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

:root {
  --bg: #f8f9fa;
  --panel-bg: #ffffff;
  --border: #dee2e6;
  --text: #212529;
  --text-muted: #6c757d;
  --accent: #0d6efd;
  --accent-hover: #0b5ed7;
  --danger: #dc3545;
  --success: #198754;
  --highlight: #fff3cd;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --radius: 8px;
  --font-mono: 'Consolas', 'Courier New', monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1d23;
    --panel-bg: #212529;
    --border: #373b3e;
    --text: #e9ecef;
    --text-muted: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --danger: #ef4444;
    --success: #22c55e;
    --highlight: #3d3520;
  }
}

html, body { height: 100%; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: stretch;
  padding: 1rem;
}

#mobile-nav { display: none; }

/* User area and stats */
#user-area {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem;
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  flex-shrink: 0;
}
#user-area #user-name { flex: 1 1 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#user-area button, #user-area a {
  background: none; border: 1px solid var(--border); border-radius: 4px;
  padding: 0.25rem 0.5rem; font-size: 0.75rem; cursor: pointer;
  color: var(--text-muted); text-decoration: none; white-space: nowrap;
}
#user-area button:hover, #user-area a:hover { border-color: var(--accent); color: var(--accent); }

#stats-panel { border-top: 1px solid var(--border); flex-shrink: 0; max-height: 260px; overflow-y: auto; }
#stats-content { padding: 0.6rem 1rem; font-size: 0.8rem; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.4rem; margin-top: 0.4rem; }
.stat-item { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem; }
.stat-item .stat-value { font-size: 1.1rem; font-weight: 700; color: var(--accent); }
.stat-item .stat-label { font-size: 0.7rem; color: var(--text-muted); }
.daily-stats { margin-top: 0.5rem; font-size: 0.75rem; color: var(--text-muted); }

.favorite-btn {
  background: none; border: 1px solid var(--border); border-radius: 4px;
  padding: 0.15rem 0.4rem; font-size: 0.75rem; cursor: pointer;
  color: var(--text-muted); line-height: 1;
}
.favorite-btn.active { border-color: #f59f00; color: #f59f00; }
.favorite-btn:hover { border-color: #f59f00; }

#app {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  gap: 1rem;
  width: 100%;
  max-width: 1200px;
  min-height: 0;
}

#app > * {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  gap: 0.5rem;
}

.panel-header h2 { font-size: 0.95rem; font-weight: 600; }

/* Left panel — entry list */
#panel-list { overflow-y: auto; }
#entry-list {
  list-style: none;
  flex: 1;
  overflow-y: auto;
}
#entry-list li {
  padding: 0.75rem 1rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
#entry-list li:hover { background: var(--highlight); }
#entry-list li.active { background: var(--highlight); border-left: 3px solid var(--accent); }
#entry-list .entry-date { font-size: 0.75rem; color: var(--text-muted); }
#entry-list .entry-preview { font-size: 0.85rem; margin-top: 0.15rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.entry-actions { display: none; gap: 0.3rem; margin-top: 0.3rem; }
#entry-list li:hover .entry-actions { display: flex; }
.entry-actions button {
  background: none; border: 1px solid var(--border); border-radius: 4px;
  padding: 0.15rem 0.4rem; font-size: 0.7rem; cursor: pointer; color: var(--text-muted);
}
.entry-actions .btn-delete { color: var(--danger); border-color: var(--danger); }

#btn-new {
  background: var(--accent); color: #fff; border: none;
  width: 28px; height: 28px; border-radius: 6px;
  font-size: 1.2rem; cursor: pointer; line-height: 1;
}
#btn-new:hover { background: var(--accent-hover); }

/* Grammar quick access */
#grammar-quick {
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.grammar-header {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}
.more-link {
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
}
.more-link:hover { text-decoration: underline; }
#grammar-list {
  list-style: none;
  padding: 0.25rem 0;
  max-height: 220px;
  overflow-y: auto;
}
#grammar-list li {
  padding: 0.35rem 1rem;
  font-size: 0.8rem;
}
#grammar-list a {
  color: var(--text);
  text-decoration: none;
  display: block;
}
#grammar-list a:hover { color: var(--accent); }

/* Center panel — editor */
#panel-editor { display: flex; flex-direction: column; }
#entry-date {
  border: 1px solid var(--border); border-radius: 4px;
  padding: 0.3rem 0.5rem; font-size: 0.85rem;
  background: var(--panel-bg); color: var(--text);
}
#btn-save {
  background: var(--accent); color: #fff; border: none;
  padding: 0.35rem 0.75rem; border-radius: 6px;
  font-size: 0.85rem; cursor: pointer; white-space: nowrap;
}
#btn-save:hover { background: var(--accent-hover); }
#btn-helper {
  background: none; border: 1px solid var(--accent); color: var(--accent);
  padding: 0.35rem 0.75rem; border-radius: 6px;
  font-size: 0.85rem; cursor: pointer; white-space: nowrap;
}
#btn-helper:hover { background: var(--accent); color: #fff; }
#entry-text {
  flex: 1; resize: none; border: none; padding: 1rem;
  font-size: 1.05rem; line-height: 1.7;
  font-family: var(--font-mono);
  background: transparent; color: var(--text);
  outline: none;
}
#entry-hint { padding: 0.5rem 1rem; font-size: 0.75rem; color: var(--text-muted); border-top: 1px solid var(--border); }

/* Editor panel - live translation section */
#editor-translate { border-top: 1px solid var(--border); padding: 0.5rem 1rem; }
.editor-section-title { font-size: 0.75rem; font-weight: 600; color: var(--text-muted); margin-bottom: 0.4rem; }
.editor-translate-line { display: flex; gap: 0.4rem; margin-bottom: 0.25rem; font-size: 0.85rem; line-height: 1.5; }
.et-label { font-weight: 600; color: var(--text-muted); white-space: nowrap; min-width: 2.5rem; }
.et-text { color: var(--text); flex: 1; }
#selection-translate { margin-top: 0.3rem; padding: 0.3rem 0.5rem; background: var(--highlight); border-radius: 4px; }

/* Editor panel - vocabulary section */
#editor-vocab { border-top: 1px solid var(--border); padding: 0.5rem 1rem; max-height: 180px; overflow-y: auto; }
.vocab-item { display: flex; align-items: center; gap: 0.4rem; padding: 0.25rem 0; font-size: 0.85rem; border-bottom: 1px solid var(--border); }
.vocab-item:last-child { border-bottom: none; }
.vocab-word { font-weight: 600; font-family: var(--font-mono); color: var(--accent); min-width: 6rem; }
.vocab-en { color: var(--text-muted); flex: 1; }
.vocab-zh { color: var(--text); min-width: 3rem; }
.vocab-speech { background: none; border: 1px solid var(--border); border-radius: 4px; padding: 0.15rem 0.4rem; font-size: 0.7rem; cursor: pointer; color: var(--text-muted); line-height: 1; }
.vocab-speech:hover { border-color: var(--accent); color: var(--accent); }

/* Right panel — translation */
#panel-translate { overflow-y: auto; }
.translate-section {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}
.translate-label { font-size: 0.8rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-muted); }
.translate-text {
  font-size: 0.95rem; line-height: 1.6;
  min-height: 3rem; padding: 0.5rem;
  background: var(--bg); border-radius: 4px;
}
.btn-speech {
  background: none; border: 1px solid var(--border); border-radius: 4px;
  padding: 0.25rem 0.6rem; font-size: 0.75rem; cursor: pointer;
  margin-top: 0.5rem; color: var(--text-muted);
}
.btn-speech:hover { border-color: var(--accent); color: var(--accent); }

/* Modal overlay for delete confirmation */
#modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  align-items: center; justify-content: center;
  z-index: 100;
}
#modal-overlay.show { display: flex; }
#modal-box {
  background: var(--panel-bg); border-radius: var(--radius);
  padding: 1.5rem; max-width: 360px; width: 90%;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
#modal-box p { margin-bottom: 1rem; font-size: 0.9rem; }
#modal-box .modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; }
#modal-box button {
  padding: 0.4rem 1rem; border-radius: 6px; border: 1px solid var(--border);
  cursor: pointer; font-size: 0.85rem;
}
#modal-box .btn-cancel { background: var(--panel-bg); color: var(--text); }
#modal-box .btn-confirm { background: var(--danger); color: #fff; border-color: var(--danger); }

/* Chinese to Spanish helper modal */
#helper-modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  align-items: center; justify-content: center;
  z-index: 110;
}
#helper-modal-overlay.show { display: flex; }
#helper-modal-box {
  background: var(--panel-bg); border-radius: var(--radius);
  padding: 1.5rem; max-width: 520px; width: 90%;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
#helper-modal-box h3 {
  font-size: 1rem; margin-bottom: 0.75rem;
}
#helper-input {
  width: 100%; min-height: 90px; resize: vertical;
  border: 1px solid var(--border); border-radius: 6px;
  padding: 0.6rem; font-size: 0.95rem; line-height: 1.6;
  background: var(--bg); color: var(--text); outline: none;
}
#helper-input:focus { border-color: var(--accent); }
#helper-preview {
  margin: 0.75rem 0 1rem;
  padding: 0.6rem 0.75rem;
  background: var(--code-bg, var(--bg));
  border-radius: 6px;
  font-size: 0.9rem;
  min-height: 2.5rem;
}
.helper-preview-label { color: var(--text-muted); font-weight: 600; }
#helper-result { font-family: var(--font-mono); color: var(--accent); }
#helper-modal-box .modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; }
#helper-modal-box .modal-actions button {
  padding: 0.4rem 1rem; border-radius: 6px; border: 1px solid var(--border);
  cursor: pointer; font-size: 0.85rem;
}
#helper-modal-box .btn-cancel { background: var(--panel-bg); color: var(--text); }
#helper-modal-box .btn-confirm {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
#helper-modal-box .btn-confirm:disabled {
  opacity: 0.45; cursor: not-allowed;
}

/* Translation settings modal */
#settings-modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  align-items: center; justify-content: center;
  z-index: 120;
}
#settings-modal-overlay.show { display: flex; }
#settings-modal-box {
  background: var(--panel-bg); border-radius: var(--radius);
  padding: 1.5rem; max-width: 480px; width: 90%;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  max-height: 90vh; overflow-y: auto;
}
#settings-modal-box h3 { font-size: 1rem; margin-bottom: 0.75rem; }
#settings-modal-box label { display: block; font-size: 0.8rem; color: var(--text-muted); margin: 0.6rem 0 0.25rem; }
#settings-modal-box select, #settings-modal-box input, #settings-modal-box textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 6px;
  padding: 0.45rem 0.6rem; font-size: 0.85rem;
  background: var(--bg); color: var(--text); outline: none;
}
#settings-modal-box select:focus, #settings-modal-box input:focus, #settings-modal-box textarea:focus {
  border-color: var(--accent);
}
#settings-modal-box .modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; margin-top: 1rem; }
#settings-modal-box .modal-actions button {
  padding: 0.4rem 1rem; border-radius: 6px; border: 1px solid var(--border);
  cursor: pointer; font-size: 0.85rem;
}
#settings-modal-box .btn-confirm { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Change password modal */
#password-modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  align-items: center; justify-content: center;
  z-index: 130;
}
#password-modal-overlay.show { display: flex; }
#password-modal-box {
  background: var(--panel-bg); border-radius: var(--radius);
  padding: 1.5rem; max-width: 420px; width: 90%;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
#password-modal-box h3 { font-size: 1rem; margin-bottom: 0.75rem; }
#password-modal-box label { display: block; font-size: 0.8rem; color: var(--text-muted); margin: 0.6rem 0 0.25rem; }
#password-modal-box input {
  width: 100%; border: 1px solid var(--border); border-radius: 6px;
  padding: 0.45rem 0.6rem; font-size: 0.85rem;
  background: var(--bg); color: var(--text); outline: none;
}
#password-modal-box input:focus { border-color: var(--accent); }
#password-msg {
  min-height: 1.4em; font-size: 0.8rem; color: var(--danger);
  margin-top: 0.6rem;
}
#password-modal-box .modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; margin-top: 1rem; }
#password-modal-box .modal-actions button {
  padding: 0.4rem 1rem; border-radius: 6px; border: 1px solid var(--border);
  cursor: pointer; font-size: 0.85rem;
}
#password-modal-box .btn-cancel { background: var(--panel-bg); color: var(--text); }
#password-modal-box .btn-confirm { background: var(--accent); color: #fff; border-color: var(--accent); }

@media (max-width: 768px) {
  body { padding: 0; }
  #mobile-nav {
    display: flex; position: sticky; top: 0; z-index: 80;
    background: var(--panel-bg); border-bottom: 1px solid var(--border);
    padding: 0.4rem;
  }
  #mobile-nav button {
    flex: 1; min-height: 40px; background: none; border: 1px solid var(--border);
    border-radius: 6px; font-size: 0.85rem; cursor: pointer; color: var(--text-muted);
  }
  #mobile-nav button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
  #app { grid-template-columns: 1fr; gap: 0; padding: 0.5rem; }
  #panel-list { max-height: calc(100vh - 60px); }
  #panel-editor { min-height: calc(100vh - 60px); }
  #panel-translate { max-height: calc(100vh - 60px); }

  #panel-editor, #panel-translate, #stats-panel { display: none; }
  body[data-view="editor"] #panel-editor { display: flex; }
  body[data-view="editor"] #panel-list, body[data-view="editor"] #panel-translate, body[data-view="editor"] #stats-panel { display: none; }
  body[data-view="translate"] #panel-translate { display: flex; }
  body[data-view="translate"] #panel-list, body[data-view="translate"] #panel-editor, body[data-view="translate"] #stats-panel { display: none; }
  body[data-view="mine"] #stats-panel { display: flex; }
  body[data-view="mine"] #panel-list { display: flex; }
  body[data-view="mine"] #entry-list, body[data-view="mine"] #grammar-quick { display: none; }
}