:root {
  --bg: #0f1c17;
  --bg-soft: #162820;
  --panel: #1a3127;
  --panel-2: #214033;
  --line: rgba(214, 232, 214, 0.12);
  --text: #eef6ef;
  --muted: #9bb5a4;
  --accent: #3ecf8e;
  --accent-2: #f0c75e;
  --danger: #ff6b6b;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { min-height: 100%; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

button, input, select { font: inherit; color: inherit; }

.view { min-height: 100vh; }
/* Author display rules must not defeat the HTML hidden attribute */
.view[hidden] { display: none !important; }

/* ── Login ── */
.login-view {
  display: grid;
  place-items: center;
  padding: 32px 20px;
  position: relative;
  overflow: hidden;
}

.login-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 15% 20%, rgba(62, 207, 142, 0.28), transparent 55%),
    radial-gradient(ellipse 70% 50% at 85% 75%, rgba(240, 199, 94, 0.18), transparent 50%),
    linear-gradient(160deg, #0c1612 0%, #143024 45%, #0f1c17 100%);
}

.login-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(238, 246, 239, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(238, 246, 239, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 40%, black, transparent 75%);
}

.login-panel {
  position: relative;
  width: min(520px, 100%);
  padding: 40px 36px;
  border-radius: 28px;
  background: rgba(22, 40, 32, 0.82);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  animation: rise 0.7s ease both;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  margin-bottom: 18px;
}

.login-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.login-sub {
  color: var(--muted);
  margin-bottom: 28px;
  font-size: 15px;
}

.login-form label,
.dialog-form label {
  display: block;
  margin-bottom: 14px;
}

.login-form label > span,
.dialog-form label > span {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

input, select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus {
  border-color: rgba(62, 207, 142, 0.55);
  box-shadow: 0 0 0 3px rgba(62, 207, 142, 0.15);
}

.code-row { display: flex; gap: 10px; }
.code-row input { flex: 1; }

.hint {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(240, 199, 94, 0.12);
  color: var(--accent-2);
  font-size: 13px;
}

.btn {
  border: none;
  border-radius: 12px;
  padding: 11px 16px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.15s, opacity 0.15s, background 0.15s;
}

.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-primary {
  background: linear-gradient(135deg, #3ecf8e, #2aa86f);
  color: #062015;
}

.btn-ghost {
  background: rgba(238, 246, 239, 0.06);
  border: 1px solid var(--line);
  color: var(--text);
}

.btn-danger {
  background: rgba(255, 107, 107, 0.12);
  color: var(--danger);
  border: 1px solid rgba(255, 107, 107, 0.25);
  padding: 6px 10px;
  font-size: 12px;
}

.btn-block { width: 100%; }
.btn-sm { padding: 7px 12px; font-size: 13px; }

/* ── App shell ── */
.app-view {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 50% 40% at 100% 0%, rgba(62, 207, 142, 0.12), transparent 50%),
    var(--bg);
}

.sidebar {
  border-right: 1px solid var(--line);
  background: rgba(18, 32, 26, 0.9);
  padding: 22px 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.sidebar-brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 4px 8px 12px;
}

.brand-dot {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--accent), #1f8f5f);
  box-shadow: 0 8px 20px rgba(62, 207, 142, 0.3);
}

.sidebar-brand strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
}

.sidebar-brand small {
  color: var(--muted);
  font-size: 12px;
}

.sidebar-lib {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 0 8px 8px;
}

.lib-switch-label {
  font-size: 12px;
  color: var(--muted);
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-btn {
  text-align: left;
  padding: 11px 14px;
  border-radius: 12px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 500;
}

.nav-btn:hover:not(:disabled) {
  background: rgba(62, 207, 142, 0.08);
  color: var(--text);
}

.nav-btn.active {
  background: rgba(62, 207, 142, 0.14);
  color: var(--accent);
}

.nav-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.sidebar-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lib-switch {
  background: var(--panel);
}

.main {
  padding: 28px 32px 48px;
  max-width: 1100px;
}

.page-head { margin-bottom: 22px; }
.page-head h2 {
  font-family: var(--font-display);
  font-size: 30px;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.page-head p { color: var(--muted); }
.row-between {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.stat-card {
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  animation: rise 0.5s ease both;
}

.stat-card .value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
}

.stat-card .label {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.panel {
  background: rgba(26, 49, 39, 0.7);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
}

.panel h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin-bottom: 14px;
}

.tip-panel ol {
  padding-left: 18px;
  color: var(--muted);
}
.tip-panel li { margin-bottom: 6px; }
kbd {
  font-family: var(--font-body);
  font-size: 12px;
  padding: 1px 6px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.25);
}

.chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 160px;
}

.chart-bar-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  height: 100%;
  justify-content: flex-end;
}

.chart-bar {
  width: 100%;
  max-width: 28px;
  min-height: 4px;
  border-radius: 8px 8px 0 0;
  background: linear-gradient(to top, #2aa86f, var(--accent-2));
}

.chart-val { font-size: 11px; color: var(--text); font-weight: 600; min-height: 14px; }
.chart-lbl { font-size: 11px; color: var(--muted); }

.lib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.lib-card {
  background: linear-gradient(165deg, var(--panel), #1d3a2e);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
}

.lib-card:hover {
  transform: translateY(-2px);
  border-color: rgba(62, 207, 142, 0.4);
}

.lib-card.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(62, 207, 142, 0.35);
}

.lib-card .code {
  font-size: 12px;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.lib-card h4 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 6px 0 4px;
}

.lib-card .meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 12px;
}

.lib-card .actions {
  display: flex;
  gap: 8px;
}

/* Dropzone */
.dropzone {
  border: 2px dashed rgba(62, 207, 142, 0.35);
  border-radius: 24px;
  background:
    radial-gradient(circle at 30% 20%, rgba(62, 207, 142, 0.08), transparent 45%),
    rgba(26, 49, 39, 0.55);
  min-height: 220px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  outline: none;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(62, 207, 142, 0.12);
  transform: scale(1.01);
}

.dropzone-inner { text-align: center; padding: 24px; }
.drop-title {
  font-family: var(--font-display);
  font-size: 24px;
  margin-bottom: 8px;
}
.drop-sub { color: var(--muted); margin-bottom: 18px; }

.upload-status {
  margin-bottom: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(62, 207, 142, 0.1);
  border: 1px solid rgba(62, 207, 142, 0.25);
}

.upload-result .block {
  margin-bottom: 16px;
}

.upload-result .word-chip {
  display: inline-flex;
  gap: 6px;
  align-items: baseline;
  padding: 8px 12px;
  margin: 0 8px 8px 0;
  border-radius: 999px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--line);
  font-size: 13px;
}

.upload-result .word-chip strong { color: var(--accent); }

.material-list { display: flex; flex-direction: column; gap: 10px; }
.material-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--line);
  font-size: 14px;
}
.material-item .status-done { color: var(--accent); }
.material-item .status-failed { color: var(--danger); }
.material-item .status-processing { color: var(--accent-2); }

table { width: 100%; border-collapse: collapse; }
th, td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  vertical-align: top;
}
th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(62, 207, 142, 0.15);
  color: var(--accent);
}

.sentence-list { display: flex; flex-direction: column; gap: 12px; }
.sentence-card {
  background: rgba(26, 49, 39, 0.7);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.sentence-card .orig {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.6;
}
.sentence-card .meta-line {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 4px;
}
.sentence-card .top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 36px 12px;
}

dialog {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 0;
  background: var(--panel);
  color: var(--text);
  width: min(420px, calc(100% - 32px));
  box-shadow: var(--shadow);
}

dialog::backdrop {
  background: rgba(5, 12, 9, 0.72);
  backdrop-filter: blur(4px);
}

.dialog-form { padding: 22px; }
.dialog-form h3 {
  font-family: var(--font-display);
  margin-bottom: 14px;
}
.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.preset-chip {
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.2);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}
.preset-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 16px;
  border-radius: 12px;
  background: #123628;
  border: 1px solid rgba(62, 207, 142, 0.4);
  box-shadow: var(--shadow);
  z-index: 50;
  animation: rise 0.25s ease;
}

.page-size {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}
.page-size select {
  width: auto;
  min-width: 72px;
  padding: 8px 10px;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}
.page-btn {
  padding: 7px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.2);
  color: var(--text);
  cursor: pointer;
}
.page-btn:hover:not([disabled]) {
  border-color: var(--accent);
  color: var(--accent);
}
.page-btn[disabled] { opacity: 0.4; cursor: not-allowed; }
.page-info { font-size: 13px; color: var(--muted); }
.phonetic { color: var(--accent-2); font-size: 13px; }

.review-header { text-align: center; margin-bottom: 16px; }
.review-header h3 { font-family: var(--font-display); font-size: 22px; margin-bottom: 4px; }
.review-header p { color: var(--muted); }
.review-progress { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; max-width: 600px; margin-left: auto; margin-right: auto; }
.review-progress-bar { flex: 1; height: 8px; background: rgba(238,246,239,0.08); border-radius: 999px; overflow: hidden; }
.review-progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.review-progress-text { font-size: 13px; color: var(--muted); white-space: nowrap; }

.flashcard {
  max-width: 600px;
  margin: 0 auto 20px;
  perspective: 1000px;
  min-height: 220px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 220px;
  transition: transform 0.5s;
  transform-style: preserve-3d;
}
.flashcard-inner.flipped { transform: rotateY(180deg); }
.flashcard-front, .flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 18px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 1px solid var(--line);
}
.flashcard-front {
  background: rgba(26, 49, 39, 0.9);
  border-color: rgba(62, 207, 142, 0.45);
  cursor: pointer;
}
.flashcard-front .word {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
}
.flashcard-front .phonetic { text-align: center; margin-top: 8px; }
.flashcard-front .hint { font-size: 13px; color: var(--muted); text-align: center; margin-top: 14px; }
.flashcard-front .level-badge { text-align: center; margin-bottom: 10px; }
.flashcard-back {
  background: linear-gradient(160deg, #1d3a2e, #143024);
  transform: rotateY(180deg);
}
.flashcard-back .meaning {
  font-size: 20px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 8px;
}
.flashcard-back .pos,
.flashcard-back .example {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}
.review-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  max-width: 600px;
  margin: 0 auto;
}
.btn-forgot, .btn-remember {
  padding: 12px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
}
.btn-forgot {
  border: 1px solid rgba(255, 107, 107, 0.45);
  color: var(--danger);
}
.btn-remember {
  border: 1px solid rgba(62, 207, 142, 0.5);
  color: var(--accent);
}
.btn-forgot:hover { background: rgba(255, 107, 107, 0.12); }
.btn-remember:hover { background: rgba(62, 207, 142, 0.12); }
.review-empty, .review-summary {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
}
.review-summary {
  max-width: 480px;
  margin: 30px auto;
  border: 1px solid rgba(62, 207, 142, 0.35);
  border-radius: 18px;
  background: rgba(26, 49, 39, 0.7);
}
.review-summary h2 {
  font-family: var(--font-display);
  color: var(--accent);
  margin-bottom: 10px;
}
.review-summary .btn { margin-top: 16px; }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 860px) {
  .app-view {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 5;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .side-nav {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .main { padding: 20px 16px 40px; }
  .row-between { flex-direction: column; }
}