/* ============================================================
   Natane Toon Shader - Documentation Site Styles
   natanetoon.com
   ============================================================ */

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

:root {
  --bg-deep:   #0d0d1a;
  --bg-dark:   #1a1a2e;
  --bg-mid:    #16213e;
  --bg-card:   #1e2a45;
  --bg-hover:  #253554;
  --accent:    #e94560;
  --accent2:   #ff6b6b;
  --accent-soft: rgba(233, 69, 96, .15);
  --text:      #e0e0e0;
  --text-dim:  #a0a0b0;
  --text-muted:#707085;
  --border:    #2a2a4a;
  --code-bg:   #0f1525;
  --sidebar-w: 280px;
  --header-h:  56px;
  --content-max: 900px;
  --transition: .25s ease;
}

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', Roboto, sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--accent2); text-decoration: none; transition: color var(--transition); }
a:hover { color: #ff9999; }

img { max-width: 100%; height: auto; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(13, 13, 26, .92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; padding: 0 24px;
}

.header-inner {
  width: 100%; max-width: 1400px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}

.site-logo {
  font-size: 1.15rem; font-weight: 700;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; color: transparent;
  white-space: nowrap;
}

.site-logo a {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; color: transparent;
}

/* ---------- Nav ---------- */
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; }

.nav-links a, .nav-links .nav-dropdown > span {
  padding: 6px 14px; border-radius: 6px; font-size: .85rem; color: var(--text-dim);
  transition: background var(--transition), color var(--transition);
  cursor: pointer; white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active,
.nav-links .nav-dropdown:hover > span {
  background: var(--accent-soft); color: var(--accent2);
}

.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  display: none; position: absolute; top: 100%; left: 0;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  min-width: 220px; padding: 6px 0; box-shadow: 0 8px 32px rgba(0,0,0,.4);
  z-index: 200;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
  display: block; padding: 8px 16px; font-size: .85rem; border-radius: 0;
}
.nav-dropdown-menu a:hover { background: var(--bg-hover); }

/* Hamburger */
.hamburger {
  display: none; background: none; border: none; cursor: pointer;
  width: 32px; height: 32px; position: relative;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--text);
  position: absolute; left: 5px; transition: var(--transition);
}
.hamburger span:nth-child(1) { top: 9px; }
.hamburger span:nth-child(2) { top: 15px; }
.hamburger span:nth-child(3) { top: 21px; }
.hamburger.open span:nth-child(1) { transform: rotate(45deg); top: 15px; }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg); top: 15px; }

/* ---------- Layout ---------- */
.page-wrapper {
  display: flex; margin-top: var(--header-h); min-height: calc(100vh - var(--header-h));
}

/* Sidebar */
.sidebar {
  position: fixed; top: var(--header-h); left: 0; bottom: 0;
  width: var(--sidebar-w); overflow-y: auto;
  background: var(--bg-dark); border-right: 1px solid var(--border);
  padding: 20px 0; z-index: 50;
  scrollbar-width: thin; scrollbar-color: var(--border) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-title {
  font-size: .75rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--text-muted); padding: 0 20px 8px; margin-bottom: 4px;
}

.toc-list { list-style: none; }
.toc-list li a {
  display: block; padding: 5px 20px; font-size: .85rem; color: var(--text-dim);
  border-left: 2px solid transparent; transition: all var(--transition);
}
.toc-list li a:hover { color: var(--text); background: rgba(255,255,255,.03); }
.toc-list li a.active { color: var(--accent2); border-left-color: var(--accent); background: var(--accent-soft); }
.toc-list li.toc-h3 a { padding-left: 36px; font-size: .8rem; }

/* Main content */
.main-content {
  margin-left: var(--sidebar-w); flex: 1; padding: 40px 48px 80px;
  max-width: calc(var(--content-max) + var(--sidebar-w) + 96px);
}

/* ---------- Typography ---------- */
h1 {
  font-size: 2rem; margin-bottom: 8px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; color: transparent;
}
h2 {
  font-size: 1.4rem; margin: 48px 0 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border); color: var(--text);
}
h3 { font-size: 1.1rem; margin: 32px 0 12px; color: var(--accent2); }
h4 { font-size: .95rem; margin: 20px 0 8px; color: var(--text); }

.page-subtitle { font-size: 1rem; color: var(--text-dim); margin-bottom: 32px; }

p { margin-bottom: 12px; }
ul, ol { margin: 0 0 12px 20px; }
li { margin-bottom: 4px; }

code {
  background: var(--code-bg); padding: 2px 6px; border-radius: 4px;
  font-family: 'Cascadia Code', 'Fira Code', monospace; font-size: .88em;
  color: var(--accent2);
}

pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px; overflow-x: auto; margin: 12px 0 20px; line-height: 1.5;
}
pre code { background: none; padding: 0; }

/* ---------- Parameter Cards ---------- */
.param-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px;
  padding: 20px 24px; margin-bottom: 16px;
  transition: border-color var(--transition);
}
.param-card:hover { border-color: var(--accent); }

.param-header {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  margin-bottom: 8px;
}
.param-name { font-weight: 700; font-size: 1rem; color: var(--text); }
.param-prop { font-size: .82rem; color: var(--text-muted); font-family: monospace; }
.param-badge {
  display: inline-block; padding: 2px 10px; border-radius: 12px;
  font-size: .72rem; font-weight: 600; text-transform: uppercase;
}
.badge-range   { background: rgba(100,180,255,.15); color: #64b4ff; }
.badge-toggle  { background: rgba(100,220,150,.15); color: #64dc96; }
.badge-color   { background: rgba(255,180,100,.15); color: #ffb464; }
.badge-texture { background: rgba(200,150,255,.15); color: #c896ff; }
.badge-enum    { background: rgba(255,220,100,.15); color: #ffdc64; }
.badge-float   { background: rgba(180,200,220,.15); color: #b4c8dc; }
.badge-vector  { background: rgba(150,220,200,.15); color: #96dcc8; }

.param-body { color: var(--text-dim); font-size: .9rem; }
.param-body .param-default { color: var(--text-muted); margin-top: 4px; }
.param-body .param-range { color: var(--text-muted); }

.param-tip {
  margin-top: 10px; padding: 8px 14px;
  background: var(--accent-soft); border-radius: 6px; border-left: 3px solid var(--accent);
  font-size: .85rem; color: var(--text-dim);
}
.param-tip::before { content: "💡 "; }

/* ---------- Feature Section ---------- */
.feature-section {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px;
  padding: 20px 24px; margin-bottom: 20px;
}
.feature-section h4 { margin-top: 0; color: var(--accent2); }

/* ---------- Tool Cards ---------- */
.tool-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
  padding: 24px; margin-bottom: 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.tool-card:hover { border-color: var(--accent); box-shadow: 0 4px 24px rgba(233,69,96,.1); }

.tool-card h3 { margin-top: 0; }

.tool-meta {
  display: flex; gap: 16px; margin-bottom: 12px; font-size: .82rem; color: var(--text-muted);
}
.tool-meta span::before { margin-right: 4px; }

.tool-steps { counter-reset: step; list-style: none; margin: 12px 0; padding: 0; }
.tool-steps li {
  counter-increment: step; position: relative; padding: 8px 0 8px 40px;
  border-left: 2px solid var(--border); margin-left: 14px;
}
.tool-steps li::before {
  content: counter(step);
  position: absolute; left: -13px; top: 8px;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: .75rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.tool-steps li:last-child { border-left-color: transparent; }

.tool-tips { margin-top: 10px; }
.tool-tips li { color: var(--text-dim); font-size: .88rem; }

/* ---------- Cards Grid (Top Page) ---------- */
.cards-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px; margin: 24px 0;
}
.card-link {
  display: block; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 24px; text-decoration: none;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.card-link:hover {
  border-color: var(--accent); transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(233,69,96,.15);
}
.card-link h3 { color: var(--accent2); margin: 0 0 8px; font-size: 1.05rem; }
.card-link p { color: var(--text-dim); font-size: .88rem; margin: 0; }
.card-icon { font-size: 1.8rem; margin-bottom: 10px; }

/* ---------- VCC Button ---------- */
.vcc-section { text-align: center; margin: 40px 0; }

.vcc-button {
  display: inline-block; padding: 14px 36px;
  background: linear-gradient(135deg, var(--accent), #c23152);
  color: #fff !important; text-decoration: none; border-radius: 12px;
  font-size: 1.15rem; font-weight: 700;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 15px rgba(233,69,96,.3);
}
.vcc-button:hover {
  transform: translateY(-2px); box-shadow: 0 6px 20px rgba(233,69,96,.5);
  color: #fff !important;
}

.manual-url {
  margin-top: 20px; padding: 14px; background: rgba(255,255,255,.04);
  border-radius: 8px; font-size: .85rem; text-align: center;
}
.manual-url p { margin-bottom: 6px; color: var(--text-muted); }
.manual-url code { color: var(--accent2); }

/* ---------- Hero ---------- */
.hero {
  text-align: center; padding: 48px 0 32px;
}
.hero h1 { font-size: 2.6rem; margin-bottom: 12px; }
.hero .version-badge {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  background: rgba(255,255,255,.06); color: var(--text-muted); font-size: .88rem;
  margin-bottom: 16px;
}
.hero .description { font-size: 1.05rem; color: var(--text-dim); line-height: 1.8; }

/* ---------- Feature Highlights ---------- */
.highlights {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px; margin: 24px 0 40px;
}
.highlight-item {
  padding: 16px; background: rgba(255,255,255,.03); border-radius: 8px;
  text-align: center; font-size: .88rem; color: var(--text-dim);
}
.highlight-item span { display: block; font-size: 1.4rem; margin-bottom: 6px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); padding: 24px;
  text-align: center; color: var(--text-muted); font-size: .82rem;
  margin-left: var(--sidebar-w);
}

/* ---------- Top page (no sidebar) ---------- */
.page-wrapper.no-sidebar .main-content { margin-left: 0; max-width: 100%; }
.page-wrapper.no-sidebar .main-content { padding: 40px 24px 80px; max-width: 960px; margin: 0 auto; }
.page-wrapper.no-sidebar + .site-footer { margin-left: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .hamburger { display: block; }

  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--header-h); right: 0;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 0 0 8px 8px; padding: 8px; min-width: 220px;
    box-shadow: 0 8px 32px rgba(0,0,0,.4);
  }
  .nav-links.open .nav-dropdown-menu {
    position: static; box-shadow: none; border: none; background: transparent;
    display: block; padding-left: 12px;
  }

  .sidebar {
    transform: translateX(-100%); transition: transform var(--transition);
  }
  .sidebar.open { transform: translateX(0); }

  .main-content { margin-left: 0 !important; padding: 24px 16px 60px; }
  .site-footer { margin-left: 0 !important; }
}

@media (max-width: 600px) {
  .hero h1 { font-size: 1.8rem; }
  .cards-grid { grid-template-columns: 1fr; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.2rem; }
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px;
  font-size: .82rem; color: var(--text-muted); margin-bottom: 20px;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--accent2); }
.breadcrumb-sep { color: var(--text-muted); margin: 0 2px; }
.breadcrumb-current { color: var(--text); }

/* ---------- Page Nav (prev/next) ---------- */
.page-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border);
  gap: 16px;
}
.page-nav-prev, .page-nav-next {
  display: inline-block; padding: 10px 20px; border-radius: 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  font-size: .88rem; color: var(--text-dim);
  transition: border-color var(--transition), color var(--transition);
}
.page-nav-prev:hover, .page-nav-next:hover {
  border-color: var(--accent); color: var(--accent2);
}
.page-nav-next { margin-left: auto; }

/* ---------- Category Sidebar Nav ---------- */
.category-nav {
  list-style: none; padding: 0; margin: 0;
}
.category-nav li a {
  display: block; padding: 6px 20px; font-size: .85rem; color: var(--text-dim);
  border-left: 2px solid transparent; transition: all var(--transition);
}
.category-nav li a:hover { color: var(--text); background: rgba(255,255,255,.03); }
.category-nav li a.active {
  color: var(--accent2); border-left-color: var(--accent); background: var(--accent-soft);
}

/* ---------- Category Cards (Portal) ---------- */
.category-cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px; margin: 24px 0;
}
.category-card {
  display: block; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 24px; text-decoration: none;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.category-card:hover {
  border-color: var(--accent); transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(233,69,96,.15);
}
.category-card .card-icon { font-size: 2rem; margin-bottom: 10px; }
.category-card h3 { color: var(--accent2); margin: 0 0 8px; font-size: 1.1rem; }
.category-card p { color: var(--text-dim); font-size: .85rem; margin: 0 0 12px; }
.category-card .page-count { font-size: .78rem; color: var(--text-muted); }

/* ---------- Language Toggle ---------- */
.lang-toggle {
  padding: 4px 12px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--text) !important;
  text-decoration: none !important;
  margin-left: 8px;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.lang-toggle:hover {
  background: var(--accent);
  color: #fff !important;
}

/* ---------- Utility ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }

/* Sidebar toggle (mobile) */
.sidebar-toggle {
  display: none; position: fixed; bottom: 20px; right: 20px; z-index: 200;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent); color: #fff; border: none; cursor: pointer;
  box-shadow: 0 4px 16px rgba(233,69,96,.4); font-size: 1.2rem;
  align-items: center; justify-content: center;
}
@media (max-width: 1024px) {
  .sidebar-toggle { display: flex; }
}