/* NotesNinja — dark-first product UI */
:root {
  --nn-canvas: #1A1917;
  --nn-surface: #232220;
  --nn-raised: #2A2926;
  --nn-hover: #302F2C;
  --nn-hairline: #3A3935;
  --nn-ink: #E8E6E1;
  --nn-muted: #9B9890;
  --nn-faint: #6B6962;
  --nn-accent: #5645D4;
  --nn-accent-soft: rgba(86, 69, 212, 0.22);
  --nn-link: #7EB6FF;
  --nn-success: #3DCF6A;
  --nn-warning: #E8A33C;
  --nn-error: #E85D5D;
  --nn-sidebar-w: 260px;
  --nn-radius: 8px;
  --nn-radius-lg: 12px;
  --nn-font: "Geist Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Helvetica Neue", sans-serif;
  --nn-mono: "Geist Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;
  --nn-ease: cubic-bezier(0.16, 1, 0.3, 1);
  /* Tag pastels adapted for dark */
  --tag-rose-bg: #3A2A2C; --tag-rose-fg: #F5C2C7;
  --tag-sky-bg: #243340; --tag-sky-fg: #A8D4F0;
  --tag-sage-bg: #2A3329; --tag-sage-fg: #B5D4B0;
  --tag-sand-bg: #3A3426; --tag-sand-fg: #E8D9A8;
  --tag-lilac-bg: #2E2A3A; --tag-lilac-fg: #CDBEF0;
  --tag-peach-bg: #3A2E28; --tag-peach-fg: #F0C4A8;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--nn-font);
  font-size: 14px;
  line-height: 1.5;
  color: var(--nn-ink);
  background: var(--nn-canvas);
  -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--nn-link); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 2px solid var(--nn-accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* Auth */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--nn-canvas);
}
.auth-card {
  width: min(400px, 100%);
  padding: 32px 28px;
  background: var(--nn-surface);
  border: 1px solid var(--nn-hairline);
  border-radius: var(--nn-radius-lg);
}
.auth-logo {
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--nn-muted);
  margin-bottom: 20px;
}
.auth-card h1 {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: -0.03em;
  font-weight: 600;
}
.auth-sub { margin: 0 0 24px; color: var(--nn-muted); font-size: 14px; }
.field { margin-bottom: 14px; }
.field label {
  display: block;
  font-size: 12px;
  color: var(--nn-muted);
  margin-bottom: 6px;
}
.field input {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  background: var(--nn-canvas);
  border: 1px solid var(--nn-hairline);
  border-radius: var(--nn-radius);
  transition: border-color 160ms var(--nn-ease);
}
.field input:focus {
  border-color: var(--nn-accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--nn-accent-soft);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--nn-radius);
  background: var(--nn-raised);
  color: var(--nn-ink);
  cursor: pointer;
  font-weight: 550;
  font-size: 14px;
  transition: background 150ms var(--nn-ease), transform 120ms var(--nn-ease), border-color 150ms var(--nn-ease);
}
.btn:hover { background: var(--nn-hover); }
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--nn-accent);
  color: #fff;
  width: 100%;
  height: 44px;
  margin-top: 8px;
}
.btn-primary:hover { filter: brightness(1.08); background: var(--nn-accent); }
.btn-ghost {
  background: transparent;
  border-color: var(--nn-hairline);
}
.btn-ghost:hover { background: var(--nn-hover); }
.btn-sm { height: 32px; padding: 0 10px; font-size: 13px; }
.btn-danger { color: var(--nn-error); border-color: var(--nn-hairline); }
.auth-switch { margin-top: 20px; text-align: center; color: var(--nn-muted); font-size: 13px; }
.auth-error {
  display: none;
  margin-bottom: 12px;
  padding: 10px 12px;
  background: rgba(232, 93, 93, 0.12);
  border: 1px solid rgba(232, 93, 93, 0.35);
  border-radius: var(--nn-radius);
  color: #f0a0a0;
  font-size: 13px;
}
.auth-error.show { display: block; }
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 72px; }
.pw-toggle {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  background: none; border: 0; color: var(--nn-muted); cursor: pointer; font-size: 12px; padding: 4px 8px;
}

/* App shell */
.app {
  display: grid;
  grid-template-columns: var(--nn-sidebar-w) 1fr;
  min-height: 100vh;
  height: 100vh;
  overflow: hidden;
}
.sidebar {
  background: var(--nn-surface);
  border-right: 1px solid var(--nn-hairline);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-head {
  padding: 16px 14px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.brand {
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 15px;
}
.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 16px;
}
.nav-section {
  margin-top: 12px;
  padding: 0 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--nn-faint);
}
.nav-row {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  height: 34px;
  padding: 0 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--nn-ink);
  cursor: pointer;
  text-align: left;
  font-size: 13.5px;
}
.nav-row:hover { background: var(--nn-hover); }
.nav-row.active { background: var(--nn-raised); }
.nav-row .muted { color: var(--nn-muted); font-size: 12px; margin-left: auto; }
.nav-indent { padding-left: 22px; }
.nav-indent-2 { padding-left: 34px; }
.sidebar-foot {
  border-top: 1px solid var(--nn-hairline);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
  color: var(--nn-muted);
}
.main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--nn-canvas);
}
.topbar {
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  border-bottom: 1px solid var(--nn-hairline);
}
.topbar .crumbs { color: var(--nn-muted); font-size: 13px; flex: 1; min-width: 0; }
.topbar .crumbs strong { color: var(--nn-ink); font-weight: 550; }
.content {
  flex: 1;
  overflow-y: auto;
  padding: 24px 28px 64px;
}

/* Notebook bento */
.page-title {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.035em;
  font-weight: 600;
}
.page-sub { margin: 0 0 24px; color: var(--nn-muted); }
.bento {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.cover-card {
  border: 1px solid var(--nn-hairline);
  border-radius: var(--nn-radius-lg);
  background: var(--nn-raised);
  overflow: hidden;
  cursor: pointer;
  text-align: left;
  padding: 0;
  color: inherit;
  transition: border-color 150ms var(--nn-ease), box-shadow 150ms var(--nn-ease), transform 150ms var(--nn-ease);
}
.cover-card:hover {
  border-color: #4a4842;
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
  transform: translateY(-1px);
}
.cover-thumb {
  aspect-ratio: 16/10;
  background: linear-gradient(145deg, #2e2c38, #252830);
  background-size: cover;
  background-position: center;
}
.cover-meta { padding: 12px 14px 14px; }
.cover-meta h3 {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 550;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cover-meta p { margin: 0; font-size: 12px; color: var(--nn-muted); }
.empty {
  padding: 48px 24px;
  text-align: center;
  color: var(--nn-muted);
  border: 1px dashed var(--nn-hairline);
  border-radius: var(--nn-radius-lg);
}
.empty h3 { color: var(--nn-ink); margin: 0 0 8px; font-size: 16px; }
.empty p { margin: 0 0 16px; font-size: 14px; }

/* Editor */
.editor-wrap {
  max-width: 48rem; /* ~max-w-3xl */
  margin: 0 auto;
  width: 100%;
}
.editor-title {
  width: 100%;
  border: 0;
  background: transparent;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.25;
  padding: 8px 0;
  resize: none;
  outline: none;
}
.editor-title::placeholder { color: var(--nn-faint); }
.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 8px 0 12px;
  border-bottom: 1px solid var(--nn-hairline);
  margin-bottom: 12px;
  position: sticky;
  top: 0;
  background: var(--nn-canvas);
  z-index: 2;
}
.tb-btn {
  height: 30px;
  min-width: 30px;
  padding: 0 8px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--nn-muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.tb-btn:hover { background: var(--nn-hover); color: var(--nn-ink); }
.editor-body {
  min-height: 50vh;
  outline: none;
  font-size: 16px;
  line-height: 1.6;
  color: var(--nn-ink);
}
.editor-body:empty::before {
  content: attr(data-placeholder);
  color: var(--nn-faint);
  pointer-events: none;
}
.editor-body h2 { font-size: 1.35em; letter-spacing: -0.02em; margin: 1.2em 0 0.4em; }
.editor-body h3 { font-size: 1.15em; margin: 1em 0 0.35em; }
.editor-body p { margin: 0.5em 0; }
.editor-body ul, .editor-body ol { padding-left: 1.4em; }
.editor-body blockquote {
  margin: 0.8em 0;
  padding-left: 14px;
  border-left: 3px solid var(--nn-hairline);
  color: var(--nn-muted);
}
.editor-body img {
  border-radius: var(--nn-radius);
  margin: 12px 0;
  max-width: 100%;
}
.editor-body a { color: var(--nn-link); }
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin: 8px 0 4px;
}
.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 500;
  border: 0;
  cursor: default;
}
.tag-rose { background: var(--tag-rose-bg); color: var(--tag-rose-fg); }
.tag-sky { background: var(--tag-sky-bg); color: var(--tag-sky-fg); }
.tag-sage { background: var(--tag-sage-bg); color: var(--tag-sage-fg); }
.tag-sand { background: var(--tag-sand-bg); color: var(--tag-sand-fg); }
.tag-lilac { background: var(--tag-lilac-bg); color: var(--tag-lilac-fg); }
.tag-peach { background: var(--tag-peach-bg); color: var(--tag-peach-fg); }
.tag-input {
  height: 28px;
  min-width: 100px;
  border: 0;
  background: transparent;
  color: var(--nn-muted);
  font-size: 13px;
  outline: none;
}
.save-status { font-size: 12px; color: var(--nn-faint); }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 50; padding: 16px;
}
.modal {
  width: min(440px, 100%);
  background: var(--nn-surface);
  border: 1px solid var(--nn-hairline);
  border-radius: var(--nn-radius-lg);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4);
  padding: 22px 22px 18px;
}
.modal h2 { margin: 0 0 6px; font-size: 17px; letter-spacing: -0.02em; }
.modal p { margin: 0 0 16px; color: var(--nn-muted); font-size: 13px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }
.share-url {
  width: 100%;
  height: 40px;
  padding: 0 10px;
  background: var(--nn-canvas);
  border: 1px solid var(--nn-hairline);
  border-radius: var(--nn-radius);
  font-family: var(--nn-mono);
  font-size: 12px;
  color: var(--nn-ink);
}
.seg {
  display: flex; gap: 4px; margin-bottom: 12px;
}
.seg button {
  flex: 1; height: 36px; border-radius: var(--nn-radius);
  border: 1px solid var(--nn-hairline); background: transparent; cursor: pointer; color: var(--nn-muted);
}
.seg button.on { background: var(--nn-accent-soft); border-color: var(--nn-accent); color: var(--nn-ink); }
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--nn-raised); border: 1px solid var(--nn-hairline);
  padding: 10px 16px; border-radius: var(--nn-radius); font-size: 13px;
  z-index: 60; box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  opacity: 0; pointer-events: none; transition: opacity 180ms var(--nn-ease);
}
.toast.show { opacity: 1; }

.hidden { display: none !important; }
.mobile-toggle { display: none; }

@media (max-width: 800px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; inset: 0 auto 0 0; width: var(--nn-sidebar-w);
    z-index: 40; transform: translateX(-100%); transition: transform 200ms var(--nn-ease);
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-toggle { display: inline-flex; }
  .content { padding: 16px; }
  .editor-title { font-size: 26px; }
}

/* Share public page */
.share-shell { max-width: 48rem; margin: 0 auto; padding: 40px 24px 80px; }
.share-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--nn-muted); margin-bottom: 16px;
  padding: 4px 10px; border: 1px solid var(--nn-hairline); border-radius: 9999px;
}