/* =========================================================================
   carpe linguam — shared stylesheet
   One file, loaded by every page via <link rel="stylesheet" href="/assets/css/styles.css">.
   Organized in sections: tokens, reset, type, layout, components, pages,
   responsive, accessibility. Component sections are ordered to roughly
   match how a visitor moves through the site (nav → hero → the rest).
   ========================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,wght@0,500;0,600;0,700;1,500;1,600&family=Work+Sans:wght@400;500;600;700&display=swap');

/* ---- Tokens ------------------------------------------------------------ */

:root {
  /* Color. The accent is Tyrian purple — the dye of Roman magistrates'
     robes — paired with a warm parchment paper tone rather than stark
     white, plus a muted antique bronze for a second, sparing accent. */
  --ink:          #241726;
  --ink-soft:     #6E5F6C;
  --paper:        #FBF8F9;
  --surface:      #FFFFFF;
  --line:         #E6DCE3;

  --tyrian:       #6E2555;
  --tyrian-deep:  #55173F;
  --tyrian-wash:  #F3E7EE;

  --surface-ink:  #2A1130;
  --cream:        #F4EAE0;
  --cream-soft:   rgba(244, 234, 224, 0.72);

  --bronze:       #8C5F22;
  --bronze-wash:  #F3E7CC;

  --good:         #3F7D5A;
  --good-wash:    #E7F2EB;
  --bad:          #A83B3B;
  --bad-wash:     #F7E9E7;

  /* Type */
  --font-display: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-body: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-md:   1.125rem;
  --fs-lg:   1.375rem;
  --fs-xl:   1.875rem;
  --fs-2xl:  2.5rem;
  --fs-3xl:  clamp(2.75rem, 6vw, 4.25rem);

  /* Space */
  --sp-1: 0.5rem;
  --sp-2: 0.75rem;
  --sp-3: 1rem;
  --sp-4: 1.5rem;
  --sp-5: 2.5rem;
  --sp-6: 4rem;

  --radius-sm: 4px;
  --radius-md: 10px;
  --shadow-modal: 0 20px 60px rgba(36, 23, 38, 0.28);
}

/* ---- Reset & base -------------------------------------------------------*/

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

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
svg { display: block; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--sp-2);
  color: var(--ink);
}
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-md); }

p { margin: 0 0 var(--sp-3); }
p:last-child { margin-bottom: 0; }

a { color: var(--tyrian); }
a:hover { color: var(--tyrian-deep); }

ul, ol { margin: 0; padding-left: 1.25em; }

::selection { background: var(--tyrian); color: var(--cream); }

button { font-family: inherit; }

/* Keyboard focus is always visible, everywhere, regardless of what else a
   component does with hover/active states. */
:focus-visible {
  outline: 2px solid var(--tyrian);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---- Layout utilities ---------------------------------------------------*/

.wrap { max-width: 68rem; margin: 0 auto; padding: 0 var(--sp-4); }
.section { padding: var(--sp-6) 0; }
.section-narrow { padding: var(--sp-5) 0 var(--sp-6); }

main { min-height: 60vh; }

/* ---- Buttons -------------------------------------------------------------*/

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.65em 1.35em;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.05s ease;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--tyrian);
  border-color: var(--tyrian);
  color: var(--cream);
}
.btn-primary:hover:not(:disabled) { background: var(--tyrian-deep); border-color: var(--tyrian-deep); color: #fff; }

.btn-secondary {
  background: transparent;
  border-color: var(--tyrian);
  color: var(--tyrian-deep);
}
.btn-secondary:hover:not(:disabled) { background: var(--tyrian-wash); }

.btn-danger {
  background: var(--bad-wash);
  border-color: var(--bad-wash);
  color: var(--bad);
}
.btn-danger:hover:not(:disabled) { background: var(--bad); border-color: var(--bad); color: #fff; }

.btn-know {
  background: var(--good-wash);
  border-color: var(--good-wash);
  color: var(--good);
}
.btn-know:hover:not(:disabled) { background: var(--good); border-color: var(--good); color: #fff; }

.btn-ghost-on-ink {
  background: transparent;
  border-color: var(--cream-soft);
  color: var(--cream);
}
.btn-ghost-on-ink:hover:not(:disabled) { background: rgba(244, 234, 224, 0.12); border-color: var(--cream); }

.btn-small { padding: 0.42em 0.9em; font-size: var(--fs-sm); }

/* ---- Forms & fields ------------------------------------------------------*/

.field { margin-bottom: var(--sp-3); }
.field label {
  display: block;
  font-weight: 600;
  font-size: var(--fs-sm);
  margin-bottom: 0.4em;
  color: var(--ink);
}

input[type="text"],
input[type="password"],
textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  padding: 0.65em 0.8em;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 0.15s ease;
}
input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
  border-color: var(--tyrian);
  outline: none;
}

textarea { resize: vertical; min-height: 6em; font-family: inherit; }

.field-error {
  color: var(--bad);
  font-size: var(--fs-sm);
  margin: -0.35em 0 var(--sp-3);
}
.field-hint {
  color: var(--ink-soft);
  font-size: var(--fs-sm);
}
.section-lead { color: var(--ink-soft); }

.placeholder-note {
  background: var(--tyrian-wash);
  color: var(--tyrian-deep);
  border-radius: var(--radius-sm);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
}
.empty-note { color: var(--ink-soft); font-style: italic; }

/* ---- Nav -------------------------------------------------------------- */

.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-2) var(--sp-4);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: relative;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.55em;
  text-decoration: none;
  color: var(--ink);
  margin-right: auto;
}
.nav-brand img { height: 26px; width: auto; }
.nav-brand span {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-lg);
  color: var(--ink);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: var(--fs-sm);
  padding: 0.3em 0.1em;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.is-active { color: var(--tyrian); border-bottom-color: var(--tyrian); }

.nav-id { font-size: var(--fs-sm); margin-left: auto; }
.nav-id-name { display: inline-flex; align-items: center; gap: 0.6em; color: var(--ink-soft); }
.nav-id-name strong { color: var(--ink); font-weight: 600; }
.nav-id-name button,
.footer-inner button {
  background: none;
  border: none;
  color: var(--tyrian);
  font-weight: 600;
  font-size: inherit;
  font-family: inherit;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.nav-id-name button:hover,
.footer-inner button:hover { color: var(--tyrian-deep); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--ink);
  cursor: pointer;
  padding: 0.25em;
}

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

#lv-footer { border-top: 1px solid var(--line); margin-top: var(--sp-6); }
.footer-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
  align-items: center;
  justify-content: space-between;
  color: var(--ink-soft);
  font-size: var(--fs-sm);
}

/* ---- Identify / moderator modal ----------------------------------------*/

.lv-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(36, 23, 38, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-3);
  z-index: 100;
}
.lv-modal {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  max-width: 26rem;
  width: 100%;
  box-shadow: var(--shadow-modal);
}
.lv-modal h2 { font-size: var(--fs-lg); }
.lv-modal form { margin-top: var(--sp-3); }

/* ---- Hero (home page) ---------------------------------------------------*/

.hero {
  position: relative;
  overflow: hidden;
  background: var(--surface-ink);
  color: var(--cream);
  text-align: center;
  padding: var(--sp-6) var(--sp-4);
}
.hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -8%;
  width: 420px;
  height: 420px;
  background-image: url("/assets/img/logo.svg");
  background-repeat: no-repeat;
  background-size: 420px auto;
  filter: brightness(0) invert(1);
  opacity: 0.08;
  pointer-events: none;
}
.hero-inner { position: relative; max-width: 40rem; margin: 0 auto; }
.hero-mark {
  height: 84px;
  width: auto;
  margin: 0 auto var(--sp-3);
  filter: brightness(0) invert(1);
  opacity: 0.92;
}
.hero h1 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-3xl);
  color: var(--cream);
  margin-bottom: var(--sp-2);
}
.hero-tagline {
  font-variant: small-caps;
  letter-spacing: 0.06em;
  font-size: var(--fs-md);
  color: var(--cream-soft);
  margin-bottom: var(--sp-4);
}
.hero-actions {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Feature row (home page) --------------------------------------------*/

.feature-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
}
.feature h3 { margin-bottom: 0.35em; }
.feature p { color: var(--ink-soft); font-size: var(--fs-sm); margin: 0; }

/* ---- Login banner (home page) --------------------------------------------*/

.login-banner {
  background: var(--tyrian-wash);
  border-bottom: 1px solid var(--line);
}
.login-banner .wrap {
  padding-top: var(--sp-3);
  padding-bottom: var(--sp-3);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-4);
}
.login-banner p { margin: 0; color: var(--tyrian-deep); font-weight: 500; }
.login-banner-actions { display: flex; gap: var(--sp-2); flex-wrap: wrap; }

/* ---- Page header (every interior page) -----------------------------------*/

.page-header {
  background: var(--surface-ink);
  color: var(--cream);
  padding: var(--sp-5) var(--sp-4);
}
.page-header-inner { max-width: 68rem; margin: 0 auto; }
.page-header h1 { color: var(--cream); margin-bottom: 0.3em; }
.page-header p { color: var(--cream-soft); margin: 0; max-width: 42rem; }

/* ---- Resources page -------------------------------------------------------*/

.empty-state { text-align: center; padding: var(--sp-6) var(--sp-3); color: var(--ink-soft); }
.empty-mark {
  width: 52px;
  height: 52px;
  margin: 0 auto var(--sp-3);
  border: 2px solid var(--tyrian);
  border-radius: 50%;
  opacity: 0.45;
}
.empty-state h2 { color: var(--ink); }

.resource-group { margin-bottom: var(--sp-5); }
.resource-group h2 { margin-bottom: var(--sp-3); }
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: var(--sp-3);
}
.resource-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.resource-card:hover { border-color: var(--tyrian); transform: translateY(-2px); }
.resource-type {
  display: inline-block;
  font-size: var(--fs-sm);
  color: var(--tyrian-deep);
  background: var(--tyrian-wash);
  border-radius: var(--radius-sm);
  padding: 0.2em 0.6em;
  margin-bottom: var(--sp-2);
}
.resource-card h3 { margin-bottom: 0.3em; }
.resource-card p { color: var(--ink-soft); font-size: var(--fs-sm); margin: 0; }

/* ---- Forum ---------------------------------------------------------------*/

.forum-compose {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
  margin-bottom: var(--sp-4);
}
.forum-compose label { display: block; font-weight: 600; margin-bottom: 0.5em; }
.forum-compose textarea { margin-bottom: var(--sp-2); }
.visibility-choice {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  font-size: var(--fs-sm);
  color: var(--ink-soft);
  margin-bottom: var(--sp-3);
}
.visibility-choice label { display: flex; align-items: center; gap: 0.4em; font-weight: 400; }

.forum-post {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
  margin-bottom: var(--sp-3);
}
.forum-post-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6em;
  margin-bottom: var(--sp-2);
  font-size: var(--fs-sm);
}
.forum-post-author { font-weight: 600; color: var(--ink); }
.forum-post-time { color: var(--ink-soft); margin-left: auto; }
.forum-post-body { margin-bottom: var(--sp-2); }

.visibility-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15em 0.55em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--tyrian);
  color: var(--tyrian-deep);
}
.visibility-badge.pinned-badge {
  border-color: var(--bronze);
  color: var(--bronze);
  background: var(--bronze-wash);
}

.forum-reply {
  border-top: 1px solid var(--line);
  padding-top: var(--sp-2);
  margin-top: var(--sp-2);
  font-size: var(--fs-sm);
}
.forum-reply-head { font-weight: 600; color: var(--ink); margin-bottom: 0.2em; }

.forum-post-actions {
  display: flex;
  gap: 0.5em;
  flex-wrap: wrap;
  margin-top: var(--sp-3);
}
.forum-reply-form {
  display: flex;
  gap: 0.5em;
  margin-top: var(--sp-2);
}
.forum-reply-form input { flex: 1; }

/* ---- Tools / dashboard -----------------------------------------------------*/

.tool-section { border-bottom: 1px solid var(--line); }
.tool-section-inner { max-width: 68rem; margin: 0 auto; padding: var(--sp-5) var(--sp-4); }
.tool-section-desc { color: var(--ink-soft); max-width: 40rem; }

.gate { max-width: 22rem; margin-top: var(--sp-3); }

.add-student-form {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-end;
  flex-wrap: wrap;
  margin-top: var(--sp-3);
}
.add-student-form .field { margin-bottom: 0; min-width: 12rem; }

.dash-table { width: 100%; border-collapse: collapse; margin-top: var(--sp-3); }
.dash-table th, .dash-table td {
  text-align: left;
  padding: var(--sp-2);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-size: var(--fs-sm);
}
.dash-table th { color: var(--ink-soft); font-weight: 600; }
.dash-events { list-style: none; padding: 0; margin: 0; }
.dash-events li { margin-bottom: 0.3em; }

.score-pill {
  display: inline-block;
  background: var(--tyrian-wash);
  color: var(--tyrian-deep);
  font-weight: 600;
  font-size: 0.75rem;
  padding: 0.1em 0.5em;
  border-radius: var(--radius-sm);
}
.banned-tag {
  display: inline-block;
  background: var(--bad-wash);
  color: var(--bad);
  font-weight: 600;
  font-size: 0.7rem;
  padding: 0.1em 0.45em;
  border-radius: var(--radius-sm);
  margin-left: 0.4em;
}

/* ---- Flashcards -----------------------------------------------------------*/

.fc-card {
  perspective: 1400px;
  cursor: pointer;
  margin-bottom: var(--sp-4);
}
.fc-card-inner {
  position: relative;
  min-height: 14rem;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.3, 1);
  transform-style: preserve-3d;
}
.fc-card.is-flipped .fc-card-inner { transform: rotateY(180deg); }
.fc-card-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--sp-4);
  border-radius: var(--radius-md);
  backface-visibility: hidden;
  font-family: var(--font-display);
  font-size: var(--fs-xl);
}
.fc-card-front {
  background: var(--surface);
  border: 1.5px solid var(--line);
  color: var(--ink);
}
.fc-card-back {
  background: var(--tyrian);
  color: var(--cream);
  transform: rotateY(180deg);
}
.fc-sort-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
}
.fc-sort-nav .btn { flex: 1; justify-content: center; }

.fc-summary-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
  margin-bottom: var(--sp-4);
}
.fc-summary-col {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
}
.fc-summary-col ul { list-style: none; padding: 0; margin: 0; font-size: var(--fs-sm); }
.fc-summary-col li { padding: 0.25em 0; border-bottom: 1px solid var(--line); }
.fc-summary-col li:last-child { border-bottom: none; }
.fc-summary-actions { display: flex; gap: var(--sp-2); flex-wrap: wrap; }

/* ---- Grammar quiz ----------------------------------------------------------*/

.quiz-question h3 { margin: 0.3em 0 var(--sp-3); }
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.quiz-option {
  text-align: left;
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.75em 1em;
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.quiz-option:hover:not(:disabled) { border-color: var(--tyrian); }
.quiz-option:disabled { cursor: default; }
.quiz-option.is-correct { background: var(--good-wash); border-color: var(--good); color: var(--good); font-weight: 600; }
.quiz-option.is-wrong { background: var(--bad-wash); border-color: var(--bad); color: var(--bad); }
.quiz-score { text-align: center; padding: var(--sp-4) 0; }
.quiz-score h2 { font-size: var(--fs-3xl); color: var(--tyrian); }

/* ---- Passage ---------------------------------------------------------------*/

.passage-text {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  line-height: 1.8;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  margin-bottom: var(--sp-3);
  white-space: pre-line;
}
.reveal {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--sp-2) var(--sp-3);
  margin-top: var(--sp-3);
  background: var(--surface);
}
.reveal summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--tyrian-deep);
  list-style: none;
}
.reveal summary::-webkit-details-marker { display: none; }
.reveal summary::before { content: "+ "; }
.reveal[open] summary::before { content: "\2212 "; }
.reveal[open] summary { margin-bottom: var(--sp-2); }
.reveal ul { padding-left: 1.1em; }
.reveal li { margin-bottom: 0.4em; }

/* ---- Responsive ------------------------------------------------------------*/

@media (max-width: 860px) {
  .feature-row { grid-template-columns: repeat(2, 1fr); }
  .fc-summary-cols { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links, .nav-id { display: none; width: 100%; }
  .nav {
    flex-wrap: wrap;
  }
  .nav.is-open .nav-links,
  .nav.is-open .nav-id {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin: 0;
  }
  .nav.is-open .nav-id { margin-top: var(--sp-2); padding-top: var(--sp-2); border-top: 1px solid var(--line); }

  .feature-row { grid-template-columns: 1fr; }
  .add-student-form { flex-direction: column; align-items: stretch; }
  .dash-table { display: block; overflow-x: auto; }
}

@media (max-width: 520px) {
  .hero { padding: var(--sp-5) var(--sp-3); }
  .forum-post-time { margin-left: 0; }
}