/* ============================================================
   srs.css — SRS Review Session UI
   ============================================================ */

/* ── Tab bar ───────────────────────────────────────────── */
.srs-tabs-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  padding-bottom: 12px;
}
.srs-tab-btn {
  background: none;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 8px;
  color: var(--text2, #94a3b8);
  padding: 8px 18px;
  font-size: .85rem;
  cursor: pointer;
  transition: all .15s;
}
.srs-tab-btn:hover {
  border-color: rgba(96,165,250,.4);
  color: var(--text);
}
.srs-tab-btn--active {
  background: rgba(96,165,250,.15);
  border-color: #60a5fa;
  color: #60a5fa;
  font-weight: 600;
}

/* ── Hero card (home view) ─────────────────────────────── */
.srs-hero {
  background: linear-gradient(135deg, rgba(96,165,250,.08), rgba(167,139,250,.06));
  border: 1px solid rgba(96,165,250,.2);
  border-radius: 18px;
  padding: 24px 22px;
  text-align: center;
  margin-bottom: 18px;
}
.srs-hero-meta {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.srs-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: .78rem;
  color: var(--text2, #94a3b8);
}
.srs-pill-streak {
  background: rgba(251,146,60,.12);
  border-color: rgba(251,146,60,.3);
  color: #fb923c;
}
.srs-pill-brain {
  background: rgba(96,165,250,.12);
  border-color: rgba(96,165,250,.3);
  color: #60a5fa;
}
.srs-hero-body { margin: 12px 0 20px; }
.srs-hero-num {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, #60A5FA, #A78BFA);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.srs-hero-cap {
  margin-top: 6px;
  color: var(--text2, #94a3b8);
  font-size: .9rem;
}
.srs-hero-cta {
  min-width: 220px;
  font-size: 1rem !important;
  padding: 12px 28px !important;
}
.srs-len-row {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.srs-len-chip {
  background: none;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 999px;
  color: var(--text2, #94a3b8);
  padding: 5px 14px;
  font-size: .8rem;
  cursor: pointer;
  transition: all .15s;
}
.srs-len-chip:hover { color: var(--text); border-color: rgba(96,165,250,.4); }
.srs-len-chip--active {
  background: rgba(96,165,250,.18);
  border-color: #60a5fa;
  color: #60a5fa;
  font-weight: 600;
}
.srs-topic-preview {
  margin-top: 18px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: .8rem;
  color: var(--text2, #94a3b8);
}
.srs-topic-label { font-weight: 500; opacity: .85; }
.srs-topic-chip {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: .75rem;
}
.srs-topic-chip em {
  font-style: normal;
  color: #60a5fa;
  font-weight: 600;
  margin-left: 4px;
}
.srs-hero-rest { padding: 12px 0 4px; }
.srs-hero-rest-icon { font-size: 3rem; margin-bottom: 8px; }
.srs-hero-rest h3 { margin: 0 0 8px; }
.srs-hero-rest p {
  margin: 0;
  color: var(--text2, #94a3b8);
  font-size: .88rem;
  line-height: 1.55;
}

/* ── Library stat row ──────────────────────────────────── */
.srs-lib-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}
.srs-lib-stat {
  background: var(--surface, rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 12px;
  padding: 12px 8px;
  text-align: center;
}
.srs-lib-num {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}
.srs-lib-cap {
  font-size: .72rem;
  color: var(--text2, #94a3b8);
  margin-top: 2px;
}

/* ── Add cards card ────────────────────────────────────── */
.srs-add-card {
  background: var(--surface, rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 14px;
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
}
.srs-add-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.srs-add-info strong { font-size: .92rem; color: var(--text); }
.srs-add-info span { font-size: .78rem; color: var(--text2, #94a3b8); }
.srs-add-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.srs-level-picker {
  flex-basis: 100%;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

/* Manage row: Add + Reduce side by side */
.srs-manage-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}
.srs-manage-card { margin: 0; }
.srs-add-card--plus  { border-left: 3px solid #34d399; }
.srs-add-card--minus { border-left: 3px solid #fb923c; }
.srs-add-card button[disabled] { opacity: .45; cursor: not-allowed; }

@media (max-width: 720px) {
  .srs-manage-row { grid-template-columns: 1fr; }
}

/* Toast */
.srs-toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(15, 23, 42, .95);
  color: #e2e8f0;
  padding: 10px 18px;
  border-radius: 24px;
  font-size: .88rem;
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
  opacity: 0;
  transition: opacity .25s, transform .25s;
  z-index: 9999;
  pointer-events: none;
}
.srs-toast--show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Manage cards view ─────────────────────────────────── */
.srs-manage {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}
.srs-manage-head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.srs-manage-head h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}
.srs-manage-filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.srs-filter-chip {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  color: var(--text2, #94a3b8);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: .78rem;
  cursor: pointer;
  transition: all .15s;
}
.srs-filter-chip:hover { background: rgba(255,255,255,.07); }
.srs-filter-chip--active {
  background: rgba(96, 165, 250, .15);
  border-color: rgba(96, 165, 250, .5);
  color: #93c5fd;
}
.srs-manage-search {
  width: 100%;
  padding: 10px 14px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 10px;
  color: var(--text);
  font-size: .9rem;
}
.srs-manage-search:focus {
  outline: none;
  border-color: rgba(96, 165, 250, .5);
}
.srs-manage-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 4px;
}
.srs-manage-empty {
  padding: 32px;
  text-align: center;
  color: var(--text2, #94a3b8);
  font-size: .9rem;
}
.srs-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 10px;
  transition: background .15s;
}
.srs-row:hover { background: rgba(255,255,255,.06); }
.srs-row-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.srs-row-main strong {
  font-size: .95rem;
  color: var(--text);
}
.srs-row-thai {
  font-size: .78rem;
  color: var(--text2, #94a3b8);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.srs-row-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .72rem;
}
.srs-row-cefr {
  background: rgba(96, 165, 250, .15);
  color: #93c5fd;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 600;
}
.srs-row-due {
  background: rgba(251, 146, 60, .18);
  color: #fdba74;
  padding: 2px 8px;
  border-radius: 6px;
}
.srs-row-future {
  color: var(--text2, #94a3b8);
}
.srs-row-int {
  color: var(--text2, #94a3b8);
  font-variant-numeric: tabular-nums;
}
.srs-row-del {
  background: transparent;
  border: 1px solid rgba(248, 113, 113, .25);
  color: #fca5a5;
  padding: 4px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: .95rem;
  transition: all .15s;
}
.srs-row-del:hover {
  background: rgba(248, 113, 113, .15);
  border-color: rgba(248, 113, 113, .5);
}
@media (max-width: 500px) {
  .srs-row { flex-wrap: wrap; }
  .srs-row-meta { width: 100%; justify-content: flex-start; }
}

/* ── Empty state ───────────────────────────────────────── */
.srs-empty {
  background: var(--surface, rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px;
  padding: 40px 24px;
  text-align: center;
}
.srs-empty-icon { font-size: 3.5rem; margin-bottom: 14px; }
.srs-empty-title { margin: 0 0 10px; font-size: 1.3rem; }
.srs-empty-sub {
  color: var(--text2, #94a3b8);
  font-size: .9rem;
  line-height: 1.6;
  margin: 0 0 20px;
}
.srs-empty-pitch {
  background: rgba(96,165,250,.06);
  border: 1px solid rgba(96,165,250,.18);
  border-radius: 12px;
  padding: 14px 16px;
  margin: 0 auto 20px;
  max-width: 460px;
}
.srs-empty-pitch p {
  margin: 8px 0 0;
  color: var(--text2, #94a3b8);
  font-size: .85rem;
}
.srs-empty-more {
  display: block;
  margin: 16px auto 0;
  background: none;
  border: none;
  color: var(--text2, #94a3b8);
  font-size: .85rem;
  cursor: pointer;
  padding: 6px 12px;
}
.srs-empty-more:hover { color: var(--text); }
.srs-empty-levels {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.srs-empty-msg {
  text-align: center;
  padding: 32px;
  color: var(--text2, #94a3b8);
}

/* ── Dot progress ──────────────────────────────────────── */
.srs-dots {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  max-width: 100%;
}
.srs-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,.12);
}
.srs-dot--done { background: linear-gradient(90deg, #60A5FA, #A78BFA); }
.srs-dot--cur {
  background: #60a5fa;
  box-shadow: 0 0 0 3px rgba(96,165,250,.25);
  transform: scale(1.2);
}
.srs-progress-text {
  font-size: .8rem;
  color: var(--text2, #94a3b8);
  font-weight: 600;
}
.srs-flip-cta { text-align: center; margin-top: 24px; }
.srs-kbd-hint {
  text-align: center;
  font-size: .72rem;
  color: var(--text3, #64748b);
  margin-top: 10px;
}

/* ── End screen ────────────────────────────────────────── */
.srs-end {
  background: linear-gradient(135deg, rgba(96,165,250,.05), rgba(167,139,250,.05));
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px;
  padding: 36px 24px;
  text-align: center;
}
.srs-end-icon { font-size: 3.5rem; margin-bottom: 8px; }
.srs-end-title { margin: 0 0 8px; font-size: 1.4rem; }
.srs-end-stats {
  color: var(--text2, #94a3b8);
  margin: 0 0 24px;
}
.srs-end-delta {
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 0 auto 24px;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.srs-delta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .9rem;
}
.srs-delta-label { color: var(--text2, #94a3b8); }
.srs-delta-vals { display: inline-flex; gap: 6px; align-items: center; }
.srs-delta-before { color: var(--text3, #64748b); }
.srs-delta-arrow { color: var(--text3, #64748b); margin: 0 2px; }
.srs-delta-after { color: var(--text); font-weight: 600; }
.srs-delta-up {
  background: rgba(34,197,94,.15);
  color: #4ade80;
  padding: 1px 8px;
  border-radius: 6px;
  font-size: .8rem;
  font-weight: 600;
}
.srs-end-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 500px) {
  .srs-lib-row { grid-template-columns: repeat(2, 1fr); }
  .srs-add-card { flex-direction: column; align-items: stretch; }
  .srs-hero-num { font-size: 2.8rem; }
}

/* ── Session head ──────────────────────────────────────── */
.srs-session-head {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.srs-session-head > span {
  font-weight: 600;
  font-size: .9rem;
  color: var(--text2);
}
.srs-mini-bar {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}
.srs-mini-fill {
  height: 100%;
  background: linear-gradient(90deg, #60A5FA, #A78BFA);
  border-radius: 3px;
  transition: width .3s ease;
}

/* ── Flip card ─────────────────────────────────────── */
.srs-flip {
  position: relative;
  min-height: 280px;
  background: var(--surface);
  border-radius: 20px;
  border: 2px solid var(--surface2);
  cursor: pointer;
  padding: 32px 24px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  transition: all .25s ease;
  user-select: none;
}
.srs-flip:hover { border-color: var(--accent, #60A5FA); }

.srs-front, .srs-back {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.srs-flip:not(.flipped) .srs-back { display: none; }
.srs-flip.flipped .srs-front { display: none; }

.srs-cefr {
  display: inline-block;
  padding: 3px 10px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  background: var(--accent, #60A5FA);
  color: #fff;
  border-radius: 999px;
  margin-bottom: 4px;
}
.srs-word {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
}
.srs-pos {
  font-size: .9rem;
  color: var(--text2);
  font-style: italic;
}
.srs-hint {
  margin-top: 16px;
  font-size: .8rem;
  color: var(--text2);
  opacity: .6;
}

.srs-thai {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text);
}
.srs-sentence {
  font-size: 1rem;
  color: var(--text2);
  font-style: italic;
  margin-top: 12px;
  max-width: 480px;
}
.srs-meta {
  margin-top: 18px;
  font-size: .8rem;
  color: var(--text2);
  opacity: .6;
}

/* hint ที่ด้านหลังการ์ด — บอก user ว่าคลิกกลับได้ */
.srs-back-flip-hint {
  margin-top: 12px;
  font-size: .72rem;
  color: var(--text2);
  opacity: .45;
  letter-spacing: .02em;
  user-select: none;
}

/* ── Grade buttons ─────────────────────────────────── */
.srs-grade-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 24px;
}
.srs-grade {
  padding: 16px 8px;
  border: 2px solid var(--surface2);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 1.4rem;
  cursor: pointer;
  text-align: center;
  line-height: 1.2;
  transition: all .15s ease;
}
.srs-grade strong {
  display: block;
  font-size: .85rem;
  margin-top: 6px;
}
.srs-grade small {
  display: block;
  font-size: .7rem;
  color: var(--text2);
  margin-top: 2px;
  font-weight: normal;
}
.srs-grade:hover { transform: translateY(-2px); }

.srs-g0 { border-color: #EF4444; }
.srs-g0:hover { background: rgba(239, 68, 68, 0.12); }
.srs-g1 { border-color: #F59E0B; }
.srs-g1:hover { background: rgba(245, 158, 11, 0.12); }
.srs-g2 { border-color: #10B981; }
.srs-g2:hover { background: rgba(16, 185, 129, 0.12); }
.srs-g3 { border-color: #60A5FA; }
.srs-g3:hover { background: rgba(96, 165, 250, 0.12); }

/* ── Mobile ────────────────────────────────────────── */
@media (max-width: 600px) {
  .srs-word { font-size: 2rem; }
  .srs-thai { font-size: 1.5rem; }
  .srs-grade { font-size: 1.1rem; padding: 12px 4px; }
  .srs-grade strong { font-size: .75rem; }
  .srs-grade small { font-size: .65rem; }
}