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

:root {
  color-scheme: light;
  --bg: #f5f1ea;
  --bg-deep: #efe6d8;
  --ink: #1d1b16;
  --muted: #5f5647;
  --accent: #ef6b3a;
  --accent-strong: #c34c24;
  --panel: #fffaf2;
  --panel-strong: #f7eddc;
  --shadow: 0 20px 40px rgba(29, 27, 22, 0.15);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #fff2dc 0%, var(--bg) 60%)
    fixed;
  height: 100vh;
}

.app {
  display: grid;
  grid-template-columns: minmax(200px, 240px) minmax(0, 1fr);
  gap: 24px;
  padding: 24px;
  height: 100%;
}

.sidebar {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: calc(100vh - 48px);
  position: sticky;
  top: 24px;
}

.sidebar h1 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
}

.brand .credit {
  text-transform: none;
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  font-weight: 400;
  text-decoration: none;
  opacity: 0.7;
}

.brand .credit:hover {
  color: var(--ink);
  text-decoration: underline;
}

.kata-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-x: hidden;
  scrollbar-width: thin;
}

.kata-category {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.kata-category-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 8px 10px;
  border: none;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.6);
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
  text-align: left;
}

.kata-category-toggle::after {
  content: "▾";
  font-size: 0.9rem;
  color: var(--muted);
  transition: transform 0.2s ease;
}

.kata-category.is-collapsed .kata-category-toggle::after {
  transform: rotate(-90deg);
}

.kata-sublist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.kata-category.is-collapsed .kata-sublist {
  display: none;
}

.kata-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  align-items: center;
  padding: 6px 8px;
  border-radius: 10px;
  background: transparent;
  transition: background 0.2s ease, transform 0.2s ease;
}

.kata-item.kata-home {
  grid-template-columns: 1fr;
  background: rgba(255, 255, 255, 0.55);
  border: 1px dashed rgba(95, 86, 71, 0.3);
}

.kata-item.kata-home .kata-button {
  font-weight: 700;
  letter-spacing: 0.03em;
}

.kata-item.active {
  background: var(--panel-strong);
  transform: translateX(2px);
}

.kata-item.done {
  background: #d9f5d0;
}

.kata-button {
  text-align: left;
  font-size: 0.95rem;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  padding: 4px 0;
  font-family: inherit;
}

.done-toggle {
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
  font-size: 2rem;
  padding: 0;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.done-toggle.is-done {
  background: #1f7a4b;
  color: white;
  border-color: #1f7a4b;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(420px, 2.2fr);
  gap: 24px;
  align-items: stretch;
  animation: lift 0.6s ease;
  max-height: calc(100vh - 48px);
}

.panel {
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}


.instructions {
  padding: 18px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

.instructions h2 {
  margin: 0;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.instructions-content {
  overflow: auto;
  scrollbar-width: thin;
  font-size: 0.95rem;
  color: var(--muted);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.instructions-content h1,
.instructions-content h2,
.instructions-content h3 {
  color: var(--ink);
  margin: 16px 0 8px;
}

.instructions-content p {
  margin: 0 0 10px;
  line-height: 1.5;
}

.instructions-content ul {
  padding-left: 18px;
  margin: 0 0 10px;
}

.studio {
  display: grid;
  grid-template-rows: minmax(240px, 1.1fr) minmax(240px, 1fr);
  gap: 20px;
  min-height: 0;
  height: 100%;
}

.editor {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 0;
  overflow: hidden;
  min-height: 0;
}

.file-list {
  background: var(--panel-strong);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-right: 1px solid rgba(0, 0, 0, 0.08);
}

.file-list button {
  border: none;
  background: transparent;
  text-align: left;
  font-family: "Space Mono", "Courier New", monospace;
  font-size: 0.85rem;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--muted);
}

.file-list button.active {
  background: white;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1);
}

.editor-main {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.editor-header,
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  background: rgba(255, 255, 255, 0.7);
}

.preview-header {
  padding: 8px 16px;
}

.editor-header span {
  font-family: "Space Mono", "Courier New", monospace;
  font-size: 0.9rem;
  color: var(--muted);
}

.preview-title {
  margin-left: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

.editor textarea,
.editor .CodeMirror {
  flex: 1;
  width: 100%;
  border: none;
  resize: none;
  padding: 16px;
  font-family: "Space Mono", "Courier New", monospace;
  font-size: 0.92rem;
  background: transparent;
  color: var(--ink);
  outline: none;
}

.editor .CodeMirror {
  background: transparent;
}

.preview {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.preview iframe {
  border: none;
  flex: 1;
  width: 100%;
  background: white;
  border-radius: 0 0 var(--radius) var(--radius);
}

.actions {
  display: flex;
  gap: 10px;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 8px 14px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: white;
  box-shadow: 0 8px 16px rgba(239, 107, 58, 0.25);
  display: inline-flex;
  align-items: center;
}

.btn.secondary {
  background: white;
  color: var(--accent-strong);
  border: 1px solid rgba(195, 76, 36, 0.4);
  box-shadow: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-icon {
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid currentColor;
  margin-right: 8px;
}

.status {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 10px 16px 12px;
  border-top: 1px dashed rgba(0, 0, 0, 0.08);
  background: rgba(255, 255, 255, 0.6);
}

@keyframes lift {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1100px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    max-height: none;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .studio {
    grid-template-rows: auto auto;
  }
}

@media (max-width: 720px) {
  .editor {
    grid-template-columns: 1fr;
  }

  .file-list {
    flex-direction: row;
    flex-wrap: wrap;
    border-right: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  }
}