/* PlateMint — Dark theme, clean typography, generous whitespace */

:root {
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-surface-hover: #1c2a4a;
  --color-border: #2a3a5c;
  --color-text: #e8e8e8;
  --color-text-muted: #9a9ab0;
  --color-accent: #4fc3f7;
  --color-accent-hover: #81d4fa;
  --color-primary: #4fc3f7;
  --color-primary-hover: #81d4fa;
  --color-secondary: #7c4dff;
  --color-secondary-hover: #b388ff;
  --color-danger: #ef5350;
  --color-link: #80cbc4;
  --color-link-hover: #b2dfdb;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Menlo,
    Courier, monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --max-width: 1100px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App container */
#app {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
}

/* Header */
header {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg) 0;
  text-align: center;
}

.header-logo-link {
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.header-logo {
  max-width: 100%;
  width: 360px;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

/* Breadcrumb */
.breadcrumb,
#breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.breadcrumb li::after,
#breadcrumb li::after {
  content: "/";
  margin-left: var(--space-sm);
  color: var(--color-border);
}

.breadcrumb li:last-child::after,
#breadcrumb li:last-child::after {
  content: "";
}

.breadcrumb a,
#breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

.breadcrumb a:hover,
#breadcrumb a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.breadcrumb li:last-child,
#breadcrumb li:last-child {
  color: var(--color-text);
  font-weight: 500;
}

/* Intro section */
.intro {
  text-align: center;
  margin-bottom: var(--space-md);
  padding: var(--space-md) 0;
}

.intro h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.intro-tagline {
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.intro-description {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.5;
}

.step-heading {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

/* State grid */
.state-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
}

/* State card */
.state-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease,
    transform 0.15s ease;
}

.state-card:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.state-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.state-card h2,
.state-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.state-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.state-card .state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-sm);
  display: block;
  object-fit: contain;
  transition: transform 0.15s ease;
}

.state-card:hover .state-icon {
  transform: scale(1.1);
}

/* Layout list */
.layout-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg) 0;
}

/* Layout item */
.layout-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.layout-item:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-accent);
}

.layout-item:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.layout-item svg {
  flex-shrink: 0;
  max-width: 180px;
  height: auto;
  border-radius: var(--radius-sm);
}

.layout-item .layout-info {
  flex: 1;
}

.layout-item .layout-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.layout-item .layout-info p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Preview area */
.preview-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
  padding: var(--space-2xl) 0;
  width: 100%;
}

.preview-area svg {
  max-width: 100%;
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius-md);
  background: #fff;
  padding: var(--space-sm);
}

/* Preview panel — visible container for the live plate preview */
.preview-panel {
  width: 100%;
  max-width: 640px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.preview-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preview-plate {
  width: 100%;
  display: flex;
  justify-content: center;
  min-height: 80px;
  transition: opacity 0.2s ease;
}

.preview-plate.preview-placeholder {
  opacity: 0.45;
}

/* Input group */
.input-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
}

/* Disabled button state */
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* Text input */
.text-input {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-md) var(--space-lg);
  width: 100%;
  max-width: 400px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-align: center;
  transition: border-color 0.15s ease;
}

.text-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.text-input::placeholder {
  color: var(--color-text-muted);
  text-transform: none;
  letter-spacing: normal;
  font-size: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
  text-decoration: none;
  line-height: 1.4;
}

.btn:active {
  transform: scale(0.97);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
}

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

/* Button group */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

/* Footer */
footer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

footer p {
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

footer ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
}

footer a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Headings */
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }

  .state-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-md);
  }

  .state-card {
    padding: var(--space-lg);
  }

  .layout-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .layout-item svg {
    max-width: 100%;
  }

  .text-input {
    font-size: 1.25rem;
    max-width: 100%;
  }

  footer ul {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .state-grid {
    grid-template-columns: 1fr 1fr;
  }

  h1 {
    font-size: 1.375rem;
  }

  .btn {
    width: 100%;
  }

  .btn-group {
    flex-direction: column;
  }
}