/* mcq — Nord dark theme, mobile-first reading UI */

/* ===========================
   Colour tokens (Nord palette)
   =========================== */
:root {
  --n0: #2E3440;
  --n1: #3B4252;
  --n2: #434C5E;
  --n3: #4C566A;
  --s0: #D8DEE9;
  --s1: #E5E9F0;
  --s2: #ECEFF4;
  --f0: #8FBCBB;
  --f1: #88C0D0;
  --f2: #81A1C1;
  --f3: #5E81AC;
  --red:    #BF616A;
  --green:  #A3BE8C;
  --yellow: #EBCB8B;
}

/* ===========================
   Reset
   =========================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; }

/* ===========================
   Base
   =========================== */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--n0);
  color: var(--s0);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--f1); text-decoration: none; }
a:hover { color: var(--f0); text-decoration: underline; }
p { margin-bottom: 0.875rem; }
h2 { font-size: 1.375rem; font-weight: 600; color: var(--s2); margin-bottom: 0.25rem; }
code {
  font-family: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
  font-size: 0.8125rem;
  color: var(--f0);
  background: var(--n2);
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
}

/* ===========================
   Top navigation
   =========================== */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  height: 48px;
  background: var(--n1);
  border-bottom: 1px solid var(--n3);
  position: sticky;
  top: 0;
  z-index: 100;
}
.topnav-brand {
  font-size: 1rem;
  font-weight: 700;
  color: var(--s2);
  text-decoration: none;
  letter-spacing: 0.04em;
}
.topnav-brand:hover { color: var(--f1); text-decoration: none; }
.topnav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.topnav-user {
  font-size: 0.8125rem;
  color: var(--s1);
}

/* ===========================
   Page containers
   =========================== */
.page-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}
.auth-container {
  max-width: 420px;
  margin: 5rem auto 2rem;
  padding: 0 1rem;
}

/* ===========================
   Auth pages
   =========================== */
.auth-header {
  text-align: center;
  margin-bottom: 1.75rem;
}
.auth-header .brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--s2);
  letter-spacing: 0.04em;
}
.auth-header .tagline {
  font-size: 0.6875rem;
  color: var(--f2);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-top: 0.25rem;
}

/* ===========================
   Cards
   =========================== */
.card {
  background: var(--n1);
  border: 1px solid var(--n3);
  border-radius: 6px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.card:last-child { margin-bottom: 0; }

/* ===========================
   Alerts
   =========================== */
.error {
  background: rgba(191, 97, 106, 0.12);
  color: #e07c82;
  border: 1px solid rgba(191, 97, 106, 0.3);
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

/* ===========================
   Buttons
   =========================== */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border: 1px solid var(--f3);
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
  line-height: 1.4;
  background: var(--f3);
  color: var(--s2);
}
button:hover, .btn:hover {
  background: var(--f2);
  border-color: var(--f2);
  text-decoration: none;
  color: var(--s2);
}
.btn-ghost {
  background: transparent;
  color: var(--s0);
  border-color: var(--n3);
}
.btn-ghost:hover {
  background: var(--n2);
  color: var(--s1);
  border-color: var(--n3);
  text-decoration: none;
}
.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
}

/* ===========================
   Forms
   =========================== */
.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--s0);
  margin-bottom: 0.375rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.form-group input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: var(--n0);
  border: 1px solid var(--n3);
  border-radius: 4px;
  color: var(--s1);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color 0.12s, box-shadow 0.12s;
  -webkit-appearance: none;
  appearance: none;
}
.form-group input:focus {
  outline: none;
  border-color: var(--f3);
  box-shadow: 0 0 0 3px rgba(94, 129, 172, 0.2);
}
.form-group input::placeholder { color: var(--n3); }
.form-actions { margin-top: 0.25rem; }

/* ===========================
   Document list
   =========================== */
.doc-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
}
.doc-item {
  display: block;
  background: var(--n1);
  border: 1px solid var(--n3);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  text-decoration: none;
  transition: border-color 0.12s, background 0.12s;
}
.doc-item:hover {
  border-color: var(--f3);
  background: var(--n2);
  text-decoration: none;
}
.doc-item.doc-read {
  opacity: 0.6;
}
.doc-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--s2);
  margin-bottom: 0.25rem;
}
.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--n3);
}
.doc-badge {
  display: inline-block;
  padding: 0.0625rem 0.375rem;
  border-radius: 3px;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.doc-badge.unread {
  background: rgba(94, 129, 172, 0.2);
  color: var(--f1);
  border: 1px solid rgba(94, 129, 172, 0.35);
}
.doc-badge.read {
  background: rgba(163, 190, 140, 0.15);
  color: var(--green);
  border: 1px solid rgba(163, 190, 140, 0.3);
}

/* ===========================
   Read view
   =========================== */
.read-header {
  margin-bottom: 1.25rem;
}
.read-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--n3);
  margin-top: 0.25rem;
  margin-bottom: 0.75rem;
}
.read-actions {
  display: flex;
  gap: 0.5rem;
}

/* ===========================
   Markdown body
   =========================== */
.markdown-body {
  font-size: 0.9375rem;
  line-height: 1.7;
}
.markdown-body h1 { font-size: 1.5rem; font-weight: 700; color: var(--s2); margin: 1.5rem 0 0.75rem; }
.markdown-body h2 { font-size: 1.25rem; font-weight: 600; color: var(--s2); margin: 1.25rem 0 0.5rem; }
.markdown-body h3 { font-size: 1.0625rem; font-weight: 600; color: var(--s1); margin: 1rem 0 0.5rem; }
.markdown-body h4 { font-size: 0.9375rem; font-weight: 600; color: var(--s1); margin: 0.75rem 0 0.375rem; }
.markdown-body p { margin-bottom: 0.75rem; }
.markdown-body ul, .markdown-body ol {
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
}
.markdown-body li { margin-bottom: 0.25rem; }
.markdown-body pre {
  background: var(--n0);
  border: 1px solid var(--n3);
  border-radius: 4px;
  padding: 0.875rem 1rem;
  overflow-x: auto;
  margin-bottom: 0.75rem;
  font-size: 0.8125rem;
  line-height: 1.5;
}
.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: var(--s0);
}
.markdown-body blockquote {
  border-left: 3px solid var(--f3);
  padding-left: 1rem;
  color: var(--s0);
  margin-bottom: 0.75rem;
}
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
}
.markdown-body th, .markdown-body td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--n3);
  text-align: left;
}
.markdown-body th {
  background: var(--n2);
  font-weight: 600;
  color: var(--s2);
}
.markdown-body hr {
  border: none;
  border-top: 1px solid var(--n3);
  margin: 1.25rem 0;
}
.markdown-body a { color: var(--f1); }
.markdown-body a:hover { color: var(--f0); }
.markdown-body img {
  max-width: 100%;
  height: auto;
}
.markdown-body strong { color: var(--s2); }