/* ============================================================
   SAISHI.CSS v3.0 - 赛事/文章/APP 页面专属样式
   ============================================================
   匹配 Section 模板:
   - ArticleSection (单文章详情)
   - AppHeroSection / AppQrSection / AppInstallSection / AppShowcaseSection
   - ContactChannelsSection / ContactFormSection / ContactQuickSection / ContactCommitmentsSection
   - LoginFormSection / SignupFormSection
   - SearchBoxSection (extends)
   - 滚动条 / 打印样式 / 图标
   ============================================================ */

:root{
    --color-primary:#6d28d9;
    --color-primary-dark:#5b21b6;
    --color-primary-darker:#3b0764;

    --color-accent:#0ea5e9;
    --color-accent-dark:#0284c7;

    --color-text:#0f172a;
    --color-text-muted:#334155;

    --color-bg:#f7f9ff;
    --color-bg-soft:#f2f6ff;
    --color-bg-muted:#eef2ff;

    --color-border:rgba(109,40,217,.22);
    --color-border-soft:rgba(15,23,42,.10);

    --color-danger:#dc2626;

    --radius-md:18px;
    --space-xs:12px;
    --space-sm:16px;
    --space-md:24px;

    --transition-fast:160ms;
    --transition-base:220ms;
    --transition-slow:520ms;

    --shadow-sm: 0 10px 22px rgba(109,40,217,.10), 0 2px 6px rgba(2,132,199,.08);
    --shadow-md: 0 14px 34px rgba(15,23,42,.10), 0 4px 10px rgba(109,40,217,.10);
    --shadow-lg: 0 22px 60px rgba(15,23,42,.14), 0 10px 24px rgba(109,40,217,.14);
    --shadow-primary: 0 18px 40px rgba(14,165,233,.18), 0 8px 18px rgba(109,40,217,.14);

    --gradient-hero: radial-gradient(1200px 520px at 20% 20%, rgba(14,165,233,.35) 0%, rgba(14,165,233,0) 55%),
                      radial-gradient(900px 460px at 80% 10%, rgba(109,40,217,.45) 0%, rgba(109,40,217,0) 58%),
                      linear-gradient(135deg, #eef2ff 0%, #f8fafc 55%, #eff6ff 100%);
    --gradient-icon: linear-gradient(180deg, rgba(109,40,217,.95) 0%, rgba(14,165,233,.92) 100%);
}

/* ============================================
   1. Single Post (ArticleSection)
   ============================================ */
.single-post {
    overflow: hidden;
}

.single-post .post-meta {
    font-size: 0.9rem;
}

.single-post .post-meta i {
    color: var(--color-primary);
}

.post-content {
    line-height: 1.8;
    font-size: 1.05rem;
    color: var(--color-text);
}

.post-content :is(h2, h3, h4) {
    margin-block: 2rem 1rem;
    font-weight: 700;
    color: var(--color-primary-darker);
    line-height: 1.4;
}

.post-content h2 {
    font-size: 1.75rem;
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid rgba(109,40,217,.28);
    border-radius: 10px;
}

.post-content h3 {
    font-size: 1.35rem;
}

.post-content :is(p, li) {
    margin-bottom: var(--space-sm);
}

.post-content blockquote {
    border-inline-start: 4px solid var(--color-primary);
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(135deg, rgba(109,40,217,.10) 0%, rgba(14,165,233,.08) 100%);
    border-radius: 0 22px 22px 0;
    margin-block: var(--space-md);
    color: var(--color-text-muted);
    font-style: italic;
    box-shadow: 0 18px 44px rgba(109,40,217,.08), 0 2px 8px rgba(2,132,199,.07);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 18px;
    margin-block: var(--space-sm);
    box-shadow: 0 24px 70px rgba(109,40,217,.14), 0 10px 26px rgba(15,23,42,.10), 0 2px 8px rgba(2,132,199,.10);
    transition: transform var(--transition-slow) ease, box-shadow var(--transition-base) ease, filter var(--transition-base) ease;
    filter: saturate(1.02);
}

.post-content a {
    color: var(--color-primary);
    text-decoration: underline;
    transition: color var(--transition-fast) cubic-bezier(.2,.8,.2,1), text-shadow var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

.post-content a:hover {
    color: var(--color-primary-dark);
    text-shadow: 0 8px 22px rgba(109,40,217,.25);
}

.post-content ul,
.post-content ol {
    padding-inline-start: 1.5rem;
}

.post-content code {
    background: linear-gradient(180deg, rgba(238,242,255,.95) 0%, rgba(244,247,255,.95) 100%);
    padding: 2px 6px;
    border-radius: 8px;
    font-size: 0.9em;
    color: #b91c1c;
    box-shadow: inset 0 0 0 1px rgba(145,20,20,.10), 0 10px 24px rgba(220,38,38,.08);
}

.post-content pre {
    background: radial-gradient(900px 280px at 20% 0%, rgba(14,165,233,.22) 0%, rgba(14,165,233,0) 55%),
                radial-gradient(720px 240px at 80% 20%, rgba(109,40,217,.28) 0%, rgba(109,40,217,0) 60%),
                linear-gradient(180deg, var(--color-primary-darker) 0%, #2a0a4c 100%);
    color: #fff;
    padding: var(--space-md);
    border-radius: 20px;
    overflow-x: auto;
    margin-block: var(--space-md);
    box-shadow: 0 28px 80px rgba(59,7,100,.24), 0 10px 26px rgba(0,0,0,.22);
    outline: 1px solid rgba(255,255,255,.08);
}

.post-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin-block: var(--space-md);
}

.post-content table th,
.post-content table td {
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid rgba(109,40,217,.18);
    text-align: start;
}

.post-content table th {
    background: linear-gradient(180deg, rgba(238,242,255,.95) 0%, rgba(242,246,255,.98) 100%);
    font-weight: 600;
    color: #1f2937;
    box-shadow: inset 0 0 0 1px rgba(109,40,217,.06);
}

/* TOC */
.toc-box {
    border-inline-start: 3px solid rgba(109,40,217,.9);
}

.toc-box ol {
    padding-inline-start: 1.2rem;
}

.toc-box ol li {
    margin: 0.4rem 0;
}

.toc-box ol li a {
    transition: color var(--transition-fast) cubic-bezier(.2,.8,.2,1), padding-inline-start var(--transition-fast) cubic-bezier(.2,.8,.2,1), text-decoration-color var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    text-decoration-color: rgba(109,40,217,.55);
}

.toc-box ol li a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline !important;
    padding-inline-start: 4px;
    text-shadow: 0 10px 26px rgba(109,40,217,.18);
}

/* Tags */
.post-tags .badge {
    background: rgba(238,242,255,.9) !important;
    color: #334155 !important;
    padding: 6px 12px;
    font-weight: 500;
    transition: background-color var(--transition-fast) cubic-bezier(.2,.8,.2,1), color var(--transition-fast) cubic-bezier(.2,.8,.2,1), transform var(--transition-fast) cubic-bezier(.2,.8,.2,1), box-shadow var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    border-radius: 999px;
    box-shadow: 0 10px 24px rgba(109,40,217,.08), inset 0 0 0 1px rgba(109,40,217,.10);
}

.post-tags .badge:hover {
    background: linear-gradient(180deg, rgba(109,40,217,.98) 0%, rgba(91,33,182,.98) 100%) !important;
    color: #fff !important;
    transform: translateY(-1px);
    box-shadow: 0 18px 46px rgba(109,40,217,.24), 0 6px 16px rgba(14,165,233,.16);
}

/* Post nav */
.post-nav {
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.post-nav .btn {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============================================
   2. App Hero (AppHeroSection)
   ============================================ */
.app-hero-section {
    background: var(--gradient-hero);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.app-hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(1200px 600px at 15% 20%, rgba(14,165,233,.25) 0%, rgba(14,165,233,0) 55%),
        radial-gradient(900px 520px at 85% 0%, rgba(109,40,217,.35) 0%, rgba(109,40,217,0) 58%),
        rgba(3, 7, 18, 0.10);
    z-index: 0;
}

.app-hero-section > .container {
    position: relative;
    z-index: 1;
}

.app-hero-section h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.2;
    text-shadow: 0 18px 52px rgba(0,0,0,.22), 0 2px 10px rgba(109,40,217,.18);
}

.app-hero-section img {
    transition: transform 520ms cubic-bezier(.2,.8,.2,1), filter 220ms cubic-bezier(.2,.8,.2,1);
    filter: drop-shadow(0 22px 48px rgba(2,132,199,0.26)) drop-shadow(0 10px 22px rgba(109,40,217,0.20));
    border-radius: 22px;
}

.app-hero-section img:hover {
    transform: translateY(-10px);
    filter: drop-shadow(0 28px 60px rgba(2,132,199,0.30)) drop-shadow(0 14px 30px rgba(109,40,217,0.24));
}

.text-white-50 {
    color: rgba(255, 255, 255, 0.70) !important;
}

/* ============================================
   3. App QR (AppQrSection)
   ============================================ */
.app-qr-section {
    background: var(--color-bg-soft);
}

.qr-card {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms cubic-bezier(.2,.8,.2,1), border-color 220ms cubic-bezier(.2,.8,.2,1), background-color 220ms cubic-bezier(.2,.8,.2,1);
    border: 2px solid transparent;
    border-radius: 24px;
    box-shadow: 0 14px 36px rgba(15,23,42,.08), inset 0 0 0 1px rgba(109,40,217,.08);
    background: rgba(255,255,255,.55);
    backdrop-filter: blur(10px);
}

.qr-card:hover {
    transform: translateY(-2px) scale(1.03);
    border-color: rgba(14,165,233,.95);
    box-shadow: 0 24px 70px rgba(2,132,199,.22), 0 18px 50px rgba(109,40,217,.14), 0 6px 16px rgba(15,23,42,.12);
}

.qr-card img {
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    border-radius: 18px;
}

/* ============================================
   4. App Install Steps (AppInstallSection)
   ============================================ */
.app-install-section {
    background: var(--color-bg-soft);
}

.app-install-section .badge.rounded-circle {
    width: 50px;
    height: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 999px;
    color: #fff;
    background: linear-gradient(180deg, rgba(109,40,217,.98) 0%, rgba(14,165,233,.92) 100%);
    box-shadow: 0 18px 46px rgba(109,40,217,.22), 0 10px 26px rgba(14,165,233,.16);
    outline: 1px solid rgba(255,255,255,.18);
}

.app-install-section .bg-white {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms cubic-bezier(.2,.8,.2,1), border-color 220ms cubic-bezier(.2,.8,.2,1);
    position: relative;
    overflow: hidden;
    border-radius: 24px;
    border: 1px solid rgba(109,40,217,.10);
    box-shadow: 0 16px 50px rgba(15,23,42,.08);
    background: linear-gradient(180deg, rgba(255,255,255,.78) 0%, rgba(255,255,255,.58) 100%);
}

.app-install-section .bg-white:hover {
    transform: translateY(-5px);
    box-shadow: 0 26px 80px rgba(109,40,217,.18), 0 16px 48px rgba(14,165,233,.14);
}

.app-install-section .bg-white::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-icon);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition-base) cubic-bezier(.2,.8,.2,1), filter var(--transition-base) cubic-bezier(.2,.8,.2,1);
    filter: saturate(1.08) contrast(1.03);
    opacity: .95;
}

.app-install-section .bg-white:hover::before {
    transform: scaleY(1);
}

/* ============================================
   5. App Showcase (AppShowcaseSection)
   ============================================ */
.app-showcase-section {
    background: var(--color-bg);
}

.app-showcase-section img {
    transition: transform 520ms cubic-bezier(.2,.8,.2,1), filter 220ms cubic-bezier(.2,.8,.2,1);
    filter: drop-shadow(0 18px 40px rgba(109,40,217,.18)) drop-shadow(0 8px 20px rgba(2,132,199,.14));
    border-radius: 22px;
}

.app-showcase-section img:hover {
    transform: translateY(-5px) rotate(-1deg);
    filter: drop-shadow(0 26px 64px rgba(109,40,217,.22)) drop-shadow(0 12px 26px rgba(2,132,199,.18));
}

.app-showcase-section .bg-white {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms cubic-bezier(.2,.8,.2,1), border-color 220ms cubic-bezier(.2,.8,.2,1);
    border-inline-start: 3px solid transparent;
    border-radius: 24px;
    border: 1px solid rgba(109,40,217,.10);
    box-shadow: 0 16px 46px rgba(15,23,42,.07);
    background: linear-gradient(180deg, rgba(255,255,255,.80) 0%, rgba(255,255,255,.58) 100%);
}

.app-showcase-section .bg-white:hover {
    border-inline-start-color: rgba(109,40,217,.92);
    transform: translateX(5px);
    box-shadow: 0 26px 82px rgba(109,40,217,.16), 0 18px 52px rgba(2,132,199,.12);
}

/* ============================================
   6. Contact Sections
   ============================================ */
.contact-channels-section {
    background: var(--color-bg);
}

.contact-channels-section article {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms cubic-bezier(.2,.8,.2,1), border-color 220ms cubic-bezier(.2,.8,.2,1), background-color 220ms cubic-bezier(.2,.8,.2,1);
    border: 1px solid var(--color-border-soft);
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(255,255,255,.80) 0%, rgba(255,255,255,.55) 100%);
    box-shadow: 0 14px 40px rgba(15,23,42,.06);
    backdrop-filter: blur(10px);
}

.contact-channels-section article:hover {
    transform: translateY(-5px);
    box-shadow: 0 28px 90px rgba(109,40,217,.18), 0 14px 44px rgba(15,23,42,.12);
    border-color: rgba(109,40,217,.55);
}

.contact-channels-section article ul li {
    transition: padding var(--transition-fast) cubic-bezier(.2,.8,.2,1), color var(--transition-fast) cubic-bezier(.2,.8,.2,1);
}

.contact-channels-section article ul li:hover {
    padding-inline-start: 4px;
    color: rgba(59,7,100,.98);
}

/* Contact Quick */
.contact-quick-section {
    background: var(--color-bg-soft);
}

.contact-quick-section .contact-card {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms cubic-bezier(.2,.8,.2,1), border-color 220ms cubic-bezier(.2,.8,.2,1);
    border-radius: 24px;
    border: 1px solid rgba(109,40,217,.10);
    background: linear-gradient(180deg, rgba(255,255,255,.78) 0%, rgba(255,255,255,.56) 100%);
    box-shadow: 0 16px 48px rgba(15,23,42,.07);
    backdrop-filter: blur(10px);
}

.contact-quick-section .contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 28px 90px rgba(14,165,233,.16), 0 18px 60px rgba(109,40,217,.14);
}

.contact-quick-section .contact-card i {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), color 160ms cubic-bezier(.2,.8,.2,1);
    color: rgba(109,40,217,.92);
    text-shadow: 0 10px 26px rgba(109,40,217,.20);
}

.contact-quick-section .contact-card:hover i {
    transform: scale(1.1) rotate(-5deg);
    color: rgba(14,165,233,.98);
    text-shadow: 0 18px 46px rgba(14,165,233,.22);
}

/* Contact Form */
.contact-form-section {
    background: var(--color-bg-soft);
}

.contact-form-section .form-control,
.contact-form-section .form-select {
    border: 2px solid rgba(109,40,217,.22);
    transition: border-color var(--transition-fast) cubic-bezier(.2,.8,.2,1), box-shadow var(--transition-fast) cubic-bezier(.2,.8,.2,1), background-color var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    border-radius: 18px;
    background: rgba(255,255,255,.70);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.16);
}

.contact-form-section .form-control:focus,
.contact-form-section .form-select:focus {
    border-color: rgba(109,40,217,.78);
    box-shadow: 0 0 0 0.2rem rgba(14,165,233,.14), 0 20px 60px rgba(109,40,217,.10);
    background: rgba(255,255,255,.88);
}

.contact-form-section button[type="submit"] {
    transition: transform var(--transition-base) cubic-bezier(.2,.8,.2,1), box-shadow var(--transition-base) cubic-bezier(.2,.8,.2,1), background-color var(--transition-base) cubic-bezier(.2,.8,.2,1), border-color var(--transition-base) cubic-bezier(.2,.8,.2,1), color var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    border-radius: 18px;
}

.contact-form-section button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 26px 80px rgba(14,165,233,.16), 0 18px 56px rgba(109,40,217,.14);
}

/* Contact Commitments */
.contact-commitments-section {
    background: var(--color-bg-soft);
}

.contact-commitments-section .bg-white {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms cubic-bezier(.2,.8,.2,1);
    text-align: center;
    border-radius: 24px;
    border: 1px solid rgba(109,40,217,.10);
    background: linear-gradient(180deg, rgba(255,255,255,.80) 0%, rgba(255,255,255,.58) 100%);
    box-shadow: 0 16px 46px rgba(15,23,42,.07);
    backdrop-filter: blur(10px);
}

.contact-commitments-section .bg-white:hover {
    transform: translateY(-5px);
    box-shadow: 0 28px 90px rgba(109,40,217,.16), 0 18px 60px rgba(2,132,199,.12);
}

.contact-commitments-section .bg-white i {
    transition: transform 220ms cubic-bezier(.2,.8,.2,1), color 160ms cubic-bezier(.2,.8,.2,1);
    color: rgba(14,165,233,.95);
    text-shadow: 0 14px 38px rgba(14,165,233,.20);
}

.contact-commitments-section .bg-white:hover i {
    transform: scale(1.15);
    color: rgba(109,40,217,.95);
    text-shadow: 0 18px 50px rgba(109,40,217,.22);
}

/* ============================================
   7. Login / Signup Forms
   ============================================ */
main:has(> .container > .bg-white > form) .input-group-text {
    background-color: var(--color-bg-muted);
    border-color: rgba(109,40,217,.26);
    border-inline-end: none;
    border-radius: 16px;
    color: rgba(59,7,100,.95);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.18);
}

main:has(> .container > .bg-white > form) .input-group .form-control {
    border-inline-start: none;
}

main:has(> .container > .bg-white > form) .input-group:focus-within .input-group-text {
    border-color: rgba(109,40,217,.78);
    background-color: rgba(239,246,255,.95);
    box-shadow: 0 18px 52px rgba(14,165,233,.12), inset 0 0 0 1px rgba(255,255,255,.20);
}

main:has(> .container > .bg-white > form) .input-group:focus-within .form-control {
    border-color: rgba(109,40,217,.70);
}

main:has(> .container > .bg-white > form) .form-check-input:checked {
    background-color: rgba(109,40,217,.95);
    border-color: rgba(109,40,217,.95);
    box-shadow: 0 18px 50px rgba(109,40,217,.22);
}

main:has(> .container > .bg-white > form) button[type="submit"] {
    transition: transform var(--transition-base) cubic-bezier(.2,.8,.2,1), box-shadow var(--transition-base) cubic-bezier(.2,.8,.2,1), background-color var(--transition-base) cubic-bezier(.2,.8,.2,1), color var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    font-weight: 600;
    border-radius: 18px;
}

main:has(> .container > .bg-white > form) button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 26px 80px rgba(109,40,217,.18), 0 18px 56px rgba(14,165,233,.12);
}

/* ============================================
   8. Icons
   ============================================ */
.icon-img {
    max-width: 32px;
    max-height: 32px;
    object-fit: contain;
}

.icon-emoji {
    display: inline-block;
    line-height: 1;
    text-shadow: 0 12px 30px rgba(109,40,217,.14);
}

/* ============================================
   9. Hero Buttons (đã có ở theme.css nhưng bổ sung thêm)
   ============================================ */
.hero-buttons .btn {
    transition: transform var(--transition-base) cubic-bezier(.2,.8,.2,1), box-shadow var(--transition-base) cubic-bezier(.2,.8,.2,1), background-color var(--transition-base) cubic-bezier(.2,.8,.2,1), border-color var(--transition-base) cubic-bezier(.2,.8,.2,1), color var(--transition-fast) cubic-bezier(.2,.8,.2,1);
    border-radius: 999px;
}

.hero-buttons .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 26px 82px rgba(109,40,217,.18), 0 18px 60px rgba(14,165,233,.12);
}

.hero-buttons .btn-warning {
    background-color: var(--color-accent);
    border-color: rgba(14,165,233,.95);
    color: var(--color-primary-darker);
    font-weight: 600;
    box-shadow: 0 18px 48px rgba(14,165,233,.22), 0 10px 26px rgba(109,40,217,.14);
}

.hero-buttons .btn-warning:hover {
    background-color: var(--color-accent-dark);
    border-color: rgba(2,132,199,.95);
}

.hero-buttons .btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: #fff;
    box-shadow: 0 18px 60px rgba(255,255,255,.16), 0 18px 50px rgba(109,40,217,.12);
}

/* ============================================
   10. 自定义滚动条
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(238,242,255,.85);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(109,40,217,.65) 0%, rgba(14,165,233,.60) 100%);
    border-radius: 5px;
    outline: 1px solid rgba(255,255,255,.28);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.10);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(91,33,182,.85) 0%, rgba(2,132,199,.78) 100%);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(109,40,217,.72) rgba(238,242,255,.85);
}

/* ============================================
   11. Print Styles
   ============================================ */
@media print {
    :is(.header,
        .footer,
        .sidebar-widgets,
        .social-share,
        #back-to-top,
        .breadcrumb-nav,
        .notice-bar,
        .cta-banner-section,
        .post-nav,
        .related-posts,
        .author-box,
        .pagination,
        .navbar-toggler,
        .nav-item) {
        display: none !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
        font-size: 12pt;
    }

    .single-post {
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
        max-width: 100% !important;
    }

    .post-content {
        font-size: 11pt;
        line-height: 1.6;
    }

    a {
        text-decoration: underline;
        color: #000 !important;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 9pt;
        color: #555;
    }

    a[href^="#"]::after,
    a[href^="javascript:"]::after,
    a[href^="mailto:"]::after,
    a[href^="tel:"]::after {
        content: "";
    }

    .post-content img {
        max-width: 100% !important;
        page-break-inside: avoid;
        box-shadow: none !important;
        border-radius: 0 !important;
    }

    :is(h1, h2, h3, h4) {
        page-break-after: avoid;
        color: #000 !important;
    }

    p, li {
        orphans: 3;
        widows: 3;
    }
}

/* ============================================
   12. Animations bổ sung
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.055);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.6s ease-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ============================================
   13. Responsive
   ============================================ */
@media (max-width: 991.98px) {
    .post-content {
        font-size: 1rem;
    }

    .post-content h2 {
        font-size: 1.5rem;
    }

    .post-content h3 {
        font-size: 1.2rem;
    }
}

@media (max-width: 767.98px) {
    .single-post {
        padding: var(--space-md) !important;
    }

    .post-content {
        font-size: 0.95rem;
    }

    .post-content h2 {
        font-size: 1.35rem;
    }

    .post-nav {
        flex-direction: column;
    }

    .post-nav .btn {
        width: 100%;
    }

    .post-tags .badge {
        font-size: 0.8rem;
        padding: 4px 8px;
    }

    .app-hero-section h1 {
        font-size: 1.75rem;
    }

    .app-install-section .badge.rounded-circle {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .toc-box {
        padding: var(--space-sm) !important;
    }

    .qr-card img {
        max-width: 140px !important;
        border-radius: 16px;
    }
}

@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
        filter: saturate(1.03);
        text-shadow: 0 1px 0 rgba(0, 0, 0, 0.05), 0 10px 28px rgba(36, 99, 235, 0.12);
        caret-color: rgba(17, 24, 39, 0.85);
        accent-color: rgba(59, 130, 246, 0.95);
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        border-radius: 999px;
        outline: 1px solid rgba(255, 255, 255, 0.35);
        outline-offset: 2px;
        box-shadow:
            0 10px 28px rgba(245, 158, 11, 0.22),
            0 2px 8px rgba(245, 158, 11, 0.16),
            inset 0 1px 0 rgba(255, 255, 255, 0.55);
        transition:
            background-color 220ms cubic-bezier(0.2, 0.8, 0.2, 1),
            box-shadow 220ms cubic-bezier(0.2, 0.8, 0.2, 1),
            transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
        opacity: 0.98;
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        border-radius: 22px;
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, rgba(241, 245, 249, 0.78) 100%);
        box-shadow:
            0 18px 46px rgba(15, 23, 42, 0.12),
            0 8px 20px rgba(59, 130, 246, 0.10),
            0 1px 0 rgba(255, 255, 255, 0.65) inset;
        text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
        transition:
            box-shadow 260ms cubic-bezier(0.2, 0.9, 0.2, 1),
            transform 260ms cubic-bezier(0.2, 0.9, 0.2, 1),
            background 260ms cubic-bezier(0.2, 0.9, 0.2, 1);
        backdrop-filter: blur(10px) saturate(1.05);
        -webkit-backdrop-filter: blur(10px) saturate(1.05);
        opacity: 0.98;
        outline: 1px solid rgba(148, 163, 184, 0.22);
        outline-offset: 0;
    }
}