/* ═══════════════════════════════════════════════════════════
   LEARN MODULE — Fase 1 Python
   Compatible: dark/light/custom themes, mobile, desktop
═══════════════════════════════════════════════════════════ */

/* ── Página learn ───────────────────────────────────────── */
#learnPage {
    display: none;
    flex: 1;
    flex-direction: column;
    height: 100vh;
    background: var(--bg);
    min-width: 0;
    overflow: hidden;
}
#learnPage.active { display: flex; }

/* ── Topbar del learn (reutiliza .topbar) ───────────────── */
#learnPage .topbar { flex-shrink: 0; }

/* ── Scroll container ───────────────────────────────────── */
.learn-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 20px 20px 40px;
}

/* ── Wrapper ────────────────────────────────────────────── */
.learn-wrap {
    max-width: 960px;
    margin: 0 auto;
    width: 100%;
}

/* ── Header ─────────────────────────────────────────────── */
.learn-header {
    margin-bottom: 20px;
}
.learn-header-title {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}
.learn-header-title svg { flex-shrink: 0; margin-top: 2px; }
.learn-header-title h2 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.3;
}
.learn-header-title p {
    font-size: 13px;
    color: var(--text-2);
    margin-top: 2px;
}
.learn-xp-inline { color: var(--accent); font-weight: 500; }

.learn-progress-bar-wrap {
    height: 5px;
    background: var(--surface-3);
    border-radius: 99px;
    overflow: hidden;
}
.learn-progress-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 99px;
    transition: width 0.5s cubic-bezier(.4,0,.2,1);
}

/* ── Layout ─────────────────────────────────────────────── */
.learn-layout {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.learn-sidebar {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: sticky;
    top: 0;
    max-height: calc(100vh - 160px);
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--border-2) transparent;
    padding-right: 4px;
}

.learn-unit-group { margin-bottom: 10px; }

.learn-unit-label {
    font-size: 10.5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-3);
    padding: 4px 10px;
    margin-bottom: 3px;
}

.learn-lesson-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 7px 10px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-2);
    text-align: left;
    transition: background 0.15s, color 0.15s;
    line-height: 1.3;
}
.learn-lesson-btn:hover:not(:disabled) { background: var(--surface-3); color: var(--text); }
.learn-lesson-btn:active:not(:disabled) { transform: scale(0.97); }
.learn-lesson-btn.active { background: var(--surface-3); color: var(--text); font-weight: 500; }
.learn-lesson-btn.done { color: var(--text-2); }
.learn-lesson-btn.locked { opacity: 0.38; cursor: not-allowed; }

.learn-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 600;
    flex-shrink: 0;
    border: 1.5px solid var(--border-2);
    color: var(--text-3);
    transition: all 0.2s;
}
.learn-lesson-btn.active .learn-dot { border-color: var(--accent); color: var(--accent); }
.learn-lesson-btn.done .learn-dot { background: var(--accent); border-color: var(--accent); color: #fff; }

.learn-lesson-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ── Content panel ───────────────────────────────────────── */
.learn-content-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.learn-content-body {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    max-height: calc(100vh - 220px);
}

.learn-lesson-inner { padding: 20px 20px 8px; }

/* ── Lesson tag ─────────────────────────────────────────── */
.learn-lesson-tag {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 600;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 99px;
    padding: 3px 10px;
    margin-bottom: 10px;
}

.learn-lesson-title-main { font-size: 18px; font-weight: 600; color: var(--text); margin-bottom: 8px; line-height: 1.3; }
.learn-lesson-desc { font-size: 13.5px; color: var(--text-2); line-height: 1.7; margin-bottom: 14px; }

/* ── Theory block ────────────────────────────────────────── */
.learn-theory-block {
    border-left: 2.5px solid var(--accent);
    padding: 10px 14px;
    background: var(--surface-2);
    border-radius: 0 8px 8px 0;
    margin-bottom: 14px;
    font-size: 13px;
    line-height: 1.75;
    color: var(--text);
}
.learn-theory-block code {
    background: var(--surface-3);
    padding: 1px 5px;
    border-radius: 4px;
    font-size: 12px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    color: var(--accent);
}

/* ── Code block ──────────────────────────────────────────── */
.learn-code-block {
    background: #0d0d10;
    border-radius: 10px;
    margin-bottom: 12px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.06);
}
.learn-code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.learn-code-lang {
    font-size: 11px;
    font-weight: 600;
    color: rgba(255,255,255,0.3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.learn-copy-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.5);
    border-radius: 6px;
    padding: 3px 8px;
    font-size: 11px;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s, color 0.15s;
}
.learn-copy-btn:hover { background: rgba(255,255,255,0.12); color: rgba(255,255,255,0.8); }
.learn-copy-btn:active { transform: scale(0.95); }

.learn-code-block pre {
    padding: 14px 16px;
    overflow-x: auto;
    margin: 0;
    -webkit-overflow-scrolling: touch;
}
.learn-code-block code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.75;
    color: #cdd6f4;
}
/* Syntax colors */
.learn-code-block .c  { color: #6c7086; font-style: italic; }
.learn-code-block .k  { color: #cba6f7; }
.learn-code-block .s  { color: #a6e3a1; }
.learn-code-block .f  { color: #89b4fa; }
.learn-code-block .n  { color: #f38ba8; }
.learn-code-block .nb { color: #fab387; }

/* ── Output block ────────────────────────────────────────── */
.learn-output-block {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 14px;
    margin-bottom: 14px;
}
.learn-output-label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-3);
    margin-bottom: 6px;
}
.learn-output-pre {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 12.5px;
    color: var(--text-2);
    white-space: pre-wrap;
    line-height: 1.7;
    margin: 0;
}

/* ── Tips grid ───────────────────────────────────────────── */
.learn-tips-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding-bottom: 4px;
}
.learn-tip-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 12.5px;
    color: var(--text-2);
    line-height: 1.55;
}
.learn-tip-card strong {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}
.learn-tip-card code {
    background: var(--surface-3);
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 11.5px;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
}

/* ── Footer con navegación ───────────────────────────────── */
.learn-content-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    background: var(--surface-2);
    flex-shrink: 0;
}
.learn-nav-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px 14px;
    border: 1px solid var(--border-2);
    border-radius: 8px;
    background: transparent;
    font-size: 13px;
    font-family: inherit;
    color: var(--text);
    cursor: pointer;
    transition: background 0.15s;
    user-select: none;
    -webkit-user-select: none;
}
.learn-nav-btn:hover:not(:disabled) { background: var(--surface-3); }
.learn-nav-btn:active:not(:disabled) { transform: scale(0.96); }
.learn-nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.learn-nav-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 500; }
.learn-nav-primary:hover:not(:disabled) { opacity: 0.88; background: var(--accent); }

.learn-xp-badge { font-size: 12px; color: var(--text-3); text-align: center; }
.learn-xp-pending { color: var(--text-3); }
.learn-xp-done { color: var(--accent); font-weight: 500; }

/* ── Completion screen ───────────────────────────────────── */
.learn-completion {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
    gap: 8px;
    min-height: 300px;
}
.learn-completion-icon { font-size: 48px; margin-bottom: 8px; }
.learn-completion h2 { font-size: 20px; font-weight: 600; color: var(--text); }
.learn-completion p { font-size: 14px; color: var(--text-2); line-height: 1.6; }

/* ── Tab button en topbar ────────────────────────────────── */
.learn-tab-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border-2);
    border-radius: 8px;
    background: transparent;
    font-size: 13px;
    font-family: inherit;
    color: var(--text-2);
    cursor: pointer;
    transition: all 0.15s;
    user-select: none;
    -webkit-user-select: none;
    font-weight: 500;
}
.learn-tab-btn:hover { background: var(--surface-3); color: var(--text); }
.learn-tab-btn:active { transform: scale(0.96); }
.learn-tab-btn.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }

/* ── Responsive mobile ───────────────────────────────────── */
@media (max-width: 640px) {
    .learn-layout { grid-template-columns: 1fr; }
    .learn-sidebar {
        position: static;
        max-height: none;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        overflow: visible;
        padding-right: 0;
    }
    .learn-unit-group { margin-bottom: 4px; }
    .learn-tips-grid { grid-template-columns: 1fr; }
    .learn-scroll { padding: 12px 12px 32px; }
    .learn-lesson-inner { padding: 14px 14px 6px; }
    .learn-content-body { max-height: none; }
    .learn-lesson-btn { font-size: 12px; padding: 6px 8px; }
    .learn-unit-label { display: none; }
}

@media (max-width: 360px) {
    .learn-sidebar { grid-template-columns: 1fr; }
}