/* ==========================================================================
   Base: design tokens, reset, typography and shared components.
   Public (public.css) and admin (admin.css) layer their own layouts on top.
   ========================================================================== */

:root {
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --bg: #ffffff;
  --bg-subtle: #f7f7f9;
  --bg-muted: #f0f1f4;
  --surface: #ffffff;
  --text: #0c0d12;
  --text-2: #3b3f4a;
  --muted: #6b7080;
  --faint: #9a9fae;
  --border: #e6e7ec;
  --border-strong: #d3d5dd;

  --accent: #5b4ff5;
  --accent-hover: #4a3ee0;
  --accent-soft: #efedff;
  --accent-text: #4535d6;
  --accent-2: #0ea5e9;

  --success: #147a3d;  --success-soft: #e5f6ec;
  --warning: #9a5b00;  --warning-soft: #fff4dc;
  --danger: #c02a2a;   --danger-soft: #fdeaea;
  --info: #1d63c9;     --info-soft: #e7f0fd;

  --code-bg: #0f1117;
  --code-text: #e6e8ef;
  --inline-code-bg: #f1f0fb;

  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-full: 999px;

  --shadow-xs: 0 1px 2px rgba(16, 18, 27, .05);
  --shadow-sm: 0 1px 3px rgba(16, 18, 27, .06), 0 1px 2px rgba(16, 18, 27, .04);
  --shadow: 0 6px 24px -6px rgba(16, 18, 27, .12), 0 2px 6px rgba(16, 18, 27, .05);
  --shadow-lg: 0 24px 60px -18px rgba(30, 20, 90, .28);
  --ring: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);

  --page-width: 1180px;
  --narrow-width: 720px;
  --wide-width: 1040px;
  --ease: cubic-bezier(.2, .8, .2, 1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0b10;
    --bg-subtle: #0f1117;
    --bg-muted: #161922;
    --surface: #11131a;
    --text: #eceef4;
    --text-2: #c3c7d2;
    --muted: #9096a6;
    --faint: #666c7c;
    --border: #22252f;
    --border-strong: #30343f;
    --accent: #7c72ff;
    --accent-hover: #9189ff;
    --accent-soft: #1d1a3d;
    --accent-text: #a9a3ff;
    --success: #4ade80; --success-soft: #0f2a1b;
    --warning: #fbbf24; --warning-soft: #2b2110;
    --danger: #f87171;  --danger-soft: #2e1515;
    --info: #60a5fa;    --info-soft: #11203a;
    --code-bg: #0b0d13;
    --inline-code-bg: #1b1d2a;
    --shadow: 0 8px 30px -8px rgba(0, 0, 0, .6);
    --shadow-lg: 0 30px 70px -20px rgba(0, 0, 0, .7);
    color-scheme: dark;
  }
}

/* --- Reset -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}
img, video, svg, iframe { display: block; max-width: 100%; }
img { height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.02em; font-weight: 700; color: var(--text); }
code, kbd, pre { font-family: var(--font-mono); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
::selection { background: color-mix(in srgb, var(--accent) 25%, transparent); }

.muted { color: var(--muted); }
.small { font-size: .82rem; }
.mono { font-family: var(--font-mono); }
.nowrap { white-space: nowrap; }
.right { text-align: right; }
.mt-xs { margin-top: 6px; }
.stack > * + * { margin-top: 16px; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 16px; z-index: 100; background: var(--surface); padding: 8px 12px; }

/* --- Buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-weight: 600; font-size: .92rem; line-height: 1.2; cursor: pointer; white-space: nowrap;
  transition: background .15s var(--ease), border-color .15s, color .15s, transform .1s, box-shadow .15s;
  text-decoration: none !important;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 1px 2px rgba(0,0,0,.1), inset 0 1px 0 rgba(255,255,255,.15); }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); box-shadow: var(--shadow-xs); }
.btn-secondary:hover { background: var(--bg-subtle); color: var(--text); }
.btn-ghost { background: transparent; color: var(--text-2); }
.btn-ghost:hover { background: var(--bg-muted); color: var(--text); }
.btn-light { background: #fff; color: #17133b; }
.btn-light:hover { background: #f1f0ff; color: #17133b; }
.btn-danger-outline { background: transparent; color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); }
.btn-danger-outline:hover { background: var(--danger-soft); }
.btn-sm { padding: 7px 12px; font-size: .85rem; }
.btn-xs { padding: 4px 9px; font-size: .78rem; border-radius: var(--radius-xs); }
.btn-lg { padding: 13px 24px; font-size: 1rem; border-radius: var(--radius); }
.btn-block { width: 100%; }
.btn.danger, .link-btn.danger { color: var(--danger); }
.btn-ghost.danger:hover { background: var(--danger-soft); }
.link-btn { background: none; border: 0; padding: 0; color: var(--muted); cursor: pointer; font-size: .85rem; }
.link-btn:hover { color: var(--text); text-decoration: underline; }
.button-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.button-row form { display: contents; }

/* --- Forms --------------------------------------------------------------- */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field label, .editor-head label { font-weight: 600; font-size: .85rem; color: var(--text-2); }
.req { color: var(--danger); }
input:not([type=checkbox]):not([type=radio]):not([type=file]), select, textarea {
  width: 100%; padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: var(--surface);
  transition: border-color .15s, box-shadow .15s; font-size: .95rem;
}
textarea { resize: vertical; line-height: 1.55; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: var(--ring); }
select[multiple] { padding: 6px; }
.has-error input, .has-error textarea, .has-error select { border-color: var(--danger); }
.field-help { font-size: .8rem; color: var(--muted); }
.field-error { font-size: .82rem; color: var(--danger); font-weight: 500; }
.checkbox { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; margin-bottom: 16px; font-weight: 500; }
.checkbox input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--accent); }
.checkbox small { display: block; color: var(--muted); font-weight: 400; font-size: .8rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 640px) { .grid-2 { grid-template-columns: 1fr; } }

/* --- Alerts & badges ---------------------------------------------------- */
.alert { padding: 12px 16px; border-radius: var(--radius-sm); font-size: .92rem; font-weight: 500; margin-bottom: 20px; border: 1px solid transparent; }
.alert-success { background: var(--success-soft); color: var(--success); border-color: color-mix(in srgb, var(--success) 20%, transparent); }
.alert-error { background: var(--danger-soft); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 20%, transparent); }
.alert-info { background: var(--info-soft); color: var(--info); border-color: color-mix(in srgb, var(--info) 20%, transparent); }

.badge { display: inline-flex; align-items: center; gap: 4px; padding: 2px 9px; border-radius: var(--radius-full); font-size: .74rem; font-weight: 600; letter-spacing: .01em; white-space: nowrap; }
.badge-success { background: var(--success-soft); color: var(--success); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.badge-info { background: var(--info-soft); color: var(--info); }
.badge-accent { background: var(--accent-soft); color: var(--accent-text); }
.badge-neutral { background: var(--bg-muted); color: var(--muted); }

.chip { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: var(--radius-full); font-size: .76rem; font-weight: 600; background: var(--bg-muted); color: var(--text-2); }

.level { display: inline-flex; align-items: center; gap: 7px; font-size: .76rem; font-weight: 600; color: var(--text-2); }
.level-bars { display: inline-flex; gap: 2px; align-items: flex-end; }
.level-bars i { width: 3px; border-radius: 2px; background: var(--border-strong); }
.level-bars i:nth-child(1) { height: 6px; } .level-bars i:nth-child(2) { height: 9px; } .level-bars i:nth-child(3) { height: 12px; }
.level-beginner .level-bars i:nth-child(1),
.level-intermediate .level-bars i:nth-child(-n+2),
.level-advanced .level-bars i { background: var(--accent); }

/* --- Avatars ----------------------------------------------------------- */
.avatar { border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.avatar-initials { display: inline-grid; place-items: center; border-radius: 50%; color: #fff; font-weight: 700; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.avatar-sm { width: 28px; height: 28px; font-size: .7rem; }
.avatar-md { width: 40px; height: 40px; font-size: .85rem; }
.avatar-lg { width: 56px; height: 56px; font-size: 1.1rem; }
.avatar-xl { width: 96px; height: 96px; font-size: 1.8rem; }

/* --- Pagination -------------------------------------------------------- */
.pagination { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 40px; font-size: .9rem; }
.page-link { padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-2); font-weight: 500; }
.page-link:hover { background: var(--bg-subtle); text-decoration: none; }
.page-info { color: var(--muted); }

/* --- Brand -------------------------------------------------------------- */
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.08rem; letter-spacing: -.02em; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 22px; height: 22px; border-radius: 7px; position: relative;
  background: conic-gradient(from 210deg, var(--accent), var(--accent-2), #a855f7, var(--accent)); box-shadow: 0 2px 8px -2px var(--accent); }
.brand-mark::after { content: ""; position: absolute; inset: 6px; border-radius: 3px; background: var(--bg); opacity: .9; }

/* --- Prose (rendered Markdown) ----------------------------------------- */
.prose { font-size: 1.075rem; line-height: 1.78; color: var(--text-2); overflow-wrap: break-word; }
.prose > * + * { margin-top: 1.25em; }
.prose h2 { font-size: 1.6rem; margin-top: 2.2em; color: var(--text); }
.prose h3 { font-size: 1.25rem; margin-top: 1.8em; color: var(--text); }
.prose h4 { font-size: 1.05rem; margin-top: 1.6em; }
.prose h2 + *, .prose h3 + * { margin-top: .75em; }
.prose a { color: var(--accent-text); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent); text-underline-offset: 3px; }
.prose a:hover { text-decoration-color: currentColor; }
.prose strong { color: var(--text); font-weight: 650; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: .4em; }
.prose li::marker { color: var(--faint); }
.prose blockquote { border-left: 3px solid var(--accent); padding: .2em 0 .2em 1.2em; color: var(--text); font-size: 1.12em; font-style: italic; }
.prose img { border-radius: var(--radius); border: 1px solid var(--border); margin-inline: auto; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.5em 0; }
.prose :not(pre) > code { font-size: .86em; background: var(--inline-code-bg); color: var(--accent-text); padding: .15em .4em; border-radius: 5px; }
.prose pre {
  background: var(--code-bg); color: var(--code-text); padding: 20px 22px; border-radius: var(--radius);
  overflow-x: auto; font-size: .88rem; line-height: 1.65; border: 1px solid rgba(255,255,255,.06);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04);
}
.prose pre code { font-size: inherit; background: none; padding: 0; color: inherit; }
.prose table { width: 100%; border-collapse: collapse; font-size: .94rem; display: block; overflow-x: auto; }
.prose th, .prose td { padding: 10px 14px; border-bottom: 1px solid var(--border); text-align: left; }
.prose th { font-weight: 600; color: var(--text); background: var(--bg-subtle); }
.prose .footnotes { font-size: .9rem; color: var(--muted); }
.prose-sm { font-size: .95rem; }
.prose-sm h2 { font-size: 1.3rem; }

/* Pygments tokens (GitHub-dark inspired) */
.prose pre .c, .prose pre .c1, .prose pre .cm, .prose pre .ch, .prose pre .cs { color: #7d8799; font-style: italic; }
.prose pre .k, .prose pre .kn, .prose pre .kd, .prose pre .kr, .prose pre .kc, .prose pre .ow { color: #ff7b72; }
.prose pre .kt, .prose pre .nc, .prose pre .nn { color: #ffa657; }
.prose pre .s, .prose pre .s1, .prose pre .s2, .prose pre .sd, .prose pre .si, .prose pre .sb, .prose pre .se, .prose pre .sa { color: #a5d6ff; }
.prose pre .nf, .prose pre .fm { color: #d2a8ff; }
.prose pre .nd { color: #ffa657; }
.prose pre .m, .prose pre .mi, .prose pre .mf, .prose pre .mh { color: #79c0ff; }
.prose pre .nb, .prose pre .bp { color: #79c0ff; }
.prose pre .o, .prose pre .p { color: #c9d1d9; }
.prose pre .nt { color: #7ee787; }
.prose pre .na { color: #79c0ff; }
.prose pre .gp { color: #8b949e; }

/* HTMX request indicator */
.htmx-indicator { opacity: 0; transition: opacity .2s; }
.htmx-request .htmx-indicator, .htmx-request.htmx-indicator { opacity: 1; }
tr.htmx-swapping, .htmx-swapping { opacity: 0; transition: opacity .2s ease-out; }

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