/* ============================================================
   Document Converter Suite — Design System
   Aesthetic: Linear/Notion tool-app · warm minimal · Helvetica
   ============================================================ */

:root {
  /* Light theme tokens */
  --bg: #fafaf8;
  --bg-elev: #ffffff;
  --bg-sunken: #f3f2ee;
  --bg-overlay: rgba(20,20,18,0.04);
  --ink: #1a1a18;
  --ink-2: #4a4a45;
  --ink-3: #8a8a82;
  --ink-4: #b8b6ad;
  --line: #e6e4dd;
  --line-strong: #d4d1c8;
  --accent: oklch(0.62 0.13 145);
  --accent-soft: oklch(0.95 0.04 145);
  --accent-ink: oklch(0.32 0.08 145);
  --warn: oklch(0.7 0.14 65);
  --warn-soft: oklch(0.96 0.04 80);
  --warn-ink: oklch(0.4 0.1 60);
  --danger: oklch(0.6 0.16 30);
  --danger-soft: oklch(0.96 0.03 30);
  --info: oklch(0.62 0.12 250);
  --info-soft: oklch(0.96 0.03 250);
  --shadow-sm: 0 1px 0 rgba(20,20,18,0.04), 0 1px 2px rgba(20,20,18,0.04);
  --shadow-md: 0 1px 0 rgba(20,20,18,0.04), 0 4px 12px -2px rgba(20,20,18,0.08);
  --shadow-lg: 0 8px 30px -6px rgba(20,20,18,0.12);

  /* Tool accent hues — each tool gets one */
  --hue-cli: 145;        /* sage green */
  --hue-chat: 320;       /* magenta-pink */
  --hue-pdf-md: 28;      /* warm orange (PDF red) */
  --hue-pdf-xlsx: 158;   /* teal-green (excel green) */
  --hue-docx: 232;       /* word blue */
  --hue-xlsx-pdf: 105;   /* yellow-green */
  --hue-md-html: 268;    /* purple */
  --hue-ocr: 195;        /* cyan */
  --hue-ai-md: 50;       /* amber-gold (AI) */

  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --font-ui: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --font-serif: "Charter", "Iowan Old Style", Georgia, serif;

  --header-h: 56px;
  --sidebar-w: 240px;
}

[data-theme="dark"] {
  --bg: #15140f;
  --bg-elev: #1c1b15;
  --bg-sunken: #24221b;
  --bg-overlay: rgba(255,255,250,0.04);
  --ink: #f1efe6;
  --ink-2: #c6c3b6;
  --ink-3: #8a8779;
  --ink-4: #5a574b;
  --line: #2c2a22;
  --line-strong: #3d3a30;
  --accent: oklch(0.7 0.14 145);
  --accent-soft: oklch(0.28 0.05 145);
  --accent-ink: oklch(0.85 0.1 145);
  --warn: oklch(0.78 0.14 70);
  --warn-soft: oklch(0.28 0.05 70);
  --warn-ink: oklch(0.85 0.1 70);
  --danger: oklch(0.7 0.16 30);
  --danger-soft: oklch(0.3 0.05 30);
  --info: oklch(0.72 0.12 250);
  --info-soft: oklch(0.28 0.05 250);
  --shadow-sm: 0 1px 0 rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 1px 0 rgba(0,0,0,0.3), 0 4px 12px -2px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px -6px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }

html, body, #root {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 200ms ease, color 200ms ease;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  padding: 0;
}

a { color: inherit; text-decoration: none; }

/* ============================================================
   APP SHELL
   ============================================================ */

.app {
  display: grid;
  grid-template-rows: var(--header-h) 1fr;
  height: 100vh;
  min-height: 0;
}

.top {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  cursor: pointer;
  padding: 6px 8px 6px 0;
  margin-right: 4px;
  border-radius: var(--radius-sm);
}
.brand:hover .brand-text-main { color: var(--accent-ink); }
.brand-mark {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--bg);
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-weight: 700; font-size: 12px;
  letter-spacing: -0.02em;
  position: relative;
  overflow: hidden;
}
.brand-mark::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.08) 50%);
}
.brand-text-main {
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: -0.005em;
  transition: color 120ms ease;
}
.brand-text-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-3);
  margin-top: 1px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-3);
  flex: 1;
  min-width: 0;
}
.crumbs .sep {
  color: var(--ink-4);
}
.crumbs .crumb {
  color: var(--ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.crumbs .crumb.current {
  color: var(--ink);
  font-weight: 500;
}
.crumbs a.crumb:hover { color: var(--ink); }

.top-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  color: var(--ink-2);
  border: 1px solid transparent;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.icon-btn:hover {
  background: var(--bg-sunken);
  color: var(--ink);
}
.icon-btn.active {
  background: var(--bg-sunken);
  border-color: var(--line);
  color: var(--ink);
}
.icon-btn svg { width: 16px; height: 16px; display: block; }

.lang-toggle {
  height: 32px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  transition: background 120ms ease;
}
.lang-toggle:hover { background: var(--bg-sunken); color: var(--ink); }

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: -0.005em;
  color: var(--ink);
  background: transparent;
  border: 1px solid transparent;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, transform 80ms ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(0.5px); }
.btn-ghost {
  border-color: var(--line);
  background: var(--bg-elev);
}
.btn-ghost:hover {
  background: var(--bg-sunken);
  border-color: var(--line-strong);
}
.btn-ghost.is-active {
  background: var(--accent-soft);
  border-color: var(--accent-soft);
  color: var(--accent-ink);
}
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover { background: #000; }
[data-theme="dark"] .btn-primary:hover { background: var(--ink); filter: brightness(1.1); }
.btn-danger-ghost {
  border-color: var(--line);
  background: var(--bg-elev);
  color: var(--danger);
}
.btn-danger-ghost:hover {
  background: var(--danger-soft);
  border-color: var(--danger);
}

.btn .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.seg {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-elev);
}
.seg-btn {
  height: 32px;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
  background: transparent;
  border-right: 1px solid var(--line);
}
.seg-btn:last-child { border-right: none; }
.seg-btn:hover { background: var(--bg-sunken); color: var(--ink); }
.seg-btn.active {
  background: var(--ink);
  color: var(--bg);
}

/* ============================================================
   HUB
   ============================================================ */

.hub {
  height: 100%;
  overflow: auto;
  background: var(--bg);
}

.hub-hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 32px 28px;
}
.hub-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  margin-bottom: 18px;
}
.hub-title {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 14px;
  color: var(--ink);
}
.hub-title em {
  font-style: normal;
  background: linear-gradient(120deg, var(--accent) 0%, oklch(0.62 0.13 200) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hub-sub {
  font-size: 16px;
  color: var(--ink-2);
  max-width: 640px;
  line-height: 1.55;
  margin: 0;
}

.hub-toolbar {
  max-width: 1100px;
  margin: 24px auto 0;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hub-search {
  flex: 1;
  position: relative;
}
.hub-search svg {
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--ink-3);
  width: 15px; height: 15px;
}
.hub-search input {
  width: 100%;
  height: 38px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: var(--radius);
  padding: 0 14px 0 36px;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--ink);
  outline: none;
  transition: border-color 120ms ease, background 120ms ease;
}
.hub-search input:focus {
  border-color: var(--ink-3);
  background: var(--bg);
}
.hub-search input::placeholder { color: var(--ink-3); }

.hub-section {
  max-width: 1100px;
  margin: 36px auto 0;
  padding: 0 32px 48px;
}
.hub-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
}
.hub-section-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.hub-section-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

/* Tool card */
.tool-card {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 156px;
  overflow: hidden;
}
.tool-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.tool-card:hover .tool-card-arrow {
  transform: translateX(2px);
  opacity: 1;
}

.tool-card-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: oklch(0.95 0.04 var(--card-hue, 145));
  color: oklch(0.4 0.12 var(--card-hue, 145));
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: -0.02em;
  position: relative;
}
[data-theme="dark"] .tool-card-icon {
  background: oklch(0.28 0.05 var(--card-hue, 145));
  color: oklch(0.85 0.1 var(--card-hue, 145));
}

.tool-card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin: 0;
}
.tool-card-desc {
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.5;
  margin: 0;
  flex: 1;
}
.tool-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}
.tool-card-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 7px;
  border-radius: 4px;
  background: var(--bg-sunken);
  color: var(--ink-3);
  font-weight: 600;
}
.tool-card-badge.live {
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.tool-card-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-3);
  transition: transform 160ms ease, opacity 160ms ease;
  opacity: 0.6;
}

/* Card variations (Tweaks) */
.tool-card.style-flat {
  border-radius: var(--radius);
  padding: 18px;
}
.tool-card.style-flat .tool-card-icon {
  background: transparent;
  border: 1px solid currentColor;
  width: 36px; height: 36px;
  font-size: 11px;
}

.tool-card.style-tinted {
  background: oklch(0.97 0.03 var(--card-hue, 145));
  border-color: oklch(0.92 0.04 var(--card-hue, 145));
}
[data-theme="dark"] .tool-card.style-tinted {
  background: oklch(0.22 0.04 var(--card-hue, 145));
  border-color: oklch(0.3 0.05 var(--card-hue, 145));
}

.tool-card.style-bold .tool-card-icon {
  background: oklch(0.55 0.16 var(--card-hue, 145));
  color: white;
}
.tool-card.style-bold {
  border-color: var(--line);
}

/* History card */
.hist-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hist-row {
  display: grid;
  grid-template-columns: 28px 1fr auto auto;
  align-items: center;
  gap: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 100ms ease;
}
.hist-row:hover { background: var(--bg-sunken); }
.hist-icon {
  width: 28px; height: 28px;
  border-radius: 6px;
  display: grid; place-items: center;
  background: oklch(0.95 0.04 var(--card-hue, 145));
  color: oklch(0.4 0.12 var(--card-hue, 145));
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
}
[data-theme="dark"] .hist-icon {
  background: oklch(0.28 0.05 var(--card-hue, 145));
  color: oklch(0.85 0.1 var(--card-hue, 145));
}
.hist-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.hist-name small {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--ink-3);
  margin-left: 8px;
  font-size: 11px;
}
.hist-tool {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.hist-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-4);
}
.hist-empty {
  font-size: 13px;
  color: var(--ink-3);
  padding: 24px 14px;
  text-align: center;
  background: var(--bg-sunken);
  border-radius: var(--radius);
  border: 1px dashed var(--line-strong);
}

/* ============================================================
   TOOL PAGES
   ============================================================ */

.tool {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  height: 100%;
  min-height: 0;
  background: var(--bg);
}

.tool-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 24px 14px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
}
.tool-head-icon {
  width: 38px; height: 38px;
  border-radius: 9px;
  display: grid; place-items: center;
  background: oklch(0.95 0.04 var(--card-hue, 145));
  color: oklch(0.4 0.12 var(--card-hue, 145));
  font-family: var(--font-mono);
  font-weight: 700; font-size: 12px;
  letter-spacing: -0.02em;
}
[data-theme="dark"] .tool-head-icon {
  background: oklch(0.28 0.05 var(--card-hue, 145));
  color: oklch(0.85 0.1 var(--card-hue, 145));
}
.tool-head-title { font-size: 16px; font-weight: 600; letter-spacing: -0.005em; }
.tool-head-sub { font-size: 12px; color: var(--ink-3); margin-top: 2px; }
.tool-head-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-opts {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 24px;
  background: var(--bg-sunken);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.opt {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; color: var(--ink-2);
  user-select: none;
}
.opt input[type="checkbox"] { accent-color: var(--ink); width: 14px; height: 14px; }
.opt-label { font-weight: 500; color: var(--ink); }
.opt-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
}
.opt-divider {
  width: 1px; align-self: stretch;
  background: var(--line);
  margin: 0 2px;
}
.opt-radio { gap: 10px; }
.radio-group {
  display: inline-flex;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: 6px;
  overflow: hidden;
}
.radio-pill {
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-2);
  background: transparent;
  border-right: 1px solid var(--line);
}
.radio-pill:last-child { border-right: none; }
.radio-pill:hover { background: var(--bg-sunken); color: var(--ink); }
.radio-pill.active { background: var(--ink); color: var(--bg); }

/* ============================================================
   SPLIT / STACK LAYOUTS
   ============================================================ */

.split {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  min-height: 0;
}
.split.vertical {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr 1px 1fr;
}
.split.vertical .divider {
  width: 100%;
  height: 1px;
}
.divider { background: var(--line); }

.pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.pane-input { background: var(--bg-elev); }
.pane-output { background: var(--bg); }

.pane-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
}
.pane-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-2);
}
.pane-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
}

.editor {
  flex: 1;
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink);
  background: transparent;
  tab-size: 4;
}
.editor::placeholder { color: var(--ink-3); }

.md-source {
  flex: 1;
  margin: 0;
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink);
  background: transparent;
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}
.md-source .placeholder { color: var(--ink-3); }

.preview {
  flex: 1;
  padding: 22px 26px;
  overflow: auto;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
}
.preview h1, .preview h2, .preview h3, .preview h4 {
  font-weight: 600; letter-spacing: -0.01em;
  margin: 1.4em 0 0.5em;
}
.preview h1 { font-size: 1.6em; }
.preview h2 { font-size: 1.3em; border-bottom: 1px solid var(--line); padding-bottom: 0.3em; }
.preview h3 { font-size: 1.1em; }
.preview p { margin: 0.6em 0; }
.preview ul, .preview ol { padding-left: 1.4em; margin: 0.4em 0; }
.preview li { margin: 0.15em 0; }
.preview a { color: var(--accent-ink); text-decoration: underline; text-decoration-color: var(--line-strong); }
.preview blockquote {
  margin: 0.8em 0;
  padding: 0.2em 1em;
  border-left: 3px solid var(--accent);
  color: var(--ink-2);
  background: var(--bg-sunken);
  border-radius: 0 6px 6px 0;
}
.preview code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-sunken);
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--line);
}
.preview pre {
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  overflow: auto;
  margin: 0.8em 0;
}
.preview pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: 12.5px;
  line-height: 1.55;
}
.preview table {
  border-collapse: collapse;
  margin: 0.8em 0;
  width: 100%;
  font-size: 13px;
}
.preview th, .preview td {
  border: 1px solid var(--line);
  padding: 6px 12px;
  text-align: left;
}
.preview th { background: var(--bg-sunken); font-weight: 600; }
.preview tr:nth-child(even) td { background: var(--bg-overlay); }
.preview hr { border: none; border-top: 1px solid var(--line); margin: 1.6em 0; }
.preview img { max-width: 100%; }

/* ============================================================
   DROPZONE
   ============================================================ */

.dropzone {
  flex: 1;
  margin: 18px;
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  gap: 14px;
  transition: background 160ms ease, border-color 160ms ease;
  cursor: pointer;
  text-align: center;
  min-height: 240px;
  position: relative;
  overflow: hidden;
}
.dropzone:hover {
  background: var(--bg-sunken);
  border-color: var(--ink-4);
}
.dropzone.dragover {
  background: var(--accent-soft);
  border-color: var(--accent);
  border-style: solid;
}
.dropzone-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--bg-sunken);
  display: grid; place-items: center;
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 14px; font-weight: 700;
  letter-spacing: -0.02em;
}
.dropzone.dragover .dropzone-icon {
  background: var(--bg-elev);
  color: var(--accent-ink);
}
.dropzone-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.dropzone-sub {
  font-size: 12.5px;
  color: var(--ink-3);
  margin-top: 2px;
  max-width: 380px;
}
.dropzone-files {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* Dropzone styles (Tweaks) */
.dropzone.style-minimal {
  border-style: solid;
  border-width: 1px;
  background: var(--bg-sunken);
}
.dropzone.style-minimal .dropzone-icon {
  background: var(--bg-elev);
  border: 1px solid var(--line);
}

.dropzone.style-grid {
  background-image: repeating-linear-gradient(0deg, var(--line) 0 1px, transparent 1px 24px),
                    repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 24px);
  background-color: var(--bg-elev);
}
.dropzone.style-grid.dragover {
  background-color: var(--accent-soft);
}

.dropzone.style-blueprint {
  background: oklch(0.32 0.07 220);
  border-color: oklch(0.55 0.12 220);
  color: oklch(0.92 0.05 220);
  background-image:
    repeating-linear-gradient(0deg, oklch(0.4 0.06 220) 0 1px, transparent 1px 20px),
    repeating-linear-gradient(90deg, oklch(0.4 0.06 220) 0 1px, transparent 1px 20px);
}
.dropzone.style-blueprint .dropzone-title,
.dropzone.style-blueprint .dropzone-sub,
.dropzone.style-blueprint .dropzone-files { color: oklch(0.92 0.05 220); }
.dropzone.style-blueprint .dropzone-icon {
  background: oklch(0.42 0.08 220);
  color: oklch(0.95 0.05 220);
}

/* File list inside dropzone */
.file-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 540px;
}
.file-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px 5px 8px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  color: var(--ink);
  font-family: var(--font-mono);
}
.file-chip .x {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg-sunken);
  color: var(--ink-3);
  display: grid; place-items: center;
  font-size: 10px;
  cursor: pointer;
  margin-left: 4px;
}
.file-chip .x:hover { background: var(--danger-soft); color: var(--danger); }

/* ============================================================
   STATUS BAR
   ============================================================ */

.statusbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: var(--bg-elev);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  height: 32px;
}
.stat b { color: var(--ink); font-weight: 600; }
.stat-sep { color: var(--line-strong); }
.status-spacer { flex: 1; }
.status-pill {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}
.status-pill.ok { color: var(--accent-ink); background: var(--accent-soft); }
.status-pill.busy { color: var(--warn-ink); background: var(--warn-soft); }
.status-pill.err { color: var(--danger); background: var(--danger-soft); }

/* ============================================================
   EMPTY STATES / PLACEHOLDERS
   ============================================================ */

.placeholder-pane {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  padding: 32px;
  text-align: center;
  color: var(--ink-3);
}
.placeholder-pane .ph-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-2);
}
.placeholder-pane .ph-sub {
  font-size: 12.5px;
  max-width: 360px;
  line-height: 1.5;
}

/* ============================================================
   SCROLLBARS
   ============================================================ */
.editor::-webkit-scrollbar,
.md-source::-webkit-scrollbar,
.preview::-webkit-scrollbar,
.hub::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
.editor::-webkit-scrollbar-thumb,
.md-source::-webkit-scrollbar-thumb,
.preview::-webkit-scrollbar-thumb,
.hub::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 10px;
  border: 2px solid var(--bg);
}

/* ============================================================
   TWEAKS PANEL overrides (work with starter)
   ============================================================ */

#tweaks-fab {
  background: var(--ink) !important;
  color: var(--bg) !important;
  border-radius: 999px !important;
}

/* ============================================================
   SPINNER
   ============================================================ */

.spin {
  width: 14px; height: 14px;
  border: 2px solid var(--line);
  border-top-color: var(--ink);
  border-radius: 50%;
  display: inline-block;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
   TABLE PREVIEW (Excel-ish)
   ============================================================ */

.sheet-tabs {
  display: flex;
  gap: 4px;
  padding: 8px 18px 0;
  background: var(--bg-sunken);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.sheet-tab {
  padding: 6px 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  border-radius: 6px 6px 0 0;
  color: var(--ink-3);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  white-space: nowrap;
  cursor: pointer;
}
.sheet-tab.active {
  background: var(--bg-elev);
  color: var(--ink);
  border-color: var(--line);
}
.sheet-table-wrap {
  flex: 1;
  overflow: auto;
  background: var(--bg-elev);
}
.sheet-table {
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
  min-width: 100%;
}
.sheet-table th, .sheet-table td {
  border: 1px solid var(--line);
  padding: 4px 8px;
  white-space: nowrap;
  color: var(--ink);
}
.sheet-table th {
  background: var(--bg-sunken);
  font-weight: 600;
  text-align: left;
  position: sticky;
  top: 0;
}
.sheet-table tr:hover td { background: var(--bg-overlay); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px) {
  .hub-title { font-size: 28px; }
  .split { grid-template-columns: 1fr; grid-template-rows: 1fr 1px 1fr; }
  .split .divider { height: 1px; width: 100%; }
  .brand-text { display: none; }
  .top { padding: 0 12px; gap: 8px; }
  .hub-hero, .hub-section, .hub-toolbar { padding-left: 18px; padding-right: 18px; }
}

/* ---------------------------- AI → Markdown ---------------------------- */

.ai-cursor {
  display: inline-block;
  width: 7px; height: 1.05em;
  margin-left: 1px;
  vertical-align: text-bottom;
  background: var(--accent);
  border-radius: 1px;
  animation: ai-blink 1s steps(2, start) infinite;
}
@keyframes ai-blink { to { visibility: hidden; } }

.ai-usage {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 1px 8px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--bg-sunken);
  color: var(--ink-3); font-size: 11px;
}

.ai-extra-input, .ai-continue-input {
  flex: 1; min-width: 150px; height: 30px; padding: 0 10px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-elev); color: var(--ink); font: inherit; font-size: 12px;
}
.ai-extra-input:focus, .ai-continue-input:focus { outline: none; border-color: var(--line-strong); }

.ai-provider-select {
  height: 30px; padding: 0 8px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-elev); color: var(--ink-2); font: inherit; font-size: 12px; cursor: pointer;
}

.ai-continue-row {
  display: flex; gap: 8px; padding: 10px 18px;
  border-top: 1px solid var(--line); background: var(--bg-elev);
}

.ai-error {
  margin: 0; padding: 14px 18px; color: var(--ink-2);
  font-size: 13px; line-height: 1.6; white-space: pre-wrap;
}
.ai-error b { color: var(--ink); }

/* Settings modal */
.ai-modal-backdrop {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(20,20,18,0.45);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.ai-modal {
  width: min(560px, 100%); max-height: 88vh; overflow: auto;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: 20px 22px;
}
.ai-modal h3 { margin: 0 0 4px; font-size: 16px; color: var(--ink); }
.ai-modal-note {
  margin: 8px 0 16px; padding: 8px 12px; border-radius: var(--radius-sm);
  background: var(--bg-sunken); border: 1px solid var(--line);
  color: var(--ink-3); font-size: 11.5px; line-height: 1.5;
}
.ai-tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.ai-tab {
  height: 30px; padding: 0 12px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--bg-elev);
  color: var(--ink-2); font: inherit; font-size: 12px; cursor: pointer;
}
.ai-tab.active { background: var(--accent-soft); color: var(--accent-ink); border-color: var(--accent); }
.ai-field { margin-bottom: 12px; }
.ai-field > label {
  display: block; margin-bottom: 4px; font-size: 11px; color: var(--ink-3);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.ai-field input {
  width: 100%; height: 32px; padding: 0 10px; box-sizing: border-box;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-elev); color: var(--ink); font: inherit; font-size: 13px;
}
.ai-field input:focus { outline: none; border-color: var(--line-strong); }
.ai-field-na { font-size: 11px; color: var(--ink-3); margin-top: 4px; }
.ai-modal-actions {
  display: flex; align-items: center; gap: 8px;
  margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line);
}
.ai-modal-spacer { flex: 1; }
.ai-test-result { font-size: 12px; }
.ai-test-result.ok { color: var(--accent-ink); }
.ai-test-result.fail { color: #c0392b; }