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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans JP", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #f0f2f5;
}

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: white;
  padding: 1.25rem 1rem;
  text-align: center;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.site-logo {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

header h1 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
}

.subtitle {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-top: 0.3rem;
}

/* ===== Main ===== */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

/* ===== Ad Units ===== */
.ad-unit {
  margin: 1.25rem 0;
}

/* ===== Tool Section (card) ===== */
.tool-section {
  background: white;
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-bottom: 1rem;
}

.tool-section h2 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.875rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e8eaf0;
}

/* ===== Preset Grid ===== */
#presets {
  margin-bottom: 0;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.5rem;
}

.preset-btn {
  padding: 0.55rem 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  background: #f0f2f5;
  color: #333;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  min-height: 44px;
  white-space: nowrap;
}

.preset-btn:hover {
  background: #e0e7ff;
  border-color: #6366f1;
  color: #4338ca;
}

.preset-btn.active {
  background: #6366f1;
  color: white;
  border-color: #6366f1;
}

/* ===== Editor Layout ===== */
.editor-layout {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.editor-left,
.editor-right {
  width: 100%;
}

/* ===== Form Groups ===== */
.form-group {
  margin-bottom: 0.875rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: #555;
  margin-bottom: 0.3rem;
}

.range-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.range-row input[type="range"] {
  flex: 1;
  height: 6px;
  accent-color: #6366f1;
  cursor: pointer;
  min-height: 44px;
}

.range-val {
  font-size: 0.82rem;
  font-weight: 700;
  color: #6366f1;
  min-width: 3rem;
  text-align: right;
}

select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.9rem;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  background: white;
  cursor: pointer;
  min-height: 44px;
  appearance: auto;
}

select:focus {
  outline: 2px solid #6366f1;
  outline-offset: 1px;
}

/* ===== Shape Selector ===== */
.shape-selector {
  display: flex;
  gap: 0.5rem;
}

.shape-btn {
  flex: 1;
  padding: 0.55rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: #f0f2f5;
  color: #555;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  min-height: 44px;
}

.shape-btn.active,
.shape-btn[aria-pressed="true"] {
  background: #6366f1;
  color: white;
  border-color: #6366f1;
}

.shape-btn:hover:not(.active) {
  background: #e0e7ff;
  border-color: #a5b4fc;
}

/* ===== cubic-bezier Editor ===== */
.bezier-section {
  text-align: center;
}

#bezier-canvas {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  cursor: crosshair;
  touch-action: none;
  max-width: 200px;
  background: #f9fafb;
}

.bezier-values {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.bezier-input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bezier-input-row label {
  font-size: 0.75rem;
  font-weight: 600;
  color: #555;
  min-width: 2.5rem;
}

.bezier-input-row input {
  flex: 1;
  padding: 0.35rem 0.5rem;
  font-size: 0.85rem;
  border: 1px solid #d1d5db;
  border-radius: 5px;
  min-height: 44px;
}

.bezier-output {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  font-family: monospace;
  color: #6366f1;
  background: #eef2ff;
  padding: 0.4rem 0.75rem;
  border-radius: 5px;
  word-break: break-all;
}

/* ===== Keyframe Editor ===== */
#keyframe-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.keyframe-item {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 0.875rem;
  background: #f9fafb;
  position: relative;
}

.keyframe-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.keyframe-header label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #555;
  white-space: nowrap;
}

.kf-percent {
  width: 4.5rem;
  padding: 0.35rem 0.5rem;
  font-size: 0.9rem;
  border: 1px solid #d1d5db;
  border-radius: 5px;
  min-height: 44px;
}

.btn-remove-kf {
  margin-left: auto;
  background: none;
  border: none;
  color: #ef4444;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.25rem 0.5rem;
  border-radius: 5px;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-remove-kf:hover {
  background: #fee2e2;
}

.kf-props {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.kf-prop-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.kf-prop-group label {
  font-size: 0.72rem;
  font-weight: 600;
  color: #888;
}

.kf-prop-group input[type="text"],
.kf-prop-group input[type="color"] {
  width: 100%;
  padding: 0.3rem 0.5rem;
  font-size: 0.82rem;
  border: 1px solid #d1d5db;
  border-radius: 5px;
  min-height: 44px;
  font-family: monospace;
}

.kf-prop-group input[type="color"] {
  padding: 0.15rem 0.3rem;
  cursor: pointer;
}

.btn-add-kf {
  width: 100%;
  padding: 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: white;
  color: #6366f1;
  border: 2px dashed #a5b4fc;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  min-height: 44px;
}

.btn-add-kf:hover {
  background: #eef2ff;
  border-color: #6366f1;
}

/* ===== Preview ===== */
.preview-section {
  text-align: center;
}

.preview-area {
  background: #1a1a2e;
  border-radius: 8px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  overflow: hidden;
}

.preview-element {
  width: 80px;
  height: 80px;
  background: #6366f1;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
}

.preview-element.shape-circle {
  border-radius: 50%;
}

.preview-element.shape-text {
  width: auto;
  height: auto;
  background: transparent;
  color: #a5b4fc;
  font-size: 1.5rem;
  font-weight: 900;
  padding: 0.5rem 1rem;
}

.preview-controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.btn-play {
  flex: 1;
  max-width: 140px;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 700;
  background: #6366f1;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  min-height: 44px;
}

.btn-play:hover {
  background: #4f46e5;
}

.btn-stop {
  flex: 1;
  max-width: 140px;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 700;
  background: #f0f2f5;
  color: #555;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  min-height: 44px;
}

.btn-stop:hover {
  background: #e5e7eb;
}

/* ===== CSS Output ===== */
.output-section {
  position: relative;
}

.output-toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.btn-copy {
  padding: 0.45rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 700;
  background: #10b981;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
  min-height: 44px;
}

.btn-copy:hover {
  background: #059669;
}

.copy-msg {
  font-size: 0.82rem;
  color: #10b981;
  font-weight: 600;
}

.css-output {
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.8rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
  font-family: "Fira Code", "Courier New", monospace;
  max-height: 320px;
  overflow-y: auto;
}

.css-output code {
  font-family: inherit;
}

/* ===== Howto Section ===== */
.howto-section {
  background: white;
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-top: 1rem;
}

.howto-section h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.75rem;
  margin-top: 1.25rem;
}

.howto-section h2:first-child {
  margin-top: 0;
}

.howto-section ol {
  padding-left: 1.25rem;
  font-size: 0.92rem;
  color: #555;
}

.howto-section li {
  margin-bottom: 0.6rem;
}

.howto-section p {
  font-size: 0.92rem;
  color: #555;
  line-height: 1.75;
}

.howto-section code {
  background: #eef2ff;
  color: #4338ca;
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: monospace;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: #888;
}

footer a {
  color: #666;
  text-decoration: underline;
}

/* ===== Tablet / Desktop ===== */
@media (min-width: 640px) {
  header h1 {
    font-size: 1.5rem;
  }

  main {
    padding: 1.25rem 1.5rem;
  }

  .preset-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .kf-props {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  .editor-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 1rem;
  }

  .editor-left {
    width: 340px;
    flex-shrink: 0;
  }

  .editor-right {
    flex: 1;
    min-width: 0;
  }
}