/* ===== TOKENS ===== */
        :root {
            --stone-50: #F1ECE2; --stone-100: #E7DECC; --stone-200: #D9CBAD;
            --basalt-900: #16171A; --basalt-800: #212226; --basalt-700: #2C2D32;
            --brass-500: #AD8348; --brass-400: #C9A469;
            --verde-600: #54614C; --verde-500: #6C7A62;
            --fleck-50: #FAF7EF; --ink-800: #2A271F; --ink-600: #524C3F; --ink-400: #8A8371;
            --line: rgba(42,39,31,0.14); --line-dark: rgba(250,247,239,0.14);
            --radius: 2px; --serif: 'Playfair Display', serif; --sans: 'Be Vietnam Pro', sans-serif;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body { font-family: var(--sans); background: var(--stone-50); color: var(--ink-800); line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
        img { max-width: 100%; display: block; }
        a { text-decoration: none; color: inherit; }
        button { font-family: inherit; cursor: pointer; border: none; background: none; }
        .eyebrow { font-family: var(--sans); font-weight: 700; font-size: 0.72rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--brass-500); display: flex; align-items: center; gap: 0.6em; }
        .eyebrow::before { content: ''; width: 22px; height: 1px; background: var(--brass-500); }

        /* ===== HEADER ===== */
        header {
            position: sticky; top: 0; z-index: 200; display: flex; align-items: center; justify-content: space-between;
            padding: 1.1rem 2.5rem; background: rgba(241,236,226,0.92); backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
        }
        .logo { font-family: var(--serif); font-weight: 700; font-size: 1.5rem; letter-spacing: 0.02em; color: var(--ink-800); }
        .logo span { color: var(--brass-500); }
        .nav-links { display: flex; list-style: none; gap: 2.2rem; }
        .nav-links a { font-size: 0.82rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-600); position: relative; padding-bottom: 4px; }
        .nav-links a::after { content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: var(--brass-500); transition: width 0.25s ease; }
        .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
        .nav-links a:hover, .nav-links a.active { color: var(--ink-800); }
        .header-actions { display: flex; gap: 0.8rem; }
        .action-btn { display: inline-flex; align-items: center; gap: 0.5em; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; padding: 0.65em 1.1em; border-radius: var(--radius); border: 1px solid var(--ink-800); color: var(--ink-800); transition: all 0.2s ease; white-space: nowrap; }
        .action-btn:hover { background: var(--ink-800); color: var(--stone-50); }
        .zalo-btn { background: var(--brass-500); border-color: var(--brass-500); color: var(--fleck-50); }
        .zalo-btn:hover { background: var(--brass-400); border-color: var(--brass-400); color: var(--basalt-900); }
        .mobile-only { display: none; }
        .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
        .hamburger span { width: 24px; height: 2px; background: var(--ink-800); transition: 0.25s; }

        /* ===== BLOG HERO ===== */
        .blog-hero {
            display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; padding: 3rem 2.5rem 4rem;
            max-width: 1400px; margin: 0 auto; align-items: center;
        }
        .blog-hero-content h1 {
            font-family: var(--serif); font-weight: 600; font-size: clamp(2.2rem, 3.8vw, 3.6rem);
            line-height: 1.1; color: var(--ink-800); margin-bottom: 1rem; letter-spacing: -0.02em;
        }
        .blog-hero-desc { font-size: 1.1rem; color: var(--ink-600); max-width: 36em; margin-bottom: 1.2rem; line-height: 1.7; }
        .blog-hero-meta { display: flex; flex-wrap: wrap; gap: 1.2rem; font-size: 0.82rem; color: var(--ink-400); margin-bottom: 1.5rem; }
        .blog-hero-meta i { margin-right: 0.3rem; color: var(--brass-500); }
        .blog-hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; }
        .btn-primary { background: var(--basalt-900); color: var(--fleck-50); padding: 0.9em 2em; font-weight: 700; font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase; border-radius: var(--radius); transition: transform 0.2s ease, background 0.2s ease; display: inline-block; }
        .btn-primary:hover { background: var(--brass-500); transform: translateY(-2px); }
        .btn-outline { border: 1px solid var(--ink-800); color: var(--ink-800); padding: 0.9em 2em; font-weight: 700; font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase; border-radius: var(--radius); transition: all 0.2s ease; display: inline-block; }
        .btn-outline:hover { background: var(--ink-800); color: var(--stone-50); }
        .blog-hero-image { position: relative; border-radius: var(--radius); overflow: hidden; aspect-ratio: 4/3; background: var(--basalt-800); }
        .blog-hero-image img { width: 100%; height: 100%; object-fit: cover; }

        /* ===== BLOG CONTENT ===== */
        .blog-content-wrapper { max-width: 1000px; margin: 0 auto; padding: 0 2.5rem 4rem; }
        .blog-content-wrapper h2 {
            font-family: var(--serif); font-weight: 600; font-size: clamp(1.6rem, 2.4vw, 2.2rem);
            color: var(--ink-800); margin-top: 2.5rem; margin-bottom: 1rem; line-height: 1.2;
        }
        .blog-content-wrapper p { font-size: 1rem; color: var(--ink-600); line-height: 1.8; margin-bottom: 1rem; }
        .blog-content-wrapper ul { margin: 0.5rem 0 1.5rem 1.5rem; }
        .blog-content-wrapper ul li { font-size: 0.95rem; color: var(--ink-600); line-height: 1.8; margin-bottom: 0.3rem; }
        .blog-content-wrapper .highlight-box { background: var(--stone-100); border-left: 3px solid var(--brass-500); padding: 1.5rem 2rem; margin: 1.5rem 0; border-radius: var(--radius); }
        .blog-content-wrapper .highlight-box p { margin-bottom: 0; font-size: 0.95rem; }

        /* ===== PRICE FACTORS ===== */
        .factors-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.2rem; margin: 1.5rem 0; }
        .factor-item { background: var(--fleck-50); padding: 1.5rem; border-radius: var(--radius); border: 1px solid var(--line); text-align: center; transition: transform 0.3s ease; }
        .factor-item:hover { transform: translateY(-4px); }
        .factor-item i { font-size: 2rem; color: var(--brass-500); margin-bottom: 0.5rem; }
        .factor-item h4 { font-family: var(--serif); font-weight: 600; font-size: 1rem; margin-bottom: 0.3rem; }
        .factor-item p { font-size: 0.85rem; color: var(--ink-400); margin-bottom: 0; }

        /* ===== PRICE RANGE ===== */
        .range-box { background: var(--stone-100); padding: 2rem; border-radius: var(--radius); text-align: center; margin: 1.5rem 0; }
        .range-box .range-text { font-family: var(--serif); font-size: 2rem; font-weight: 700; color: var(--brass-500); }
        .range-box .note { font-size: 0.85rem; color: var(--ink-400); margin-top: 0.3rem; }

        /* ===== CTA BOX ===== */
        .cta-box { background: var(--basalt-900); color: var(--fleck-50); padding: 3rem; border-radius: var(--radius); text-align: center; margin: 2rem 0; }
        .cta-box h3 { font-family: var(--serif); font-weight: 600; font-size: 1.6rem; margin-bottom: 0.5rem; }
        .cta-box p { color: rgba(250,247,239,0.6); margin-bottom: 1.5rem; }
        .cta-box .btn-primary { background: var(--brass-500); color: var(--basalt-900); }
        .cta-box .btn-primary:hover { background: var(--brass-400); }

        /* ===== RELATED ===== */
        .related-posts { padding: 3rem 2.5rem 4rem; max-width: 1400px; margin: 0 auto; }
        .related-posts h3 { font-family: var(--serif); font-weight: 600; font-size: 1.5rem; margin-bottom: 1.5rem; text-align: center; }
        .related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.2rem; }
        .related-item { background: var(--fleck-50); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); transition: transform 0.25s ease; }
        .related-item:hover { transform: translateY(-3px); }
        .related-item img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
        .related-item .info { padding: 0.8rem 1rem 1rem; }
        .related-item .info .badge { font-size: 0.6rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--brass-500); }
        .related-item .info h4 { font-family: var(--serif); font-weight: 600; font-size: 0.9rem; margin-top: 0.2rem; line-height: 1.3; }
        .related-item .info .read-more { font-size: 0.75rem; color: var(--brass-500); font-weight: 600; display: inline-block; margin-top: 0.4rem; }

        /* ===== LEAD SECTION ===== */
        .lead-section {
            background: var(--basalt-900); color: var(--fleck-50); padding: 4rem 2.5rem;
            text-align: center; position: relative; overflow: hidden;
        }
        .lead-section::before { content: ''; position: absolute; inset: 0; opacity: 0.2; background-image: radial-gradient(circle at 20% 30%, var(--brass-400) 4px, transparent 4px), radial-gradient(circle at 70% 60%, var(--fleck-50) 6px, transparent 6px); background-size: 120px 120px; }
        .lead-section h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(1.7rem, 2.6vw, 2.3rem); position: relative; z-index: 1; margin-bottom: 0.5rem; }
        .lead-section .sub { color: rgba(250,247,239,0.6); margin-bottom: 2rem; position: relative; z-index: 1; font-size: 1rem; }
        .lead-form { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.9rem; position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
        .lead-form input, .lead-form select { padding: 0.9em 1.2em; border-radius: var(--radius); border: 1px solid rgba(250,247,239,0.25); background: rgba(250,247,239,0.06); color: var(--fleck-50); font-family: var(--sans); font-size: 0.9rem; flex: 1; min-width: 200px; }
        .lead-form input::placeholder { color: rgba(250,247,239,0.45); }
        .lead-form select { color: rgba(250,247,239,0.75); }
        .lead-form select option { color: var(--ink-800); }
        .lead-form button { background: var(--brass-500); color: var(--basalt-900); font-weight: 700; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; padding: 0.9em 2.5em; border-radius: var(--radius); transition: background 0.2s ease, transform 0.2s ease; }
        .lead-form button:hover { background: var(--brass-400); transform: translateY(-2px); }
        .lead-note { font-size: 0.75rem; color: rgba(250,247,239,0.4); margin-top: 1rem; position: relative; z-index: 1; }

        /* ===== FOOTER ===== */
        footer { background: var(--basalt-900); color: rgba(250,247,239,0.7); padding: 3.5rem 2.5rem 1.5rem; }
        .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; max-width: 1400px; margin: 0 auto 2rem; padding-bottom: 2rem; border-bottom: 1px solid var(--line-dark); }
        footer h4 { font-family: var(--serif); color: var(--fleck-50); font-weight: 600; margin-bottom: 1rem; font-size: 1.02rem; }
        footer p { font-size: 0.85rem; margin-bottom: 0.5rem; line-height: 1.7; }
        .footer-bottom { text-align: center; font-size: 0.75rem; color: rgba(250,247,239,0.4); max-width: 1400px; margin: 0 auto; }

        /* ===== FLOAT & STICKY ===== */
        .float-icons { position: fixed; right: 1.4rem; bottom: 2rem; z-index: 300; display: flex; flex-direction: column; gap: 0.8rem; }
        .float-btn { width: 50px; height: 50px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--basalt-900); color: var(--fleck-50); box-shadow: 0 10px 25px -8px rgba(22,23,26,0.4); font-size: 1.1rem; transition: transform 0.2s ease; }
        .float-btn:hover { transform: scale(1.08); }
        .float-btn.zalo { background: var(--brass-500); color: var(--basalt-900); }
        .sticky-cta { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 300; background: var(--basalt-900); border-top: 1px solid var(--line-dark); padding: 0.5rem 1rem; }
        .sticky-cta-inner { display: flex; gap: 0.8rem; max-width: 600px; margin: 0 auto; }
        .sticky-btn { flex: 1; text-align: center; padding: 0.8rem 0.5rem; font-weight: 700; font-size: 0.75rem; letter-spacing: 0.04em; display: flex; align-items: center; justify-content: center; gap: 0.5em; border-radius: var(--radius); text-transform: uppercase; }
        .sticky-btn.call { background: transparent; color: var(--fleck-50); border: 1px solid rgba(250,247,239,0.2); }
        .sticky-btn.lead { background: var(--brass-500); color: var(--basalt-900); }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 980px) {
            .blog-hero { grid-template-columns: 1fr; padding: 2rem 1.3rem 2.5rem; }
            .blog-hero-image { order: -1; max-height: 320px; }
            .blog-content-wrapper { padding: 0 1.3rem 3rem; }
            .factors-grid { grid-template-columns: 1fr 1fr; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            header { padding: 1rem 1.3rem; }
            .header-actions { display: none; }
            .mobile-only { display: block; }
            .hamburger { display: flex; }
            .nav-links { position: fixed; top: 64px; left: 0; right: 0; background: var(--stone-50); flex-direction: column; padding: 1.5rem; gap: 1.1rem; border-bottom: 1px solid var(--line); transform: translateY(-120%); transition: transform 0.3s ease; opacity: 0; }
            .nav-links.active { transform: translateY(0); opacity: 1; }
            .footer-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 680px) {
            .factors-grid { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr; }
            .blog-hero-cta { flex-direction: column; align-items: flex-start; }
            .blog-hero-cta .btn-primary, .blog-hero-cta .btn-outline { width: 100%; text-align: center; }
            .lead-form input, .lead-form select { min-width: 100%; }
            .sticky-cta { display: block; }
            .float-icons { bottom: 5.2rem; right: 1rem; }
            .cta-box { padding: 2rem 1.3rem; }
            .cta-box h3 { font-size: 1.3rem; }
            .range-box .range-text { font-size: 1.5rem; }
        }