:root {
  --bg: #0c0e14;
  --bg-elev: #13161f;
  --border: rgba(148, 163, 184, 0.18);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #818cf8;
  --accent-dim: rgba(129, 140, 248, 0.2);
  --radius: 12px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Consolas", monospace;
  color-scheme: dark;
}

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

html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
  overflow: hidden;
  min-height: 0;
  max-height: 100dvh;
}

.app {
  height: 100%;
  max-height: 100dvh;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #12151e 0%, #0c0e14 100%);
}

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

.brand-mark {
  font-size: 1.25rem;
  color: var(--accent);
  opacity: 0.9;
}

.brand-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-sub {
  margin: 0.15rem 0 0;
  font-size: 0.75rem;
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.65rem 0.85rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.15rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
}

.lang-btn {
  font: inherit;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.45rem;
  min-width: 2rem;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.lang-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.lang-btn.is-active {
  color: var(--text);
  background: var(--accent-dim);
  box-shadow: 0 0 0 1px rgba(129, 140, 248, 0.4);
}

.current-label {
  font-size: 0.8rem;
  color: var(--muted);
  max-width: 36vw;
  text-align: right;
}

.site-intro {
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  background: rgba(19, 22, 31, 0.65);
  padding: 0.5rem 1.25rem 0.55rem;
}

.site-intro-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.35rem 0.85rem;
  max-width: 100%;
}

.site-intro-text {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
  flex: 1 1 12rem;
  min-width: 0;
}

.site-intro-nav {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  font-size: 0.72rem;
  flex-shrink: 0;
}

.site-intro-nav a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.site-intro-nav a:hover {
  text-decoration: underline;
}

.site-intro-sep {
  color: var(--muted);
  opacity: 0.7;
  user-select: none;
}

.effect-meta-log {
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #0e1118 0%, #0a0c12 100%);
  max-height: 6.5rem;
  overflow: auto;
  overscroll-behavior: contain;
}

.effect-meta-pre {
  margin: 0;
  padding: 0.5rem 1.25rem 0.55rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.55;
  color: #c7d2fe;
  white-space: pre-wrap;
  word-break: break-word;
}

.layout {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  display: grid;
  grid-template-columns:
    minmax(240px, 1fr)
    minmax(260px, 1.1fr)
    minmax(200px, 260px)
    minmax(160px, 320px);
  /* 1fr 최소값이 콘텐츠 높이로 잡히면 긴 코드가 행을 늘림 → minmax(0,1fr)로 제한 */
  grid-template-rows: minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
}

.layout > * {
  min-width: 0;
  min-height: 0;
}

@media (max-width: 1100px) {
  html {
    max-height: none;
  }

  body {
    overflow: auto;
    max-height: none;
  }

  .app {
    height: auto;
    min-height: 100dvh;
    max-height: none;
    overflow: visible;
  }

  .layout {
    overflow: visible;
    grid-template-columns: 1fr;
    /* 코드 행: auto 대신 상한을 두어 긴 CSS가 페이지 전체를 밀지 않음 */
    grid-template-rows:
      minmax(180px, 38vh)
      minmax(160px, min(50vh, 420px))
      minmax(120px, auto)
      minmax(100px, 180px);
  }

  .panel-ad {
    min-height: 100px;
  }

  .current-label {
    max-width: none;
    text-align: left;
  }
}

.panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--border);
}

.panel:last-child {
  border-right: none;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.panel-hint {
  font-size: 0.65rem;
  color: var(--muted);
  opacity: 0.7;
}

.preview-frame-wrap {
  flex: 1;
  min-height: 0;
  padding: 0.75rem;
  background: #080a10;
}

.preview-frame {
  width: 100%;
  height: 100%;
  min-height: 280px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}

.panel-head-code {
  flex-wrap: wrap;
}

.code-actions {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.code-tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.1rem;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
}

.tab-btn {
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.is-active {
  color: var(--text);
  background: rgba(129, 140, 248, 0.22);
  box-shadow: 0 0 0 1px rgba(129, 140, 248, 0.35);
}

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

.code-panes {
  flex: 1 1 0;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.panel-code .code-block {
  flex: 1 1 0;
  min-height: 0;
  height: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0.85rem 1rem;
  overflow: auto;
  overflow-x: auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.5;
  background: #080a10;
  color: #cbd5e1;
}

.panel-code .code-block code {
  display: block;
  min-width: min-content;
}

.code-pane:not(.is-active) {
  display: none;
}

/* Prism 구문 강조 — 뷰어 패널 배경에 맞춤 (prism-tomorrow 기반 보정) */
.panel-code code[class*="language-"] {
  background: transparent !important;
  text-shadow: none;
}

.panel-code .token.comment,
.panel-code .token.prolog,
.panel-code .token.doctype,
.panel-code .token.cdata {
  color: #6b7280;
}

.panel-code .token.punctuation {
  color: #94a3b8;
}

.panel-code .token.property,
.panel-code .token.tag,
.panel-code .token.boolean,
.panel-code .token.number,
.panel-code .token.constant,
.panel-code .token.symbol,
.panel-code .token.deleted {
  color: #7dd3fc;
}

.panel-code .token.selector,
.panel-code .token.attr-name,
.panel-code .token.string,
.panel-code .token.char,
.panel-code .token.builtin,
.panel-code .token.inserted {
  color: #86efac;
}

.panel-code .token.operator,
.panel-code .token.entity,
.panel-code .token.url,
.panel-code .style .token.string {
  color: #fcd34d;
}

.panel-code .token.atrule,
.panel-code .token.attr-value,
.panel-code .token.keyword,
.panel-code .token.function,
.panel-code .token.class-name {
  color: #c4b5fd;
}

.panel-code .token.regex,
.panel-code .token.important,
.panel-code .token.variable {
  color: #f9a8d4;
}

.panel-code .token.rule,
.panel-code .token.important {
  font-weight: 600;
}

.btn-ghost {
  font: inherit;
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--accent-dim);
  border-color: rgba(129, 140, 248, 0.45);
}

.btn-ghost:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.load-hint {
  margin: 0;
  padding: 0.5rem 0.85rem;
  font-size: 0.72rem;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.08);
  border-top: 1px solid rgba(251, 191, 36, 0.2);
}

.panel-nav {
  background: var(--bg-elev);
}

.nav-search-wrap {
  flex-shrink: 0;
  padding: 0.45rem 0.65rem 0.4rem;
  border-bottom: 1px solid var(--border);
}

.nav-search-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.nav-search-input {
  width: 100%;
  box-sizing: border-box;
  font: inherit;
  font-size: 0.8rem;
  padding: 0.45rem 0.55rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
}

.nav-search-input::placeholder {
  color: var(--muted);
  opacity: 0.85;
}

.nav-search-input:focus {
  outline: none;
  border-color: rgba(129, 140, 248, 0.5);
  box-shadow: 0 0 0 1px rgba(129, 140, 248, 0.25);
}

.nav-search-empty {
  margin: 0;
  padding: 0.35rem 0.65rem 0.45rem;
  font-size: 0.72rem;
  color: var(--muted);
}

.category-root {
  flex: 1;
  overflow: auto;
  padding: 0.5rem 0.65rem 1rem;
}

.cat-section {
  margin-bottom: 0.35rem;
  border-radius: 10px;
  border: 1px solid transparent;
}

.cat-section[open] {
  border-color: var(--border);
  background: rgba(0, 0, 0, 0.15);
}

.cat-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.5rem;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  text-align: left;
  color: var(--text);
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  list-style: none;
  -webkit-appearance: none;
  appearance: none;
}

.cat-toggle::-webkit-details-marker {
  display: none;
}

.cat-toggle:hover {
  background: rgba(255, 255, 255, 0.04);
}

.cat-section:not([open]) .cat-chevron {
  transform: rotate(-90deg);
}

.cat-icon {
  flex-shrink: 0;
}

.cat-label {
  flex: 1;
}

.cat-chevron {
  font-size: 0.65rem;
  color: var(--muted);
  transition: transform 0.2s ease;
}

.effect-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.25rem 0 0.5rem 1.6rem;
}

/* element + 부모까지 붙여 UA 기본 버튼(흰 배경)보다 우선 */
.panel-nav button.effect-btn,
.panel-nav button.demo-btn,
#category-root button.effect-btn,
#category-root button.demo-btn {
  margin: 0;
  font: inherit;
  font-size: 0.8rem;
  padding: 0.45rem 0.6rem;
  text-align: left;
  color: var(--muted);
  background: transparent;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: none;
  -webkit-appearance: none;
  appearance: none;
}

.panel-nav button.effect-btn:hover,
.panel-nav button.demo-btn:hover,
#category-root button.effect-btn:hover,
#category-root button.demo-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  background-color: rgba(255, 255, 255, 0.05);
}

.panel-nav button.effect-btn.is-active,
.panel-nav button.demo-btn.is-active,
#category-root button.effect-btn.is-active,
#category-root button.demo-btn.is-active {
  color: var(--text);
  background: var(--accent-dim);
  background-color: rgba(129, 140, 248, 0.2);
  border-color: rgba(129, 140, 248, 0.35);
}

/* 우측 열: 제목 없이 배경만(광고 슬롯은 시각적으로 구분선만) */
.panel-ad {
  background: linear-gradient(180deg, #0e1118 0%, #0a0c12 100%);
}

.ad-slot-wrap {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 0.65rem 0.65rem 1rem;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.ad-slot-wrap .adsbygoogle {
  width: 100%;
  min-height: 100px;
}