/* ==========================================================================
   Kinetive Training Theme
   Modern documentation/training theme with dark & light mode.
   Brand colors sourced from kinetive.fi.
   ========================================================================== */

/* --------------------------------------------------------------- Tokens */
:root {
  --brand-teal: #00ffe0;
  --brand-teal-strong: #00e6c9;
  --brand-magenta: #ff00d6;
  --brand-blue: #00a8ff;
  --brand-gradient: linear-gradient(135deg, #00ffe0 0%, #00a8ff 50%, #ff00d6 100%);

  --font-sans: "Poppins", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --sidebar-width: 300px;
  --content-max: 860px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 160ms ease;
}

/* Dark theme (default) */
:root,
[data-theme="dark"] {
  --bg: #0a0d12;
  --bg-elevated: #11151c;
  --bg-sidebar: #0c1016;
  --bg-code: #0d1117;
  --bg-code-header: #161b22;
  --surface: #161b22;
  --surface-hover: #1c222b;
  --border: #232a34;
  --border-strong: #313a47;
  --text: #e8ecf1;
  --text-muted: #9aa6b4;
  --text-faint: #6b7683;
  --heading: #ffffff;
  --link: var(--brand-teal);
  --link-hover: #6cfff0;
  --accent: var(--brand-teal);
  --accent-contrast: #04120f;
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.7);
  --glow: 0 0 24px -6px rgba(0, 255, 224, 0.35);
}

/* Light theme */
[data-theme="light"] {
  --bg: #f6f8fa;
  --bg-elevated: #ffffff;
  --bg-sidebar: #ffffff;
  --bg-code: #0d1117;
  --bg-code-header: #161b22;
  --surface: #ffffff;
  --surface-hover: #f0f3f6;
  --border: #e2e7ec;
  --border-strong: #d0d7de;
  --text: #1c2330;
  --text-muted: #56606c;
  --text-faint: #8a94a0;
  --heading: #0a0d12;
  --link: #009e8a;
  --link-hover: #007e6e;
  --accent: #00c4ac;
  --accent-contrast: #04120f;
  --shadow: 0 10px 30px -14px rgba(16, 32, 48, 0.22);
  --glow: 0 0 0 rgba(0, 0, 0, 0);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
}

body.no-scroll { overflow: hidden; }

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

a { color: var(--link); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--link-hover); }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 200;
}
.skip-link:focus { left: 1rem; top: 1rem; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* --------------------------------------------------------------- Layout */
.layout { display: flex; min-height: 100vh; }

.layout__main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  margin-left: var(--sidebar-width);
}

/* --------------------------------------------------------------- Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar__inner { padding: 1.5rem 1.25rem 2rem; }

.sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--heading);
}
.sidebar__brand:hover { color: var(--heading); }

.sidebar__brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brand-gradient);
  box-shadow: var(--glow);
  flex-shrink: 0;
}

.sidebar__close {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
}

.sidebar__tagline {
  margin: 0 0 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Navigation */
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list--nested { margin-top: 0.25rem; }

.nav-list__group { margin: 1.25rem 0 0.5rem; }
.nav-list__group-title {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 0 0.75rem;
  margin-bottom: 0.35rem;
}

.nav-list__link {
  display: block;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.94rem;
  border-left: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.nav-list__link:hover { background: var(--surface-hover); color: var(--text); }
.nav-list__link.is-active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-left-color: var(--accent);
  font-weight: 500;
}

/* Table of contents inside the sidebar */
.toc {
  margin: 0.35rem 0 0.75rem;
  padding: 0.5rem 0 0.5rem 0.75rem;
  border-left: 1px dashed var(--border-strong);
  margin-left: 0.75rem;
}
.toc__label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 0.4rem;
}
.toc nav ul { list-style: none; margin: 0; padding: 0; }
.toc nav ul ul { padding-left: 0.85rem; }
.toc nav li { margin: 0.1rem 0; }
.toc nav a {
  display: block;
  padding: 0.18rem 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-radius: 6px;
}
.toc nav a:hover { color: var(--text); background: var(--surface-hover); }
.toc nav a.is-active { color: var(--accent); font-weight: 500; }

/* --------------------------------------------------------------- Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  height: 60px;
  padding: 0 1.5rem;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar__spacer { flex: 1; }
.topbar__brand { display: none; font-weight: 600; color: var(--heading); }

.topbar__menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.topbar__menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  border-radius: 2px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
[data-theme="dark"] .theme-toggle__icon--sun { display: block; }
[data-theme="dark"] .theme-toggle__icon--moon { display: none; }
[data-theme="light"] .theme-toggle__icon--sun { display: none; }
[data-theme="light"] .theme-toggle__icon--moon { display: block; }

/* --------------------------------------------------------------- Content */
.content {
  flex: 1;
  width: 100%;
  max-width: calc(var(--content-max) + 3rem);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.doc__header { margin-bottom: 2rem; }
.doc__header--hero { padding: 1rem 0 1.5rem; }
.hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.doc__title {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 4vw, 2.9rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--heading);
  letter-spacing: -0.02em;
}
.doc--home .doc__title {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.doc__description { margin: 0; font-size: 1.15rem; color: var(--text-muted); max-width: 60ch; }
.doc__meta {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-faint);
}

/* Prose */
.doc__body { font-size: 1.02rem; }
.doc__body h2,
.doc__body h3,
.doc__body h4 {
  color: var(--heading);
  font-weight: 600;
  line-height: 1.25;
  scroll-margin-top: 80px;
}
.doc__body h2 {
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  font-size: 1.6rem;
}
.doc__body h3 { margin: 2rem 0 0.75rem; font-size: 1.28rem; }
.doc__body h4 { margin: 1.5rem 0 0.5rem; font-size: 1.08rem; }
.doc__body p { margin: 0 0 1.15rem; }
.doc__body ul, .doc__body ol { margin: 0 0 1.15rem; padding-left: 1.5rem; }
.doc__body li { margin: 0.3rem 0; }
.doc__body a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--link) 40%, transparent); }
.doc__body a:hover { text-decoration-color: var(--link-hover); }

.doc__body blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
}
.doc__body blockquote p:last-child { margin-bottom: 0; }

.doc__body hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* Inline code */
.doc__body :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--accent);
}

/* Tables */
.doc__body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.94rem;
}
.doc__body th, .doc__body td {
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--border);
  text-align: left;
}
.doc__body th { background: var(--surface); color: var(--heading); font-weight: 600; }
.doc__body tbody tr:nth-child(even) { background: color-mix(in srgb, var(--surface) 50%, transparent); }

/* --------------------------------------------------------------- Code blocks */
.code-block {
  margin: 1.5rem 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-code);
}
.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.5rem 0.4rem 1rem;
  background: var(--bg-code-header);
  border-bottom: 1px solid var(--border-strong);
}
.code-block__lang {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #8b98a5;
}
.code-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.6rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: #c9d1d9;
  background: transparent;
  border: 1px solid #30363d;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
}
.code-copy:hover { border-color: var(--accent); color: var(--accent); }
.code-copy__icon { flex-shrink: 0; }
.code-copy__icon--check { display: none; color: var(--brand-teal); }
.code-block.is-copied .code-copy { border-color: var(--brand-teal); color: var(--brand-teal); }
.code-block.is-copied .code-copy__icon--copy { display: none; }
.code-block.is-copied .code-copy__icon--check { display: block; }

.code-block pre {
  margin: 0;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  color: #e6edf3;
}
.code-block pre code { font-family: var(--font-mono); background: none; border: none; padding: 0; color: inherit; }

/* Fallback for code blocks without the render hook (e.g. highlight shortcode) */
.doc__body > pre {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow-x: auto;
  background: var(--bg-code);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #e6edf3;
}
.doc__body > pre code { color: inherit; }

/* --------------------------------------------------------------- Mermaid */
pre.mermaid {
  margin: 1.5rem 0;
  padding: 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
  text-align: center;
  overflow-x: auto;
  line-height: normal;
}
/* Hide the raw diagram source until Mermaid has rendered it. */
pre.mermaid:not([data-processed]) {
  color: transparent;
  min-height: 3rem;
}
pre.mermaid svg { max-width: 100%; height: auto; }

/* --------------------------------------------------------------- Kubeconfig */
.kubeconfig {
  margin: 1.5rem 0;
  padding: 1.35rem 1.4rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: border-color var(--transition);
}
.kubeconfig.is-unlocked {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border-strong));
}
.kubeconfig__header {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.35rem;
}
.kubeconfig__lock {
  position: relative;
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--brand-gradient);
  box-shadow: var(--glow);
}
.kubeconfig__lock::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent-contrast);
  -webkit-mask: no-repeat center / 1.05rem url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='18' height='11' rx='2' ry='2'/%3E%3Cpath d='M7 11V7a5 5 0 0 1 10 0v4'/%3E%3C/svg%3E");
  mask: no-repeat center / 1.05rem url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='18' height='11' rx='2' ry='2'/%3E%3Cpath d='M7 11V7a5 5 0 0 1 10 0v4'/%3E%3C/svg%3E");
}
.kubeconfig.is-unlocked .kubeconfig__lock::before {
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='18' height='11' rx='2' ry='2'/%3E%3Cpath d='M7 11V7a5 5 0 0 1 9.9-1'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='18' height='11' rx='2' ry='2'/%3E%3Cpath d='M7 11V7a5 5 0 0 1 9.9-1'/%3E%3C/svg%3E");
}
.kubeconfig__title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--heading);
}
.kubeconfig__message {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}
.kubeconfig__form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.kubeconfig__input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 0.6rem 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.kubeconfig__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
.kubeconfig__unlock,
.kubeconfig__btn {
  padding: 0.6rem 1.1rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), color var(--transition), border-color var(--transition);
}
/* Primary (filled) buttons: unlock + download */
.kubeconfig__unlock,
.kubeconfig__download {
  color: var(--accent-contrast);
  background: var(--accent);
  border: 1px solid var(--accent);
}
.kubeconfig__unlock:hover,
.kubeconfig__download:hover {
  transform: translateY(-1px);
  box-shadow: var(--glow);
}
.kubeconfig__error {
  margin: 0.8rem 0 0;
  color: #ff6b8a;
  font-size: 0.88rem;
}
.kubeconfig__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
/* Secondary (outline) buttons: copy + show/hide */
.kubeconfig__btn {
  font-weight: 500;
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--border-strong);
}
.kubeconfig__btn:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
}
.kubeconfig__btn.is-copied {
  border-color: var(--brand-teal);
  color: var(--brand-teal);
}
.kubeconfig__preview {
  margin: 0.9rem 0 0;
  padding: 0.9rem 1rem;
  max-height: 320px;
  overflow: auto;
  background: var(--bg-code);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.55;
  color: #e6edf3;
  white-space: pre;
}
.kubeconfig__preview code { color: inherit; background: none; border: none; padding: 0; }

/* --------------------------------------------------------------- Quiz */
.quiz {
  margin: 1.75rem 0;
  padding: 1.5rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.quiz__q {
  margin: 0 0 1.25rem;
  padding: 0 0 1.25rem;
  border: none;
  border-bottom: 1px solid var(--border);
}
.quiz__q:last-of-type { border-bottom: none; margin-bottom: 0.5rem; padding-bottom: 0.5rem; }
.quiz__question {
  padding: 0;
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--heading);
}
.quiz__options { display: flex; flex-direction: column; gap: 0.5rem; }
.quiz__option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.quiz__option:hover { border-color: var(--accent); }
.quiz__option input { accent-color: var(--accent); margin: 0; }
.quiz__option.is-correct-option {
  border-color: var(--brand-teal);
  background: color-mix(in srgb, var(--brand-teal) 14%, transparent);
}
.quiz__option.is-wrong-option {
  border-color: #ff6b8a;
  background: color-mix(in srgb, #ff6b8a 14%, transparent);
}
/* Locked state: answers can no longer be changed after checking. */
.quiz.is-locked .quiz__option { cursor: not-allowed; }
.quiz.is-locked .quiz__option:hover { border-color: var(--border-strong); }
.quiz.is-locked .quiz__option.is-correct-option { border-color: var(--brand-teal); }
.quiz.is-locked .quiz__option.is-wrong-option { border-color: #ff6b8a; }
.quiz.is-locked .quiz__option input { cursor: not-allowed; }
.quiz.is-locked .quiz__option-text { opacity: 1; }
.quiz__feedback {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  font-weight: 600;
  min-height: 1em;
}
.quiz__q.is-correct .quiz__feedback { color: var(--brand-teal); }
.quiz__q.is-incorrect .quiz__feedback { color: #ff6b8a; }
.quiz__actions { display: flex; gap: 0.6rem; margin-top: 1.25rem; }
.quiz__check,
.quiz__reset {
  padding: 0.6rem 1.2rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-contrast);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}
.quiz__check:hover,
.quiz__reset:hover { transform: translateY(-1px); box-shadow: var(--glow); }
.quiz__result {
  margin: 1rem 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--heading);
}
.quiz__result.is-warning { color: #ffb020; font-weight: 500; font-size: 0.95rem; }


/* --------------------------------------------------------------- Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}
.card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  color: var(--text);
}
.card__title { margin: 0 0 0.5rem; font-size: 1.2rem; color: var(--heading); }
.card__desc { margin: 0 0 1rem; font-size: 0.92rem; color: var(--text-muted); flex: 1; }
.card__cta { font-size: 0.88rem; font-weight: 600; color: var(--accent); }

/* --------------------------------------------------------------- Buttons */
.button {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.4rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-contrast);
  transition: transform var(--transition), box-shadow var(--transition);
}
.button:hover { transform: translateY(-2px); box-shadow: var(--glow); color: var(--accent-contrast); }

/* --------------------------------------------------------------- Page nav */
.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.page-nav__link {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 48%;
  transition: border-color var(--transition), background var(--transition);
}
.page-nav__link:hover { border-color: var(--accent); background: var(--surface); }
.page-nav__link--next { text-align: right; margin-left: auto; }
.page-nav__dir { font-size: 0.78rem; color: var(--text-faint); }
.page-nav__title { font-weight: 500; color: var(--text); }

/* --------------------------------------------------------------- Footer */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background: var(--bg-sidebar);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  max-width: calc(var(--content-max) + 3rem);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}
.footer__logo {
  display: inline-flex;
  padding: 0.75rem 1rem;
  background: #0a0d12;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.footer__logo img { display: block; }
.footer__meta { text-align: right; }
.footer__copyright { margin: 0; color: var(--text-muted); font-size: 0.9rem; }
.footer__note { margin: 0.25rem 0 0; color: var(--text-faint); font-size: 0.82rem; }

/* --------------------------------------------------------- Language switcher */
.lang-switcher { position: relative; }
.lang-switcher__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  height: 40px;
  padding: 0 0.7rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.lang-switcher__toggle:hover { border-color: var(--accent); color: var(--accent); }
.lang-switcher__menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 160px;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 120;
}
.lang-switcher.is-open .lang-switcher__menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-switcher__item {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.lang-switcher__item:hover { background: var(--surface-hover); color: var(--text); }
.lang-switcher__item.is-active { color: var(--accent); font-weight: 600; }

/* --------------------------------------------------------------- Lightbox */
.doc__body img.is-zoomable { cursor: zoom-in; border-radius: var(--radius-sm); }
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(4, 8, 12, 0.9);
  backdrop-filter: blur(4px);
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox__image {
  max-width: 95vw;
  max-height: 90vh;
  border-radius: var(--radius);
  box-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.8);
  animation: lightbox-in 180ms ease;
}
@keyframes lightbox-in { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: scale(1); } }
.lightbox__close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  font-size: 2rem;
  line-height: 1;
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition);
}
.lightbox__close:hover { background: rgba(255, 255, 255, 0.2); }

/* --------------------------------------------------------- Password gate */
.pw-locked body { overflow: hidden; }
.password-gate {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: var(--bg);
}
.password-gate[hidden] { display: none; }
.password-gate__box {
  width: 100%;
  max-width: 420px;
  padding: 2.5rem 2rem;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.password-gate__mark {
  display: inline-block;
  width: 44px;
  height: 44px;
  margin-bottom: 1.25rem;
  border-radius: 50%;
  background: var(--brand-gradient);
  box-shadow: var(--glow);
}
.password-gate__title { margin: 0 0 0.5rem; font-size: 1.5rem; color: var(--heading); }
.password-gate__message { margin: 0 0 1.5rem; color: var(--text-muted); font-size: 0.95rem; }
.password-gate__form { display: flex; flex-direction: column; gap: 0.75rem; }
.password-gate__input {
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}
.password-gate__input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }
.password-gate__submit {
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-contrast);
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
}
.password-gate__submit:hover { transform: translateY(-1px); box-shadow: var(--glow); }
.password-gate__error { margin: 1rem 0 0; color: #ff6b8a; font-size: 0.88rem; }
.password-gate__hint { margin: 1rem 0 0; color: var(--text-faint); font-size: 0.82rem; }

/* --------------------------------------------------------------- Backdrop */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 95;
}

/* --------------------------------------------------------------- Responsive */
@media (max-width: 1024px) {
  .layout__main { margin-left: 0; }
  .sidebar { transform: translateX(-100%); box-shadow: var(--shadow); }
  .sidebar.is-open { transform: translateX(0); }
  .sidebar__close { display: block; }
  .topbar__menu-toggle { display: flex; }
  .topbar__brand { display: block; }
}

@media (max-width: 600px) {
  .content { padding: 1.5rem 1.1rem 3rem; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .footer__meta { text-align: left; }
  .page-nav { flex-direction: column; }
  .page-nav__link { max-width: 100%; }
  .page-nav__link--next { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}