/* ============================================================================
   CONTENT PANELS - Rich narrative overlay system
   - Semi-transparent overlays (background must show through)
   - Three built-in themes: glass, solid, minimal
   - Fully themeable via CSS custom properties
   - Responsive (desktop → tablet → mobile)
   - Touch-friendly (iPad / Android tablet)
   - Safari / WebKit compatible
   ============================================================================ */

/* ── Custom Properties (defaults) ───────────────────────────────────────── */

.cp-panel {
    --cp-font:              inherit;
    --cp-text:              rgba(255, 255, 255, 0.92);
    --cp-heading:           rgba(255, 255, 255, 0.96);
    --cp-accent:            rgba(255, 255, 255, 0.96);
    --cp-border:            rgba(255, 255, 255, 0.08);

    --cp-btn-bg:            rgba(255, 255, 255, 0.12);
    --cp-btn-bg-hover:      rgba(255, 255, 255, 0.20);
    --cp-btn-text:          rgba(255, 255, 255, 0.95);
    --cp-btn-radius:        10px;

    --cp-scrollbar:         rgba(255, 255, 255, 0.18);
    --cp-scrollbar-hover:   rgba(255, 255, 255, 0.30);
    --cp-blockquote-border: rgba(255, 255, 255, 0.18);
    --cp-code-bg:           rgba(255, 255, 255, 0.08);

    --cp-transition:        300ms ease;
}

/* ── Container ──────────────────────────────────────────────────────────── */

.cp-container {
    position: absolute;
    inset: 0;
    pointer-events: auto;
    /* Prevent text selection on fast taps (tablets) */
    -webkit-user-select: none;
    user-select: none;
}

/* ── Backdrop ───────────────────────────────────────────────────────────── */

.cp-backdrop {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity var(--cp-transition);
}
.cp-backdrop--visible {
    opacity: 1;
}

.cp-backdrop--dim {
    background: rgba(0, 0, 0, 0.35);
}
.cp-backdrop--blur {
    background: rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.cp-backdrop--none {
    pointer-events: none;
}

/* ── Panel (shared) ─────────────────────────────────────────────────────── */

.cp-panel {
    position: absolute;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    color: var(--cp-text);
    font-family: var(--cp-font);

    /* Enter animation — starts hidden */
    opacity: 0;
    transform: translateX(-12px);
    transition:
        opacity var(--cp-transition),
        transform var(--cp-transition);
}
.cp-panel--visible {
    opacity: 1;
    transform: translateX(0);
}

/* ── Theme: Glass ───────────────────────────────────────────────────────── */

.cp-panel--glass {
    background: rgba(10, 15, 30, 0.82);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.45),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* ── Theme: Solid ───────────────────────────────────────────────────────── */

.cp-panel--solid {
    background: var(--cp-bg, #1a1d2e);
    border: 1px solid var(--cp-border);
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.55);
}

/* ── Theme: Minimal ─────────────────────────────────────────────────────── */

.cp-panel--minimal {
    background: rgba(0, 0, 0, 0.60);
    border-radius: 8px;
}

/* ── Header ─────────────────────────────────────────────────────────────── */

.cp-header {
    padding: 1.25rem 1.5rem 0.5rem;
    flex-shrink: 0;
}

.cp-title {
    margin: 0;
    font-size: 1.4em;
    font-weight: 700;
    color: var(--cp-heading);
    letter-spacing: 0.02em;
    line-height: 1.3;
}

/* ── Body ───────────────────────────────────────────────────────────────── */

.cp-body {
    flex: 1 1 auto;
    padding: 0.5rem 1.5rem 1rem;
    overflow: hidden;
    /* Allow text selection only within body */
    -webkit-user-select: text;
    user-select: text;
}
.cp-body--scrollable {
    overflow-y: auto;
    overscroll-behavior: contain;
    scroll-behavior: smooth;
    /* iOS smooth scroll */
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
}

/* Scrollbar styling */
.cp-body::-webkit-scrollbar {
    width: 5px;
}
.cp-body::-webkit-scrollbar-track {
    background: transparent;
}
.cp-body::-webkit-scrollbar-thumb {
    background: var(--cp-scrollbar);
    border-radius: 3px;
}
.cp-body::-webkit-scrollbar-thumb:hover {
    background: var(--cp-scrollbar-hover);
}

/* Firefox scrollbar */
.cp-body {
    scrollbar-width: thin;
    scrollbar-color: var(--cp-scrollbar) transparent;
}

/* ── Rendered content typography ────────────────────────────────────────── */

.cp-content h1,
.cp-content h2,
.cp-content h3,
.cp-content h4 {
    color: var(--cp-heading);
    margin: 1em 0 0.45em;
    line-height: 1.3;
    font-weight: 700;
}
.cp-content h1:first-child,
.cp-content h2:first-child,
.cp-content h3:first-child {
    margin-top: 0;
}
.cp-content h1 { font-size: 1.5em; }
.cp-content h2 { font-size: 1.3em; }
.cp-content h3 { font-size: 1.15em; }

.cp-content p {
    margin: 0.55em 0;
    line-height: 1.65;
}

.cp-content strong {
    color: var(--cp-accent);
    font-weight: 700;
}

.cp-content em {
    font-style: italic;
    opacity: 0.88;
}

.cp-content ul,
.cp-content ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}
.cp-content li {
    margin: 0.3em 0;
    line-height: 1.55;
}

.cp-content blockquote {
    border-left: 3px solid var(--cp-blockquote-border);
    margin: 0.8em 0;
    padding: 0.4em 1em;
    opacity: 0.85;
    font-style: italic;
}

.cp-content code {
    background: var(--cp-code-bg);
    padding: 0.12em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: monospace;
}

.cp-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 0.7em 0;
    display: block;
}

.cp-content hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin: 1.2em 0;
}

.cp-content a {
    color: var(--cp-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ── Footer ─────────────────────────────────────────────────────────────── */

.cp-footer {
    padding: 0.6rem 1.5rem 1rem;
    display: flex;
    justify-content: flex-end;
    flex-shrink: 0;
}

.cp-btn {
    padding: 0.55em 1.5em;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--cp-btn-radius);
    font-size: 0.92em;
    font-weight: 600;
    cursor: pointer;
    background: var(--cp-btn-bg);
    color: var(--cp-btn-text);
    transition:
        background 0.2s ease,
        transform 0.15s ease,
        border-color 0.2s ease;
    /* Touch optimisation */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.cp-btn:hover {
    background: var(--cp-btn-bg-hover);
    border-color: rgba(255, 255, 255, 0.25);
}
.cp-btn:active {
    transform: scale(0.97);
}
.cp-btn:focus-visible {
    outline: 2px solid var(--cp-accent);
    outline-offset: 2px;
}

/* ── Responsive: tablet portrait ────────────────────────────────────────── */

@media (max-width: 1024px) {
    .cp-title {
        font-size: 1.25em;
    }
    .cp-content {
        font-size: 0.95em;
    }
}

/* ── Responsive: phone / small tablet ───────────────────────────────────── */

@media (max-width: 720px) {
    .cp-panel {
        left: 2% !important;
        right: 2% !important;
        bottom: 2% !important;
        top: auto !important;
        width: 96% !important;
        max-height: 75vh;
        border-radius: 14px 14px 8px 8px;
        /* Override slide direction for bottom-sheet style */
        transform: translateY(20px);
    }
    .cp-panel--visible {
        transform: translateY(0);
    }

    .cp-header {
        padding: 1rem 1.2rem 0.4rem;
    }
    .cp-body {
        padding: 0.4rem 1.2rem 0.8rem;
    }
    .cp-footer {
        padding: 0.5rem 1.2rem 0.8rem;
    }
}

/* ── Touch device helpers ───────────────────────────────────────────────── */

@media (hover: none) and (pointer: coarse) {
    .cp-btn {
        padding: 0.65em 1.6em;
        font-size: 1em;
        /* Larger touch target on touch devices */
        min-height: 44px;
    }
    .cp-body {
        /* Prevent rubber-band scrolling leaking to body */
        overscroll-behavior: contain;
    }
}

/* ── Safari / WebKit fixes ──────────────────────────────────────────────── */

@supports (-webkit-touch-callout: none) {
    .cp-panel--glass {
        /* Safari sometimes needs explicit background-clip */
        -webkit-background-clip: padding-box;
        background-clip: padding-box;
    }
    .cp-body--scrollable {
        /* Ensure momentum scrolling on iOS */
        -webkit-overflow-scrolling: touch;
    }
}

/* ── Reduced motion preference ──────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
    .cp-panel,
    .cp-backdrop {
        transition-duration: 0ms !important;
    }
}