/* ================================================================
   CSS Variables
   ================================================================ */
:root {
  --c-bg:       #0f1117;
  --c-surface:  #1a1d27;
  --c-border:   #2a2d3a;
  --c-text:     #e4e4e7;
  --c-muted:    #8b8d98;
  --c-accent:   #6366f1;
  --c-accent-h: #818cf8;
  --c-code-bg:  #12141c;
  --c-cssonly:   #06b6d4;
  --c-vanilla:  #22c55e;
  --c-success:  #22c55e;
  --c-danger:   #ef4444;
  --radius:     8px;
  --font-mono:  "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

/* ================================================================
   Reset & Base
   ================================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--c-accent-h); text-decoration: none; }

/* ================================================================
   Layout
   ================================================================ */
.app {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

/* ================================================================
   Sidebar
   ================================================================ */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  padding: 1.5rem 0;
  display: flex;
  flex-direction: column;
}
.sidebar__logo {
  padding: 0 1.25rem .75rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-text);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: .75rem;
}
.sidebar__logo small {
  display: block;
  font-weight: 400;
  font-size: .7rem;
  color: var(--c-muted);
  margin-top: .15rem;
}
.sidebar__search {
  padding: 0 1rem .75rem;
}
.sidebar__search input {
  width: 100%;
  padding: .5rem .75rem;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: .85rem;
  outline: none;
  transition: border-color .2s;
}
.sidebar__search input:focus {
  border-color: var(--c-accent);
}
.sidebar__search input::placeholder {
  color: var(--c-muted);
}
.sidebar__nav {
  flex: 1;
  overflow-y: auto;
}
.sidebar__category {
  padding: .4rem 1.25rem;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--c-muted);
  margin-top: .5rem;
}
.sidebar__link {
  display: block;
  padding: .35rem 1.25rem .35rem 1.75rem;
  font-size: .85rem;
  color: var(--c-muted);
  border-left: 2px solid transparent;
  transition: color .15s, background .15s, border-color .15s;
  cursor: pointer;
}
.sidebar__link:hover {
  color: var(--c-text);
  background: rgba(255,255,255,.04);
}
.sidebar__link.is-active {
  color: var(--c-accent-h);
  border-left-color: var(--c-accent);
  background: rgba(99,102,241,.08);
}
.sidebar__count {
  margin-top: auto;
  padding: .75rem 1.25rem 0;
  border-top: 1px solid var(--c-border);
  font-size: .75rem;
  color: var(--c-muted);
}

/* ================================================================
   Main
   ================================================================ */
.main {
  padding: 2rem 2.5rem 4rem;
  max-width: 960px;
}

/* ================================================================
   Hero
   ================================================================ */
.hero {
  margin-bottom: 2.5rem;
}
.hero__title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: .25rem;
}
.hero__desc {
  color: var(--c-muted);
  font-size: .95rem;
}
.hero__admin {
  display: inline-block;
  margin-top: .5rem;
  font-size: .8rem;
  color: var(--c-muted);
  border: 1px solid var(--c-border);
  padding: .25rem .7rem;
  border-radius: var(--radius);
  transition: border-color .2s, color .2s;
}
.hero__admin:hover {
  border-color: var(--c-accent);
  color: var(--c-accent-h);
}

/* ================================================================
   Category filter pills
   ================================================================ */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 2rem;
}
.filter-pill {
  padding: .35rem .85rem;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  background: transparent;
  color: var(--c-muted);
  font-size: .8rem;
  cursor: pointer;
  transition: all .15s;
}
.filter-pill:hover {
  border-color: var(--c-accent);
  color: var(--c-text);
}
.filter-pill.is-active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}

/* ================================================================
   Snippet Card
   ================================================================ */
.snippet {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  overflow: hidden;
  transition: border-color .2s;
}
.snippet:hover {
  border-color: var(--c-accent);
}
.snippet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--c-border);
}
.snippet__title {
  font-size: 1rem;
  font-weight: 600;
}
.snippet__badge {
  font-size: .7rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  background: rgba(99,102,241,.15);
  color: var(--c-accent-h);
}
.snippet__desc {
  padding: .75rem 1.25rem;
  font-size: .85rem;
  color: var(--c-muted);
  border-bottom: 1px solid var(--c-border);
}

/* Code tabs inside a snippet */
.snippet__tabs {
  display: flex;
  border-bottom: 1px solid var(--c-border);
  background: rgba(0,0,0,.15);
}
.snippet__tab {
  padding: .5rem 1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--c-muted);
  font-size: .8rem;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.snippet__tab:hover { color: var(--c-text); }
.snippet__tab.is-active {
  color: var(--c-text);
  border-bottom-color: var(--c-accent);
}
.snippet__tab--cssonly.is-active {
  border-bottom-color: var(--c-cssonly);
}
.snippet__tab--vanilla.is-active {
  border-bottom-color: var(--c-vanilla);
}

/* Code block */
.snippet__code {
  position: relative;
  display: none;
}
.snippet__code.is-active { display: block; }
.snippet__code pre {
  margin: 0;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  background: var(--c-code-bg);
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.65;
  color: var(--c-text);
  white-space: pre;
  tab-size: 2;
}
.snippet__copy {
  position: absolute;
  top: .5rem;
  right: .5rem;
  padding: .3rem .65rem;
  background: var(--c-border);
  border: none;
  border-radius: 4px;
  color: var(--c-muted);
  font-size: .72rem;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.snippet__copy:hover {
  background: var(--c-accent);
  color: #fff;
}
.snippet__copy.is-copied {
  background: var(--c-success);
  color: #fff;
}

/* ================================================================
   Empty state
   ================================================================ */
.empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--c-muted);
}
.empty__icon {
  font-size: 2.5rem;
  margin-bottom: .5rem;
}
.empty__text {
  font-size: .95rem;
}

/* ================================================================
   Responsive (viewer)
   ================================================================ */
@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    left: -280px;
    width: 280px;
    z-index: 1000;
    transition: left .3s;
  }
  .sidebar.is-open { left: 0; }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 999;
  }
  .sidebar-overlay.is-show { display: block; }
  .mobile-header {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .75rem 1rem;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  .mobile-toggle {
    background: none;
    border: 1px solid var(--c-border);
    border-radius: 4px;
    color: var(--c-text);
    padding: .3rem .6rem;
    font-size: 1.1rem;
    cursor: pointer;
  }
  .mobile-header__title {
    font-size: .9rem;
    font-weight: 600;
  }
  .main {
    padding: 1.25rem 1rem 3rem;
  }
}
@media (min-width: 769px) {
  .mobile-header { display: none; }
  .sidebar-overlay { display: none !important; }
}

/* ================================================================
   Admin – Login
   ================================================================ */
.admin-login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.admin-login__card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  text-align: center;
}
.admin-login__title {
  font-size: 1.3rem;
  margin-bottom: .25rem;
}
.admin-login__desc {
  font-size: .85rem;
  color: var(--c-muted);
  margin-bottom: 1.25rem;
}
.admin-login__error {
  color: var(--c-danger);
  font-size: .8rem;
  margin-top: .5rem;
}
.admin-login__back {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: .8rem;
  color: var(--c-muted);
}

/* ================================================================
   Admin – Shared
   ================================================================ */
.admin-input {
  width: 100%;
  padding: .55rem .75rem;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: .9rem;
  outline: none;
  transition: border-color .2s;
}
.admin-input:focus {
  border-color: var(--c-accent);
}
.admin-textarea {
  width: 100%;
  padding: .6rem .75rem;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  tab-size: 2;
  transition: border-color .2s;
}
.admin-textarea:focus {
  border-color: var(--c-accent);
}
.admin-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .5rem 1rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  color: var(--c-text);
  font-size: .85rem;
  cursor: pointer;
  transition: background .15s, border-color .15s;
  white-space: nowrap;
}
.admin-btn:hover {
  border-color: var(--c-accent);
}
.admin-btn--primary {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}
.admin-btn--primary:hover {
  background: var(--c-accent-h);
  border-color: var(--c-accent-h);
}
.admin-btn--accent {
  border-color: var(--c-accent);
  color: var(--c-accent-h);
}
.admin-btn--danger {
  border-color: var(--c-danger);
  color: var(--c-danger);
}
.admin-btn--danger:hover {
  background: var(--c-danger);
  color: #fff;
}
.admin-btn--small {
  padding: .3rem .6rem;
  font-size: .75rem;
}
.required {
  color: var(--c-danger);
}

/* ================================================================
   Admin – Header
   ================================================================ */
.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
  padding: 1rem 1.5rem;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.admin-header__title {
  font-size: 1.1rem;
  font-weight: 700;
}
.admin-header__link {
  font-size: .8rem;
  color: var(--c-muted);
}
.admin-header__actions {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

/* ================================================================
   Admin – Main
   ================================================================ */
.admin-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 4rem;
}
.admin-section {
  margin-bottom: 2rem;
}
.admin-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.admin-section__header h2 {
  font-size: 1.1rem;
}

/* ================================================================
   Admin – List
   ================================================================ */
.admin-list__cat {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--c-muted);
  padding: .75rem 0 .25rem;
  border-bottom: 1px solid var(--c-border);
}
.admin-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--c-border);
}
.admin-list__info {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  flex-wrap: wrap;
  min-width: 0;
}
.admin-list__info strong {
  font-size: .9rem;
}
.admin-list__id {
  font-size: .75rem;
  color: var(--c-muted);
  font-family: var(--font-mono);
}
.admin-list__fields {
  font-size: .7rem;
  color: var(--c-accent-h);
}
.admin-list__actions {
  display: flex;
  gap: .35rem;
  flex-shrink: 0;
}
.admin-empty {
  text-align: center;
  padding: 2rem;
  color: var(--c-muted);
}

/* ================================================================
   Admin – Form
   ================================================================ */
.admin-form-section {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.admin-form-section h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}
.admin-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.admin-form__field {
  margin-bottom: 1rem;
}
.admin-form__field label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  margin-bottom: .3rem;
  color: var(--c-muted);
}
.admin-form__actions {
  display: flex;
  gap: .5rem;
  margin-top: .5rem;
}

@media (max-width: 600px) {
  .admin-form__row {
    grid-template-columns: 1fr;
  }
  .admin-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .admin-list__item {
    flex-direction: column;
    align-items: flex-start;
  }
}