/* kslucorner.in
   A study utility, not an essay site: dense, scannable, mobile first,
   and legible at 1am. Light and dark, both deliberate. */

:root {
  --navy:       #14395c;
  --navy-deep:  #0d2740;
  --navy-pale:  #eaf0f6;
  --gold:       #a76b1f;

  --ink:        #16202b;
  --ink-soft:   #46566a;
  --ink-faint:  #6d7d8f;
  --paper:      #ffffff;
  --paper-alt:  #f6f8fa;
  --rule:       #dfe5ec;
  --shadow:     0 1px 2px rgba(20, 57, 92, .06);

  --measure:    72rem;
  --prose:      42rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --navy:      #7fb3e0;
    --navy-deep: #a8cdec;
    --navy-pale: #16273a;
    --gold:      #d7a55c;

    --ink:       #e6edf4;
    --ink-soft:  #a9b8c8;
    --ink-faint: #7d8ea0;
    --paper:     #0e1620;
    --paper-alt: #141f2c;
    --rule:      #24333f;
    --shadow:    none;
  }
}

:root[data-theme="dark"] {
  --navy:      #7fb3e0;
  --navy-deep: #a8cdec;
  --navy-pale: #16273a;
  --gold:      #d7a55c;

  --ink:       #e6edf4;
  --ink-soft:  #a9b8c8;
  --ink-faint: #7d8ea0;
  --paper:     #0e1620;
  --paper-alt: #141f2c;
  --rule:      #24333f;
  --shadow:    none;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 1.25rem; }
.wrap.prose { max-width: var(--prose); }

a { color: var(--navy); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--navy-deep); }

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}
.masthead .wrap {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 3.75rem;
  flex-wrap: wrap;
}
.brand {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--navy);
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover { color: var(--navy-deep); }
.brand .dot { color: var(--gold); }

nav.site { display: flex; gap: 1.1rem; font-size: .9375rem; margin-left: auto; flex-wrap: wrap; }
nav.site a { color: var(--ink-soft); text-decoration: none; }
nav.site a:hover, nav.site a[aria-current="page"] { color: var(--navy); }
nav.site a[aria-current="page"] { font-weight: 600; }

/* ---------- breadcrumb ---------- */

.crumbs {
  font-size: .875rem;
  color: var(--ink-faint);
  padding: 1.1rem 0 0;
}
.crumbs a { color: var(--ink-faint); text-decoration: none; }
.crumbs a:hover { color: var(--navy); text-decoration: underline; }
.crumbs span { padding: 0 .4rem; opacity: .55; }

/* ---------- page head ---------- */

.page-head { padding: .75rem 0 1.5rem; border-bottom: 1px solid var(--rule); margin-bottom: 1.75rem; }
.page-head h1 { margin: 0; font-size: 1.75rem; line-height: 1.25; letter-spacing: -0.02em; }
.page-head p { margin: .5rem 0 0; color: var(--ink-soft); max-width: var(--prose); }
.page-head .meta { margin-top: .6rem; font-size: .875rem; color: var(--ink-faint); }

/* ---------- hero (home only) ---------- */

.hero { padding: 3rem 0 2.5rem; border-bottom: 1px solid var(--rule); }
.hero h1 { margin: 0; font-size: clamp(1.9rem, 4.5vw, 2.6rem); line-height: 1.15; letter-spacing: -0.03em; }
.hero p { margin: .85rem 0 0; font-size: 1.0625rem; color: var(--ink-soft); max-width: 38rem; }
.hero .counts { margin: 1.6rem 0 0; display: flex; gap: 2.25rem; flex-wrap: wrap; }
.hero .counts b { display: block; font-size: 1.5rem; color: var(--navy); letter-spacing: -0.02em; }
.hero .counts span { font-size: .8125rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .06em; }

/* ---------- search ---------- */

.searchbar { margin: 1.5rem 0 0; position: relative; max-width: 34rem; }
.searchbar input {
  width: 100%;
  font: inherit;
  padding: .7rem .9rem;
  color: var(--ink);
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  border-radius: .5rem;
}
.searchbar input:focus { outline: 2px solid var(--navy); outline-offset: 1px; background: var(--paper); }
.searchbar input::placeholder { color: var(--ink-faint); }

#results { margin: 1.25rem 0 0; }
#results .hit { padding: .7rem 0; border-bottom: 1px solid var(--rule); }
#results .hit a { font-weight: 600; text-decoration: none; }
#results .hit .where { display: block; font-size: .8125rem; color: var(--ink-faint); margin-top: .15rem; }
.empty { color: var(--ink-faint); font-style: italic; }

/* ---------- card grid ---------- */

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr)); margin: 0; padding: 0; list-style: none; }
.card {
  display: block;
  padding: 1.1rem 1.15rem;
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  border-radius: .6rem;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: border-color .12s ease, transform .12s ease;
}
.card:hover { border-color: var(--navy); transform: translateY(-1px); }
.card b { display: block; font-size: 1.0625rem; color: var(--navy); letter-spacing: -0.01em; }
.card small { display: block; margin-top: .3rem; color: var(--ink-faint); font-size: .8125rem; }

/* compact chips, used for semesters */
.chips { display: flex; flex-wrap: wrap; gap: .6rem; list-style: none; margin: 0; padding: 0; }
.chips a {
  display: block;
  padding: .55rem .95rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper-alt);
  text-decoration: none;
  font-size: .9375rem;
  color: var(--ink);
}
.chips a:hover { border-color: var(--navy); color: var(--navy); }
.chips a small { color: var(--ink-faint); font-size: .8125rem; }

/* ---------- subject list ---------- */

.subjects { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.subjects li { border-bottom: 1px solid var(--rule); }
.subjects a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: .85rem .25rem;
  text-decoration: none;
  color: inherit;
}
.subjects a:hover { background: var(--paper-alt); }
.subjects .name { font-weight: 600; color: var(--navy); }
.subjects .years { margin-left: auto; font-size: .8125rem; color: var(--ink-faint); white-space: nowrap; }
.subjects .n { font-size: .8125rem; color: var(--ink-faint); }

/* ---------- papers table ---------- */

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.papers { width: 100%; border-collapse: collapse; font-size: .9375rem; }
table.papers th {
  text-align: left;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-faint);
  font-weight: 600;
  padding: 0 .75rem .55rem 0;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
table.papers td { padding: .6rem .75rem .6rem 0; border-bottom: 1px solid var(--rule); vertical-align: baseline; }
table.papers tr:hover td { background: var(--paper-alt); }
table.papers .session { font-weight: 600; white-space: nowrap; }
table.papers .marks { color: var(--ink-soft); white-space: nowrap; }
table.papers .size { color: var(--ink-faint); font-size: .8125rem; white-space: nowrap; }
table.papers .dl { text-align: right; white-space: nowrap; }

.btn {
  display: inline-block;
  padding: .3rem .7rem;
  border: 1px solid var(--rule);
  border-radius: .35rem;
  background: var(--paper);
  color: var(--navy);
  font-size: .875rem;
  font-weight: 600;
  text-decoration: none;
}
.btn:hover { border-color: var(--navy); background: var(--navy-pale); }
.btn[aria-disabled="true"] { color: var(--ink-faint); border-style: dashed; pointer-events: none; font-weight: 400; }

/* ---------- prose ---------- */

.prose h2 { margin: 2.25rem 0 .6rem; font-size: 1.25rem; letter-spacing: -0.015em; }
.prose h3 { margin: 1.6rem 0 .4rem; font-size: 1.0625rem; }
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose li { margin: .3rem 0; }
.note {
  margin: 1.5rem 0;
  padding: .9rem 1.05rem;
  background: var(--navy-pale);
  border-left: 3px solid var(--navy);
  border-radius: 0 .35rem .35rem 0;
  font-size: .9375rem;
  color: var(--ink-soft);
}

/* ---------- syllabus ---------- */

ul.syl { list-style: none; padding: 0; margin: .4rem 0 0; }
ul.syl > li { margin: 0; padding: .45rem 0; border-bottom: 1px solid var(--rule); }
ul.syl li.group { padding: .6rem 0 .5rem; }
ul.syl li.group > ul { list-style: none; padding: 0 0 0 .9rem; margin: .35rem 0 0; border-left: 2px solid var(--rule); }
ul.syl li.group > ul > li { padding: .2rem 0; border: 0; }

.gname {
  display: inline-block;
  font-size: .6875rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  font-weight: 700;
  color: var(--ink-faint);
}
.lbl { color: var(--ink-faint); font-size: .875rem; }
.unlinked { color: var(--ink-soft); }
.pc { font-size: .8125rem; color: var(--ink-faint); }

.tag {
  display: inline-block;
  font-size: .6875rem;
  padding: .1rem .45rem;
  border-radius: .25rem;
  border: 1px solid var(--rule);
  color: var(--ink-faint);
  vertical-align: baseline;
  white-space: nowrap;
}
.tag.new { color: var(--navy); border-color: var(--navy); background: var(--navy-pale); }
.tag.old { text-decoration: line-through; text-decoration-thickness: 1px; }

/* ---------- footer ---------- */

footer.site {
  margin-top: 4rem;
  padding: 1.75rem 0 3rem;
  border-top: 1px solid var(--rule);
  font-size: .875rem;
  color: var(--ink-faint);
}
footer.site a { color: var(--ink-faint); }
footer.site p { margin: .35rem 0; }

@media (max-width: 34rem) {
  .masthead .wrap { min-height: 3.25rem; gap: .75rem; }
  nav.site { gap: .85rem; font-size: .875rem; width: 100%; margin-left: 0; padding-bottom: .6rem; }
  .page-head h1 { font-size: 1.4rem; }
  .hero { padding: 2rem 0 1.75rem; }
  .hero .counts { gap: 1.5rem; }
}