:root {
  --bg: #07070c;
  --surface: #0e0e16;
  --surface-2: #15151f;
  --surface-3: #1c1c28;
  --border: #2a2a3d;
  --border-soft: #222233;
  --text: #ebe8e4;
  --text-muted: #8b8796;
  --text-dim: #5c5868;
  --purple: #7c5cbf;
  --purple-deep: #5a3d9a;
  --purple-glow: rgba(124, 92, 191, 0.35);
  --purple-soft: rgba(124, 92, 191, 0.12);
  --danger: #c45c6a;
  --success: #5c9c7a;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 7px;
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --shadow-soft: 0 4px 16px rgba(0, 0, 0, 0.3);
}

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

html, body {
  height: 100%;
}

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

.hidden { display: none !important; }

/* ========== BUTTONS ========== */
button {
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  border: none;
  border-radius: var(--radius-sm);
  transition: all 0.22s ease;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--purple) 0%, var(--purple-deep) 100%);
  color: #fff;
  padding: 0.7rem 1.25rem;
  font-weight: 600;
  box-shadow: 0 4px 18px var(--purple-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--purple-glow);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--purple);
  background: var(--purple-soft);
}

.btn-icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 1rem;
}

.btn-icon:hover {
  color: var(--text);
  border-color: var(--purple);
  background: var(--purple-soft);
}

.btn-ghost.danger,
.btn-icon.danger {
  color: var(--danger);
  border-color: rgba(196, 92, 106, 0.35);
}

.btn-ghost.danger:hover,
.btn-icon.danger:hover {
  color: #fff;
  background: var(--danger);
  border-color: var(--danger);
}

/* ========== LOGIN ========== */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(90, 61, 154, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse at center, #0f0f18 0%, #07070c 75%);
}

.login-box {
  width: 100%;
  max-width: 380px;
  padding: 2.75rem 2.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow);
}

.logo-mark {
  font-size: 2.8rem;
  color: var(--purple);
  margin-bottom: 0.4rem;
  line-height: 1;
  text-shadow: 0 0 28px var(--purple-glow);
}

.logo-mark.small {
  font-size: 1.5rem;
  margin: 0;
}

.logo-mark.large {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.7;
}

.title {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 0.2rem;
}

.subtitle {
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 2rem;
  font-size: 1.15rem;
}

.hint {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

.hint.centered {
  text-align: center;
  padding: 1rem;
}

input[type="password"],
input[type="text"],
input[type="search"] {
  width: 100%;
  padding: 0.8rem 1.1rem;
  margin-bottom: 0.7rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 3px var(--purple-soft);
}

.error {
  color: var(--danger);
  font-size: 0.88rem;
  margin-top: 0.6rem;
}

/* ========== APP SHELL ========== */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.85rem 1.4rem;
  border-bottom: 1px solid var(--border-soft);
  background: var(--surface);
  position: relative;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

header .title {
  font-size: 1.45rem;
  margin: 0;
  letter-spacing: 0.04em;
}

.search-wrap {
  flex: 1;
  max-width: 420px;
  position: relative;
}

#global-search {
  margin: 0;
  padding-left: 1.1rem;
  background: var(--surface-2);
}

.search-results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  max-height: 360px;
  overflow-y: auto;
  z-index: 50;
}

.search-item {
  padding: 0.75rem 1rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border-soft);
  transition: background 0.15s;
}

.search-item:last-child {
  border-bottom: none;
}

.search-item:hover {
  background: var(--purple-soft);
}

.search-item .s-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.search-item .s-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 0.15rem;
}

.search-item .s-preview {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-empty {
  padding: 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}

/* ========== LAYOUT ========== */
.layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#sidebar {
  width: 250px;
  background: var(--surface);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--border-soft);
}

.sidebar-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

#volume-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  padding: 0.4rem 0;
}

#volume-list li {
  padding: 0.7rem 1.15rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.15s;
  border-left: 3px solid transparent;
}

#volume-list li:hover {
  background: var(--surface-2);
}

#volume-list li.active {
  background: var(--purple-soft);
  border-left-color: var(--purple);
}

#volume-list li .vol-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 1rem;
}

#volume-list li .page-count {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  background: var(--surface-3);
  padding: 0.15rem 0.45rem;
  border-radius: 20px;
}

.sidebar-footer {
  padding: 0.75rem 1.15rem;
  border-top: 1px solid var(--border-soft);
}

/* ========== MAIN ========== */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 50% at 80% 10%, rgba(90, 61, 154, 0.07) 0%, transparent 50%),
    var(--bg);
}

.view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.view-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 1.4rem;
  border-bottom: 1px solid var(--border-soft);
  background: var(--surface);
  min-height: 58px;
}

.vol-title-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.vol-title-wrap h2 {
  font-size: 1.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.view-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#page-title {
  flex: 1;
  margin: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  padding: 0.25rem 0;
  border-radius: 0;
}

#page-title:focus {
  border-bottom-color: var(--purple);
  box-shadow: none;
}

/* PAGES GRID */
.pages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1.1rem;
  padding: 1.4rem;
  overflow-y: auto;
}

.page-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  cursor: pointer;
  transition: all 0.22s ease;
  min-height: 155px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.page-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--purple-deep), var(--purple));
  opacity: 0;
  transition: opacity 0.22s;
}

.page-card:hover {
  border-color: var(--purple);
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft), 0 0 0 1px var(--purple-soft);
}

.page-card:hover::before {
  opacity: 1;
}

.page-card h3 {
  font-size: 1.08rem;
  margin-bottom: 0.45rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-card .preview {
  flex: 1;
  font-size: 0.86rem;
  color: var(--text-muted);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  font-family: var(--font-mono);
  line-height: 1.45;
}

.page-card .meta {
  margin-top: 0.7rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.page-card.empty-slot {
  border-style: dashed;
  border-color: var(--border);
  opacity: 0.55;
  justify-content: center;
  align-items: center;
  color: var(--text-dim);
  background: transparent;
}

.page-card.empty-slot:hover {
  opacity: 0.9;
  border-color: var(--purple);
  transform: none;
  box-shadow: none;
}

.page-card.empty-slot::before {
  display: none;
}

/* EDITOR */
#page-content {
  flex: 1;
  width: 100%;
  padding: 1.5rem 1.6rem;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.75;
  resize: none;
  outline: none;
}

.editor-footer {
  display: flex;
  justify-content: space-between;
  padding: 0.55rem 1.5rem;
  border-top: 1px solid var(--border-soft);
  background: var(--surface);
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* EMPTY STATE */
#empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-message {
  text-align: center;
  color: var(--text-muted);
}

.empty-message p {
  font-size: 1.25rem;
}

.empty-message .sub {
  font-size: 1rem;
  margin-top: 0.3rem;
  color: var(--text-dim);
}

.empty-message .btn-primary {
  margin-top: 1.75rem;
  padding: 0.8rem 1.6rem;
}

/* MODALS */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(4, 4, 8, 0.78);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.85rem;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
}

.modal-content h3 {
  margin-bottom: 1.2rem;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
}

.modal-actions {
  display: flex;
  gap: 0.7rem;
  margin-top: 1.1rem;
}

.modal-actions button {
  flex: 1;
}

/* TOAST */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  z-index: 200;
  animation: toastIn 0.3s ease;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(12px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* SCROLLBAR */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--purple-deep);
}

/* RESPONSIVE */
@media (max-width: 820px) {
  header {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  .search-wrap {
    order: 3;
    max-width: 100%;
    flex: 1 1 100%;
  }
  .layout {
    flex-direction: column;
  }
  #sidebar {
    width: 100%;
    max-height: 170px;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
  }
  .pages-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 460px) {
  .pages-grid {
    grid-template-columns: 1fr;
  }
  .header-actions .btn-ghost {
    display: none;
  }
}