@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Outfit:wght@500;600;700&display=swap');

:root {
  --bg-color: #f4f6fb;
  --panel-bg: rgba(255, 255, 255, 0.9);
  --panel-solid: #ffffff;
  --panel-border: #e4e8f0;
  --text-primary: #111827;
  --text-secondary: #687386;
  --text-muted: #9aa5b5;
  --accent-color: #1d4ed8;
  --accent-hover: #1d4ed8;
  --accent-bg-subtle: #eff6ff;
  --grid-dot: rgba(148, 163, 184, 0.28);
  --success: #16a34a;
  --danger: #dc2626;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 10px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 22px 50px rgba(15, 23, 42, 0.14);
  --transition: 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Outfit', var(--font-sans);
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  --bg-color: #0b1220;
  --panel-bg: rgba(15, 23, 42, 0.92);
  --panel-solid: #111b2f;
  --panel-border: #24324a;
  --text-primary: #f8fafc;
  --text-secondary: #a9b6ca;
  --text-muted: #6e7e96;
  --accent-color: #2563eb;
  --accent-hover: #93c5fd;
  --accent-bg-subtle: rgba(37, 99, 235, 0.18);
  --grid-dot: rgba(100, 116, 139, 0.24);
  --success: #4ade80;
  --danger: #f87171;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 10px 24px rgba(0, 0, 0, 0.24);
  --shadow-lg: 0 22px 50px rgba(0, 0, 0, 0.36);
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  background: var(--bg-color);
  color: var(--text-primary);
  display: flex;
  font-size: 16px;
  font-family: var(--font-sans);
  transition: background-color var(--transition), color var(--transition);
}

button,
input,
textarea,
select { font: inherit; font-size: 14px; }

button { -webkit-tap-highlight-color: transparent; }

.app-container {
  display: flex;
  height: 100vh;
  min-width: 0;
  overflow: hidden;
  width: 100%;
}

.left-toolbar {
  align-items: center;
  background: var(--panel-bg);
  border-right: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  gap: 12px;
  height: 100%;
  padding: 16px 0;
  width: 58px;
  z-index: 10;
}

.toolbar-section {
  align-items: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.toolbar-spacer { margin-top: auto; }

.toolbar-divider {
  background: var(--panel-border);
  height: 1px;
  width: 26px;
}

.logo-icon {
  align-items: center;
  background: linear-gradient(135deg, #0f172a, #0ea5e9);
  border-radius: 11px;
  box-shadow: 0 8px 16px rgba(14, 165, 233, 0.25);
  color: #fff;
  display: flex;
  height: 36px;
  justify-content: center;
  width: 36px;
}

.logo-icon svg { height: 21px; width: 21px; }

.tool-btn {
  align-items: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 9px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  height: 38px;
  justify-content: center;
  padding: 0;
  position: relative;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  width: 38px;
}

.tool-btn svg { height: 19px; width: 19px; }
.tool-btn:hover { background: var(--accent-bg-subtle); color: var(--accent-color); transform: translateY(-1px); }

[data-tooltip]::after {
  background: var(--text-primary);
  border-radius: 6px;
  color: var(--bg-color);
  content: attr(data-tooltip);
  font-family: var(--font-mono);
  font-size: 12px;
  left: calc(100% + 10px);
  opacity: 0;
  padding: 6px 8px;
  pointer-events: none;
  position: absolute;
  top: 50%;
  transform: translate(-4px, -50%);
  transition: opacity var(--transition), transform var(--transition);
  white-space: nowrap;
  z-index: 120;
}

[data-tooltip]:hover::after { opacity: 1; transform: translate(0, -50%); }

.canvas-container {
  display: flex;
  flex: 1 1 auto;
  height: 100%;
  min-width: 0;
  overflow: hidden;
  position: relative;
}

.canvas-bg {
  background-color: var(--bg-color);
  background-image: radial-gradient(var(--grid-dot) 1.2px, transparent 1.2px);
  background-size: 24px 24px;
  inset: 0;
  position: absolute;
  z-index: 0;
}

.canvas-viewport {
  align-items: center;
  display: flex;
  inset: 0;
  justify-content: center;
  overflow: auto;
  padding: 84px 32px 88px;
  position: absolute;
  z-index: 1;
}

.preview-shell { max-width: 680px; width: min(100%, 680px); }

.preview-card {
  backdrop-filter: blur(14px);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 26px;
  box-shadow: var(--shadow-lg);
  padding: 24px;
}

.preview-kicker {
  align-items: center;
  color: var(--text-secondary);
  display: flex;
  font-family: var(--font-mono);
  font-size: 12px;
  gap: 7px;
  letter-spacing: 0.06em;
  margin: 0 auto 18px;
  text-transform: uppercase;
  width: fit-content;
}

.status-dot {
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--success) 14%, transparent);
  height: 7px;
  width: 7px;
}

.qr-frame {
  align-items: center;
  background: var(--panel-solid);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  display: flex;
  justify-content: center;
  min-height: 280px;
  overflow: hidden;
  padding: 22px;
  position: relative;
}

#qr-canvas {
  background: #fff;
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.12);
  display: block;
  height: auto;
  image-rendering: pixelated;
  max-height: min(58vh, 520px);
  max-width: 100%;
  width: auto;
}

.empty-state {
  align-items: center;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}

.empty-state[hidden] { display: none; }
.empty-icon { color: var(--accent-color); font-size: 46px; line-height: 1; }
.empty-state strong { color: var(--text-primary); font-size: 14px; }
.empty-state span { font-size: 12px; }

.hud-status-bar {
  align-items: center;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 9px;
  bottom: 18px;
  box-shadow: var(--shadow-sm);
  color: var(--text-secondary);
  display: flex;
  font-family: var(--font-mono);
  font-size: 12px;
  gap: 10px;
  left: 50%;
  padding: 8px 12px;
  position: absolute;
  transform: translateX(-50%);
  white-space: nowrap;
  z-index: 4;
}

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

.nav-pill {
  align-items: center;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  box-shadow: var(--shadow-md);
  display: flex;
  gap: 7px;
  left: 50%;
  opacity: 0.92;
  padding: 6px 8px 6px 13px;
  pointer-events: auto;
  position: absolute;
  top: 14px;
  transform: translateX(-50%);
  transition: opacity var(--transition);
  z-index: 5;
}

.nav-pill:hover { opacity: 1; }
.nav-pill-label { color: var(--text-secondary); font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; white-space: nowrap; }
.nav-pill-btn { align-items: center; border: 0; border-radius: 20px; cursor: pointer; display: inline-flex; font-size: 12px; font-weight: 600; gap: 5px; padding: 6px 10px; white-space: nowrap; }
.nav-pill-btn svg { height: 13px; width: 13px; }
.nav-pill-btn.back-hub { background: var(--accent-bg-subtle); color: var(--text-primary); }
.nav-pill-btn.open-standalone { background: var(--accent-color); color: #fff; }

.mobile-toggle-btn {
  align-items: center;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  color: var(--text-primary);
  cursor: pointer;
  display: none;
  height: 44px;
  justify-content: center;
  position: absolute;
  top: 16px;
  width: 44px;
  z-index: 20;
}

.mobile-toggle-btn.left-toggle { left: 16px; }
.mobile-toggle-btn.right-toggle { right: 16px; }
.sidebar-overlay { background: rgba(15, 23, 42, 0.34); display: none; inset: 0; position: absolute; z-index: 90; }

.right-sidebar {
  background: var(--panel-bg);
  border-left: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  height: 100%;
  overflow: hidden;
  width: 338px;
  z-index: 10;
}

.sidebar-tabs { border-bottom: 1px solid var(--panel-border); display: flex; overflow-x: auto; padding: 0 12px; scrollbar-width: thin; }
.tab-btn { background: transparent; border: 0; border-bottom: 2px solid transparent; color: var(--text-secondary); cursor: pointer; flex: 1 0 auto; font-family: var(--font-mono); font-size: 12px; font-weight: 600; min-height: 52px; padding: 0 11px; text-transform: uppercase; transition: color var(--transition), border-color var(--transition); }
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { border-bottom-color: var(--accent-color); color: var(--text-primary); }

.sidebar-tab-content { display: none; flex: 1 1 auto; min-height: 0; overflow-y: auto; padding: 22px 20px 28px; }
.sidebar-tab-content.active { display: block; }
.sidebar-tab-content[hidden] { display: none; }
.input-group { border-bottom: 1px solid var(--panel-border); margin-bottom: 21px; padding-bottom: 20px; }
.input-group:last-of-type { border-bottom: 0; margin-bottom: 0; }
.input-section-title { color: var(--text-secondary); font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: 0.1em; margin-bottom: 15px; text-transform: uppercase; }
.input-field-wrapper { margin-bottom: 14px; }
.input-field-wrapper label, .color-field-row label { color: var(--text-secondary); display: block; font-size: 12px; font-weight: 500; margin-bottom: 7px; }
.text-input { background: var(--panel-solid); border: 1px solid var(--panel-border); border-radius: 8px; color: var(--text-primary); outline: none; padding: 10px 11px; transition: border-color var(--transition), box-shadow var(--transition); width: 100%; }
.text-input:focus { border-color: var(--accent-color); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-color) 15%, transparent); }
.payload-input { line-height: 1.5; min-height: 126px; resize: vertical; }
.field-hint { color: var(--text-muted); font-family: var(--font-mono); font-size: 12px; line-height: 1.5; margin-top: 6px; }

.preset-row { display: flex; flex-wrap: wrap; gap: 7px; }
.preset-chip { background: var(--accent-bg-subtle); border: 1px solid transparent; border-radius: 999px; color: var(--accent-color); cursor: pointer; font-size: 12px; font-weight: 600; padding: 7px 10px; transition: border-color var(--transition), transform var(--transition); }
.preset-chip:hover { border-color: color-mix(in srgb, var(--accent-color) 35%, transparent); transform: translateY(-1px); }

.segmented-control { background: var(--accent-bg-subtle); border: 1px solid var(--panel-border); border-radius: 9px; display: grid; grid-template-columns: repeat(4, 1fr); overflow: hidden; }
.segmented-control label { cursor: pointer; margin: 0; position: relative; }
.segmented-control input { height: 1px; opacity: 0; position: absolute; width: 1px; }
.segmented-control span { align-items: center; color: var(--text-secondary); display: flex; font-family: var(--font-mono); font-size: 12px; font-weight: 600; height: 38px; justify-content: center; }
.segmented-control input:checked + span { background: var(--accent-color); color: #fff; }

.primary-action, .action-btn { align-items: center; border-radius: 8px; cursor: pointer; display: flex; font-size: 12px; font-weight: 600; justify-content: center; min-height: 42px; padding: 10px 12px; transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition); width: 100%; }
.primary-action { background: var(--accent-color); border: 1px solid var(--accent-color); color: #fff; }
.primary-action:hover { background: var(--accent-hover); border-color: var(--accent-hover); transform: translateY(-1px); }
.action-btn.secondary { background: transparent; border: 1px solid var(--panel-border); color: var(--text-primary); }
.action-btn.secondary:hover { background: var(--accent-bg-subtle); border-color: var(--accent-color); color: var(--accent-color); }
.error-message { background: color-mix(in srgb, var(--danger) 10%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 28%, transparent); border-radius: 8px; color: var(--danger); font-size: 12px; line-height: 1.45; margin-top: 12px; padding: 9px 10px; }
.error-message[hidden] { display: none; }

.two-column-fields { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.color-field-row { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; margin-bottom: 14px; }
.color-field-row label { align-items: center; background: var(--panel-solid); border: 1px solid var(--panel-border); border-radius: 8px; display: flex; justify-content: space-between; margin: 0; padding: 7px 8px 7px 10px; }
.color-field-row input[type="color"] { background: transparent; border: 0; cursor: pointer; height: 30px; padding: 0; width: 34px; }
.export-grid { display: grid; gap: 9px; grid-template-columns: 1fr 1fr; }
.privacy-note { color: var(--text-muted); font-size: 12px; line-height: 1.5; margin: 18px 0 0; }
.privacy-note span { color: var(--accent-color); margin-right: 4px; }

.app-toast { background: var(--text-primary); border-radius: 999px; bottom: 70px; box-shadow: var(--shadow-lg); color: var(--bg-color); font-size: 12px; left: 50%; opacity: 0; padding: 10px 16px; pointer-events: none; position: fixed; transform: translate(-50%, 20px); transition: opacity var(--transition), transform var(--transition); z-index: 200; }
.app-toast.visible { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 768px) {
  .mobile-toggle-btn { display: flex; }
  .left-toolbar { height: 100vh; }
  .canvas-viewport { align-items: flex-start; padding: 76px 16px 84px; }
  .preview-card { border-radius: 20px; padding: 16px; }
  .preview-kicker { font-size: 12px; margin-bottom: 13px; }
  .qr-frame { min-height: 0; padding: 14px; }
  #qr-canvas { max-height: 58vh; max-width: 100%; }
  .nav-pill { left: auto; padding: 5px 7px; right: 10px; transform: none; }
  .nav-pill-label { display: none; }
  .hud-status-bar { bottom: 12px; font-size: 12px; max-width: calc(100vw - 32px); overflow: hidden; }
  .right-sidebar { height: 100vh; max-height: 100vh; max-width: min(90vw, 360px); }
  .sidebar-tab-content { padding: 18px 16px 26px; }
  .export-grid { grid-template-columns: 1fr; }
}