/* ==========================================================================
   CS345 Student Tools - site shell
   Campbellsville maroon (#851632) on warm white. No build step, no imports.
   ========================================================================== */

:root {
  /* Brand */
  --maroon:        #851632;
  --maroon-dark:   #5f0f24;
  --maroon-light:  #a8324a;
  --maroon-tint:   #f7ebee;
  --maroon-line:   #e6ccd3;

  /* Neutrals */
  --ink:     #1b1b1f;
  --ink-2:   #4a4a52;
  --ink-3:   #73737d;
  --line:    #e3e2e0;
  --line-2:  #efeeec;
  --surface: #ffffff;
  --page:    #f7f6f4;

  /* Semantic */
  --good:    #1c6f47;  --good-bg: #e7f4ec;  --good-line: #b9dfc9;
  --bad:     #a8231c;  --bad-bg:  #fdeceb;  --bad-line:  #f2c4c1;
  --warn:    #8a5a00;  --warn-bg: #fff5e2;  --warn-line: #eddcb4;
  --info:    #1b4f72;  --info-bg: #e9f1f7;  --info-line: #c2d8e8;

  /* Type */
  --font-display: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  /* Metrics */
  --wrap: 1140px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 2px rgba(27, 27, 31, .06), 0 4px 12px rgba(27, 27, 31, .06);
  --shadow-lg: 0 8px 32px rgba(27, 27, 31, .14);
  --header-h: 62px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--page);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1 0 auto; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 20px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

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

:focus-visible {
  outline: 2px solid var(--maroon);
  outline-offset: 2px;
  border-radius: 3px;
}

.mono { font-family: var(--font-mono); font-variant-ligatures: none; }

/* ---- Header + nav -------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--maroon);
  color: #fff;
  box-shadow: 0 1px 0 rgba(0, 0, 0, .18);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}
.brand-course {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: .04em;
  padding: 2px 7px;
  border: 1.5px solid rgba(255, 255, 255, .5);
  border-radius: 5px;
}
.brand-name { font-family: var(--font-display); font-size: 1.08rem; font-weight: 400; }
.brand:hover .brand-course { border-color: #fff; }

.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-group { position: relative; }

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: inherit;
  font-weight: 600;
  font-size: .92rem;
  color: #fff;
  background: none;
  border: 0;
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
}
.nav-trigger:hover,
.nav-group:hover .nav-trigger,
.nav-group.is-open .nav-trigger { background: rgba(255, 255, 255, .14); }

.nav-sub {
  font-weight: 400;
  font-size: .76rem;
  opacity: .72;
  font-family: var(--font-mono);
}

.nav-caret { width: 9px; height: 6px; opacity: .8; transition: transform .15s; }
.nav-group:hover .nav-caret,
.nav-group.is-open .nav-caret { transform: rotate(180deg); }

.nav-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 268px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  list-style: none;
  margin: 0;
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity .14s, transform .14s, visibility .14s;
}
.nav-group:hover .nav-menu,
.nav-group:focus-within .nav-menu,
.nav-group.is-open .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.nav-menu a {
  display: block;
  padding: 8px 11px;
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  font-size: .92rem;
  line-height: 1.35;
}
.nav-menu a:hover { background: var(--maroon-tint); color: var(--maroon-dark); }
.nav-menu a.is-active {
  background: var(--maroon);
  color: #fff;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
  color: #fff;
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  content: "";
}
.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before { position: absolute; top: -7px; }
.nav-toggle-bars::after  { position: absolute; top: 7px; }

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .site-header.is-nav-open .site-nav { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: 10px; }
  .nav-trigger { width: 100%; justify-content: flex-start; color: var(--ink); }
  .nav-trigger:hover,
  .nav-group.is-open .nav-trigger { background: var(--maroon-tint); }
  .nav-sub { margin-left: auto; }
  .nav-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: 0;
    border-left: 2px solid var(--maroon-line);
    border-radius: 0;
    margin: 2px 0 8px 14px;
    display: none;
    min-width: 0;
  }
  /* On touch, hover must not open anything - only the explicit is-open class does. */
  .nav-group:hover .nav-menu,
  .nav-group:focus-within .nav-menu { display: none; }
  .nav-group.is-open .nav-menu { display: block; }
}

/* ---- Landing page -------------------------------------------------------- */

.hero {
  background: linear-gradient(180deg, #fff 0%, var(--page) 100%);
  border-bottom: 1px solid var(--line);
  padding: 52px 0 40px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.9rem);
  line-height: 1.15;
  margin: 0 0 14px;
  color: var(--maroon-dark);
  letter-spacing: -.01em;
}
.hero .lede {
  max-width: 62ch;
  font-size: 1.09rem;
  color: var(--ink-2);
  margin: 0 0 10px;
}
.hero .lede strong { color: var(--ink); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--maroon);
  margin: 0 0 12px;
  font-weight: 600;
}

.filter-bar {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.filter-input {
  flex: 1 1 320px;
  max-width: 460px;
  font: inherit;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.filter-input:focus { border-color: var(--maroon); outline: none; box-shadow: 0 0 0 3px var(--maroon-tint); }
.filter-count { font-size: .88rem; color: var(--ink-3); font-family: var(--font-mono); }

.tier-section { padding: 40px 0 8px; }
.tier-head { margin-bottom: 20px; }
.tier-head h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0 0 4px;
  color: var(--ink);
}
.tier-head p { margin: 0; color: var(--ink-3); font-size: .95rem; max-width: 70ch; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(292px, 1fr));
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  height: 100%;
  padding: 18px 18px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform .12s, box-shadow .12s, border-color .12s;
}
.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--maroon-line);
  box-shadow: var(--shadow-lg);
  color: inherit;
}
.tool-card h3 {
  font-family: var(--font-display);
  font-size: 1.14rem;
  line-height: 1.25;
  margin: 0;
  color: var(--maroon-dark);
}
.tool-card p { margin: 0; font-size: .92rem; color: var(--ink-2); line-height: 1.5; }
.tool-card .card-foot { margin-top: auto; padding-top: 6px; }

.badges { display: flex; flex-wrap: wrap; gap: 6px; }
.badge {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .02em;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--maroon-tint);
  color: var(--maroon-dark);
  border: 1px solid var(--maroon-line);
  white-space: nowrap;
}
.badge--tier { background: var(--line-2); color: var(--ink-2); border-color: var(--line); }

.empty-state {
  padding: 40px 0;
  color: var(--ink-3);
  font-size: .98rem;
}

/* ---- Footer -------------------------------------------------------------- */

.site-footer {
  flex-shrink: 0;
  margin-top: 56px;
  padding: 30px 0 34px;
  background: #fff;
  border-top: 3px solid var(--maroon);
  font-size: .9rem;
  color: var(--ink-2);
}

.footer-related { margin-bottom: 22px; }
.footer-related h2 {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 8px;
}
.footer-related ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.integrity {
  max-width: 78ch;
  margin: 0 0 16px;
  padding: 14px 16px;
  background: var(--maroon-tint);
  border-left: 3px solid var(--maroon);
  border-radius: 0 var(--radius) var(--radius) 0;
  line-height: 1.55;
}
.integrity strong { color: var(--maroon-dark); }

.colophon {
  margin: 0;
  font-size: .84rem;
  color: var(--ink-3);
  font-family: var(--font-mono);
}

/* ---- Buttons (shared with tool pages) ------------------------------------ */

.btn {
  font: inherit;
  font-weight: 600;
  font-size: .93rem;
  padding: 9px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--maroon);
  background: var(--maroon);
  color: #fff;
  cursor: pointer;
  transition: background .12s, border-color .12s, color .12s;
}
.btn:hover:not(:disabled) { background: var(--maroon-dark); border-color: var(--maroon-dark); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.btn-ghost {
  background: var(--surface);
  color: var(--maroon-dark);
  border-color: var(--line);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--maroon-tint);
  border-color: var(--maroon-line);
  color: var(--maroon-dark);
}

@media print {
  .site-header, .site-footer, .stepper, .tool-form { display: none !important; }
}