/* Grade-It — 2026 chrome (header + footer), no framework */

:root {
  --gi-ink: #0b1020;
  --gi-ink-soft: #2b3144;
  --gi-muted: #5a6478;
  --gi-line: #81858c;
  --gi-line-strong: #4c4e51;
  --gi-bg: #f7f8fb;
  --gi-card: #ffffff;
  --gi-accent: #4f46e5;
  --gi-accent-2: #06b6d4;
  --gi-accent-soft: #eef0ff;
  --gi-shadow-sm: 0 1px 2px rgba(11, 16, 32, 0.05);
  --gi-shadow: 0 10px 30px -12px rgba(11, 16, 32, 0.15);
  --gi-font: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

html, body {
  background: var(--gi-bg);
  color: var(--gi-ink);
  font-family: var(--gi-font);
}

/* ---------- Top nav ---------- */
.gi-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: block;
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--gi-line);
  font-family: var(--gi-font);
  color: var(--gi-ink);
}

.gi-nav__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 24px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}

.gi-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: 17px;
  color: var(--gi-ink);
  text-decoration: none;
}

.gi-nav__brand:hover {
  color: var(--gi-accent);
}

.gi-nav__brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

.gi-nav__brand .gi-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gi-accent), var(--gi-accent-2));
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.gi-nav__links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
}

.gi-nav__links a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gi-ink-soft);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.gi-nav__links a:hover {
  background: var(--gi-accent-soft);
  color: var(--gi-accent);
}

.gi-nav__links a.is-active {
  background: var(--gi-ink);
  color: #fff;
}

.gi-nav__right {
  display: flex;
  align-items: center;
  gap: 10px;
}

a.gi-nav__login,
a.gi-nav__login:link,
a.gi-nav__login:visited {
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--gi-ink);
  color: #fff !important;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease;
}

a.gi-nav__login:hover,
a.gi-nav__login:focus {
  background: #14193a;
  color: #fff !important;
  transform: translateY(-1px);
}

/* User pill + dropdown */
.gi-user {
  position: relative;
}

.gi-user__btn {
  appearance: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 38px;
  padding: 0 14px 0 6px;
  background: #fff;
  border: 1px solid var(--gi-line);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gi-ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.gi-user__btn:hover {
  border-color: var(--gi-line-strong);
  box-shadow: var(--gi-shadow-sm);
}

.gi-user__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gi-accent), var(--gi-accent-2));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.gi-user__caret {
  font-size: 10px;
  color: var(--gi-muted);
}

.gi-user__menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--gi-line);
  border-radius: 14px;
  box-shadow: var(--gi-shadow);
  padding: 6px;
  display: none;
}

.gi-user.is-open .gi-user__menu {
  display: block;
}

.gi-user__menu a,
.gi-user__menu button {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 9px 12px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--gi-ink);
  text-decoration: none;
  cursor: pointer;
}

.gi-user__menu a:hover,
.gi-user__menu button:hover {
  background: var(--gi-accent-soft);
  color: var(--gi-accent);
}

.gi-user__menu hr {
  border: 0;
  border-top: 1px solid var(--gi-line);
  margin: 6px 0;
}

/* Mobile toggle */
.gi-nav__burger {
  display: none;
  appearance: none;
  background: #fff;
  border: 1px solid var(--gi-line);
  border-radius: 10px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--gi-ink);
}

.gi-nav__burger:hover {
  border-color: var(--gi-line-strong);
}

/* ---------- Problem page header variant ---------- */
#fixed-header.gi-nav.gi-nav--problem {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 100;
}

#fixed-header.gi-nav .gi-nav__inner--problem {
  max-width: none;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

#fixed-header.gi-nav #fixed-header-left,
#fixed-header.gi-nav #fixed-header-right {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  gap: 8px;
}

#fixed-header.gi-nav #fixed-header-left {
  flex: 1 1 auto;
  min-width: 0;
  overflow: visible;
  flex-wrap: wrap;
}

#fixed-header.gi-nav #fixed-header-right {
  flex: 0 0 auto;
  flex-shrink: 0;
  overflow: visible;
  position: relative;
}

#fixed-header.gi-nav .gi-nav__brand--problem {
  padding-right: 2px;
}

#fixed-header.gi-nav .gi-nav__brand--problem img {
  height: 32px;
  width: auto;
  border-radius: 0;
}

#fixed-header.gi-nav .gi-problem-meta {
  color: var(--gi-ink);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: min(52vw, 760px);
}

#fixed-header.gi-nav button,
#solution button.gi-btn {
  appearance: none;
  border: 1px solid var(--gi-line);
  background: #fff;
  color: var(--gi-ink-soft);
  cursor: pointer;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  height: 32px;
  padding: 0 12px;
  margin: 0;
  box-shadow: none;
  text-shadow: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

#fixed-header.gi-nav button:hover,
#solution button.gi-btn:hover {
  border-color: var(--gi-line-strong);
  color: var(--gi-ink);
  background: #fff;
  transform: translateY(-1px);
}

#fixed-header.gi-nav button:disabled,
#solution button.gi-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#fixed-header.gi-nav .submit-button,
#solution button.submit-button {
  background: var(--gi-ink);
  border-color: var(--gi-ink);
  color: #fff;
  box-shadow: var(--gi-shadow);
}

#fixed-header.gi-nav .submit-button:hover,
#solution button.submit-button:hover {
  background: #14193a;
  border-color: #14193a;
  color: #fff;
  transform: translateY(-1px);
}

/* Keyboard focus: the dark button swallows a plain blue focus ring, so
   separate it from the button with a white gap and use a bright outer ring. */
#fixed-header.gi-nav .submit-button:focus-visible,
#solution button.submit-button:focus-visible {
  outline: 3px solid var(--gi-accent-2);
  outline-offset: 3px;
  box-shadow: 0 0 0 2px #fff, var(--gi-shadow);
}

#fixed-header.gi-nav .gi-btn--ghost:hover {
  border-color: var(--gi-ink);
  color: var(--gi-ink);
}

#solution button.gi-btn--ghost:hover {
  border-color: var(--gi-ink);
  color: var(--gi-ink);
}

#fixed-header.gi-nav .undo-redo-container {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 4px 0 0;
}

#fixed-header.gi-nav .undo-redo-container button {
  width: 32px;
  padding: 0;
  justify-content: center;
}

#fixed-header.gi-nav #font-control-sizer {
  right: 0;
}

/* ---------- Footer ---------- */
.gi-foot {
  margin-top: 56px;
  background: #fff;
  border-top: 1px solid var(--gi-line);
  font-family: var(--gi-font);
  color: var(--gi-muted);
}

.gi-foot__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
}

.gi-foot__brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gi-foot__brand strong {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 800;
  color: var(--gi-ink);
  letter-spacing: -0.01em;
}

.gi-foot__brand p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  max-width: 32ch;
}

.gi-foot__col h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gi-ink);
  margin: 0 0 12px;
}

.gi-foot__col a {
  display: block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--gi-muted);
  text-decoration: none;
}

.gi-foot__col a:hover {
  color: var(--gi-accent);
}

.gi-foot__bar {
  border-top: 1px solid var(--gi-line);
  padding: 16px 24px;
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--gi-muted);
  gap: 16px;
  flex-wrap: wrap;
}

.gi-foot__legal a {
  color: var(--gi-muted);
  text-decoration: none;
  margin-left: 18px;
}

.gi-foot__legal a:hover {
  color: var(--gi-ink);
}

/* ---------- Body content tweak ---------- */
.body-content {
  padding: 0;
}

.gi-messages {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.gi-messages .alert {
  margin-top: 16px;
  border-radius: 12px;
  border: 1px solid var(--gi-line);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .gi-nav__inner {
    grid-template-columns: auto auto;
  }
  .gi-nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border-bottom: 1px solid var(--gi-line);
    padding: 10px 16px 16px;
    gap: 4px;
  }
  .gi-nav.is-open .gi-nav__links {
    display: flex;
  }
  .gi-nav__links a {
    height: 40px;
    padding: 0 12px;
    border-radius: 10px;
    justify-content: flex-start;
  }
  .gi-nav__burger {
    display: inline-flex;
  }
  .gi-foot__inner {
    grid-template-columns: 1fr 1fr;
  }

  #fixed-header.gi-nav .gi-nav__inner--problem {
    align-items: flex-start;
  }

  #fixed-header.gi-nav #fixed-header-right {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  #fixed-header.gi-nav .gi-problem-meta {
    max-width: 44vw;
  }
}

@media (max-width: 520px) {
  .gi-foot__inner {
    grid-template-columns: 1fr;
  }
  .gi-nav__login span.gi-hide-sm,
  .gi-user__btn span.gi-hide-sm {
    display: none;
  }

  #fixed-header.gi-nav .gi-nav__inner--problem {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  #fixed-header.gi-nav #fixed-header-right {
    justify-content: flex-start;
  }

  #fixed-header.gi-nav .gi-problem-meta {
    max-width: 100%;
  }
}