/* ── TOKENS ── */
:root {
  --bg:            #090d17;
  --bg-surface:    #0d1423;
  --bg-raised:     #121a2c;
  --bg-input:      #080c16;
  --border:        #1b2a3f;
  --border-bright: #263d5a;
  --text:          #c6d4e3;
  --text-muted:    #586f87;
  --text-subtle:   #2c3e52;
  --accent:        #4d9ef0;
  --accent-glow:   rgba(77, 158, 240, 0.12);
  --accent-dim:    #152840;
  --gold:          #c99038;
  --danger:        #d4545a;
  --success:       #4a9e72;
  --font:          'Inter', system-ui, -apple-system, sans-serif;
  --mono:          'JetBrains Mono', 'Fira Code', monospace;
  --sidebar-w:     264px;
  --topbar-h:      52px;
  --r:             5px;
  --t:             160ms ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}


/* ════════════════════════════════════════
   LAYOUT
════════════════════════════════════════ */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
}


/* ════════════════════════════════════════
   SIDEBAR
════════════════════════════════════════ */

.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Logo */

.sidebar-header {
  padding: 20px 18px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-saber {
  width: 3px;
  height: 38px;
  background: linear-gradient(to bottom, #a8d8ff 0%, var(--accent) 50%, #1055a0 100%);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--accent), 0 0 22px rgba(77, 158, 240, 0.35);
  flex-shrink: 0;
  animation: saberFlicker 4s ease-in-out infinite;
}

@keyframes saberFlicker {
  0%, 100% { opacity: 1;    box-shadow: 0 0 10px var(--accent), 0 0 22px rgba(77,158,240,0.35); }
  45%       { opacity: 0.9; box-shadow: 0 0 6px  var(--accent), 0 0 14px rgba(77,158,240,0.25); }
  50%       { opacity: 1;   box-shadow: 0 0 14px var(--accent), 0 0 30px rgba(77,158,240,0.45); }
}

.logo-text { display: flex; flex-direction: column; }

.logo-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--text);
  line-height: 1.2;
}

.logo-studio {
  font-size: 0.62rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 2px;
}

/* Nav */

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 14px 0 8px;
}

.nav-section-label {
  padding: 0 18px 8px;
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.855rem;
  transition: color var(--t), background var(--t);
  position: relative;
  user-select: none;
  border-left: 2px solid transparent;
}

.nav-item:hover {
  color: var(--text);
  background: rgba(255,255,255,0.025);
}

.nav-item.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-left-color: var(--accent);
}

.nav-item.active::after {
  content: '';
  position: absolute;
  left: -2px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.nav-icon {
  font-size: 0.75rem;
  opacity: 0.55;
  flex-shrink: 0;
  font-style: normal;
}

/* Progress */

.sidebar-progress {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.progress-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: 12px;
}

.tier-row { margin-bottom: 9px; }

.tier-row-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
}

.tier-name  { font-size: 0.68rem; color: var(--text-muted); }
.tier-count { font-size: 0.62rem; font-family: var(--mono); color: var(--text-subtle); }

.tier-bar {
  height: 3px;
  background: var(--bg-raised);
  border-radius: 2px;
  overflow: hidden;
}

.tier-fill {
  height: 100%;
  border-radius: 2px;
  width: 0%;
  transition: width 700ms cubic-bezier(0.4, 0, 0.2, 1);
}

.tier-fill.t1 { background: var(--accent);  box-shadow: 0 0 6px rgba(77,158,240,0.5); }
.tier-fill.t2 { background: var(--gold);    box-shadow: 0 0 6px rgba(201,144,56,0.4); }
.tier-fill.t3 { background: var(--success); box-shadow: 0 0 6px rgba(74,158,114,0.4); }
.tier-fill.t4 { background: var(--text-muted); }


/* Token button */

.sidebar-token {
  padding: 10px 18px 14px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.token-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.72rem;
  color: var(--text-muted);
  transition: all var(--t);
}

.token-btn:hover {
  border-color: var(--border-bright);
  color: var(--text);
  background: rgba(255,255,255,0.03);
}

.token-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-subtle);
  flex-shrink: 0;
  transition: background var(--t), box-shadow var(--t);
}

.token-dot.set {
  background: var(--success);
  box-shadow: 0 0 6px rgba(74,158,114,0.5);
}


/* ════════════════════════════════════════
   MAIN
════════════════════════════════════════ */

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

/* Topbar */

.topbar {
  height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  flex-shrink: 0;
  gap: 16px;
  background: var(--bg);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.doc-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-meta {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-family: var(--mono);
  white-space: nowrap;
  flex-shrink: 0;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}


/* ════════════════════════════════════════
   BUTTONS
════════════════════════════════════════ */

.btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 13px;
  border-radius: var(--r);
  border: 1px solid transparent;
  font-family: var(--font);
  font-size: 0.775rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t);
  white-space: nowrap;
  line-height: 1;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}
.btn-ghost:hover:not(:disabled) {
  border-color: var(--border-bright);
  color: var(--text);
  background: rgba(255,255,255,0.04);
}

.btn-primary {
  background: var(--accent-dim);
  border-color: rgba(77,158,240,0.4);
  color: var(--accent);
}
.btn-primary:hover:not(:disabled) {
  background: rgba(77,158,240,0.18);
  border-color: var(--accent);
}

.btn-success {
  background: rgba(74,158,114,0.12);
  border-color: rgba(74,158,114,0.5);
  color: var(--success);
}
.btn-success:hover:not(:disabled) {
  background: rgba(74,158,114,0.22);
  border-color: var(--success);
}

.btn-danger {
  background: rgba(212,84,90,0.1);
  border-color: rgba(212,84,90,0.4);
  color: var(--danger);
}
.btn-danger:hover:not(:disabled) {
  background: rgba(212,84,90,0.2);
  border-color: var(--danger);
}


/* ════════════════════════════════════════
   CONTENT AREA
════════════════════════════════════════ */

.content {
  flex: 1;
  overflow-y: auto;
  padding: 40px 52px;
  scroll-behavior: smooth;
}

/* Welcome */

.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 18px;
  text-align: center;
}

.welcome-saber {
  width: 3px;
  height: 72px;
  background: linear-gradient(to bottom, transparent 0%, var(--accent) 40%, transparent 100%);
  border-radius: 2px;
  box-shadow: 0 0 18px var(--accent), 0 0 36px rgba(77,158,240,0.25);
  animation: welcomeFlicker 3.5s ease-in-out infinite;
}

@keyframes welcomeFlicker {
  0%, 100% { opacity: 1; }
  60%       { opacity: 0.7; }
  65%       { opacity: 1; }
}

.welcome-title {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
}

.welcome-sub {
  font-size: 0.72rem;
  color: var(--text-subtle);
  letter-spacing: 0.06em;
}

/* Loading */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 180px;
  color: var(--text-subtle);
  font-size: 0.78rem;
}

.dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  animation: dotPulse 1.2s ease-in-out infinite;
}
.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotPulse {
  0%, 100% { opacity: 0.2; transform: scale(0.7); }
  50%       { opacity: 1;   transform: scale(1);   }
}


/* ════════════════════════════════════════
   MARKDOWN STYLES
════════════════════════════════════════ */

.md { max-width: 820px; line-height: 1.78; }

.md h1 {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.md h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 38px;
  margin-bottom: 14px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--border);
}

.md h3 {
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 26px;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.md h4 {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--gold);
  margin-top: 18px;
  margin-bottom: 6px;
}

.md p { font-size: 0.9rem; color: var(--text); margin-bottom: 12px; }

.md strong { color: var(--text); font-weight: 600; }
.md em     { color: var(--text-muted); font-style: italic; }

.md a { color: var(--accent); text-decoration: none; }
.md a:hover { text-decoration: underline; }

.md ul, .md ol {
  padding-left: 22px;
  margin-bottom: 12px;
}

.md li { font-size: 0.9rem; color: var(--text); margin-bottom: 5px; }

/* Task list items */
.md li.task-item { list-style: none; margin-left: -6px; }

.md li.task-item input[type="checkbox"] {
  margin-right: 7px;
  cursor: pointer;
  accent-color: var(--accent);
  width: 13px;
  height: 13px;
  transform: translateY(1px);
}

/* Tables */

.md table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
}

.md th {
  background: var(--bg-raised);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 9px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-bright);
}

.md td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
}

.md tr:last-child td { border-bottom: none; }
.md tbody tr:hover td { background: rgba(255,255,255,0.018); }

/* Blockquote */

.md blockquote {
  border-left: 3px solid var(--accent);
  padding: 10px 18px;
  margin: 18px 0;
  background: var(--accent-glow);
  border-radius: 0 var(--r) var(--r) 0;
}

.md blockquote p { color: var(--text-muted); font-style: italic; margin: 0; }

/* Code */

.md code {
  font-family: var(--mono);
  font-size: 0.8rem;
  background: var(--bg-raised);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.md pre {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 18px;
  overflow-x: auto;
  margin: 16px 0;
}

.md pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 0.8rem;
  line-height: 1.65;
}

/* HR */

.md hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 30px 0;
}

/* Badges (README shields) */
.md img { max-width: 100%; display: inline-block; }


/* ════════════════════════════════════════
   EDIT MODE
════════════════════════════════════════ */

.content.edit-mode {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 0;
  overflow: hidden;
  gap: 0;
}

.editor-pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow: hidden;
}

.preview-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pane-header {
  padding: 10px 18px;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-subtle);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.editor-textarea {
  flex: 1;
  background: var(--bg-input);
  color: var(--text);
  border: none;
  outline: none;
  resize: none;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.75;
  padding: 22px 26px;
  tab-size: 2;
  caret-color: var(--accent);
}

.preview-pane-content {
  flex: 1;
  overflow-y: auto;
  padding: 26px 36px;
}

/* Edit topbar password field */

.pwd-inline {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 6px 10px;
  outline: none;
  width: 148px;
  transition: border-color var(--t);
}

.pwd-inline:focus  { border-color: var(--accent); }
.pwd-inline::placeholder { color: var(--text-subtle); }

.pwd-inline.shake {
  border-color: var(--danger);
  animation: shake 300ms ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-5px); }
  60%       { transform: translateX(5px); }
}


/* ════════════════════════════════════════
   PASSWORD MODAL
════════════════════════════════════════ */

.pwd-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 18, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  animation: fadeIn 150ms ease;
}

.pwd-modal-overlay[hidden] { display: none; }

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.pwd-modal {
  background: var(--bg-surface);
  border: 1px solid var(--border-bright);
  border-radius: 8px;
  padding: 28px 32px;
  width: 320px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6), 0 0 0 1px var(--border);
  animation: slideUp 160ms ease;
}

@keyframes slideUp {
  from { transform: translateY(12px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.pwd-modal-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.pwd-modal-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.pwd-modal-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.875rem;
  padding: 9px 12px;
  outline: none;
  margin-bottom: 18px;
  transition: border-color var(--t);
}

.pwd-modal-input:focus { border-color: var(--accent); }
.pwd-modal-input.shake {
  border-color: var(--danger);
  animation: shake 300ms ease;
}

.pwd-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}


/* ════════════════════════════════════════
   TOAST
════════════════════════════════════════ */

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 10px 16px;
  border-radius: var(--r);
  font-size: 0.8rem;
  font-weight: 500;
  z-index: 300;
  pointer-events: none;
  animation: toastIn 200ms ease, toastOut 300ms ease 2600ms forwards;
}

.toast.ok  { background: rgba(74,158,114,0.18); border: 1px solid var(--success); color: var(--success); }
.toast.err { background: rgba(212,84,90,0.16);  border: 1px solid var(--danger);  color: var(--danger);  }
.toast.inf { background: var(--accent-glow);     border: 1px solid rgba(77,158,240,0.4); color: var(--accent); }

@keyframes toastIn  { from { transform: translateY(14px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes toastOut { to   { opacity: 0; } }


/* ════════════════════════════════════════
   SCROLLBARS
════════════════════════════════════════ */

::-webkit-scrollbar        { width: 5px; height: 5px; }
::-webkit-scrollbar-track  { background: transparent; }
::-webkit-scrollbar-thumb  { background: var(--border-bright); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-subtle); }