@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --primary: #00AEEF;
  --primary-dark: #0090c8;
  --accent-gold: #D4A843;
  --accent-red: #C41E3A;
  --dark: #0a0a0a;
  --dark-card: #111;
  --dark-surface: #1a1a1a;
  --dark-border: #262626;
  --text: #fff;
  --text-sec: #a7a7a7;
  --text-muted: #666;
  --gradient-primary: linear-gradient(135deg, #00AEEF, #0077b6);
  --gradient-gold: linear-gradient(135deg, #D4A843, #b8860b);
  --gradient-vn: linear-gradient(135deg, #C41E3A 0%, #D4A843 50%, #00AEEF 100%);
  --shadow-glow: 0 0 30px rgba(0,174,239,0.14);
  --r: 8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Be Vietnam Pro', sans-serif; background: var(--dark); color: var(--text); line-height: 1.7; overflow-x: hidden; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* FLOATING CONTACT */
.floating-contact { position: fixed; left: 24px; bottom: 24px; z-index: 1200; display: grid; gap: 12px; }
.floating-contact-btn { width: 58px; height: 58px; border-radius: 50%; display: flex; align-items: center; justify-content: center; text-decoration: none; font-weight: 900; transition: 0.25s; box-shadow: 0 12px 28px rgba(0,0,0,0.3); }
.floating-contact-btn:hover { transform: translateY(-3px) scale(1.03); }
.floating-zalo { background: #fff; color: #0068ff; border: 4px solid #0068ff; font-size: 1rem; }
.floating-zalo span { line-height: 1; }
.floating-phone { background: linear-gradient(135deg, #16a34a, #22c55e); color: #fff; font-size: 1.5rem; border: 2px solid rgba(255,255,255,0.22); }

/* NAV */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 14px 0; backdrop-filter: blur(20px); background: rgba(10,10,10,0.86); border-bottom: 1px solid transparent; transition: 0.4s; }
.navbar.scrolled { padding: 8px 0; border-bottom-color: var(--dark-border); }
.nav-container { max-width: 1240px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.nav-logo { display: flex; align-items: center; text-decoration: none; width: 124px; height: 46px; overflow: hidden; flex: 0 0 auto; }
.nav-logo img { width: 124px; height: 46px; object-fit: cover; object-position: center; display: block; }
.nav-links { display: flex; gap: 26px; list-style: none; align-items: center; }
.nav-links a { color: var(--text-sec); text-decoration: none; font-weight: 600; font-size: 0.88rem; transition: 0.3s; position: relative; white-space: nowrap; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--primary); transition: 0.3s; }
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.language-switcher { display: inline-flex; align-items: center; gap: 4px; padding: 4px; border: 1px solid var(--dark-border); border-radius: 999px; background: rgba(255,255,255,0.04); }
.lang-btn { min-width: 38px; height: 28px; border: 0; border-radius: 999px; background: transparent; color: var(--text-sec); font: inherit; font-size: 0.72rem; font-weight: 800; cursor: pointer; transition: 0.25s; }
.lang-btn:hover, .lang-btn.active { background: rgba(0,174,239,0.16); color: var(--text); }
.nav-cta { background: var(--gradient-primary); color: #fff; border: none; padding: 10px 22px; border-radius: 50px; font-weight: 700; font-size: 0.88rem; cursor: pointer; transition: 0.3s; text-decoration: none; white-space: nowrap; }
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,174,239,0.3); }
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; flex: 0 0 auto; }
.mobile-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; transition: 0.3s; }

/* HERO */
.hero { min-height: 100vh; display: flex; align-items: center; position: relative; overflow: hidden; padding: 112px 24px 72px; }
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 20% 50%, rgba(196,30,58,0.07) 0%, transparent 50%), radial-gradient(ellipse at 82% 30%, rgba(212,168,67,0.08) 0%, transparent 48%), radial-gradient(ellipse at 52% 82%, rgba(0,174,239,0.06) 0%, transparent 48%); }
.bronze-drum { position: absolute; right: -8%; top: 50%; transform: translateY(-50%); width: 640px; height: 640px; opacity: 0.06; animation: drumRotate 80s linear infinite; }
@keyframes drumRotate { to { transform: translateY(-50%) rotate(360deg); } }

.hero-content { max-width: 1240px; margin: 0 auto; width: 100%; display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(500px, 1.1fr); gap: 50px; align-items: center; position: relative; z-index: 1; }
.hero-text h1 { font-size: 3.05rem; font-weight: 900; line-height: 1.14; margin-bottom: 20px; letter-spacing: 0; }
.hero-text h1 .highlight { color: var(--primary); }
.hero-text h1 .gold { color: var(--accent-gold); }
.hero-text p { font-size: 1.04rem; color: var(--text-sec); margin-bottom: 32px; max-width: 560px; }
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-badge { background: var(--dark-surface); border: 1px solid var(--dark-border); padding: 6px 14px; border-radius: 50px; font-size: 0.8rem; color: var(--text-sec); display: flex; align-items: center; gap: 8px; }
.hero-badge .icon { color: var(--primary); font-weight: 900; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary { background: var(--gradient-primary); color: #fff; border: none; padding: 13px 30px; border-radius: 50px; font-weight: 800; font-size: 0.94rem; cursor: pointer; transition: 0.3s; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 50px; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(0,174,239,0.3); }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--dark-border); padding: 13px 30px; border-radius: 50px; font-weight: 700; font-size: 0.94rem; cursor: pointer; transition: 0.3s; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; min-height: 50px; }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-mockup { width: min(100%, 580px); border-radius: var(--r); border: 1px solid rgba(255,255,255,0.14); box-shadow: 0 14px 42px rgba(0,0,0,0.5); animation: float 6s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* SECTIONS */
section { padding: 82px 24px; position: relative; }
.section-container { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(0,174,239,0.08); border: 1px solid rgba(0,174,239,0.18); padding: 6px 16px; border-radius: 50px; font-size: 0.8rem; color: var(--primary); font-weight: 800; margin-bottom: 14px; }
.section-title { font-size: 2.2rem; font-weight: 900; margin-bottom: 12px; line-height: 1.2; letter-spacing: 0; }
.section-title .highlight, .highlight { color: var(--primary); }
.section-title .gold, .gold { color: var(--accent-gold); }
.section-subtitle { color: var(--text-sec); font-size: 1rem; max-width: 700px; margin: 0 auto; }
.vn-divider { width: 64px; height: 3px; background: var(--gradient-vn); margin: 16px auto; border-radius: 2px; }

/* PRICING */
.pricing-section { background: linear-gradient(180deg, #0a0a0a 0%, #0e0e0e 100%); padding-top: 88px; }
.pricing-grid { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr); gap: 24px; align-items: stretch; }
.pricing-card { position: relative; background: var(--dark-card); border: 1px solid var(--dark-border); border-radius: var(--r); padding: 32px; display: flex; flex-direction: column; min-height: 100%; overflow: hidden; }
.pricing-card.primary { border-color: rgba(212,168,67,0.65); background: linear-gradient(145deg, rgba(212,168,67,0.13), rgba(0,174,239,0.08) 44%, rgba(17,17,17,0.98)); box-shadow: 0 18px 42px rgba(212,168,67,0.08), var(--shadow-glow); transform: translateY(-8px); }
.pricing-card.enterprise { background: linear-gradient(145deg, rgba(0,174,239,0.06), rgba(17,17,17,0.98)); }
.popular-ribbon { position: absolute; top: 18px; right: 18px; padding: 6px 12px; border-radius: 999px; background: var(--gradient-gold); color: #111; font-size: 0.72rem; font-weight: 900; }
.pricing-top { padding-right: 90px; }
.pricing-kicker { color: var(--primary); font-weight: 800; font-size: 0.78rem; text-transform: uppercase; margin-bottom: 8px; }
.pricing-card h3 { font-size: 1.45rem; line-height: 1.25; margin-bottom: 12px; }
.price { color: var(--accent-gold); font-size: 2.65rem; font-weight: 900; line-height: 1.1; margin-bottom: 22px; letter-spacing: 0; }
.contact-price { font-size: 2rem; color: var(--primary); }
.pricing-features { list-style: none; display: grid; gap: 12px; margin: 8px 0 28px; color: var(--text-sec); }
.pricing-features li { position: relative; padding-left: 26px; font-size: 0.94rem; }
.pricing-features li::before { content: ''; position: absolute; left: 0; top: 0.75em; width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 12px rgba(0,174,239,0.45); }
.pricing-btn { margin-top: auto; width: 100%; }
.addon-pricing { margin-top: 36px; padding: 28px; background: rgba(255,255,255,0.035); border: 1px solid var(--dark-border); border-radius: var(--r); }
.addon-heading { text-align: center; max-width: 760px; margin: 0 auto 24px; }
.addon-heading h3 { font-size: 1.45rem; font-weight: 900; line-height: 1.3; margin-bottom: 8px; }
.addon-heading p { color: var(--text-sec); font-size: 0.92rem; }
.addon-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.addon-card { background: var(--dark-card); border: 1px solid var(--dark-border); border-radius: var(--r); padding: 20px; min-height: 238px; display: flex; flex-direction: column; transition: 0.35s; }
.addon-card:hover { border-color: rgba(0,174,239,0.36); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.addon-icon { width: 46px; height: 46px; border-radius: 8px; background: rgba(0,174,239,0.1); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 0.72rem; font-weight: 900; margin-bottom: 14px; }
.addon-card h4 { font-size: 1rem; line-height: 1.3; font-weight: 850; margin-bottom: 8px; }
.addon-price { color: var(--accent-gold); font-size: 1.08rem; font-weight: 900; margin-bottom: 10px; }
.addon-card p:not(.addon-price) { color: var(--text-sec); font-size: 0.84rem; line-height: 1.55; }

/* WARRANTY */
.warranty-section { background: linear-gradient(135deg, rgba(196,30,58,0.03), rgba(212,168,67,0.04), rgba(0,174,239,0.03)); }
.warranty-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.warranty-card { text-align: left; padding: 26px; background: var(--dark-card); border: 1px solid var(--dark-border); border-radius: var(--r); transition: 0.4s; }
.warranty-card:hover { border-color: rgba(0,174,239,0.34); transform: translateY(-4px); }
.warranty-icon { width: 42px; height: 42px; border-radius: 50%; background: rgba(0,174,239,0.1); color: var(--primary); display: flex; align-items: center; justify-content: center; font-weight: 900; margin-bottom: 16px; }
.warranty-card h3 { font-size: 1.02rem; font-weight: 800; margin-bottom: 8px; }
.warranty-card p { color: var(--text-sec); font-size: 0.88rem; }

/* PARTNERS */
.partners-section { background: #0b0b0b; }
.partners-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.partner-card { min-height: 142px; background: rgba(255,255,255,0.96); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--r); padding: 18px 14px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; color: #161616; text-align: center; transition: 0.35s; }
.partner-card:hover { transform: translateY(-4px); box-shadow: 0 14px 28px rgba(0,0,0,0.22); }
.partner-card img { max-width: 150px; max-height: 56px; width: auto; height: auto; object-fit: contain; display: block; }
.partner-card span { font-size: 0.78rem; font-weight: 800; line-height: 1.35; }
.partner-card .aivos-partner-logo { width: 110px; height: 84px; max-height: 84px; border-radius: 6px; }
.project-card { min-height: 210px; justify-content: flex-start; padding: 22px 18px; }
.project-card img { margin-bottom: 2px; }
.partner-copy { display: grid; gap: 8px; justify-items: center; }
.partner-card p { max-width: 230px; color: #454545; font-size: 0.78rem; font-weight: 600; line-height: 1.45; }
.partners-subtitle { margin: 42px 0 18px; text-align: center; font-size: 1.05rem; font-weight: 900; }
.tech-partners-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.tech-partner-card { min-height: 112px; background: rgba(255,255,255,0.05); border: 1px solid var(--dark-border); border-radius: var(--r); padding: 16px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; color: var(--text-sec); text-align: center; font-size: 0.84rem; font-weight: 800; line-height: 1.45; transition: 0.35s; }
.tech-partner-card:hover { border-color: rgba(0,174,239,0.34); color: var(--text); transform: translateY(-3px); }
.tech-brand-logo { width: min(190px, 82%); height: 54px; object-fit: contain; display: block; filter: drop-shadow(0 8px 14px rgba(0,0,0,0.24)); }
.gov-brand-logo { width: min(150px, 78%); height: 62px; }
.haui-brand-logo { width: min(180px, 82%); height: 58px; }

/* PROCESS */
.process-timeline { position: relative; max-width: 760px; margin: 0 auto; }
.process-line { position: absolute; left: 28px; top: 0; bottom: 0; width: 2px; background: linear-gradient(180deg, var(--accent-red), var(--accent-gold), var(--primary)); }
.process-step { display: flex; gap: 24px; margin-bottom: 36px; position: relative; opacity: 0; transform: translateX(-20px); animation: slideIn 0.6s ease forwards; }
.process-step:nth-child(2) { animation-delay: 0.1s; }
.process-step:nth-child(3) { animation-delay: 0.25s; }
.process-step:nth-child(4) { animation-delay: 0.4s; }
.process-step:nth-child(5) { animation-delay: 0.55s; }
@keyframes slideIn { to { opacity: 1; transform: translateX(0); } }
.step-number { width: 56px; height: 56px; min-width: 56px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; font-weight: 900; z-index: 1; }
.step-content { padding-top: 10px; }
.step-content h3 { font-size: 1.05rem; font-weight: 800; margin-bottom: 4px; }
.step-content p { color: var(--text-sec); font-size: 0.9rem; }

/* PORTFOLIO */
.portfolio-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.portfolio-card { background: var(--dark-card); border: 1px solid var(--dark-border); border-radius: var(--r); overflow: hidden; transition: 0.4s; position: relative; }
.portfolio-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-glow); }
.portfolio-card.highlight { border-color: rgba(212,168,67,0.65); }
.portfolio-card.highlight::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-gold); z-index: 2; }
.portfolio-img { width: 100%; height: 220px; object-fit: cover; object-position: top; display: block; }
.portfolio-info { padding: 20px; }
.portfolio-info h3 { font-size: 1.05rem; font-weight: 800; margin-bottom: 6px; }
.portfolio-info p { color: var(--text-sec); font-size: 0.86rem; margin-bottom: 14px; }
.portfolio-meta { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.portfolio-tag { font-size: 0.78rem; font-weight: 800; color: var(--accent-gold); background: rgba(212,168,67,0.1); border: 1px solid rgba(212,168,67,0.2); border-radius: 999px; padding: 4px 10px; }
.portfolio-link { color: var(--primary); text-decoration: none; font-weight: 800; font-size: 0.85rem; display: flex; align-items: center; gap: 4px; transition: gap 0.3s; white-space: nowrap; }
.portfolio-link:hover { gap: 8px; }

/* CONTACT */
.contact-grid { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 40px; align-items: start; }
.contact-info h3 { font-size: 1.3rem; font-weight: 800; margin-bottom: 22px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 20px; }
.contact-icon { width: 44px; height: 44px; min-width: 44px; border-radius: 8px; background: rgba(0,174,239,0.08); display: flex; align-items: center; justify-content: center; font-size: 0.64rem; color: var(--primary); font-weight: 900; }
.contact-item h4 { font-weight: 700; margin-bottom: 2px; font-size: 0.9rem; }
.contact-item p { color: var(--text-sec); font-size: 0.86rem; }
.quick-contact-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.quick-contact-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 8px 14px; border-radius: 999px; color: #fff; text-decoration: none; font-size: 0.82rem; font-weight: 850; transition: 0.25s; }
.quick-contact-btn:hover { transform: translateY(-2px); }
.phone-btn { background: linear-gradient(135deg, #16a34a, #22c55e); box-shadow: 0 8px 18px rgba(34,197,94,0.16); }
.zalo-btn { background: linear-gradient(135deg, #0068ff, var(--primary)); box-shadow: 0 8px 18px rgba(0,104,255,0.16); }
.contact-form { background: var(--dark-card); border: 1px solid var(--dark-border); border-radius: var(--r); padding: 32px; }
.contact-form h3 { margin-bottom: 20px; font-size: 1.2rem; font-weight: 800; }
.form-group { margin-bottom: 16px; border: 0; }
.form-group label, .form-group legend { display: block; font-weight: 700; margin-bottom: 6px; font-size: 0.85rem; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--dark-border); background: var(--dark-surface); color: var(--text); font-size: 0.9rem; font-family: inherit; transition: 0.3s; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 100px; }
.addon-selector { display: grid; gap: 10px; padding: 14px; border: 1px solid var(--dark-border); border-radius: var(--r); background: rgba(255,255,255,0.025); }
.addon-selector legend { padding: 0 4px; color: var(--text); }
.addon-selector.is-hidden { display: none; }
.addon-option { display: grid !important; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 10px; margin: 0 !important; padding: 10px 12px; border: 1px solid var(--dark-border); border-radius: 8px; background: var(--dark-surface); cursor: pointer; transition: 0.25s; }
.addon-option:hover { border-color: rgba(0,174,239,0.38); }
.addon-option input { width: 18px; height: 18px; accent-color: var(--primary); }
.addon-option span { min-width: 0; color: var(--text); font-size: 0.86rem; }
.addon-option strong { color: var(--accent-gold); font-size: 0.84rem; white-space: nowrap; }
.form-submit { width: 100%; padding: 14px; background: var(--gradient-primary); color: #fff; border: none; border-radius: 50px; font-weight: 800; font-size: 0.95rem; cursor: pointer; transition: 0.3s; }
.form-submit:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,174,239,0.3); }
.form-submit:disabled { opacity: 0.7; cursor: progress; transform: none; }
.form-success { display: none; margin-top: 14px; padding: 12px 14px; border-radius: 8px; background: rgba(0,174,239,0.1); border: 1px solid rgba(0,174,239,0.28); color: var(--text); font-size: 0.86rem; font-weight: 700; text-align: center; }
.form-success.active { display: block; }
.form-note { text-align: center; margin-top: 12px; font-size: 0.82rem; color: var(--text-sec); }

/* CTA */
.cta-section { background: linear-gradient(135deg, rgba(196,30,58,0.08), rgba(212,168,67,0.06), rgba(0,174,239,0.08)); text-align: center; overflow: hidden; }
.cta-section h2 { font-size: 2.2rem; font-weight: 900; margin-bottom: 12px; }
.cta-section p { color: var(--text-sec); font-size: 1rem; margin-bottom: 28px; max-width: 640px; margin-left: auto; margin-right: auto; }

/* FOOTER */
.footer { background: var(--dark-card); border-top: 1px solid var(--dark-border); padding: 48px 24px 24px; }
.footer-content { max-width: 1200px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.footer-brand p { color: var(--text-sec); font-size: 0.85rem; margin-top: 12px; max-width: 360px; }
.footer-col h4 { font-weight: 800; margin-bottom: 12px; font-size: 0.9rem; }
.footer-col a { display: block; color: var(--text-sec); text-decoration: none; font-size: 0.85rem; padding: 3px 0; transition: 0.3s; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--dark-border); padding-top: 20px; display: flex; justify-content: space-between; align-items: center; color: var(--text-muted); font-size: 0.8rem; gap: 16px; }

/* PARTICLES */
.particles { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.particle { position: absolute; width: 3px; height: 3px; border-radius: 50%; opacity: 0; animation: particleFloat 10s infinite; }
.particle.gold { background: var(--accent-gold); }
.particle.red { background: var(--accent-red); }
.particle.blue { background: var(--primary); }
@keyframes particleFloat { 0% { opacity: 0; transform: translateY(100vh) scale(0); } 15% { opacity: 0.5; } 100% { opacity: 0; transform: translateY(-100px) scale(1); } }

/* REVEAL */
.reveal { opacity: 0; transform: translateY(24px); transition: all 0.7s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* RESPONSIVE */
@media (max-width: 1120px) {
  .nav-links { gap: 18px; }
  .hero-content { grid-template-columns: 1fr; text-align: center; }
  .hero-text p { margin: 0 auto 32px; }
  .hero-actions, .hero-badges { justify-content: center; }
  .hero-visual { margin-top: 28px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.primary { transform: none; }
  .addon-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-partners-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .mobile-toggle { display: block; }
  .nav-links.active { display: flex; flex-direction: column; align-items: flex-start; position: absolute; top: 100%; left: 0; right: 0; background: var(--dark); padding: 20px 24px; gap: 16px; border-bottom: 1px solid var(--dark-border); }
  .portfolio-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .navbar { padding: 10px 0; }
  .nav-container { padding: 0 16px; gap: 10px; }
  .nav-logo { width: 104px; height: 42px; }
  .nav-logo img { width: 104px; height: 42px; }
  .language-switcher { gap: 2px; padding: 3px; }
  .lang-btn { min-width: 32px; height: 26px; font-size: 0.66rem; }
  .hero { padding: 104px 18px 54px; }
  .hero-text h1 { font-size: 2.08rem; }
  .hero-text p { font-size: 0.96rem; }
  .section-title, .cta-section h2 { font-size: 1.65rem; }
  section { padding: 64px 18px; }
  .warranty-grid, .partners-grid, .tech-partners-grid { grid-template-columns: 1fr; }
  .addon-pricing { padding: 22px 16px; }
  .addon-grid { grid-template-columns: 1fr; }
  .addon-card { min-height: auto; }
  .pricing-card { padding: 26px 20px; }
  .pricing-top { padding-right: 0; }
  .popular-ribbon { position: static; width: fit-content; margin-bottom: 18px; }
  .price { font-size: 2.2rem; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .portfolio-meta { align-items: flex-start; flex-direction: column; }
  .floating-contact { left: 14px; bottom: 14px; gap: 10px; }
  .floating-contact-btn { width: 52px; height: 52px; }
  .floating-zalo { font-size: 0.92rem; border-width: 3px; }
  .floating-phone { font-size: 1.34rem; }
}

@media (max-width: 420px) {
  .nav-logo { width: 92px; }
  .nav-logo img { width: 92px; }
  .hero-text h1 { font-size: 1.86rem; }
  .hero-actions .btn-primary, .hero-actions .btn-secondary { width: 100%; }
  .contact-form { padding: 24px 18px; }
}