/* ============================================================
   TechTown Design System — QR Code Generator
   Source of truth: ~/.claude/skills/techtown-brand-guidelines/
   ============================================================ */

:root {
  /* ── Brand colors ─────────────────────────────────────── */
  --color-primary: #1c63ed;
  --color-primary-dark: #1557d6;

  /* Text */
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-text-white: #ffffff;

  /* Backgrounds */
  --color-background: #ffffff;
  --color-background-alt: #f9fafb;

  /* Borders */
  --color-border: #e5e7eb;

  /* Semantic — danger / error */
  --color-danger: #dc2626;
  --color-danger-dark: #b91c1c;
  --color-danger-bg: #fee2e2;
  --color-danger-text: #991b1b;
  --color-danger-border: #fecaca;

  /* Toggle off state */
  --color-toggle-off: #cbd5e1;

  /* ── Typography ───────────────────────────────────────── */
  --font-family: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  /* ── Spacing ──────────────────────────────────────────── */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* ── Layout ───────────────────────────────────────────── */
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

/* ============================================================
   Base
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

body {
  font-family: var(--font-family);
  background: var(--color-background-alt);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   App header
   ============================================================ */

.app-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-background);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.app-brand .brand-logo {
  height: 28px;
  width: auto;
  display: block;
}

.app-nav {
  display: flex;
  gap: var(--spacing-md);
  margin-right: auto;
}

.app-nav-link {
  text-decoration: none;
  color: var(--color-text-light);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.app-nav-link:hover {
  color: var(--color-primary);
}

.app-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.app-user #user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.app-user img {
  border-radius: 50%;
}

#user-name {
  font-size: 0.875rem;
  color: var(--color-text);
}

.banner-error {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
  padding: var(--spacing-sm) var(--spacing-lg);
  text-align: center;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--color-danger-border);
}

/* ============================================================
   Page header / hero
   ============================================================ */

.page-header {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
}

.page-header .brand-logo {
  height: 32px;
  width: auto;
  margin-bottom: var(--spacing-md);
  display: inline-block;
}

header h1 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.4;
}

header p {
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-lg);
}

footer {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-2xl);
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

footer a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color 0.2s ease;
}

footer a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ============================================================
   App layout
   ============================================================ */

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg) var(--spacing-2xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.panel {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg);
}

.preview-panel {
  position: sticky;
  top: var(--spacing-lg);
}

.section {
  margin-bottom: var(--spacing-lg);
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

/* ============================================================
   Inputs
   ============================================================ */

input[type="text"],
input[type="url"],
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--color-background);
  color: var(--color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="url"]:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(from var(--color-primary) r g b / 0.15);
}

.url-row {
  display: flex;
  gap: var(--spacing-xs);
}

.url-row input {
  flex: 1;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-text-white);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease, color 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
  display: inline-block;
  line-height: 1.4;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-text-white);
}

.btn-danger {
  background: var(--color-danger);
  color: var(--color-text-white);
  border: 2px solid transparent;
}

.btn-danger:hover {
  background: var(--color-danger-dark);
}

/* ============================================================
   Color row + color picker
   ============================================================ */

.color-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.color-row:last-child {
  margin-bottom: 0;
}

.color-row label {
  margin-bottom: 0;
  flex: 1;
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 40px;
  height: 40px;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  padding: 2px;
  background: var(--color-background);
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 5px;
}

/* ============================================================
   Toggle switch
   ============================================================ */

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.toggle-row label {
  margin-bottom: 0;
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--color-toggle-off);
  border-radius: 24px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.toggle-slider::before {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: var(--color-background);
  border-radius: 50%;
  transition: transform 0.2s ease;
}

.toggle input:checked + .toggle-slider {
  background: var(--color-primary);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

.gradient-options {
  display: none;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
}

.gradient-options.visible {
  display: block;
}

/* ============================================================
   Sliders
   ============================================================ */

.slider-row {
  margin-bottom: var(--spacing-sm);
}

.slider-row:last-child {
  margin-bottom: 0;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
}

.slider-value {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-weight: var(--font-weight-medium);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 1px 4px rgb(0 0 0 / 0.2);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 1px 4px rgb(0 0 0 / 0.2);
}

/* ============================================================
   Shape grid (modules / eyes)
   ============================================================ */

.shape-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-xs);
}

.shape-option {
  text-align: center;
  padding: var(--spacing-sm) var(--spacing-xs);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
  user-select: none;
  color: var(--color-text);
}

.shape-option:hover {
  border-color: var(--color-primary);
}

.shape-option.active {
  border-color: var(--color-primary);
  background: rgb(from var(--color-primary) r g b / 0.08);
  color: var(--color-primary);
}

.shape-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

/* ============================================================
   File upload (logo)
   ============================================================ */

.file-upload {
  position: relative;
}

.file-upload input[type="file"] {
  display: none;
}

.file-upload-label {
  display: block;
  padding: var(--spacing-sm);
  border: 2px dashed var(--color-border);
  border-radius: var(--border-radius);
  text-align: center;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--color-text-light);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.file-upload-label:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.logo-preview-row {
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
  padding: var(--spacing-xs);
  background: var(--color-background-alt);
  border-radius: var(--border-radius);
}

.logo-preview-row.visible {
  display: flex;
}

.logo-thumb {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 4px;
}

.logo-filename {
  flex: 1;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.checkbox-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
}

.checkbox-row label {
  margin-bottom: 0;
  font-size: 0.875rem;
}

/* ============================================================
   Preview panel
   ============================================================ */

#qr-preview {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 320px;
  background: var(--color-background-alt);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
}

#qr-preview canvas,
#qr-preview svg {
  border-radius: 4px;
}

.download-row {
  display: flex;
  gap: var(--spacing-xs);
}

.download-row .btn {
  flex: 1;
}

.placeholder-text {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* ============================================================
   Save block (index page)
   ============================================================ */

.save-block {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--color-background-alt);
  border-radius: var(--border-radius);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.save-block small {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.save-block #name-input {
  font-size: 0.875rem;
  padding: var(--spacing-xs) var(--spacing-sm);
}

/* ============================================================
   Dashboard
   ============================================================ */

.dashboard {
  max-width: 960px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-lg) var(--spacing-2xl);
}

.dashboard-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.dashboard-head h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.qr-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--spacing-md);
}

.qr-card {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.qr-card:hover,
.qr-card:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  outline: none;
}

.qr-card-preview {
  flex: 0 0 96px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-card-preview canvas,
.qr-card-preview svg {
  max-width: 96px;
  max-height: 96px;
}

.qr-card-body {
  flex: 1;
  min-width: 0;
}

.qr-card-title {
  font-weight: var(--font-weight-semibold);
  font-size: 0.9375rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
  color: var(--color-text);
}

.qr-card-target {
  color: var(--color-text-light);
  font-size: 0.8125rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.qr-card-meta {
  color: var(--color-text-light);
  font-size: 0.8125rem;
}

.qr-detail {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.qr-detail h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.qr-detail input[type="url"],
.qr-detail input[type="text"] {
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  color: var(--color-text-light);
  font-size: 0.8125rem;
  margin: var(--spacing-md) 0;
}

.detail-meta code {
  background: var(--color-background-alt);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Menlo, Monaco, monospace;
}

.detail-actions {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  color: var(--color-text-light);
}

.empty-state .btn {
  margin-top: var(--spacing-md);
  display: inline-block;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    position: static;
    order: -1;
  }

  .shape-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .dashboard {
    padding: 0 var(--spacing-md) var(--spacing-xl);
  }
}