.footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.75rem;
  color: var(--text3);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}
.footer-sep { margin: 0 0.5rem; }
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0f0f13;
  --surface: #18181f;
  --surface2: #22222c;
  --border: #2e2e3a;
  --text: #e8e8f0;
  --text2: #9090a8;
  --text3: #5a5a70;
  --accent: #7c6af7;
  --accent2: #a598ff;
  --accent-bg: rgba(124,106,247,0.12);
  --green: #3ecf8e;
  --green-bg: rgba(62,207,142,0.12);
  --red: #f75a5a;
  --red-bg: rgba(247,90,90,0.12);
  --yellow: #f7c05a;
  --yellow-bg: rgba(247,192,90,0.12);
  --radius: 10px;
  --radius-lg: 16px;
  --font: 'DM Sans', sans-serif;
  --font-serif: 'DM Serif Display', serif;
  --font-mono: 'DM Mono', monospace;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}
html { font-size: 15px; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; }
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Navbar ── */
.navbar {
  display: flex; align-items: center; gap: 1.5rem;
  padding: 0 2rem; height: 56px;
  background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.nav-brand { font-family: var(--font-serif); font-size: 1.25rem; color: var(--text); font-style: italic; }
.nav-links { display: flex; gap: 0.25rem; flex: 1; }
.nav-link { padding: 5px 12px; border-radius: 6px; font-size: 0.875rem; color: var(--text2); transition: all 0.15s; }
.nav-link:hover, .nav-link.active { color: var(--text); background: var(--surface2); text-decoration: none; }
.nav-user { margin-left: auto; display: flex; align-items: center; gap: 1rem; font-size: 0.875rem; }
.nav-username { color: var(--text2); }
.nav-logout { color: var(--text3); font-size: 0.8rem; }
.nav-logout:hover { color: var(--red); }

/* ── Flash messages ── */
.flash-container { padding: 0.75rem 2rem 0; }
.flash { padding: 10px 16px; border-radius: var(--radius); font-size: 0.875rem; margin-bottom: 0.5rem; }
.flash-error { background: var(--red-bg); color: var(--red); border: 1px solid rgba(247,90,90,0.3); }
.flash-success { background: var(--green-bg); color: var(--green); border: 1px solid rgba(62,207,142,0.3); }

/* ── Page layout ── */
main { max-width: 900px; margin: 0 auto; padding: 2rem 1.5rem; }
.page-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 2rem; gap: 1rem; flex-wrap: wrap; }
.page-title { font-family: var(--font-serif); font-size: 2rem; font-style: italic; color: var(--text); }
.page-title em { color: var(--accent2); font-style: inherit; }
.page-sub { color: var(--text2); margin-top: 4px; font-size: 0.9rem; }
.section-title { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text3); margin-bottom: 1rem; }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 20px; border-radius: var(--radius); font-family: var(--font); font-size: 0.875rem; font-weight: 500; cursor: pointer; border: 1px solid transparent; transition: all 0.15s; text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: #9080ff; text-decoration: none; }
.btn-secondary { background: var(--surface2); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--border); text-decoration: none; }
.btn-full { width: 100%; justify-content: center; }

/* ── Auth ── */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 2rem; background: radial-gradient(ellipse at 50% 0%, rgba(124,106,247,0.12) 0%, transparent 70%); }
.auth-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2.5rem; width: 100%; max-width: 400px; box-shadow: var(--shadow); }
.auth-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 1.75rem; }
.auth-logo-icon { font-size: 1.5rem; color: var(--accent2); }
.auth-logo-text { font-family: var(--font-serif); font-size: 1.25rem; font-style: italic; }
.auth-title { font-family: var(--font-serif); font-size: 1.75rem; font-style: italic; margin-bottom: 6px; }
.auth-sub { color: var(--text2); font-size: 0.875rem; margin-bottom: 2rem; }
.auth-form { display: flex; flex-direction: column; gap: 1.25rem; }
.auth-switch { margin-top: 1.5rem; text-align: center; font-size: 0.875rem; color: var(--text2); }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 0.8rem; font-weight: 500; color: var(--text2); }
.form-hint { font-weight: 400; color: var(--text3); }
.form-input, .form-select { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 9px 12px; color: var(--text); font-family: var(--font); font-size: 0.875rem; transition: border-color 0.15s; }
.form-input:focus, .form-select:focus { outline: none; border-color: var(--accent); }
.form-select { cursor: pointer; }

/* ── Stats grid ── */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 2rem; }
@media (max-width: 640px) { .stats-grid { grid-template-columns: repeat(2,1fr); } }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; text-align: center; }
.stat-due { border-color: rgba(247,192,90,0.4); background: linear-gradient(135deg, var(--surface), rgba(247,192,90,0.06)); }
.stat-value { font-family: var(--font-serif); font-size: 2rem; color: var(--text); }
.stat-label { font-size: 0.775rem; color: var(--text3); margin-top: 4px; }

/* ── Lang grid ── */
.lang-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 0.75rem; margin-bottom: 2rem; }
.lang-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem 1rem; display: flex; flex-direction: column; align-items: center; gap: 6px; transition: all 0.2s; text-decoration: none; }
.lang-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.lang-flag { font-size: 2rem; }
.lang-name { font-size: 0.875rem; font-weight: 500; color: var(--text); }
.lang-count { font-size: 0.75rem; color: var(--text3); }
.lang-add { border-style: dashed; }
.lang-add .lang-flag { color: var(--text3); }

/* ── Quick grid ── */
.quick-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 0.75rem; }
@media(max-width:500px){ .quick-grid{grid-template-columns:1fr;} }
.quick-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); transition: all 0.2s; }
.quick-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.quick-icon { font-size: 1.5rem; }
.quick-label { font-size: 0.875rem; font-weight: 500; flex:1; }
.quick-badge { background: var(--yellow-bg); color: var(--yellow); font-size: 0.75rem; font-weight: 600; padding: 2px 8px; border-radius: 20px; }

/* ── Study page ── */
.study-controls { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; margin-bottom: 1.5rem; }
.filter-row { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; }
.filter-row .form-select { flex: 1; min-width: 140px; }
.study-empty { text-align: center; padding: 4rem 2rem; color: var(--text2); }
.empty-icon { font-size: 3rem; margin-bottom: 1rem; }

/* ── Flashcard ── */
.session-wrap { max-width: 560px; margin: 0 auto; }
.session-top { display: flex; align-items: center; gap: 12px; margin-bottom: 1.25rem; }
.session-counter { font-size: 0.8rem; color: var(--text3); white-space: nowrap; }
.session-progress-bar { flex:1; height: 4px; background: var(--surface2); border-radius: 2px; overflow: hidden; }
.session-progress-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.4s; }
.session-score { font-size: 0.8rem; color: var(--green); white-space: nowrap; }

.card-scene { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); min-height: 220px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.2s; padding: 2rem; margin-bottom: 1rem; position: relative; user-select: none; }
.card-scene:hover { border-color: var(--accent); }
.fc { width: 100%; text-align: center; }
.fc-tag { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text3); margin-bottom: 0.75rem; }
.fc-word { font-family: var(--font-serif); font-size: 2.25rem; font-style: italic; color: var(--text); margin-bottom: 6px; }
.fc-phonetic { font-family: var(--font-mono); font-size: 0.875rem; color: var(--text3); margin-bottom: 8px; }
.fc-example { font-size: 0.875rem; color: var(--text2); font-style: italic; margin-top: 8px; }
.fc-hint { font-size: 0.75rem; color: var(--text3); margin-top: 1rem; }

.rating-row { display: flex; gap: 8px; margin-bottom: 1rem; flex-wrap: wrap; }
.rating-btn { flex: 1; min-width: 70px; padding: 10px 6px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface2); color: var(--text); font-family: var(--font); font-size: 0.8rem; cursor: pointer; transition: all 0.15s; text-align: center; }
.r-bad:hover   { background: var(--red-bg); border-color: var(--red); color: var(--red); }
.r-hard:hover  { background: var(--yellow-bg); border-color: var(--yellow); color: var(--yellow); }
.r-ok:hover    { background: rgba(90,167,247,0.12); border-color: #5aa7f7; color: #5aa7f7; }
.r-good:hover  { background: var(--green-bg); border-color: var(--green); color: var(--green); }
.r-easy:hover  { background: var(--accent-bg); border-color: var(--accent2); color: var(--accent2); }

.sm2-info { font-size: 0.75rem; color: var(--text3); text-align: center; min-height: 1.2em; }

/* ── Session end ── */
.session-end { text-align: center; padding: 3rem 1rem; }
.end-emoji { font-size: 3.5rem; margin-bottom: 1rem; }
.session-end h2 { font-family: var(--font-serif); font-size: 1.75rem; font-style: italic; margin-bottom: 8px; }
.session-end p { color: var(--text2); margin-bottom: 2rem; font-size: 0.9rem; }
.end-stats { display: flex; justify-content: center; gap: 2.5rem; margin-bottom: 2rem; }
.end-stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.end-stat span { font-family: var(--font-serif); font-size: 2rem; }
.end-stat small { font-size: 0.75rem; color: var(--text3); }
.end-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ── Cards table ── */
.cards-table-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.cards-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.cards-table th { padding: 10px 16px; background: var(--surface2); color: var(--text3); font-weight: 500; text-align: left; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; border-bottom: 1px solid var(--border); }
.cards-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.cards-table tr:last-child td { border-bottom: none; }
.cards-table tr:hover td { background: var(--surface2); }
.td-main { font-weight: 500; }
.td-mono { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text3); }
.td-actions { display: flex; gap: 6px; }
.flag-badge { font-size: 1.2rem; }
.cat-badge { background: var(--surface2); border: 1px solid var(--border); border-radius: 20px; padding: 2px 10px; font-size: 0.75rem; color: var(--text2); }
.icon-btn { background: none; border: none; cursor: pointer; font-size: 1rem; padding: 4px; border-radius: 6px; transition: background 0.15s; }
.icon-btn:hover { background: var(--surface2); }
.icon-btn-del:hover { background: var(--red-bg); }

/* ── Modal ── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.65); display: flex; align-items: center; justify-content: center; z-index: 200; padding: 1rem; backdrop-filter: blur(4px); }
.modal-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2rem; width: 100%; max-width: 560px; box-shadow: var(--shadow); }
.modal-title { font-family: var(--font-serif); font-size: 1.5rem; font-style: italic; margin-bottom: 1.5rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1.5rem; }
@media(max-width:480px){ .form-grid{grid-template-columns:1fr;} }
.modal-actions { display: flex; gap: 0.75rem; justify-content: flex-end; }