/* ============================================
   Simple Type Playground
   ============================================ */

:root {
  --bg-deep: #0b0c10;
  --bg-panel: #14161d;
  --bg-panel-soft: #191c24;
  --bg-control: #101219;
  --paper: #f6f8fb;
  --paper-line: #d8deea;
  --ink: #141821;
  --text-primary: #eef2f6;
  --text-secondary: #9aa5b5;
  --text-muted: #657082;
  --accent-primary: #34d6c3;
  --accent-bright: #b8f36a;
  --accent-warm: #ffb25f;
  --accent-coral: #ff6f61;
  --border-color: rgba(255, 255, 255, 0.08);
  --focus-ring: 0 0 0 3px rgba(52, 214, 195, 0.28);
  --font-display: 'Instrument Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Space Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

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

html {
  font-size: 16px;
}

body {
  min-height: 100vh;
  font-family: var(--font-display);
  color: var(--text-primary);
  background:
    linear-gradient(rgba(52, 214, 195, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 178, 95, 0.035) 1px, transparent 1px),
    var(--bg-deep);
  background-size: 56px 56px;
  line-height: 1.5;
  overflow-x: hidden;
}

button,
textarea,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.texture-overlay {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  z-index: 10;
}

.header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 32px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(11, 12, 16, 0.76);
  backdrop-filter: blur(16px);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent-primary);
}

.back-link svg {
  transition: transform 0.2s;
}

.back-link:hover svg {
  transform: translateX(-3px);
}

.header-title {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-title h1 {
  font-size: 20px;
  font-weight: 650;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 4px 10px;
  border: 1px solid rgba(52, 214, 195, 0.24);
  border-radius: 4px;
  color: var(--accent-primary);
  background: rgba(52, 214, 195, 0.08);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.main {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px;
}

.type-lab {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.control-panel,
.preview-panel {
  min-width: 0;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: rgba(20, 22, 29, 0.92);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

.control-panel {
  padding: 20px;
}

.panel-section + .panel-section {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--border-color);
}

.section-kicker {
  display: block;
  margin-bottom: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.font-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.font-option {
  min-height: 74px;
  display: grid;
  gap: 6px;
  justify-items: start;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  background: var(--bg-control);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.font-option:hover {
  border-color: rgba(52, 214, 195, 0.36);
  background: #151923;
}

.font-option:focus-visible,
.ghost-button:focus-visible,
.primary-button:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.font-option.is-active {
  border-color: var(--accent-primary);
  background: rgba(52, 214, 195, 0.12);
}

.font-name {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
}

.font-sample {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
}

.font-option[data-font="serif"] .font-sample {
  font-family: Georgia, 'Times New Roman', serif;
}

.font-option[data-font="mono"] .font-sample {
  font-family: var(--font-mono);
}

.font-option[data-font="display"] .font-sample {
  font-family: 'Trebuchet MS', 'Gill Sans', system-ui, sans-serif;
}

textarea {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  padding: 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  background: var(--bg-control);
  line-height: 1.55;
}

.control-stack {
  display: grid;
  gap: 18px;
}

.range-control {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
  align-items: center;
  color: var(--text-secondary);
  font-size: 13px;
}

.range-control strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.range-control input {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent-primary);
}

.switch-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.switch-control {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  background: var(--bg-control);
  font-size: 13px;
}

.switch-control input {
  position: absolute;
  opacity: 0;
}

.switch-track {
  position: relative;
  width: 34px;
  height: 20px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: #2a303c;
  transition: background 0.2s;
}

.switch-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: transform 0.2s, background 0.2s;
}

.switch-control input:checked + .switch-track {
  background: rgba(52, 214, 195, 0.34);
}

.switch-control input:checked + .switch-track::after {
  transform: translateX(14px);
  background: var(--accent-primary);
}

.switch-control:has(input:focus-visible) {
  box-shadow: var(--focus-ring);
}

.action-row {
  display: flex;
  gap: 10px;
  margin-top: 22px;
}

.ghost-button,
.primary-button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  border-radius: 8px;
  font-weight: 700;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

.ghost-button {
  flex: 1;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: transparent;
}

.primary-button {
  flex: 1.4;
  border: 1px solid rgba(52, 214, 195, 0.36);
  color: #07110f;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-bright));
}

.ghost-button:hover,
.primary-button:hover {
  transform: translateY(-1px);
}

.preview-panel {
  min-height: 720px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.preview-toolbar {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
}

.specimen-frame {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  background:
    linear-gradient(90deg, rgba(52, 214, 195, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(255, 178, 95, 0.05) 1px, transparent 1px),
    #11141b;
  background-size: 24px 24px;
}

.specimen-paper {
  min-width: 0;
  width: 100%;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 52px;
  border-radius: 8px;
  background:
    linear-gradient(var(--paper-line) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 34px;
  box-shadow:
    0 22px 70px rgba(0, 0, 0, 0.38),
    inset 0 0 0 1px rgba(20, 24, 33, 0.08);
}

.preview-text {
  width: 100%;
  min-width: 0;
  max-width: 54ch;
  color: var(--ink);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.output-panel {
  min-width: 0;
  border-top: 1px solid var(--border-color);
  background: var(--bg-panel-soft);
}

.output-head {
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 18px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

#copyStatus {
  color: var(--accent-warm);
  text-transform: none;
}

pre {
  max-height: 180px;
  overflow: auto;
  padding: 0 18px 18px;
  color: #cfe6df;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

@media (max-width: 980px) {
  .type-lab {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    min-height: 620px;
  }
}

@media (max-width: 640px) {
  .header {
    align-items: flex-start;
    flex-direction: column;
    padding: 20px;
  }

  .main {
    padding: 20px;
  }

  .control-panel {
    padding: 16px;
  }

  .font-options,
  .switch-row {
    grid-template-columns: 1fr;
  }

  .specimen-frame {
    padding: 18px;
  }

  .specimen-paper {
    min-height: 360px;
    padding: 28px;
  }

  .preview-text {
    font-size: 32px;
  }

  .preview-toolbar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 12px 16px;
  }
}