/* ============================================================
   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
   ============================================================ */

/* ============================================
   1. Single Post (ArticleSection)
   ============================================ */
:root{
    --color-primary: #6d28d9;
    --color-primary-dark: #5b21b6;
    --color-primary-darker: #4c1d95;

    --color-text: #0f172a;
    --color-text-muted: #475569;

    --color-border: rgba(109, 40, 217, 0.22);
    --color-border-soft: rgba(109, 40, 217, 0.14);

    --color-bg: #f6f7fb;
    --color-bg-soft: rgba(109, 40, 217, 0.06);
    --color-bg-muted: rgba(148, 163, 184, 0.18);

    --color-accent: #14b8a6;
    --color-accent-dark: #0d9488;

    --gradient-hero: radial-gradient(1200px 600px at 10% 10%, rgba(109, 40, 217, 0.45) 0%, rgba(109, 40, 217, 0.18) 30%, rgba(255,255,255,0) 60%),
                    radial-gradient(900px 520px at 80% 20%, rgba(20, 184, 166, 0.35) 0%, rgba(20, 184, 166, 0.12) 30%, rgba(255,255,255,0) 62%),
                    linear-gradient(135deg, #f8fafc 0%, #eef2ff 45%, #ecfeff 100%);

    --gradient-icon: linear-gradient(180deg, rgba(20,184,166,1) 0%, rgba(109,40,217,1) 100%);

    --shadow-sm: 0 6px 18px rgba(15, 23, 42, 0.10), 0 2px 6px rgba(109, 40, 217, 0.10);
    --shadow-md: 0 18px 50px rgba(15, 23, 42, 0.12), 0 6px 16px rgba(109, 40, 217, 0.12);
    --shadow-lg: 0 26px 70px rgba(15, 23, 42, 0.14), 0 10px 26px rgba(109, 40, 217, 0.14);

    --shadow-primary: 0 22px 60px rgba(109, 40, 217, 0.22), 0 10px 24px rgba(20, 184, 166, 0.16);

    --transition-fast: 150ms;
    --transition-base: 220ms;
    --transition-slow: 500ms;

    --radius-md: 18px;
}

.single-post {
    overflow: hidden;
}

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

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

/* Post content typography */
.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, 0.28);
    text-shadow: 0 1px 0 rgba(255,255,255,0.7);
    border-radius: 12px;
}

.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(180deg, rgba(109, 40, 217, 0.08) 0%, rgba(20, 184, 166, 0.07) 100%);
    border-radius: 0 22px 22px 0;
    margin-block: var(--space-md);
    color: rgba(71, 85, 105, 0.95);
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08), 0 2px 10px rgba(109, 40, 217, 0.06);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 22px;
    margin-block: var(--space-sm);
    box-shadow: 0 18px 55px rgba(15, 23, 42, 0.14), 0 2px 10px rgba(109, 40, 217, 0.10);
}

.post-content a {
    color: var(--color-primary);
    text-decoration: underline;
    transition: color 180ms cubic-bezier(0.2, 0.9, 0.2, 1), text-shadow 180ms cubic-bezier(0.2, 0.9, 0.2, 1);
    text-underline-offset: 3px;
}

.post-content a:hover {
    color: var(--color-primary-dark);
    text-shadow: 0 10px 22px rgba(109, 40, 217, 0.25);
}

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

.post-content code {
    background: rgba(148, 163, 184, 0.22);
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 0.9em;
    color: #7c2d12;
    box-shadow: inset 0 0 0 1px rgba(124, 58, 237, 0.16);
}

.post-content pre {
    background: radial-gradient(800px 280px at 20% 0%, rgba(109, 40, 217, 0.40) 0%, rgba(76, 29, 149, 0.45) 40%, rgba(2, 6, 23, 0.92) 100%);
    color: rgba(255, 255, 255, 0.94);
    padding: var(--space-md);
    border-radius: 22px;
    overflow-x: auto;
    margin-block: var(--space-md);
    box-shadow: 0 30px 80px rgba(2, 6, 23, 0.35), 0 10px 24px rgba(109, 40, 217, 0.22);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.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, 0.16);
    text-align: start;
}

.post-content table th {
    background: linear-gradient(180deg, rgba(148, 163, 184, 0.18) 0%, rgba(109, 40, 217, 0.08) 100%);
    font-weight: 600;
    color: #0f172a;
}

/* TOC */
.toc-box {
    border-inline-start: 3px solid rgba(109, 40, 217, 0.75);
    border-radius: 2px;
}

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

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

.toc-box ol li a {
    transition: color 180ms cubic-bezier(0.2, 0.9, 0.2, 1), padding-inline-start 180ms cubic-bezier(0.2, 0.9, 0.2, 1), text-decoration-color 180ms ease;
    text-decoration-color: rgba(109, 40, 217, 0.35);
}

.toc-box ol li a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline !important;
    padding-inline-start: 6px;
}

/* Tags */
.post-tags .badge {
    background: rgba(148, 163, 184, 0.18) !important;
    color: rgba(15, 23, 42, 0.78) !important;
    padding: 6px 12px;
    font-weight: 500;
    transition: transform 220ms cubic-bezier(0.2, 0.9, 0.2, 1), background-color 220ms ease, box-shadow 220ms ease;
    border-radius: 999px;
    box-shadow: 0 8px 22px rgba(2, 6, 23, 0.06);
    border: 1px solid rgba(109, 40, 217, 0.10);
}

.post-tags .badge:hover {
    background: linear-gradient(180deg, rgba(109, 40, 217, 0.95) 0%, rgba(91, 33, 182, 0.95) 100%) !important;
    color: #fff !important;
    transform: translateY(-1px);
    box-shadow: 0 18px 44px rgba(109, 40, 217, 0.26), 0 6px 16px rgba(20, 184, 166, 0.14);
}

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

.post-nav .btn {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    border-radius: 999px;
    transition: transform 220ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 220ms ease, background-color 220ms ease, border-color 220ms ease;
}

/* ============================================
   2. App Hero (AppHeroSection)
   ============================================ */
.app-hero-section {
    background: var(--gradient-hero);
    color: #fff;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 -1px 0 rgba(255,255,255,0.55);
}

.app-hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(900px 420px at 70% 30%, rgba(255,255,255,0.35) 0%, rgba(0,0,0,0.0) 60%),
                linear-gradient(180deg, rgba(2, 6, 23, 0.18) 0%, rgba(2, 6, 23, 0.07) 40%, rgba(2, 6, 23, 0.15) 100%);
    z-index: 0;
    backdrop-filter: blur(2px);
    opacity: 0.9;
}

.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 40px rgba(2, 6, 23, 0.28);
}

.app-hero-section img {
    transition: transform 520ms cubic-bezier(0.2, 0.9, 0.2, 1), filter 520ms cubic-bezier(0.2, 0.9, 0.2, 1);
    filter: drop-shadow(0 22px 55px rgba(2, 6, 23, 0.34)) drop-shadow(0 8px 18px rgba(109, 40, 217, 0.22));
    border-radius: 24px;
}

.app-hero-section img:hover {
    transform: translateY(-10px) scale(1.01);
    filter: drop-shadow(0 28px 70px rgba(2, 6, 23, 0.40)) drop-shadow(0 12px 26px rgba(20, 184, 166, 0.22));
}

.text-white-50 {
    color: rgba(255, 255, 255, 0.68) !important;
    text-shadow: 0 10px 24px rgba(2, 6, 23, 0.22);
}

/* ============================================
   3. App QR (AppQrSection)
   ============================================ */
.app-qr-section {
    background: radial-gradient(900px 500px at 20% 0%, rgba(109, 40, 217, 0.08) 0%, rgba(255,255,255,0) 55%),
                linear-gradient(180deg, #f8fafc 0%, var(--color-bg) 100%);
}

.qr-card {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease, border-color 240ms ease, border-radius 240ms ease, filter 240ms ease;
    border: 2px solid transparent;
    border-radius: 24px;
    box-shadow: 0 16px 45px rgba(15, 23, 42, 0.08);
}

.qr-card:hover {
    transform: translateY(-4px) scale(1.02);
    border-color: rgba(20, 184, 166, 0.65);
    box-shadow: 0 30px 90px rgba(15, 23, 42, 0.16), 0 10px 30px rgba(109, 40, 217, 0.16);
    filter: saturate(1.05);
}

.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: radial-gradient(900px 520px at 85% 15%, rgba(20, 184, 166, 0.08) 0%, rgba(255,255,255,0) 55%),
                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 !important;
    background: linear-gradient(180deg, rgba(109, 40, 217, 1) 0%, rgba(91, 33, 182, 1) 100%);
    color: #fff;
    box-shadow: 0 16px 40px rgba(109, 40, 217, 0.22), 0 6px 16px rgba(2, 6, 23, 0.10);
    border: 1px solid rgba(255,255,255,0.20);
}

.app-install-section .bg-white {
    transition: box-shadow 240ms cubic-bezier(0.2, 0.9, 0.2, 1), transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1);
    position: relative;
    overflow: hidden;
    border-radius: 26px;
    background: rgba(255,255,255,0.78);
    box-shadow: 0 22px 70px rgba(15, 23, 42, 0.08), 0 2px 8px rgba(109, 40, 217, 0.06);
    border: 1px solid rgba(109, 40, 217, 0.10);
}

.app-install-section .bg-white:hover {
    transform: translateY(-6px);
    box-shadow: 0 34px 95px rgba(15, 23, 42, 0.14), 0 10px 26px rgba(109, 40, 217, 0.14);
}

.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 240ms cubic-bezier(0.2, 0.9, 0.2, 1);
    opacity: 0.98;
}

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

/* ============================================
   5. App Showcase (AppShowcaseSection)
   ============================================ */
.app-showcase-section {
    background: radial-gradient(900px 420px at 15% 20%, rgba(109, 40, 217, 0.10) 0%, rgba(255,255,255,0) 55%),
                var(--color-bg);
}

.app-showcase-section img {
    transition: transform 520ms cubic-bezier(0.2, 0.9, 0.2, 1), filter 520ms cubic-bezier(0.2, 0.9, 0.2, 1);
    filter: drop-shadow(0 18px 40px rgba(2, 6, 23, 0.22)) drop-shadow(0 6px 14px rgba(109, 40, 217, 0.16));
    border-radius: 22px;
}

.app-showcase-section img:hover {
    transform: translateY(-6px) rotate(-1deg) scale(1.01);
    filter: drop-shadow(0 28px 65px rgba(2, 6, 23, 0.26)) drop-shadow(0 10px 24px rgba(20, 184, 166, 0.18));
}

.app-showcase-section .bg-white {
    transition: box-shadow 240ms cubic-bezier(0.2, 0.9, 0.2, 1), transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), border-inline-start-color 240ms ease;
    border-inline-start: 3px solid transparent;
    border-radius: 26px;
    background: rgba(255,255,255,0.8);
    box-shadow: 0 18px 55px rgba(15, 23, 42, 0.08), 0 2px 10px rgba(109, 40, 217, 0.06);
    border: 1px solid rgba(109, 40, 217, 0.10);
}

.app-showcase-section .bg-white:hover {
    border-inline-start-color: rgba(109, 40, 217, 0.85);
    transform: translateX(6px);
    box-shadow: 0 30px 90px rgba(15, 23, 42, 0.14), 0 10px 26px rgba(109, 40, 217, 0.14);
}

/* ============================================
   6. Contact Sections
   ============================================ */
.contact-channels-section {
    background: radial-gradient(900px 520px at 75% 15%, rgba(20, 184, 166, 0.08) 0%, rgba(255,255,255,0) 55%),
                var(--color-bg);
}

.contact-channels-section article {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease, border-color 240ms ease, background-color 240ms ease;
    border: 1px solid var(--color-border-soft);
    border-radius: 24px;
    background: rgba(255,255,255,0.75);
    box-shadow: 0 18px 55px rgba(15, 23, 42, 0.07);
}

.contact-channels-section article:hover {
    transform: translateY(-6px);
    box-shadow: 0 34px 95px rgba(15, 23, 42, 0.14), 0 10px 26px rgba(109, 40, 217, 0.14);
    border-color: rgba(109, 40, 217, 0.65);
}

.contact-channels-section article ul li {
    transition: padding 160ms cubic-bezier(0.2, 0.9, 0.2, 1), color 160ms ease;
    color: rgba(71, 85, 105, 0.95);
}

.contact-channels-section article ul li:hover {
    padding-inline-start: 6px;
    color: rgba(15, 23, 42, 0.95);
}

/* Contact Quick */
.contact-quick-section {
    background: radial-gradient(900px 520px at 18% 10%, rgba(109, 40, 217, 0.08) 0%, rgba(255,255,255,0) 55%),
                var(--color-bg-soft);
}

.contact-quick-section .contact-card {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease, background-color 240ms ease;
    border-radius: 24px;
    background: rgba(255,255,255,0.78);
    box-shadow: 0 16px 45px rgba(15, 23, 42, 0.08);
}

.contact-quick-section .contact-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 34px 95px rgba(15, 23, 42, 0.14), 0 10px 26px rgba(109, 40, 217, 0.14);
}

.contact-quick-section .contact-card i {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), color 240ms ease, filter 240ms ease;
    color: rgba(109, 40, 217, 0.95);
    filter: drop-shadow(0 10px 18px rgba(109, 40, 217, 0.18));
}

.contact-quick-section .contact-card:hover i {
    transform: scale(1.12) rotate(-6deg);
    color: rgba(20, 184, 166, 0.98);
    filter: drop-shadow(0 18px 28px rgba(20, 184, 166, 0.20));
}

/* Contact Form */
.contact-form-section {
    background: radial-gradient(900px 520px at 80% 10%, rgba(109, 40, 217, 0.10) 0%, rgba(255,255,255,0) 55%),
                var(--color-bg-soft);
}

.contact-form-section .form-control,
.contact-form-section .form-select {
    border: 2px solid rgba(109, 40, 217, 0.20);
    transition: border-color 180ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 180ms ease, background-color 180ms ease;
    border-radius: 18px;
    background: rgba(255,255,255,0.86);
    box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

.contact-form-section .form-control:focus,
.contact-form-section .form-select:focus {
    border-color: rgba(109, 40, 217, 0.9);
    box-shadow: 0 0 0 0.22rem rgba(109, 40, 217, 0.14), 0 18px 50px rgba(109, 40, 217, 0.12);
    outline: 1px solid rgba(109, 40, 217, 0.25);
    outline-offset: 2px;
    background: rgba(255,255,255,0.94);
}

.contact-form-section button[type="submit"] {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease, background-color 240ms ease, border-color 240ms ease, filter 240ms ease;
    border-radius: 999px;
}

.contact-form-section button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
    filter: saturate(1.05);
}

/* Contact Commitments */
.contact-commitments-section {
    background: radial-gradient(900px 520px at 20% 15%, rgba(20, 184, 166, 0.10) 0%, rgba(255,255,255,0) 55%),
                var(--color-bg-soft);
}

.contact-commitments-section .bg-white {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease;
    text-align: center;
    border-radius: 26px;
    background: rgba(255,255,255,0.80);
    box-shadow: 0 18px 55px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(109, 40, 217, 0.10);
}

.contact-commitments-section .bg-white:hover {
    transform: translateY(-6px);
    box-shadow: 0 34px 95px rgba(15, 23, 42, 0.14), 0 10px 26px rgba(109, 40, 217, 0.14);
}

.contact-commitments-section .bg-white i {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), color 240ms ease, filter 240ms ease;
    color: rgba(109, 40, 217, 0.95);
    filter: drop-shadow(0 12px 20px rgba(109, 40, 217, 0.18));
}

.contact-commitments-section .bg-white:hover i {
    transform: scale(1.15);
    color: rgba(20, 184, 166, 0.98);
    filter: drop-shadow(0 18px 30px rgba(20, 184, 166, 0.20));
}

/* ============================================
   7. Login / Signup Forms
   ============================================ */
main:has(> .container > .bg-white > form) .input-group-text {
    background-color: rgba(148, 163, 184, 0.20);
    border-color: rgba(109, 40, 217, 0.22);
    border-inline-end: none;
    border-radius: 18px 0 0 18px;
    color: rgba(15, 23, 42, 0.85);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.22);
}

main:has(> .container > .bg-white > form) .input-group .form-control {
    border-inline-start: none;
    border-radius: 0 18px 18px 0;
}

main:has(> .container > .bg-white > form) .input-group:focus-within .input-group-text {
    border-color: rgba(109, 40, 217, 0.85);
    background-color: rgba(239, 246, 255, 0.95);
    box-shadow: 0 0 0 0.18rem rgba(109, 40, 217, 0.14);
}

main:has(> .container > .bg-white > form) .input-group:focus-within .form-control {
    border-color: rgba(109, 40, 217, 0.85);
    box-shadow: 0 0 0 0.18rem rgba(109, 40, 217, 0.12);
}

main:has(> .container > .bg-white > form) .form-check-input:checked {
    background-color: rgba(109, 40, 217, 1);
    border-color: rgba(109, 40, 217, 1);
    box-shadow: 0 18px 50px rgba(109, 40, 217, 0.25);
}

main:has(> .container > .bg-white > form) button[type="submit"] {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease, background-color 240ms ease, border-color 240ms ease;
    font-weight: 600;
    border-radius: 999px;
    box-shadow: 0 16px 45px rgba(109, 40, 217, 0.14);
}

main:has(> .container > .bg-white > form) button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

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

.icon-emoji {
    display: inline-block;
    line-height: 1;
}

/* ============================================
   9. Hero Buttons (đã có ở theme.css nhưng bổ sung thêm)
   ============================================ */
.hero-buttons .btn {
    transition: transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 240ms ease, background-color 240ms ease, border-color 240ms ease, color 240ms ease;
    border-radius: 999px;
}

.hero-buttons .btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.hero-buttons .btn-warning {
    background-color: rgba(20, 184, 166, 1);
    border-color: rgba(20, 184, 166, 1);
    color: rgba(35, 16, 80, 0.95);
    font-weight: 600;
    box-shadow: 0 18px 48px rgba(20, 184, 166, 0.18), 0 6px 18px rgba(15, 23, 42, 0.10);
}

.hero-buttons .btn-warning:hover {
    background-color: rgba(13, 148, 136, 1);
    border-color: rgba(13, 148, 136, 1);
    box-shadow: 0 26px 70px rgba(13, 148, 136, 0.22), 0 10px 26px rgba(109, 40, 217, 0.14);
}

.hero-buttons .btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.18);
    color: #ffffff;
    box-shadow: 0 18px 55px rgba(2, 6, 23, 0.16);
}

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

::-webkit-scrollbar-track {
    background: rgba(148, 163, 184, 0.20);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(109, 40, 217, 0.85) 0%, rgba(20, 184, 166, 0.75) 100%);
    border-radius: 6px;
    border: 2px solid rgba(255,255,255,0.55);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(91, 33, 182, 0.95) 0%, rgba(13, 148, 136, 0.90) 100%);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(109, 40, 217, 0.78) rgba(148, 163, 184, 0.18);
}

/* ============================================
   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;
    }

    :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(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.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;
    }
}

@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        border-radius: 999px;
        color: rgba(22, 20, 40, 0.92);
        border-style: solid;
        border-color: rgba(255, 255, 255, 0.55);
        border-width: 1px;
        background: linear-gradient(180deg, rgba(255, 221, 105, 0.98) 0%, rgba(255, 196, 68, 0.92) 100%);
        box-shadow:
            0 10px 26px rgba(24, 20, 50, 0.10),
            0 2px 10px rgba(24, 20, 50, 0.08),
            inset 0 1px 0 rgba(255, 255, 255, 0.7);
        text-shadow: 0 1px 0 rgba(255, 255, 255, 0.45);
        transition:
            color 240ms ease,
            background 240ms ease,
            box-shadow 240ms ease,
            border-color 240ms ease;
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        border-radius: 20px;
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.90) 100%);
        border-style: solid;
        border-color: rgba(233, 236, 246, 0.9);
        border-width: 1px;
        box-shadow:
            0 18px 44px rgba(16, 18, 40, 0.10),
            0 6px 18px rgba(16, 18, 40, 0.08),
            0 1px 0 rgba(255, 255, 255, 0.9) inset,
            0 -1px 0 rgba(226, 230, 244, 0.75) inset;
        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),
            border-color 260ms cubic-bezier(0.2, 0.9, 0.2, 1);
    }

    .contact-channels-section article:before,
    .contact-quick-section .contact-card:before {
        content: "";
        display: block;
        width: 100%;
        height: 100%;
        position: absolute;
        inset: 0;
        pointer-events: none;
        border-radius: inherit;
        background:
            radial-gradient(900px 220px at 18% 0%, rgba(131, 199, 255, 0.22) 0%, rgba(131, 199, 255, 0.00) 55%),
            radial-gradient(700px 260px at 82% 20%, rgba(255, 171, 210, 0.16) 0%, rgba(255, 171, 210, 0.00) 60%);
        opacity: 1;
        filter: saturate(1.05);
        mix-blend-mode: normal;
    }
}