:root {
  --bg: #f7f7f5;
  --bg-elevated: #ffffff;
  --text: #1c1c1a;
  --text-muted: #6b6b64;
  --border: #dedad2;
  --accent: #3a6b52;
  --accent-text: #ffffff;
  --danger: #a3392f;
  --code-bg: #eeece5;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17181a;
    --bg-elevated: #1f2123;
    --text: #e8e6e1;
    --text-muted: #9a9890;
    --border: #34363a;
    --accent: #6fbf96;
    --accent-text: #10241a;
    --danger: #e07a6d;
    --code-bg: #26282b;
  }
}

:root[data-theme="dark"] {
  --bg: #17181a;
  --bg-elevated: #1f2123;
  --text: #e8e6e1;
  --text-muted: #9a9890;
  --border: #34363a;
  --accent: #6fbf96;
  --accent-text: #10241a;
  --danger: #e07a6d;
  --code-bg: #26282b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

.topbar {
  background: var(--bg-elevated);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.05);
}

.nav {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav a { color: var(--text); text-decoration: none; transition: color 0.15s ease; }
.nav a:hover { color: var(--accent); }
.nav .spacer { flex: 1; }
.nav .who { color: var(--text-muted); }

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  line-height: 1.1;
}
.brand-logo {
  width: 30px;
  height: 30px;
  border-radius: 7px;
}
.brand-name {
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.02em;
}

.login-logo {
  display: block;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  margin: 0 auto 0.75rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

button, .btn {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  text-decoration: none;
  display: inline-block;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}

button:hover, .btn:hover { border-color: var(--accent); color: var(--accent); }
button:active, .btn:active { transform: translateY(1px); }

button[type="submit"], .btn.primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  box-shadow: 0 2px 6px color-mix(in srgb, var(--accent) 35%, transparent);
}
button[type="submit"]:hover, .btn.primary:hover {
  color: var(--accent-text);
  filter: brightness(1.08);
}

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

.nav-btn {
  background: none;
  border: none;
  color: var(--text);
  padding: 0.45rem 0.2rem;
  font: inherit;
  cursor: pointer;
  transition: color 0.15s ease;
}
.nav-btn:hover { color: var(--accent); }

.inline-form { display: inline-block; margin: 0; }

.icon-btn {
  border-radius: 999px;
  width: 2.2rem;
  height: 2.2rem;
  padding: 0;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#theme-toggle .icon-moon { display: none; }

:root[data-theme="dark"] #theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] #theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) #theme-toggle .icon-sun { display: none; }
  :root:not([data-theme="light"]) #theme-toggle .icon-moon { display: block; }
}

.stack { display: flex; flex-direction: column; gap: 0.4rem; max-width: 480px; }
.stack.form-wide { max-width: none; }
.stack label { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.5rem; }
.stack input, textarea {
  font: inherit;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.stack input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
.stack button { margin-top: 0.75rem; align-self: flex-start; }

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.page-head h1 { margin-bottom: 0.25rem; }
.page-head .actions { display: flex; gap: 0.5rem; }

.note-list { list-style: none; padding: 0; margin: 1rem 0; }
.note-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 0.9rem;
  margin-bottom: 0.4rem;
  border-radius: 8px;
  flex-wrap: wrap;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
}
.note-row:hover {
  background: var(--bg-elevated);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}
.note-title { font-weight: 600; color: var(--text); text-decoration: none; }
.note-title:hover { color: var(--accent); }
.note-meta { color: var(--text-muted); font-size: 0.85rem; }

.badge {
  background: var(--accent);
  color: var(--accent-text);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  font-size: 0.75rem;
  margin-left: 0.4rem;
}

.muted { color: var(--text-muted); }

.flash {
  padding: 0.6rem 0.9rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  border-left: 3px solid currentColor;
  animation: flash-in 0.2s ease;
}
.flash-error { background: color-mix(in srgb, var(--danger) 15%, transparent); color: var(--danger); }
.flash-notice { background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); }

@keyframes flash-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .flash { animation: none; }
}

.center-card {
  max-width: 360px;
  margin: 3rem auto 0;
  text-align: center;
}
.center-card h1 { margin-top: 0; }
.center-card .stack { text-align: left; }

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem 1.25rem;
  margin: 1.25rem 0;
  background: var(--bg-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 14px rgba(0, 0, 0, 0.05);
}

#title { max-width: 640px; }

.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.editor-toolbar label { margin-top: 0; }
.image-upload-btn { padding: 0.3rem 0.7rem; font-size: 0.85rem; }
.image-hint { font-size: 0.8rem; }
.image-upload-status {
  font-size: 0.8rem;
  color: var(--accent);
  transition: color 0.15s ease;
}
.image-upload-status.is-error { color: var(--danger); }

.editor-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
  min-height: 65vh;
}
.editor-split textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  resize: vertical;
  height: 100%;
  min-height: 65vh;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.editor-split textarea.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
.preview-pane {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  overflow-y: auto;
  background: var(--bg-elevated);
  min-height: 65vh;
}

@media (max-width: 700px) {
  .editor-split { grid-template-columns: 1fr; }
}

.rendered-markdown { max-width: 100%; overflow-wrap: break-word; }
.rendered-markdown pre {
  background: var(--code-bg);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  overflow-x: auto;
}
.rendered-markdown code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.rendered-markdown pre code { background: none; padding: 0; }
.rendered-markdown blockquote {
  margin: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--border);
  color: var(--text-muted);
}
.rendered-markdown img { max-width: 100%; }
.rendered-markdown table { border-collapse: collapse; }
.rendered-markdown th, .rendered-markdown td {
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
}

.site-footer {
  text-align: center;
  padding: 1.5rem 1rem 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }