/* ============================================================
   Inkwell — design tokens
   ============================================================ */
:root {
  --font-ui: 'Geist', system-ui, -apple-system, 'Segoe UI', 'Noto Sans TC', sans-serif;
  --font-serif: 'Source Serif 4', 'Fraunces', 'Noto Serif TC', Georgia, serif;
  --font-display: 'Fraunces', 'Source Serif 4', Georgia, serif;
  --font-mono: 'Geist Mono', 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.08);
  --shadow: 0 8px 24px rgba(0,0,0,.12);
  --shadow-lg: 0 24px 64px rgba(0,0,0,.24);

  --easing: cubic-bezier(.2,.7,.2,1);
  --dur: 220ms;
}

/* dark (default) */
:root, [data-theme="dark"] {
  --bg: #0f0f10;
  --bg-elev: #161618;
  --surface: #1c1c1f;
  --surface-2: #232327;
  --border: #2a2a2e;
  --border-strong: #3a3a40;
  --text: #e8e4da;
  --text-2: #a09b91;
  --text-3: #6a665d;
  --accent: #d17a4c;
  --accent-2: #e69a72;
  --danger: #d9534e;
  --success: #5fb88c;
  --hl: rgba(209,122,76,.14);
  --selection: rgba(209,122,76,.32);
  --scrim: rgba(0,0,0,.55);
  --noise-opacity: .035;
}

[data-theme="light"] {
  --bg: #faf8f3;
  --bg-elev: #f4f1e9;
  --surface: #ffffff;
  --surface-2: #f2efe8;
  --border: #e5e0d5;
  --border-strong: #cfc8b8;
  --text: #1a1816;
  --text-2: #5a554d;
  --text-3: #8e8a82;
  --accent: #b5562d;
  --accent-2: #9a4622;
  --danger: #b8453f;
  --success: #4a8c6a;
  --hl: rgba(181,86,45,.10);
  --selection: rgba(181,86,45,.24);
  --scrim: rgba(20,16,10,.40);
  --noise-opacity: .025;
}

/* ============================================================
   reset & base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow: hidden;
  overscroll-behavior: none;
}
::selection { background: var(--selection); }

button, input, textarea, select {
  font: inherit;
  color: inherit;
}
button { background: none; border: none; cursor: pointer; padding: 0; }
input, textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .55rem .7rem;
  color: var(--text);
  width: 100%;
  transition: border-color var(--dur) var(--easing), background var(--dur);
}
input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.hidden { display: none !important; }
.muted { color: var(--text-2); }
.small { font-size: 12px; }
.serif { font-family: var(--font-display); font-weight: 500; letter-spacing: -.01em; }
.serif.italic { font-style: italic; }

code, kbd { font-family: var(--font-mono); font-size: .9em; }

/* ============================================================
   landing
   ============================================================ */
.landing {
  position: fixed; inset: 0;
  display: flex; flex-direction: column;
  background: var(--bg);
  overflow: auto;
}
.landing-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(800px 400px at 12% -10%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%),
    radial-gradient(900px 500px at 110% 110%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 60%);
  pointer-events: none;
}
.landing-bg::after {
  content: "";
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .35 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: var(--noise-opacity);
  mix-blend-mode: overlay;
}
.landing-nav {
  position: relative; z-index: 1;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.25rem clamp(1rem, 5vw, 3rem);
}
.brand {
  display: flex; align-items: center; gap: .5rem;
  font-family: var(--font-display);
  font-size: 1.15rem; font-weight: 600;
  letter-spacing: -.01em;
}
.brand-mark { font-size: 1.4rem; color: var(--accent); transform: translateY(-1px); }

.landing-hero {
  position: relative; z-index: 1;
  flex: 1;
  display: flex; flex-direction: column; justify-content: center;
  padding: 2rem clamp(1rem, 5vw, 3rem);
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0 0 1.25rem;
  font-variation-settings: 'opsz' 96;
}
.hero-title em {
  color: var(--accent);
  font-weight: 500;
}
.hero-sub {
  font-size: clamp(1rem, 1.7vw, 1.15rem);
  color: var(--text-2);
  max-width: 580px;
  line-height: 1.6;
  margin: 0 0 2rem;
}
.hero-actions {
  display: flex; flex-wrap: wrap; gap: .75rem;
  margin-bottom: 3rem;
}
.hero-features {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: .75rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  max-width: 900px;
}
.hero-features li {
  position: relative;
  padding: .85rem 1rem .85rem 2rem;
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-2);
  font-size: .92rem;
}
.hero-features li::before {
  content: "✒︎";
  position: absolute; left: .7rem; top: .85rem;
  color: var(--accent);
  font-size: .85rem;
}
.hero-features strong { color: var(--text); font-weight: 500; }
.landing-foot {
  position: relative; z-index: 1;
  padding: 1.5rem clamp(1rem, 5vw, 3rem);
  color: var(--text-3);
  font-size: .8rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

/* ============================================================
   buttons
   ============================================================ */
.primary-btn, .ghost-btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .65rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: .9rem;
  transition: all var(--dur) var(--easing);
  white-space: nowrap;
}
.primary-btn {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255,255,255,.15) inset, var(--shadow-sm);
}
.primary-btn:hover { background: var(--accent-2); transform: translateY(-1px); box-shadow: var(--shadow); }
.primary-btn:active { transform: translateY(0); }
.ghost-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.ghost-btn:hover { background: var(--surface); border-color: var(--border-strong); }
.ghost-btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.ghost-btn.danger:hover { background: color-mix(in srgb, var(--danger) 10%, transparent); }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  transition: all var(--dur) var(--easing);
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn:active { transform: scale(.95); }

.link {
  background: none; border: none; padding: 0;
  color: var(--accent); text-decoration: underline; cursor: pointer;
  font: inherit;
}

/* ============================================================
   app layout
   ============================================================ */
.app {
  position: fixed; inset: 0;
  display: grid;
  grid-template-columns: 280px 1fr;
  overflow: hidden;
}
.sidebar {
  position: relative;
  display: flex; flex-direction: column;
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  min-width: 0;
  z-index: 5;
}
.sidebar-head {
  display: flex; align-items: center; gap: .4rem;
  padding: .65rem .75rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-close { display: none; }
.vault-switcher {
  flex: 1;
  display: flex; align-items: center; gap: .5rem;
  padding: .45rem .6rem;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 500;
  text-align: left;
  min-width: 0;
  transition: background var(--dur);
}
.vault-switcher:hover { background: var(--surface-2); }
.vault-switcher span {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: .92rem;
}
.vault-switcher .caret { color: var(--text-3); }

.sidebar-toolbar {
  display: flex; align-items: center; gap: .25rem;
  padding: .5rem .5rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-toolbar .spacer { flex: 1; }
.filter-input {
  width: 110px;
  padding: .3rem .5rem;
  font-size: .82rem;
  background: var(--surface);
  border: 1px solid var(--border);
}

.file-tree {
  flex: 1; overflow: auto;
  padding: .4rem 0;
}
.tree-empty {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-3);
  font-size: .85rem;
}
.tree-item {
  display: flex; align-items: center; gap: .35rem;
  padding: .3rem .6rem .3rem .5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  margin: 1px .35rem;
  color: var(--text-2);
  font-size: .88rem;
  user-select: none;
  transition: background var(--dur);
}
.tree-item:hover { background: var(--surface-2); color: var(--text); }
.tree-item.active {
  background: var(--hl);
  color: var(--text);
}
.tree-item.active .tree-name { color: var(--accent); }
.tree-item .tree-caret {
  width: 14px; display: inline-flex; justify-content: center;
  transition: transform var(--dur);
  color: var(--text-3);
}
.tree-item.expanded .tree-caret { transform: rotate(90deg); }
.tree-item .tree-icon { display: inline-flex; color: var(--text-3); flex-shrink: 0; }
.tree-item.active .tree-icon { color: var(--accent); }
.tree-item .tree-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-children {
  margin-left: 1rem;
  border-left: 1px solid var(--border);
  padding-left: .1rem;
}

.sidebar-foot {
  display: flex; align-items: center; gap: .25rem;
  padding: .5rem .6rem;
  border-top: 1px solid var(--border);
}
.sidebar-foot .user-chip {
  margin-left: auto;
  cursor: pointer;
}
.user-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: .75rem; font-weight: 600;
  overflow: hidden;
}
.user-avatar img { width: 100%; height: 100%; object-fit: cover; }
.user-avatar.large { width: 48px; height: 48px; font-size: 1.1rem; }

/* ============================================================
   main / topbar / editor shell
   ============================================================ */
.main {
  display: flex; flex-direction: column;
  min-width: 0; min-height: 0;
}
.topbar {
  display: flex; align-items: center; gap: .5rem;
  padding: .5rem .75rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  min-height: 48px;
}
.mobile-only { display: none; }
.breadcrumb {
  flex: 1; min-width: 0;
  font-size: .88rem;
  color: var(--text-2);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  display: flex; align-items: center; gap: .4rem;
}
.breadcrumb .crumb-sep { color: var(--text-3); }
.breadcrumb .crumb-name { color: var(--text); font-weight: 500; }
.topbar-actions { display: flex; align-items: center; gap: .25rem; }
.save-status {
  font-size: .75rem;
  color: var(--text-3);
  margin-right: .5rem;
  white-space: nowrap;
}
.save-status.saving { color: var(--text-2); }
.save-status.saved { color: var(--success); }
.save-status.error { color: var(--danger); }

.editor-shell {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
  position: relative;
}
.editor-shell.no-preview { grid-template-columns: 1fr; }
.editor-shell.preview-only { grid-template-columns: 1fr; }
.editor-shell.preview-only .editor-pane { display: none; }
.editor-shell.no-preview .preview-pane { display: none; }

.editor-pane {
  position: relative;
  display: flex;
  min-height: 0;
  overflow: hidden;
  background: var(--bg);
}
.preview-pane {
  background: var(--bg);
  border-left: 1px solid var(--border);
  overflow: auto;
  padding: 2rem clamp(1rem, 4vw, 3rem);
}

.editor-empty {
  margin: auto;
  text-align: center;
  color: var(--text-2);
  padding: 2rem;
}
.editor-empty h2 { margin: .5rem 0 .75rem; font-size: 1.6rem; color: var(--text); }
.editor-empty .empty-mark {
  font-family: var(--font-display);
  font-size: 4rem;
  color: var(--accent);
  opacity: .6;
}

/* ============================================================
   modals
   ============================================================ */
.modal {
  position: fixed; inset: 0;
  background: var(--scrim);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
  padding: 1rem;
  animation: fade-in var(--dur) var(--easing);
}
@keyframes fade-in { from { opacity: 0; } }
.modal-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: min(560px, 100%);
  max-height: 90vh;
  display: flex; flex-direction: column;
  overflow: hidden;
  animation: slide-up var(--dur) var(--easing);
}
.modal-card.narrow { width: min(440px, 100%); }
@keyframes slide-up { from { transform: translateY(20px); opacity: 0; } }
.modal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.modal-head h3 { margin: 0; font-size: 1.1rem; }
.modal > .modal-card > section,
.modal > .modal-card > .browser-list,
.modal > .modal-card > .vault-list,
.modal > .modal-card > p,
.modal > .modal-card > .field,
.modal > .modal-card > .modal-actions,
.modal > .modal-card > .breadcrumb { padding-left: 1.25rem; padding-right: 1.25rem; }
.settings-panel { padding: 1.25rem; overflow: auto; }

.settings-tabs {
  display: flex; gap: .25rem;
  padding: .5rem 1rem 0;
  border-bottom: 1px solid var(--border);
}
.settings-tabs .tab {
  padding: .55rem .9rem;
  font-size: .88rem;
  color: var(--text-2);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--dur);
}
.settings-tabs .tab:hover { color: var(--text); }
.settings-tabs .tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.field {
  margin-bottom: 1.1rem;
}
.field label {
  display: block;
  font-size: .78rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: .35rem;
  letter-spacing: .02em;
  text-transform: uppercase;
}
.field .hint {
  margin: .35rem 0 0;
  color: var(--text-3);
  font-size: .78rem;
}
.field .hint code {
  padding: 1px 5px;
  background: var(--surface-2);
  border-radius: 3px;
  font-size: .75rem;
}
.path-row { display: flex; gap: .4rem; }
.path-row input { flex: 1; }

.seg {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
  flex-wrap: wrap;
}
.seg-opt {
  padding: .4rem .75rem;
  font-size: .82rem;
  color: var(--text-2);
  border-radius: 4px;
  transition: all var(--dur);
}
.seg-opt:hover { color: var(--text); }
.seg-opt.active {
  background: var(--accent);
  color: #fff;
}

.modal-actions {
  display: flex; gap: .5rem; justify-content: flex-end;
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.test-result {
  padding: 0 1.25rem 1rem;
  font-size: .85rem;
}
.test-result.ok { color: var(--success); }
.test-result.err { color: var(--danger); }

.account-card {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.account-name { font-weight: 600; }

.browser-list, .vault-list {
  max-height: 50vh;
  overflow: auto;
  padding-bottom: .5rem;
}
.browser-item, .vault-item {
  display: flex; align-items: center; gap: .6rem;
  padding: .65rem .8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--dur);
  margin: 2px 0;
}
.browser-item:hover, .vault-item:hover { background: var(--surface-2); }
.browser-item .ico, .vault-item .ico {
  color: var(--accent);
  width: 20px;
  display: inline-flex;
}
.vault-item {
  border: 1px solid var(--border);
  margin-bottom: .5rem;
  padding: 1rem;
}
.vault-item .vault-meta {
  font-size: .8rem;
  color: var(--text-3);
}
.browser-loading {
  text-align: center; color: var(--text-3); padding: 2rem;
}
#browser-crumb {
  display: flex; flex-wrap: wrap; gap: .25rem;
  padding: .75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  font-size: .85rem;
  color: var(--text-2);
}
#browser-crumb button {
  color: var(--accent);
  text-decoration: none;
  padding: 2px 6px;
  border-radius: 4px;
}
#browser-crumb button:hover { background: var(--surface-2); }

/* ============================================================
   toast
   ============================================================ */
.toast {
  position: fixed; bottom: 1.5rem; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: .65rem 1.1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-size: .88rem;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all var(--dur) var(--easing);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: var(--danger); color: #fff; }
.toast.ok { background: var(--success); color: #fff; }

/* ============================================================
   scrim (mobile sidebar overlay)
   ============================================================ */
.scrim {
  position: fixed; inset: 0;
  background: var(--scrim);
  z-index: 4;
  animation: fade-in var(--dur);
}

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 900px) {
  .preview-pane { display: none; }
  .editor-shell { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; inset: 0 auto 0 0;
    width: min(320px, 86vw);
    transform: translateX(-100%);
    transition: transform var(--dur) var(--easing);
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-close { display: inline-flex; }
  .mobile-only { display: inline-flex; }
  .topbar { padding: .5rem; }
  .preview-pane { padding: 1.25rem; }
  .hero-title { font-size: clamp(2.2rem, 9vw, 3.5rem); }
}
@media (min-width: 721px) {
  .scrim { display: none !important; }
}

/* ============================================================
   utilities
   ============================================================ */
.hint code { color: var(--accent); }