/**
 * Single APK Suite - Core Layout & Royal Black + Royal Red Glassmorphism System
 *
 * Provides foundational layout, typography, glassmorphism hierarchy,
 * accessible focus states, button tokens, and editorial prose styling.
 *
 * @package Single_APK_Suite
 * @since 1.0.0
 */

/* ------------------------------------------------------------------------- *
 * Layout Containers & Scaffolding
 * ------------------------------------------------------------------------- */
.single-apk-container {
    width: 100%;
    max-width: var(--single-apk-container-width, 1200px);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--single-apk-container-padding, 1.5rem);
    padding-right: var(--single-apk-container-padding, 1.5rem);
    position: relative;
    z-index: 1;
}

@media (max-width: 600px) {
    .single-apk-container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

.single-apk-container--narrow {
    max-width: 860px;
}

.single-apk-container--prose {
    max-width: 840px;
}

.site-main {
    flex: 1 0 auto;
    padding-top: 2rem;
    padding-bottom: 5rem;
    position: relative;
    z-index: 1;
    overflow-x: hidden;
    width: 100%;
    max-width: 100%;
}

/* ------------------------------------------------------------------------- *
 * Typography Scale
 * ------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--single-apk-font-heading, inherit);
    color: var(--single-apk-color-text, #f8fafc);
    line-height: 1.25;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 4.5vw, 3.25rem); }
h2 { font-size: clamp(1.65rem, 3.2vw, 2.15rem); }
h3 { font-size: clamp(1.25rem, 2.4vw, 1.5rem); }
h4 { font-size: 1.15rem; font-weight: 600; }

p {
    margin-bottom: 1.35rem;
    color: var(--single-apk-color-text-muted, #94a3b8);
    line-height: 1.75;
    font-size: 1rem;
}

a {
    color: var(--single-apk-color-primary, #e11d48);
    text-decoration: none;
    transition: color var(--single-apk-transition);
}

a:hover, a:focus-visible {
    color: var(--single-apk-color-primary-hover, #f43f5e);
}

/* Focus Visibility for Accessibility */
:focus-visible {
    outline: 2px solid var(--single-apk-color-primary, #e11d48);
    outline-offset: 3px;
}

/* ------------------------------------------------------------------------- *
 * Glassmorphism System (Level 1 - Level 4)
 * ------------------------------------------------------------------------- */
.single-apk-glass-card {
    background-color: var(--single-apk-glass-base, rgba(15, 18, 25, 0.75));
    backdrop-filter: blur(var(--single-apk-glass-blur, 14px));
    -webkit-backdrop-filter: blur(var(--single-apk-glass-blur, 14px));
    border: 1px solid var(--single-apk-glass-border, rgba(255, 255, 255, 0.08));
    border-radius: var(--single-apk-radius-md, 14px);
    box-shadow: var(--single-apk-shadow-glass);
    transition: border-color var(--single-apk-transition), box-shadow var(--single-apk-transition), transform var(--single-apk-transition);
}

.single-apk-glass-card:hover {
    border-color: var(--single-apk-glass-border-hover, rgba(225, 29, 72, 0.35));
}

.single-apk-glass-card--elevated {
    background-color: var(--single-apk-glass-elevated, rgba(22, 26, 36, 0.85));
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.08);
}

/* Low-End Fallback for browsers without backdrop-filter */
@supports not (backdrop-filter: blur(10px)) {
    .single-apk-glass-card,
    .single-apk-glass-card--elevated {
        background-color: #10131b !important;
    }
}

/* ------------------------------------------------------------------------- *
 * Buttons & CTA Tokens
 * ------------------------------------------------------------------------- */
.single-apk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    padding: 0.85rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--single-apk-radius-md, 14px);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.2;
    transition: background-color var(--single-apk-transition), transform var(--single-apk-transition), box-shadow var(--single-apk-transition), border-color var(--single-apk-transition);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Royal Red Primary CTA */
.single-apk-btn--primary {
    background: linear-gradient(135deg, #e11d48 0%, #be123c 100%);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--single-apk-shadow-red);
}

.single-apk-btn--primary:hover, .single-apk-btn--primary:focus-visible {
    background: linear-gradient(135deg, #f43f5e 0%, #e11d48 100%);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(225, 29, 72, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
}

.single-apk-btn--primary:active {
    transform: translateY(0);
    box-shadow: 0 3px 12px rgba(225, 29, 72, 0.4);
}

/* Secondary Glass Button */
.single-apk-btn--glass {
    background: rgba(255, 255, 255, 0.04);
    color: var(--single-apk-color-text, #f8fafc);
    border-color: var(--single-apk-glass-border, rgba(255, 255, 255, 0.08));
    backdrop-filter: blur(8px);
}

.single-apk-btn--glass:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    transform: translateY(-1px);
}

/* ------------------------------------------------------------------------- *
 * SVG Icon Alignment
 * ------------------------------------------------------------------------- */
.single-apk-icon {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}

.single-apk-rotate-180 {
    transform: rotate(180deg);
}

/* ------------------------------------------------------------------------- *
 * Breadcrumbs
 * ------------------------------------------------------------------------- */
.single-apk-breadcrumbs {
    margin-bottom: 2rem;
    font-size: 0.875rem;
}

.single-apk-breadcrumbs__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    padding: 0.5rem 1rem;
    margin: 0;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--single-apk-color-border, rgba(255, 255, 255, 0.06));
    border-radius: var(--single-apk-radius-full, 9999px);
    width: fit-content;
}

.single-apk-breadcrumbs__separator {
    color: var(--single-apk-color-text-dim, #64748b);
    font-size: 0.75rem;
}

.single-apk-breadcrumbs__item a {
    color: var(--single-apk-color-text-muted, #94a3b8);
    transition: color var(--single-apk-transition);
}

.single-apk-breadcrumbs__item a:hover {
    color: var(--single-apk-color-text, #f8fafc);
}

.single-apk-breadcrumbs__item--current {
    color: var(--single-apk-color-primary, #e11d48);
    font-weight: 500;
}

/* ------------------------------------------------------------------------- *
 * Editorial Description & Long-Form Reading Typography (Section 15, 16, 17)
 * ------------------------------------------------------------------------- */
.single-apk-editorial-card {
    background-color: var(--single-apk-glass-base, rgba(15, 18, 25, 0.75));
    backdrop-filter: blur(var(--single-apk-glass-blur, 14px));
    -webkit-backdrop-filter: blur(var(--single-apk-glass-blur, 14px));
    border: 1px solid var(--single-apk-glass-border, rgba(255, 255, 255, 0.08));
    border-radius: var(--single-apk-radius-lg, 20px);
    padding: clamp(1.5rem, 3.5vw, 3rem);
    box-shadow: var(--single-apk-shadow-glass);
    width: 100%;
    max-width: 100%;
    overflow: hidden;
}

@media (max-width: 600px) {
    .single-apk-editorial-card {
        padding: 1.25rem 1rem;
        border-radius: 14px;
    }
}

.entry-content,
.single-apk-prose {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--single-apk-color-text-muted, #94a3b8);
    width: 100%;
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
}

.entry-content > *,
.single-apk-prose > * {
    max-width: 100%;
}

.entry-content img,
.single-apk-prose img {
    max-width: 100% !important;
    height: auto !important;
    border-radius: 8px;
}

.entry-content pre,
.single-apk-prose pre {
    max-width: 100%;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.entry-content h2,
.single-apk-prose h2 {
    color: var(--single-apk-color-text, #f8fafc);
    font-size: clamp(1.5rem, 2.6vw, 1.875rem);
    font-weight: 700;
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    position: relative;
    padding-left: 1rem;
    border-left: 3px solid var(--single-apk-color-primary, #e11d48);
}

.entry-content h3,
.single-apk-prose h3 {
    color: var(--single-apk-color-text, #f8fafc);
    font-size: clamp(1.25rem, 2vw, 1.45rem);
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.85rem;
}

.entry-content ul,
.single-apk-prose ul {
    list-style: none;
    padding-left: 0;
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.entry-content ul li,
.single-apk-prose ul li {
    position: relative;
    padding-left: 1.75rem;
}

.entry-content ul li::before,
.single-apk-prose ul li::before {
    content: '';
    position: absolute;
    left: 0.25rem;
    top: 0.65rem;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--single-apk-color-primary, #e11d48);
}

.entry-content ol,
.single-apk-prose ol {
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.entry-content blockquote,
.single-apk-prose blockquote {
    margin: 2rem 0;
    padding: 1.25rem 1.75rem;
    background: rgba(225, 29, 72, 0.05);
    border-left: 4px solid var(--single-apk-color-primary, #e11d48);
    border-radius: 0 var(--single-apk-radius-sm, 8px) var(--single-apk-radius-sm, 8px) 0;
    font-style: italic;
    color: var(--single-apk-color-text, #f8fafc);
}

/* Callout Boxes (Section 18) */
.single-apk-callout {
    display: flex;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-radius: var(--single-apk-radius-md, 14px);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--single-apk-color-border, rgba(255, 255, 255, 0.08));
    font-size: 0.9375rem;
}

.single-apk-callout--note {
    border-left: 4px solid var(--single-apk-color-info, #38bdf8);
    background: rgba(56, 189, 248, 0.04);
}

.single-apk-callout--warning {
    border-left: 4px solid var(--single-apk-color-warning, #f59e0b);
    background: rgba(245, 158, 11, 0.04);
}

.single-apk-callout--highlight {
    border-left: 4px solid var(--single-apk-color-primary, #e11d48);
    background: rgba(225, 29, 72, 0.05);
}

.single-apk-callout--req {
    border-left: 4px solid var(--single-apk-color-secondary, #10b981);
    background: rgba(16, 185, 129, 0.04);
}

.single-apk-callout__icon {
    flex-shrink: 0;
    color: var(--single-apk-color-primary, #e11d48);
    margin-top: 0.2rem;
}

.single-apk-callout--note .single-apk-callout__icon { color: var(--single-apk-color-info, #38bdf8); }
.single-apk-callout--warning .single-apk-callout__icon { color: var(--single-apk-color-warning, #f59e0b); }
.single-apk-callout--req .single-apk-callout__icon { color: var(--single-apk-color-secondary, #10b981); }

.single-apk-callout__content p {
    margin: 0;
    font-size: 0.9375rem;
}

.single-apk-callout__title {
    font-weight: 700;
    color: var(--single-apk-color-text, #f8fafc);
    display: block;
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

/* Responsive Tables (Section 32) */
.entry-content table,
.single-apk-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.9375rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.entry-content th,
.single-apk-table th {
    background: rgba(225, 29, 72, 0.08);
    color: var(--single-apk-color-text, #f8fafc);
    padding: 0.85rem 1rem;
    text-align: left;
    font-weight: 600;
    border-bottom: 1px solid var(--single-apk-color-border, rgba(255, 255, 255, 0.1));
}

.entry-content td,
.single-apk-table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--single-apk-color-border-subtle, rgba(255, 255, 255, 0.04));
    color: var(--single-apk-color-text-muted, #94a3b8);
}

.entry-content tr:hover td,
.single-apk-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/* ------------------------------------------------------------------------- *
 * Ad Slots
 * ------------------------------------------------------------------------- */
.single-apk-ad-slot {
    margin: 2.5rem 0;
    display: flex;
    justify-content: center;
    overflow: hidden;
}

.single-apk-ad-slot__inner {
    max-width: 100%;
}

/* ------------------------------------------------------------------------- *
 * 404 Error Page & Empty States
 * ------------------------------------------------------------------------- */
.single-apk-error-404 {
    padding: 5rem 0;
    text-align: center;
}

.single-apk-error-card {
    background-color: var(--single-apk-glass-base, rgba(15, 18, 25, 0.75));
    backdrop-filter: blur(var(--single-apk-glass-blur, 14px));
    -webkit-backdrop-filter: blur(var(--single-apk-glass-blur, 14px));
    border: 1px solid var(--single-apk-glass-border, rgba(255, 255, 255, 0.08));
    border-radius: var(--single-apk-radius-lg, 20px);
    padding: 4rem 2rem;
    box-shadow: var(--single-apk-shadow-glass);
}

.single-apk-error-badge {
    display: inline-block;
    font-size: 5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    color: var(--single-apk-color-primary, #e11d48);
    line-height: 1;
    margin-bottom: 1rem;
    text-shadow: 0 0 40px rgba(225, 29, 72, 0.3);
}

.single-apk-error-desc {
    color: var(--single-apk-color-text-muted, #94a3b8);
    max-width: 500px;
    margin: 0 auto 2.5rem auto;
}

.single-apk-empty-state {
    padding: 3.5rem;
    text-align: center;
    background: rgba(15, 18, 25, 0.5);
    border: 1px dashed var(--single-apk-color-border, rgba(255, 255, 255, 0.08));
    border-radius: var(--single-apk-radius-md, 14px);
    color: var(--single-apk-color-text-muted, #94a3b8);
}

/* ------------------------------------------------------------------------- *
 * Screen Reader & Accessibility Utilities
 * ------------------------------------------------------------------------- */
.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute !important;
    width: 1px;
    word-wrap: normal !important;
}

/* ------------------------------------------------------------------------- *
 * Table of Contents (Clean, Minimalist & Compact UI/UX)
 * ------------------------------------------------------------------------- */
.single-apk-toc-wrapper {
    margin: 1.5rem 0;
    max-width: 480px;
}

.single-apk-toc-card {
    background: rgba(18, 22, 32, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 0.65rem 1rem;
    box-shadow: 0 4px 16px -2px rgba(0, 0, 0, 0.4);
    transition: border-color 0.2s ease;
}

/* Subtle, clean card hover without heavy glowing shadows */
.single-apk-toc-card:hover {
    border-color: rgba(255, 255, 255, 0.16);
    box-shadow: 0 4px 16px -2px rgba(0, 0, 0, 0.4);
}

.single-apk-toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
    padding: 0.15rem 0;
    border-radius: 6px;
}

.single-apk-toc-header:focus-visible {
    outline: 2px solid var(--single-apk-color-primary, #e11d48);
    outline-offset: 2px;
}

.single-apk-toc-header__main {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex: 1;
}

.single-apk-toc-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--single-apk-color-primary, #e11d48);
    box-shadow: none;
    flex-shrink: 0;
}

.single-apk-toc-icon svg {
    width: 14px;
    height: 14px;
}

.single-apk-toc-title {
    font-size: 0.925rem;
    font-weight: 600;
    color: #ffffff;
    letter-spacing: -0.01em;
}

.single-apk-toc-badge {
    display: none !important;
}

.single-apk-toc-toggle {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--single-apk-color-text-muted, #94a3b8);
    cursor: pointer;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s ease, color 0.2s ease;
    flex-shrink: 0;
    padding: 0;
}

.single-apk-toc-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    transform: none;
}

.single-apk-toc-toggle svg {
    width: 13px;
    height: 13px;
    transition: transform 0.2s ease;
}

.single-apk-toc-toggle[aria-expanded="false"] svg {
    transform: rotate(-90deg);
}

.single-apk-toc-nav {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.single-apk-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.single-apk-toc-item {
    margin: 0;
    padding: 0;
    list-style: none;
}

.single-apk-toc-item a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.45rem 0.65rem;
    border-radius: 6px;
    color: var(--single-apk-color-text-muted, #94a3b8);
    font-size: 0.865rem;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s ease, background-color 0.2s ease;
    border: none;
}

.single-apk-toc-num {
    font-size: 0.725rem;
    font-weight: 600;
    font-family: var(--single-apk-font-mono, monospace);
    color: var(--single-apk-color-primary, #e11d48);
    opacity: 0.85;
    min-width: 20px;
}

.single-apk-toc-text {
    flex: 1;
    line-height: 1.35;
}

/* Clean, understated hover - no big sliding indent, no heavy glowing fills */
.single-apk-toc-item a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.04);
}

/* Clean active item */
.single-apk-toc-item a.is-active {
    color: #ffffff;
    font-weight: 600;
    background: rgba(225, 29, 72, 0.08);
}

.single-apk-toc-item a.is-active .single-apk-toc-num {
    color: #ffffff;
}

/* H3 Sub-headings */
.single-apk-toc-item--h3 {
    margin-left: 1rem;
    border-left: 1px dashed rgba(255, 255, 255, 0.08);
}

.single-apk-toc-item--h3 a {
    font-size: 0.8125rem;
    padding: 0.35rem 0.5rem;
}

.single-apk-toc-item--h3 .single-apk-toc-num {
    display: none;
}

.single-apk-toc-item--h3 a::before {
    content: '↳';
    color: var(--single-apk-color-text-subtle, #64748b);
    font-size: 0.8rem;
    margin-right: -0.2rem;
}