto; padding: 14px 16px; }
  .ib-from { display: none; }
  .ib-thread, .ib-card form { padding: 20px 16px; }
}

/* The teacher's Messages tab */
.ti-row { display: grid; grid-template-columns: 150px 1fr auto; gap: 14px; align-items: baseline; padding: 13px 20px; border-top: 1px solid var(--line-soft); cursor: pointer; background: none; border-left: 0; border-right: 0; border-bottom: 0; width: 100%; text-align: left; font: inherit; color: var(--ink); }
.ti-row:first-child { border-top: 0; }
.ti-row:hover { background: rgba(31, 46, 61, 0.035); }
.ti-row .ib-from { color: var(--navy); }
.ti-row.new .ib-subj, .ti-row.new .ib-from { font-weight: 700; }
.ti-list { padding: 4px 0; }
.ti-kind { font-size: 11px; font-weight: 600; color: var(--mute); margin-left: 6px; }
.ti-tools { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
@media (max-width: 620px) { .ti-row { grid-template-columns: 1fr auto; } .ti-row .ib-from { display: block; grid-column: 1 / -1; } }

.ti-reply-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.ti-ai-note { margin: 0; }
.ti-style { margin-top: 16px; }
.ti-style summary { cursor: pointer; font-size: 13.5px; font-weight: 600; color: var(--navy); }
.ti-style .ib-form { padding: 10px 0 0; }
.ti-preview { background: var(--panel); border: 1px dashed var(--line); border-radius: var(--r); padding: 12px 16px; }
.ti-preview .eyebrow { margin-bottom: 6px; }

/* A homework grading sheet (sheet.js), in the layout of Dr. Nick's graded PDFs */
.gs-wrap { margin: 18px 0; }
.gs { background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 30px 34px 22px; max-width: 760px; color: #1f1f1f; font-size: 16px; line-height: 1.6; }
.gs-title { display: flex; align-items: center; gap: 14px; }
.gs-num { font-family: var(--serif); font-weight: 700; font-size: 60px; line-height: 1; min-width: 56px; text-align: right; }
.gs-rule { width: 1.5px; align-self: stretch; background: #1f1f1f; }
.gs-h { font-family: var(--serif); font-weight: 700; font-size: 32px; line-height: 1.1; }
.gs-sub { font-style: italic; font-size: 18px; margin-top: 3px; }
.gs-line { border-top: 0.5px solid #1f1f1f; margin: 16px 0 14px; }
.gs-p { margin: 0 0 6px; }
.gs-sec { font-weight: 700; font-size: 18px; margin: 18px 0 8px; }
.gs-c { margin: 0 0 14px; }
.gs-math { margin: 8px 0; overflow-x: auto; }
/* KaTeX draws an equation's \tag in an element of class "tag", which the site also uses for its small labels (practice.css).
   Inside a sheet it is set back to plain math type. */
.gs .katex .tag { font-size: inherit; font-weight: inherit; letter-spacing: normal; text-transform: none; color: inherit; margin: 0; }
.gs-foot { border-top: 0.5px solid #1f1f1f; margin-top: 24px; padding-top: 6px; font-size: 13px; }
.gs-btns { margin-bottom: 8px; }
@media (max-width: 620px) { .gs { padding: 20px 16px; } .gs-num { font-size: 44px; min-width: 40px; } .gs-h { font-size: 24px; } }
@media print { .gs { border: 0; padding: 0; } }

/* The grading editor on the teacher page (tgrade.js) */
.tg-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.tg-prev { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow: auto; }
.tg-prev .gs { border: 0; padding: 8px 4px; }
.tg-row { padding: 12px 0; border-top: 1px solid var(--line-soft); display: grid; grid-template-columns: 1fr auto; gap: 8px 12px; align-items: center; }
.tg-comment, .tg-flag { grid-column: 1 / -1; }
.tg-row:first-child { border-top: 0; }
.tg-row.lost .tg-n { color: #9A3A22; }
.tg-n { font-weight: 700; font-size: 14px; display: flex; gap: 8px; align-items: center; }
.tg-mark, .tg-comment { display: flex; flex-direction: column; gap: 4px; font-size: 12px; font-weight: 600; color: var(--mute); }
.tg-mark { flex-direction: row; align-items: center; gap: 8px; }
.tg-mark select, .tg-comment textarea { font: inherit; font-size: 14px; font-weight: 400; color: var(--ink); padding: 7px 9px; border: 1px solid var(--line); border-radius: var(--r-btn); background: #fff; }
.tg-comment textarea { font-family: ui-monospace, Menlo, monospace; font-size: 12.5px; line-height: 1.5; }
.tg-flag { margin: 0; font-size: 13px; color: #9A3A22; }
.tg-score { font-weight: 700; color: var(--navy); margin: 8px 0 0; }
.tg-ai-note { font-size: 14px; background: var(--terra-tint); border-radius: 4px; padding: 8px 12px; margin: 8px 0; }
.tg-go { margin-top: 16px; align-items: center; }
.tg-set { align-items: center; flex-wrap: wrap; gap: 14px; }
.tg-set .field input { width: 90px; }
@media (max-width: 900px) { .tg-grid { grid-template-columns: 1fr; } .tg-prev { position: static; max-height: none; } }

/* The Diagnostics tab (tdiag.js) */
.td-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 12px; }
.td-missed { margin-top: 14px; }
.td-missed summary { cursor: pointer; font-weight: 600; color: var(--navy); }
.td-miss { border-top: 1px solid var(--line-soft); padding: 10px 0; font-size: 14.5px; line-height: 1.55; display: flex; flex-direction: column; gap: 3px; }
.td-link { margin-top: 16px; font-size: 14.5px; }
.td-link code { background: var(--panel); border: 1px solid var(--line); padding: 2px 6px; border-radius: 4px; word-break: break-all; }
@media (max-width: 760px) { .td-grid { grid-template-columns: 1fr; } }