/* =========================================================================
   Reforge — cyberpunk-forge visual identity (v0.13.0)

   Two themes, one semantic token layer:
     - Light (default)  : cream/off-white + orange + dark gray
                          ("roto blanco" palette the user asked for)
     - Dark             : near-black + neon orange + electric cyan,
                          full cyberpunk mood.

   All colors flow through CSS custom properties declared at :root and
   overridden on [data-theme="dark"]. To reskin, touch the tokens —
   never the component rules.

   Typography is system-only (no external fonts — loopback constraint).
   The cyberpunk feel comes from tracking, uppercase headings, monospace
   metadata, and sharp corners rather than exotic typefaces.
   ========================================================================= */

:root {
    /* --- Base surfaces -------------------------------------------------- */
    --bg:           #F3ECDD;   /* roto blanco / cream */
    --bg-grid:      #EAE1CE;   /* subtle grid line color */
    --surface:      #FBF6E9;   /* cards */
    --surface-2:    #ECE3CF;   /* raised panels / active rows */
    --surface-3:    #E0D4B9;   /* pressed / headings */
    --text:         #1E1B17;   /* dark gray, high contrast */
    --text-dim:     #6B5E4D;
    --text-mute:    #9A8C77;
    --border:       #C9BBA0;
    --border-strong:#8A7B64;

    /* --- Primary + secondary ------------------------------------------- */
    --accent:       #E55A1C;   /* signature orange */
    --accent-hi:    #FF7A3E;   /* brighter hover */
    --accent-lo:    #B94712;
    --accent-glow:  rgba(229, 90, 28, 0.28);
    --accent-2:     #1E7A8C;   /* teal counterpart for light mode */

    /* --- Semantic content-type colors ----------------------------------
       One token per "what am I looking at" bucket so the UI reads like
       a map: you learn the color once and can spot it anywhere. */
    --c-workspace:  #1E7A8C;   /* teal   — workspaces */
    --c-catalog:    #E55A1C;   /* orange — challenges/catalog */
    --c-friends:    #B13A7A;   /* magenta — social / friends */
    --c-stats:      #9C6E1A;   /* ochre  — stats + XP */
    --c-sync:       #2E7D32;   /* green  — sync status ok */

    /* --- Verdicts ------------------------------------------------------ */
    --v-pass:       #2E7D32;
    --v-fail:       #C81E1E;
    --v-error:      #B8860B;

    /* --- Tier colors (shared with dark, tuned for light) --------------- */
    --tier-fundamentals: #1F8A3E;
    --tier-intermediate: #1E6FA8;
    --tier-advanced:     #7B3FB8;
    --tier-portfolio:    #B87A00;

    /* --- Rank colors (by XP level) ------------------------------------- */
    --rank-initiate:   #6B5E4D;
    --rank-apprentice: #1E6FA8;
    --rank-adept:      #7B3FB8;
    --rank-master:     #E55A1C;
    --rank-legend:     #B87A00;

    /* --- Shadows ------------------------------------------------------- */
    --shadow-sm: 0 1px 2px rgba(30,27,23,0.10), 0 1px 0 rgba(30,27,23,0.04);
    --shadow-md: 0 2px 8px rgba(30,27,23,0.12);
    --glow:      0 0 0 1px var(--accent), 0 0 12px var(--accent-glow);

    /* --- Motion + radius ----------------------------------------------- */
    --r-sm: 3px;
    --r-md: 4px;
    --r-lg: 6px;
    --t-fast: 120ms cubic-bezier(.4,0,.2,1);
    --t-med:  220ms cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
    --bg:           #0A0C14;
    --bg-grid:      #121623;
    --surface:      #12161F;
    --surface-2:    #1A1F2D;
    --surface-3:    #232A3B;
    --text:         #E8ECF4;
    --text-dim:     #9CA5BA;
    --text-mute:    #6B7386;
    --border:       #2A3142;
    --border-strong:#4A5370;

    --accent:       #FF7A2E;        /* orange stays — brand anchor */
    --accent-hi:    #FFA05C;
    --accent-lo:    #D94F00;
    --accent-glow:  rgba(255,122,46,0.55);
    --accent-2:     #00E5FF;        /* neon cyan secondary */

    --c-workspace:  #00E5FF;
    --c-catalog:    #FF7A2E;
    --c-friends:    #FF3E9A;
    --c-stats:      #FFD84A;
    --c-sync:       #39FF88;

    --v-pass:       #39FF88;
    --v-fail:       #FF3E5F;
    --v-error:      #FFC93A;

    --tier-fundamentals: #39FF88;
    --tier-intermediate: #00E5FF;
    --tier-advanced:     #B47BFF;
    --tier-portfolio:    #FFD84A;

    --rank-initiate:   #8892A8;
    --rank-apprentice: #00E5FF;
    --rank-adept:      #B47BFF;
    --rank-master:     #FF7A2E;
    --rank-legend:     #FFD84A;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.6);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.7);
    --glow:      0 0 0 1px var(--accent), 0 0 18px var(--accent-glow);
}

/* --- Reset + base ---------------------------------------------------------- */

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI",
                 Roboto, "Helvetica Neue", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.5;
    /* Subtle grid backdrop. Cheaper than an image; vanishes on dark mode
       because the second gradient uses the same dim color. Adds just
       enough texture to feel like a "console" rather than a doc. */
    background-image:
        linear-gradient(var(--bg-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
    background-size: 32px 32px, 32px 32px;
    background-position: -1px -1px, -1px -1px;
    transition: background-color var(--t-med), color var(--t-med);
}

code, pre, .mono {
    font-family: ui-monospace, "JetBrains Mono", "Fira Code",
                 Menlo, Consolas, monospace;
    font-size: 0.92em;
}

::selection { background: var(--accent); color: #fff; }

/* --- Header / brand -------------------------------------------------------- */

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 1.25rem;
    background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
    color: var(--text);
    border-bottom: 1px solid var(--border);
    position: relative;
}
/* Orange lightning strip along the header bottom — the "forge spark".
   Carries the brand color into every page without needing a banner. */
header::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 2px;
    background: linear-gradient(90deg,
        transparent 0%, var(--accent) 25%, var(--accent-hi) 50%,
        var(--accent) 75%, transparent 100%);
    box-shadow: 0 0 8px var(--accent-glow);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: inherit;
}
.brand-logo {
    width: 32px; height: 32px;
    flex-shrink: 0;
}
.brand-logo .bl-r { stroke: var(--accent); }
.brand-logo .bl-anvil { fill: currentColor; opacity: 0.45; }
.brand-logo .bl-spark { stroke: var(--c-stats); }
.brand-name {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}
.brand-name .slash { color: var(--accent); margin: 0 0.15em; }

header nav { display: flex; gap: 0.6rem; align-items: center; }
header button, .icon-btn {
    background: transparent;
    color: inherit;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 0.25rem 0.6rem;
    cursor: pointer;
    font: inherit;
    transition: border-color var(--t-fast), background var(--t-fast),
                color var(--t-fast);
}
header button:hover, .icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}
/* Filled buttons in the header (e.g. "Empieza gratis") have an accent
   background: the rule above would paint the text the same colour. */
header .btn-3d:hover { color: var(--accent-on, #fff); }

#theme-toggle { padding: 0.25rem 0.45rem; font-size: 1rem; line-height: 1; }

/* --- Session badges -------------------------------------------------------- */

.stats-badge, .xp-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.15rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.82rem;
    background: var(--surface);
    color: var(--text-dim);
}
.stats-badge { color: var(--c-stats); border-color: var(--c-stats); }

.xp-badge .lv {
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--rank-initiate);
}
/* Rank color classes applied to the xp badge root by app.js.
   Higher ranks get progressively bolder treatments. */
.xp-badge.rank-initiate   { border-color: var(--rank-initiate); }
.xp-badge.rank-apprentice { border-color: var(--rank-apprentice); }
.xp-badge.rank-adept      { border-color: var(--rank-adept); }
.xp-badge.rank-master     { border-color: var(--rank-master); }
.xp-badge.rank-legend     {
    border-color: var(--rank-legend);
    box-shadow: 0 0 0 1px var(--rank-legend), 0 0 10px rgba(184,122,0,0.35);
}
[data-theme="dark"] .xp-badge.rank-legend {
    box-shadow: 0 0 0 1px var(--rank-legend), 0 0 14px rgba(255,216,74,0.55);
}
.xp-badge.rank-initiate   .lv { color: var(--rank-initiate); }
.xp-badge.rank-apprentice .lv { color: var(--rank-apprentice); }
.xp-badge.rank-adept      .lv { color: var(--rank-adept); }
.xp-badge.rank-master     .lv { color: var(--rank-master); }
.xp-badge.rank-legend     .lv { color: var(--rank-legend); }

.xp-badge .rank-name {
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: inherit;
    opacity: 0.9;
}
.xp-bar {
    display: inline-block;
    width: 60px; height: 4px;
    background: var(--surface-2);
    border-radius: 2px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.xp-fill {
    display: block; height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-hi));
    box-shadow: 0 0 4px var(--accent-glow);
    transition: width var(--t-med);
}
.xp-num { font-family: ui-monospace, monospace; font-size: 0.75rem; }

/* --- Main layout ----------------------------------------------------------- */

main { padding: 1.25rem; }

#view-app { display: grid; grid-template-columns: 20rem 1fr; gap: 1rem; }
/* Grid items default to min-width:auto, so a wide README table or code
   line would stretch the column past the screen on phones. */
#view-app > * { min-width: 0; }

aside {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
}
aside h2, .section-heading {
    margin: 0 0 0.6rem 0;
    font-size: 0.78rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
aside h2:not(:first-of-type), .section-heading:not(:first-of-type) {
    margin-top: 1.1rem;
    padding-top: 0.8rem;
    border-top: 1px dashed var(--border);
}

/* Section-heading accent bar — small orange tab on the left.
   Carries the primary color throughout the sidebar without shouting. */
aside h2::before, .section-heading::before {
    content: '';
    display: inline-block;
    width: 3px; height: 10px;
    background: var(--accent);
    margin-right: 0.5rem;
    box-shadow: 0 0 4px var(--accent-glow);
    vertical-align: -1px;
}

/* --- Login view ----------------------------------------------------------- */

#view-login {
    max-width: 22rem;
    margin: 3rem auto;
    background: var(--surface);
    padding: 1.75rem;
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    position: relative;
}
#view-login::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--r-lg);
    padding: 1px;
    background: linear-gradient(135deg,
        var(--accent), transparent 30%, transparent 70%, var(--accent));
    -webkit-mask: linear-gradient(#000 0 0) content-box,
                  linear-gradient(#000 0 0);
    -webkit-mask-composite: xor; mask-composite: exclude;
    pointer-events: none;
    opacity: 0.5;
}
#view-login h2 {
    margin: 0 0 1rem 0;
    font-size: 1rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
}
#view-login label {
    display: block;
    margin-bottom: 0.8rem;
    font-size: 0.82rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}
#view-login input {
    width: 100%;
    padding: 0.55rem 0.65rem;
    margin-top: 0.3rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    border-radius: var(--r-sm);
    font: inherit;
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
#view-login input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
#view-login button[type="submit"] {
    width: 100%;
    padding: 0.6rem;
    background: var(--accent);
    color: #fff;
    border: 0;
    border-radius: var(--r-sm);
    font: inherit;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background var(--t-fast), box-shadow var(--t-fast);
}
#view-login button[type="submit"]:hover {
    background: var(--accent-hi);
    box-shadow: 0 0 16px var(--accent-glow);
}
#view-login .error {
    color: var(--v-fail);
    margin-top: 0.5rem;
    font-size: 0.85rem;
}
#view-login .hint {
    color: var(--text-dim);
    font-size: 0.82rem;
    margin-top: 1rem;
}
#view-login code {
    background: var(--surface-2);
    padding: 1px 5px;
    border-radius: 3px;
    color: var(--accent);
}

/* OAuth buttons */
.oauth-sep {
    display: flex; align-items: center; gap: 0.5rem;
    margin: 1.25rem 0 0.75rem;
    color: var(--text-mute);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
}
.oauth-sep::before, .oauth-sep::after {
    content: ''; flex: 1; border-top: 1px dashed var(--border);
}
.oauth-btn {
    display: flex; align-items: center; justify-content: center;
    gap: 0.5rem; width: 100%;
    padding: 0.55rem;
    border-radius: var(--r-sm);
    font: inherit; text-decoration: none; cursor: pointer;
    transition: border-color var(--t-fast), background var(--t-fast);
}
.oauth-google {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}
.oauth-google:hover { border-color: var(--accent); }
.oauth-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 1.25rem; height: 1.25rem;
    border-radius: 50%;
    background: #4285f4; color: white;
    font-weight: 700; font-size: 0.8rem;
}

/* --- Workspaces list (content-type: workspaces = teal/cyan) --------------- */

#workspaces { list-style: none; padding: 0; margin: 0; }
#workspaces li {
    padding: 0.5rem 0.7rem;
    border-radius: var(--r-sm);
    cursor: pointer;
    border: 1px solid transparent;
    border-left: 3px solid transparent;
    margin-bottom: 0.25rem;
    transition: background var(--t-fast), border-color var(--t-fast);
}
#workspaces li:hover {
    background: var(--surface-2);
    border-left-color: var(--c-workspace);
}
#workspaces li.active {
    background: var(--surface-2);
    border-color: var(--border);
    border-left-color: var(--c-workspace);
    box-shadow: -3px 0 8px -3px var(--c-workspace);
}
#workspaces .meta { font-size: 0.78rem; color: var(--text-dim); }
#workspaces .hint { color: var(--text-mute); font-size: 0.82rem; padding: 0.4rem 0; }

/* --- Catalog list (content-type: catalog = orange) ------------------------ */

#catalog { list-style: none; padding: 0; margin: 0; }
#catalog .catalog-item {
    padding: 0.45rem 0.7rem;
    border-radius: var(--r-sm);
    margin-bottom: 0.2rem;
    border-left: 3px solid var(--c-catalog);
    background: color-mix(in srgb, var(--c-catalog) 6%, transparent);
    font-size: 0.9rem;
}
#catalog .catalog-item.done { opacity: 0.65; }
#catalog .meta { font-size: 0.78rem; color: var(--text-dim); }

/* --- Detail pane ----------------------------------------------------------- */

#detail {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    min-height: 20rem;
}
#detail h2 { margin-top: 0; letter-spacing: 0.04em; }
.stage {
    color: var(--accent);
    font-weight: 700;
    font-family: ui-monospace, monospace;
}
.live-dot {
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--v-pass);
    box-shadow: 0 0 6px var(--v-pass);
    margin-left: 0.4rem;
    animation: pulse 2s ease-in-out infinite;
    vertical-align: middle;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.35; }
}

.attempts-header {
    display: flex; align-items: baseline; justify-content: space-between;
    margin: 1rem 0 0.5rem;
}
.attempts-header h3 {
    margin: 0; font-size: 0.85rem; text-transform: uppercase;
    letter-spacing: 0.16em; color: var(--text-dim);
}
.filter {
    font-size: 0.8rem; color: var(--text-dim);
}
.filter select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 2px 6px;
    font: inherit;
}

.attempts { list-style: none; padding: 0; margin: 0; }
.attempt {
    padding: 0.55rem 0.75rem;
    border-left: 3px solid var(--border);
    background: var(--surface-2);
    margin-bottom: 0.35rem;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    cursor: pointer;
    transition: background var(--t-fast);
}
.attempt:hover { background: var(--surface-3); }
.attempt.pass   { border-left-color: var(--v-pass); }
.attempt.fail   { border-left-color: var(--v-fail); }
.attempt.error  { border-left-color: var(--v-error); }
.attempt .v {
    font-family: ui-monospace, monospace;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.8rem;
    padding: 1px 6px;
    border-radius: 3px;
}
.attempt.pass  .v { color: var(--v-pass);  background: color-mix(in srgb, var(--v-pass) 15%, transparent); }
.attempt.fail  .v { color: var(--v-fail);  background: color-mix(in srgb, var(--v-fail) 15%, transparent); }
.attempt.error .v { color: var(--v-error); background: color-mix(in srgb, var(--v-error) 18%, transparent); }
.attempt time { color: var(--text-dim); font-size: 0.78rem; margin-left: 0.4rem; }
.attempt .permalink {
    color: var(--text-mute); text-decoration: none; margin-left: 0.3rem;
    opacity: 0; transition: opacity var(--t-fast);
}
.attempt:hover .permalink { opacity: 1; }
.attempt .permalink:hover { color: var(--accent); }
.attempt .toggle {
    background: transparent;
    color: var(--text-dim);
    border: 0;
    cursor: pointer;
    font: inherit;
    font-size: 0.8rem;
    padding: 0.25rem 0;
    margin-top: 0.3rem;
}
.attempt .toggle:hover { color: var(--accent); }
.attempt pre {
    margin: 0.35rem 0 0 0;
    background: var(--bg);
    padding: 0.5rem 0.7rem;
    border-radius: var(--r-sm);
    overflow-x: auto;
    font-size: 0.82rem;
    color: var(--text);
    border: 1px solid var(--border);
    max-height: 18rem;
}
.attempt.permalink-hit {
    animation: permalink-flash 2s ease-out;
}
@keyframes permalink-flash {
    0%, 30% { box-shadow: 0 0 0 2px var(--accent), 0 0 12px var(--accent-glow); }
    100%    { box-shadow: none; }
}

.more {
    margin-top: 0.5rem;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 0.35rem 0.7rem;
    cursor: pointer;
    font: inherit;
    transition: border-color var(--t-fast), background var(--t-fast);
}
.more:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }

/* --- Sync dots + lines ----------------------------------------------------- */

.sync-dot {
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    margin-left: 0.3rem;
    vertical-align: middle;
}
.sync-dot.ok      { background: var(--v-pass);  box-shadow: 0 0 4px var(--v-pass); }
.sync-dot.err     { background: var(--v-fail);  box-shadow: 0 0 4px var(--v-fail); }
.sync-dot.pending { background: var(--v-error); box-shadow: 0 0 4px var(--v-error); }

.sync-line {
    padding: 0.4rem 0.6rem;
    border-left: 3px solid var(--c-sync);
    background: color-mix(in srgb, var(--c-sync) 7%, transparent);
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    font-size: 0.85rem;
    margin: 0.5rem 0;
}
.sync-line.err { border-left-color: var(--v-fail); background: color-mix(in srgb, var(--v-fail) 7%, transparent); }

/* --- Achievements --------------------------------------------------------- */

.achievements { list-style: none; padding: 0; margin: 0;
    display: flex; flex-wrap: wrap; gap: 0.3rem; }
.ach {
    display: inline-flex; align-items: center; gap: 0.3rem;
    padding: 3px 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.78rem;
    background: var(--surface);
}
.ach.unlocked { border-color: var(--accent); color: var(--accent); }
.ach.locked   { opacity: 0.45; }
.ach.celebrate { animation: celebrate 1.4s ease-out; }
@keyframes celebrate {
    0%   { transform: scale(1);   box-shadow: 0 0 0 0 var(--accent-glow); }
    30%  { transform: scale(1.12); box-shadow: 0 0 0 10px var(--accent-glow); }
    100% { transform: scale(1);   box-shadow: 0 0 0 0 transparent; }
}
.ach-icon { font-size: 0.95rem; line-height: 1; }
.ach-name { letter-spacing: 0.04em; }

/* Achievement unlock toast stack */
#toasts {
    position: fixed; top: 1rem; right: 1rem;
    display: flex; flex-direction: column; gap: 0.5rem;
    z-index: 100;
}
.toast {
    display: flex; align-items: center; gap: 0.6rem;
    padding: 0.7rem 0.9rem;
    background: var(--surface);
    border: 1px solid var(--accent);
    border-radius: var(--r-md);
    box-shadow: 0 4px 20px var(--accent-glow);
    max-width: 22rem;
    transition: opacity 700ms, transform 700ms;
}
.toast.fade { opacity: 0; transform: translateX(20px); }
.toast-icon { font-size: 1.4rem; }
.toast-title {
    font-size: 0.72rem; letter-spacing: 0.18em;
    text-transform: uppercase; color: var(--accent);
}
.toast-body { font-size: 0.9rem; color: var(--text); }

/* --- Friends + leaderboard (content-type: social = magenta) -------------- */

.friend-form {
    display: grid; gap: 0.35rem;
    margin-bottom: 0.5rem;
}
.friend-form input {
    width: 100%;
    padding: 0.4rem 0.55rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    border-radius: var(--r-sm);
    font: inherit; font-size: 0.85rem;
}
.friend-form input:focus {
    outline: none;
    border-color: var(--c-friends);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--c-friends) 25%, transparent);
}
.friend-form button {
    justify-self: end;
    padding: 0.3rem 0.8rem;
    background: var(--c-friends);
    color: #fff;
    border: 0;
    border-radius: var(--r-sm);
    cursor: pointer;
    font: inherit;
    font-size: 0.82rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.friend-form .error {
    color: var(--v-fail); font-size: 0.82rem; margin: 0;
}

.leaderboard { list-style: none; padding: 0; margin: 0; }
.leader {
    display: grid;
    grid-template-columns: 2.2rem 1fr auto auto;
    gap: 0.4rem;
    align-items: baseline;
    padding: 0.35rem 0.55rem;
    border-left: 3px solid var(--c-friends);
    background: color-mix(in srgb, var(--c-friends) 6%, transparent);
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    margin-bottom: 0.2rem;
    font-size: 0.88rem;
}
.leader.self {
    border-left-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.leader .rank {
    font-family: ui-monospace, monospace;
    color: var(--text-dim);
    font-size: 0.8rem;
}
.leader .name { font-weight: 600; }
.leader .xp {
    font-family: ui-monospace, monospace;
    font-size: 0.78rem;
    color: var(--text-dim);
}
/* Per-rank tint on leaderboard rows. The right-edge xp cell picks
   up the rank color so two users with different levels are visually
   distinct even when their rows are adjacent. */
.leader.rank-initiate   .xp { color: var(--rank-initiate); }
.leader.rank-apprentice .xp { color: var(--rank-apprentice); }
.leader.rank-adept      .xp { color: var(--rank-adept); }
.leader.rank-master     .xp { color: var(--rank-master); }
.leader.rank-legend     .xp { color: var(--rank-legend); text-shadow: 0 0 6px color-mix(in srgb, var(--rank-legend) 50%, transparent); }
/* The self row has no remove button; the empty last column keeps it aligned. */
.leader-remove {
    background: none; border: 0; padding: 0 0.2rem;
    color: var(--text-mute); cursor: pointer; font: inherit; font-size: 0.8rem;
}
.leader-remove:hover, .leader-remove:focus-visible { color: var(--v-fail); }
.friend-form label { line-height: 1.35; }
.friend-form #friend-ok { margin: 0; color: var(--c-sync); }
.friend-requests { list-style: none; padding: 0; margin: 0 0 0.5rem; display: grid; gap: 0.3rem; }
.friend-req {
    display: flex; flex-wrap: wrap; gap: 0.3rem 0.5rem; align-items: center; justify-content: space-between;
    padding: 0.35rem 0.55rem; font-size: 0.84rem;
    border: 1px dashed var(--c-friends); border-radius: var(--r-sm);
}
.friend-req.incoming { border-style: solid; background: color-mix(in srgb, var(--c-friends) 8%, transparent); }
.friend-req-actions { display: flex; gap: 0.3rem; }
.friend-req button {
    padding: 0.2rem 0.6rem; border-radius: var(--r-sm); cursor: pointer; font: inherit; font-size: 0.78rem;
    background: var(--c-friends); color: #fff; border: 1px solid var(--c-friends);
}
.friend-req button.ghost { background: none; color: var(--text-dim); border-color: var(--border); }
.leader .meta.err { color: var(--v-fail); }
.mini-remove {
    background: transparent; border: 0; color: var(--text-mute);
    cursor: pointer; font-size: 1rem; padding: 0 0.2rem;
}
.mini-remove:hover { color: var(--v-fail); }

/* --- Skill tree view ------------------------------------------------------ */

#view-tree {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}
.tree-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px dashed var(--border);
    background: transparent;
    border-top: none;
}
.tree-header::after { display: none; }
.tree-header h2 {
    margin: 0; font-size: 0.9rem;
    text-transform: uppercase; letter-spacing: 0.2em;
    color: var(--accent);
}
.tree-back {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    padding: 0.3rem 0.7rem;
    border-radius: var(--r-sm);
    cursor: pointer;
    font: inherit; font-size: 0.82rem;
    transition: color var(--t-fast), border-color var(--t-fast);
}
.tree-back:hover { color: var(--accent); border-color: var(--accent); }

.tree-cat { margin-bottom: 1.5rem; }
.tree-cat h3 {
    margin: 0 0 0.6rem 0;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--text-dim);
}
.tree-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
    gap: 0.75rem;
}
.tree-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--border);
    border-radius: var(--r-md);
    padding: 0.8rem 0.9rem;
    font-size: 0.88rem;
    transition: border-color var(--t-fast), transform var(--t-fast),
                box-shadow var(--t-fast);
}
.tree-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.tree-card header {
    display: flex; justify-content: space-between; align-items: baseline;
    gap: 0.5rem;
    padding: 0; background: transparent; border: 0;
    margin-bottom: 0.3rem;
}
.tree-card header::after { display: none; }
.tree-card h4 {
    margin: 0; font-size: 0.95rem;
    letter-spacing: 0.02em;
    display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap;
}
.tree-card .meta { font-size: 0.74rem; color: var(--text-dim); }
.tree-desc {
    margin: 0.3rem 0 0.6rem 0;
    font-size: 0.82rem;
    color: var(--text-dim);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.tree-prereq {
    font-size: 0.75rem;
    color: var(--text-mute);
    margin-bottom: 0.4rem;
    font-family: ui-monospace, monospace;
}
.tree-progress {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 0.55rem;
}
.pips { display: inline-flex; gap: 3px; }
.pip {
    display: inline-block;
    width: 10px; height: 10px;
    border: 1px solid var(--border-strong);
    border-radius: 2px;
    background: transparent;
}
.pip.filled {
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 4px var(--accent-glow);
}
.tree-cta {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    border: 0;
    border-radius: var(--r-sm);
    padding: 0.35rem 0.8rem;
    cursor: pointer;
    font: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    transition: background var(--t-fast), box-shadow var(--t-fast);
}
.tree-cta:hover {
    background: var(--accent-hi);
    box-shadow: 0 0 12px var(--accent-glow);
}
.tree-init {
    display: inline-block;
    font-family: ui-monospace, monospace;
    background: var(--bg);
    border: 1px dashed var(--border);
    padding: 0.3rem 0.55rem;
    border-radius: var(--r-sm);
    font-size: 0.78rem;
    color: var(--accent);
    user-select: all;
}

.tree-card.complete { border-left-color: var(--v-pass); }
.tree-card.complete .pip.filled { background: var(--v-pass); border-color: var(--v-pass); box-shadow: 0 0 4px var(--v-pass); }
.tree-card.dim { opacity: 0.85; }
.tree-card.locked { opacity: 0.65; }

/* --- Tier filter + badges -------------------------------------------------- */

.tier-filter {
    display: flex; gap: 0.4rem; flex-wrap: wrap;
    margin: 0 0 1rem 0; padding: 0;
}
.tier-chip {
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: border-color var(--t-fast), background var(--t-fast);
}
.tier-chip:hover { border-color: var(--border-strong); }
.tier-chip.active {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, var(--surface-2));
    box-shadow: 0 0 8px var(--accent-glow);
}
.tier-chip .meta { opacity: 0.75; font-weight: 400; letter-spacing: 0.02em; }

.tier-badge {
    display: inline-block;
    font-size: 0.62rem; font-weight: 700;
    letter-spacing: 0.14em; text-transform: uppercase;
    padding: 2px 7px;
    border-radius: 999px;
    margin-left: 0.25rem;
    vertical-align: middle;
    border: 1px solid currentColor;
    background: color-mix(in srgb, currentColor 8%, transparent);
}

.tier-fundamentals { color: var(--tier-fundamentals); }
.tier-intermediate { color: var(--tier-intermediate); }
.tier-advanced     { color: var(--tier-advanced); }
.tier-portfolio    { color: var(--tier-portfolio); }

.tier-chip.tier-fundamentals.active { background: color-mix(in srgb, var(--tier-fundamentals) 14%, transparent); }
.tier-chip.tier-intermediate.active { background: color-mix(in srgb, var(--tier-intermediate) 14%, transparent); }
.tier-chip.tier-advanced.active     { background: color-mix(in srgb, var(--tier-advanced) 14%, transparent); }
.tier-chip.tier-portfolio.active    { background: color-mix(in srgb, var(--tier-portfolio) 14%, transparent); }

.tree-card.tier-fundamentals { border-left-color: var(--tier-fundamentals); }
.tree-card.tier-intermediate { border-left-color: var(--tier-intermediate); }
.tree-card.tier-advanced     { border-left-color: var(--tier-advanced); }
.tree-card.tier-portfolio    {
    border-left-color: var(--tier-portfolio);
    box-shadow: inset 2px 0 12px -6px var(--tier-portfolio);
}

/* --- Utility --------------------------------------------------------------- */

.hint { color: var(--text-dim); font-size: 0.88rem; }
.hint code, code {
    background: var(--surface-2);
    color: var(--accent);
    padding: 1px 5px;
    border-radius: 3px;
    font-family: ui-monospace, monospace;
    font-size: 0.88em;
}
.error { color: var(--v-fail); }

.view-toggle {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 0 0.4rem;
    cursor: pointer;
    font-size: 0.9rem;
    line-height: 1.3;
    transition: color var(--t-fast), border-color var(--t-fast);
}
.view-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Phase 8: hints + solutions ---------- */
.stage-hints {
    margin: 1rem 0 1.25rem;
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--border);
    border-left: 3px solid var(--c-stats, var(--accent));
    border-radius: var(--r-sm);
    background: var(--surface, transparent);
}
.hints-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.hints-label {
    font-family: ui-monospace, monospace;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
}
.hints-count {
    font-family: ui-monospace, monospace;
    color: var(--accent);
}
.btn-hint, .btn-solution {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: var(--r-sm);
    padding: 0.3rem 0.7rem;
    cursor: pointer;
    font-family: ui-monospace, monospace;
    font-size: 0.82rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: background var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
}
.btn-hint:hover:not(:disabled), .btn-solution:hover {
    background: var(--accent);
    color: var(--bg);
    box-shadow: 0 0 12px var(--accent);
}
.btn-hint:disabled { opacity: 0.55; cursor: progress; }

.hint-list { margin-top: 0.6rem; display: flex; flex-direction: column; gap: 0.5rem; }
.hint-card {
    border: 1px solid var(--border);
    border-left: 2px solid var(--c-stats, var(--accent));
    border-radius: var(--r-sm);
    padding: 0.5rem 0.75rem;
    background: var(--bg);
}
.hint-card-head {
    font-family: ui-monospace, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 0.3rem;
}
.hint-card-body { white-space: pre-wrap; line-height: 1.45; }

.solution-slot { margin-top: 0.75rem; }
.locked { color: var(--text-dim); font-style: italic; }
.btn-solution {
    color: var(--v-pass, var(--accent));
    border-color: var(--v-pass, var(--accent));
}
.btn-solution:hover {
    background: var(--v-pass, var(--accent));
    box-shadow: 0 0 12px var(--v-pass, var(--accent));
}
.solution-body {
    margin-top: 0.5rem;
    border: 1px dashed var(--border);
    border-radius: var(--r-sm);
    padding: 0.5rem 0.75rem;
    background: var(--bg);
}
.solution-md {
    white-space: pre-wrap;
    font-family: ui-monospace, monospace;
    font-size: 0.88em;
    line-height: 1.5;
    margin: 0;
}

/* Responsive: collapse the two-pane layout on narrow screens. */
@media (max-width: 900px) {
    #view-app { grid-template-columns: 1fr; }
}

/* v0.31.0 — auth tabs, run-tests button, catalog clickability */
.auth-tabs { display: flex; gap: 0.5rem; margin: 0 0 1rem 0; }
.tab-btn {
    flex: 1; padding: 0.5rem 1rem; cursor: pointer;
    background: var(--surface); color: var(--text); border: 1px solid var(--border);
    border-radius: 4px; font: inherit;
}
.tab-btn.active {
    background: var(--accent); color: var(--accent-on); border-color: var(--accent);
    font-weight: 600;
}

.run-tests-btn {
    background: var(--accent); color: var(--accent-on);
    border: 0; padding: 0.4rem 0.9rem; border-radius: 4px;
    cursor: pointer; font: inherit; font-weight: 600;
}
.run-tests-btn:hover { filter: brightness(1.1); }
.run-tests-btn:disabled { opacity: 0.5; cursor: progress; }
.run-tests-status { margin-left: 0.6rem; }
.run-tests-status.verdict-pass { color: #2a9d4a; font-weight: 600; }
.run-tests-status.verdict-fail { color: #c43c3c; font-weight: 600; }
.run-tests-status.verdict-error,
.run-tests-status.error { color: #cc6600; font-weight: 600; }

#catalog .catalog-item { cursor: pointer; }
#catalog .catalog-item:hover {
    background: var(--surface-2, var(--surface)); outline: 1px solid var(--accent);
}

/* v0.32.0 — catalog page + nav links + editor tabs */
.nav-link {
    background: transparent; color: var(--text); border: 0;
    padding: 0.4rem 0.9rem; cursor: pointer; font: inherit; font-weight: 500;
    border-bottom: 2px solid transparent; border-radius: 0;
}
.nav-link.active { border-bottom-color: var(--accent); color: var(--accent); }
.nav-link:hover { background: var(--surface-2, var(--surface)); }

.catalog-cta {
    background: var(--accent); color: var(--accent-on);
    border: 0; padding: 0.35rem 0.6rem; cursor: pointer; font: inherit;
    font-size: 0.85em; font-weight: 600; border-radius: 4px;
}

#view-catalog { padding: 1.25rem; max-width: 1200px; margin: 0 auto; }

/* --- Rutas por lenguaje ----------------------------------------------- */
.catalog-tracks-wrap { margin-bottom: 2rem; }
.catalog-tracks-wrap > h2 { margin-top: 0; margin-bottom: 0.5rem; }
.catalog-tracks-wrap > .hint { margin-top: 0; margin-bottom: 1.25rem; }

.catalog-tracks-body {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
}
.track-lang {
    --track-color: var(--accent);
    border: 1px solid var(--border); border-left: 4px solid var(--track-color);
    border-radius: 6px; background: var(--surface);
    padding: 0.85rem 1rem; display: flex; flex-direction: column; gap: 0.75rem;
}
.track-lang-head {
    display: flex; align-items: center; gap: 0.5rem;
}
.track-lang-icon { font-size: 1.5em; }
.track-lang-title { margin: 0; font-size: 1.1em; flex: 1; }
.track-lang-progress {
    font-size: 0.78em; color: var(--muted); font-variant-numeric: tabular-nums;
}
.track-levels { display: flex; flex-direction: column; gap: 0.4rem; }
.track-level {
    border: 1px solid var(--border); border-radius: 5px;
    background: var(--bg); overflow: hidden;
}
.track-level.active { border-color: var(--track-color); }
.track-level.complete { opacity: 0.85; }
.track-level.locked { opacity: 0.55; }
.track-level > summary {
    list-style: none; cursor: pointer; user-select: none;
    padding: 0.55rem 0.75rem;
    display: flex; align-items: center; gap: 0.6rem;
}
.track-level > summary::-webkit-details-marker { display: none; }
.track-level > summary::before {
    content: '▸'; font-size: 0.75em; transition: transform 0.15s ease;
    color: var(--muted);
}
.track-level[open] > summary::before { transform: rotate(90deg); }
.track-level-name { flex: 1; font-weight: 600; }
.track-tier-badge {
    font-size: 0.7em; padding: 0.1rem 0.45rem; border-radius: 10px;
    background: var(--bg-alt, rgba(0,0,0,0.06)); color: var(--muted);
    text-transform: uppercase; letter-spacing: 0.05em;
}
.track-tier-badge.tier-fundamentals { background: rgba(46, 160, 67, 0.15); color: #2ea043; }
.track-tier-badge.tier-intermediate { background: rgba(229, 90, 28, 0.15); color: var(--accent); }
.track-tier-badge.tier-advanced { background: rgba(105, 50, 200, 0.15); color: #6932c8; }
.track-tier-badge.tier-portfolio { background: rgba(200, 30, 130, 0.18); color: #c81e82; }
.track-tier-badge.tier-foundations { background: rgba(46, 160, 67, 0.15); color: #2ea043; }
.track-tier-badge.tier-expert { background: rgba(200, 30, 130, 0.18); color: #c81e82; }
.track-level-progress, .track-level-count {
    font-size: 0.78em; color: var(--muted); font-variant-numeric: tabular-nums;
}
/* Specializations: after the four rungs, set apart from the ladder. */
.track-spec-head {
    margin: 0.6rem 0 0.2rem; font-size: 0.72em; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted);
}
.track-level.spec { border-style: dashed; }
.locked-tag { font-size: 0.85em; }
.locked-pre { font-size: 0.78rem; color: var(--text-dim); font-weight: 400; }

.track-stages {
    list-style: none; margin: 0; padding: 0.25rem 0.75rem 0.65rem;
    display: flex; flex-direction: column; gap: 0.2rem;
    border-top: 1px dashed var(--border);
}
.track-stages .stage {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.3rem 0.4rem; border-radius: 4px;
    cursor: pointer; font-size: 0.92em;
    transition: background 0.1s ease;
}
.track-stages .stage:hover { background: var(--bg-alt, rgba(0,0,0,0.05)); }
.track-stages .stage .stage-icon {
    display: inline-block; width: 1.2em; text-align: center;
    color: var(--muted); font-weight: 700;
}
.track-stages .stage.done .stage-icon { color: #2ea043; }
.track-stages .stage.current { background: rgba(229, 90, 28, 0.1); }
.track-stages .stage.current .stage-icon { color: var(--accent); }
.track-stages .stage.done .stage-id { color: var(--muted); text-decoration: line-through; }

.catalog-toolbar {
    display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap;
    margin-bottom: 1.25rem; padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}
.catalog-toolbar h2 { margin: 0; flex-shrink: 0; }
.catalog-toolbar input,
.catalog-toolbar select {
    padding: 0.4rem 0.7rem; border: 1px solid var(--border);
    background: var(--surface); color: var(--text); border-radius: 4px;
    font: inherit;
}
.catalog-toolbar input { flex: 1; min-width: 200px; }
#catalog-count { margin-left: auto; }

.catalog-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}
.catalog-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 6px; padding: 1rem; cursor: pointer;
    display: flex; flex-direction: column; gap: 0.6rem;
    transition: border-color 0.15s, transform 0.15s;
}
.catalog-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.catalog-card.has-workspace { border-color: var(--accent); }
.catalog-card .card-head {
    display: flex; justify-content: space-between; align-items: baseline;
    gap: 0.5rem;
}
.catalog-card .card-title { font-weight: 600; font-size: 1.05em; }
.catalog-card .card-tier {
    font-size: 0.75em; padding: 0.1rem 0.45rem; border-radius: 999px;
    background: var(--surface-2, var(--border)); color: var(--text);
    text-transform: capitalize; flex-shrink: 0;
}
.catalog-card .card-desc {
    color: var(--text-soft, var(--text)); font-size: 0.9em; line-height: 1.4;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
    overflow: hidden;
}
.catalog-card .card-foot {
    display: flex; justify-content: space-between; gap: 0.5rem;
    font-size: 0.8em; color: var(--text-soft, var(--text));
}
.catalog-card .langs { font-family: ui-monospace, monospace; }

/* Editor tabs in workspace detail */
.detail-tabs {
    display: flex; gap: 0.25rem; margin: 0.75rem 0 1rem 0;
    border-bottom: 1px solid var(--border);
}
.detail-tab {
    background: transparent; border: 0; border-bottom: 2px solid transparent;
    padding: 0.5rem 1rem; cursor: pointer; font: inherit;
    color: var(--text);
}
.detail-tab.active { border-bottom-color: var(--accent); color: var(--accent); font-weight: 600; }
.detail-tab:hover { background: var(--surface-2, var(--surface)); }

.editor-layout {
    display: grid; grid-template-columns: 220px 1fr; gap: 1rem; min-height: 400px;
}
.editor-tree {
    border: 1px solid var(--border); border-radius: 4px;
    background: var(--surface); padding: 0.5rem; overflow-y: auto;
    max-height: 500px;
}
.editor-tree ul { list-style: none; padding-left: 0.7rem; margin: 0; }
.editor-tree > ul { padding-left: 0; }
.editor-tree .tree-dir { font-weight: 600; }
.editor-tree .tree-file {
    cursor: pointer; padding: 0.15rem 0.3rem; border-radius: 3px;
    font-family: ui-monospace, monospace; font-size: 0.85em;
}
.editor-tree .tree-file:hover { background: var(--surface-2, var(--border)); }
.editor-tree .tree-file.active { background: var(--accent); color: var(--accent-on); }

.editor-pane {
    display: flex; flex-direction: column; gap: 0.5rem;
    border: 1px solid var(--border); border-radius: 4px;
    background: var(--surface);
}
.editor-pane-head {
    padding: 0.4rem 0.6rem; border-bottom: 1px solid var(--border);
    display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
    gap: 0.4rem 0.8rem;
    font-family: ui-monospace, monospace; font-size: 0.85em;
}
#editor-current-file { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.editor-textarea {
    flex: 1; min-height: 350px; padding: 0.6rem; resize: vertical;
    font-family: ui-monospace, monospace; font-size: 0.9em;
    background: var(--surface); color: var(--text);
    border: 0; outline: 0; tab-size: 4;
}
.editor-save-btn {
    background: var(--accent); color: var(--accent-on);
    border: 0; padding: 0.3rem 0.7rem; border-radius: 4px;
    cursor: pointer; font: inherit; font-size: 0.85em; font-weight: 600;
}
.editor-save-btn:disabled { opacity: 0.5; }
.editor-save-status { margin-left: 0.5rem; font-size: 0.8em; color: var(--text-soft, var(--text)); }
.editor-run-output {
    margin: 0 0.6rem 0.6rem; padding: 0.6rem; max-height: 260px; overflow: auto;
    white-space: pre-wrap; overflow-wrap: anywhere;
    font-family: ui-monospace, monospace; font-size: 0.85em;
    background: var(--bg); color: var(--text);
    border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 4px;
}

.readme-pane {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 4px; padding: 1rem 1.5rem; max-height: 600px;
    overflow-y: auto; line-height: 1.5;
}
.readme-pane h1, .readme-pane h2, .readme-pane h3 {
    margin-top: 1.2rem; margin-bottom: 0.4rem;
}
.readme-pane h1 { font-size: 1.5em; }
.readme-pane h2 { font-size: 1.25em; }
.readme-pane h3 { font-size: 1.1em; }
.readme-pane code {
    background: var(--surface-2, var(--border)); padding: 0.05rem 0.3rem;
    border-radius: 3px; font-family: ui-monospace, monospace; font-size: 0.9em;
}
.readme-pane pre {
    background: var(--surface-2, var(--border)); padding: 0.75rem;
    border-radius: 4px; overflow-x: auto; font-size: 0.85em;
}
.readme-pane pre code { background: transparent; padding: 0; }
.readme-pane table {
    border-collapse: collapse; margin: 0.6rem 0;
    display: block; max-width: 100%; overflow-x: auto;
}
.readme-pane { overflow-wrap: anywhere; }
.readme-pane th, .readme-pane td {
    border: 1px solid var(--border); padding: 0.3rem 0.6rem; text-align: left;
}
.readme-pane th { background: var(--surface-2, var(--border)); }

/* ============================================================
   v0.32.1 — fixes:
   1. [hidden] !important so #view-app's grid display doesn't override.
   2. Per-category color hint on workspace + catalog cards.
   3. Force-stable detail tab panes (now siblings inside #detail).
   ============================================================ */

/* 1. Honour the hidden attribute everywhere. */
[hidden] { display: none !important; }

/* 2. Per-category accent. JS sets `--cat-color` (HSL) on each
      .catalog-card and #workspaces li via inline style. */
#workspaces li {
    border-left: 3px solid var(--cat-color, var(--c-workspace));
}
#workspaces li:hover  { border-left-color: var(--cat-color, var(--c-workspace)); }
#workspaces li.active {
    border-left-color: var(--cat-color, var(--c-workspace));
    box-shadow: -3px 0 8px -3px var(--cat-color, var(--c-workspace));
}
.catalog-card {
    border-left: 4px solid var(--cat-color, var(--accent));
}
.catalog-card:hover { border-color: var(--cat-color, var(--accent)); }
.catalog-card.has-workspace { border-color: var(--cat-color, var(--accent)); }
.catalog-card .card-tier {
    background: color-mix(in srgb, var(--cat-color, var(--border)) 18%, transparent);
}

/* 3. Detail-pane tab styling — minor adjustments to match the static
      structure now living in index.html. */
#detail-empty   { padding: 1.5rem; }
#detail-header  { margin-bottom: 0.5rem; }
#detail-header  .actions { margin: 0.5rem 0 1rem; }
#pane-attempts  { /* attempts list */ }
#pane-readme.readme-pane { margin-top: 0; }
#pane-files.editor-layout { margin-top: 0; }

/* ============================================================
   v0.58.0 — per-exercise README navigation.
   The README pane now opens on a stage index (stage brief + chips),
   and clicking a chip drills into a single ej-NN's README with a
   back button.
   ============================================================ */
.readme-stage-body { margin-bottom: 1rem; }
.review-banner {
    display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; align-items: center; justify-content: space-between;
    margin-bottom: 1rem; padding: 0.6rem 0.8rem;
    border: 1px solid var(--accent); border-radius: var(--r-md);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
}
.review-exit {
    padding: 0.3rem 0.8rem; border-radius: var(--r-sm); cursor: pointer; font: inherit; font-size: 0.85rem;
    background: var(--accent); color: #fff; border: 0;
}
/* Links in rendered markdown follow the theme (the browser's default
   blue is unreadable on the dark background). */
.readme-stage-body a, #pane-readme a, #legal-body a, .hint a, .ej-link {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.readme-stage-body a:visited, #pane-readme a:visited, #legal-body a:visited { color: var(--accent-lo); }
.readme-stage-body a:hover, #pane-readme a:hover, #legal-body a:hover { color: var(--accent-hi); }
.ej-index {
    margin-top: 1.25rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}
.ej-index h2 { margin: 0 0 0.25rem; font-size: 1.05em; }
.ej-index .hint { margin: 0 0 0.6rem; }
.ej-chips {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(58px, 1fr));
    gap: 0.4rem;
}
.ej-chip {
    cursor: pointer;
    padding: 0.45rem 0.2rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface-2, transparent);
    color: var(--text);
    font: inherit;
    font-weight: 600;
    transition: background 0.12s, border-color 0.12s, transform 0.05s;
}
.ej-chip:hover {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.ej-chip:active { transform: translateY(1px); }
.ej-chip.pass { border-color: var(--v-pass); color: var(--v-pass); }
.ej-chip.fail { border-color: var(--v-fail, var(--accent)); }
.ej-chip[disabled] {
    cursor: not-allowed;
    opacity: 0.4;
}
.ej-toolbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0 0 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}
.ej-back {
    cursor: pointer;
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface-2, transparent);
    color: var(--text);
    font: inherit;
}
.ej-back:hover { border-color: var(--accent); }
.ej-crumb {
    color: var(--text-soft, var(--text));
    font-size: 0.9em;
}
.ej-crumb .ej-sep { opacity: 0.5; padding: 0 0.25rem; }
.ej-run {
    cursor: pointer;
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--accent);
    border-radius: 6px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    color: var(--text);
    font: inherit;
    font-weight: 600;
}
.ej-run:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }
.ej-run:disabled { opacity: 0.5; cursor: not-allowed; }
.ej-crumb-hint {
    margin-left: auto;
    font-size: 0.85em;
}
.ej-crumb-hint code { padding: 0 0.25rem; }
.editor-actions {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 0.6rem;
}
.editor-actions button { white-space: nowrap; }
#editor-run-status.verdict-pass  { color: var(--c-pass, #2ea043); }
#editor-run-status.verdict-fail  { color: var(--accent); }
#editor-run-status.verdict-error { color: #b08000; }
.hint-inline {
    margin-left: 0.5rem;
    font-size: 0.85em;
    opacity: 0.8;
}
.ej-desc {
    margin: 0.4rem 0 0;
    padding: 0 0.75rem;
    color: var(--text-soft, var(--text));
    font-size: 0.9em;
}

/* ---------- Feedback al acertar (celebrate.js) ------------------------------- */
.stage-forged {
    position: fixed; left: 50%; top: 38%; z-index: 120;
    transform: translate(-50%, -50%);
    display: flex; flex-direction: column; align-items: center; gap: .35rem;
    padding: 1.4rem 2.2rem; min-width: min(90vw, 340px);
    background: var(--surface); color: var(--text);
    border: 2px solid var(--accent); border-radius: 14px;
    box-shadow: var(--glow), 0 18px 50px rgba(0, 0, 0, .35);
    text-align: center;
    animation: sf-in .35s cubic-bezier(.2, .9, .3, 1.3) both;
}
.stage-forged .sf-icon { font-size: 2.6rem; line-height: 1; }
.stage-forged strong { font-size: 1.35rem; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
.stage-forged small { color: var(--text-dim, var(--text)); opacity: .8; }
.stage-forged.leaving { animation: sf-out .3s ease-in both; }
@keyframes sf-in { from { opacity: 0; transform: translate(-50%, -50%) scale(.7); } }
@keyframes sf-out { to { opacity: 0; transform: translate(-50%, -60%) scale(.95); } }

/* "✏ Resolver ej-NN" en el enunciado y "▶ Seguir por" en el índice. */
.ej-solve, .ej-continue {
    cursor: pointer; font: inherit; font-weight: 700;
    padding: .4rem .9rem; border-radius: 6px;
    border: 1px solid var(--accent); background: var(--accent); color: #fff;
}
.ej-solve:hover, .ej-continue:hover { background: var(--accent-hi, var(--accent)); }
.ej-continue { margin: .2rem 0 .8rem; }
.editor-keys { font-size: .8em; opacity: .75; padding: 0 .6rem .4rem; }

/* Árbol de ficheros: solo el stage actual abierto. */
.editor-tree details > summary { cursor: pointer; list-style: none; }
.editor-tree details > summary::-webkit-details-marker { display: none; }
.editor-tree details > summary::before { content: '▸ '; opacity: .6; }
.editor-tree details[open] > summary::before { content: '▾ '; }

@media (prefers-reduced-motion: reduce) {
    .stage-forged, .stage-forged.leaving { animation: none; }
}

/* Barra del enunciado: los botones no se aplastan; el texto de ayuda
   baja a su propia línea cuando no cabe. */
.ej-toolbar { flex-wrap: wrap; row-gap: .4rem; }
.ej-toolbar .ej-back, .ej-toolbar .ej-solve, .ej-toolbar .ej-crumb { white-space: nowrap; flex-shrink: 0; }
.ej-toolbar .ej-crumb-hint { flex: 1 1 14rem; margin-left: 0; }