/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --red: #e8001c;
  --red-dark: #b00015;
  --gold: #d4920a;
  --cyan: #0077cc;
  --cyan-dark: #005599;
  --cyan-glow: rgba(0, 119, 204, 0.15);
  --dark: #f4f7fb;
  --dark2: #eaf0f8;
  --dark3: #dde6f2;
  --card-bg: #ffffff;
  --border: #c8d8ea;
  --text: #1a2a3a;
  --text-muted: #5a7a9a;
  --white: #ffffff;
  --navy: #0d1f3c;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.6;
}

/* Biểu tượng gaming mờ ở nền */
.game-symbols {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.game-symbols span {
  position: absolute;
  font-size: clamp(40px, 6vw, 90px);
  opacity: 0.045;
  user-select: none;
  filter: grayscale(1);
}
.gs1  { top:  4%; left:  3%; transform: rotate(-15deg); }
.gs2  { top:  8%; left: 20%; transform: rotate(10deg);  }
.gs3  { top:  3%; left: 40%; transform: rotate(-8deg);  }
.gs4  { top:  5%; left: 60%; transform: rotate(12deg);  }
.gs5  { top:  2%; left: 78%; transform: rotate(-20deg); }
.gs6  { top: 25%; left:  1%; transform: rotate(5deg);   }
.gs7  { top: 30%; left: 90%; transform: rotate(-10deg); }
.gs8  { top: 48%; left: 12%; transform: rotate(18deg);  }
.gs9  { top: 50%; left: 85%; transform: rotate(-5deg);  }
.gs10 { top: 65%; left:  5%; transform: rotate(-12deg); }
.gs11 { top: 68%; left: 50%; transform: rotate(8deg);   }
.gs12 { top: 70%; left: 75%; transform: rotate(-18deg); }
.gs13 { top: 82%; left: 25%; transform: rotate(15deg);  }
.gs14 { top: 85%; left: 88%; transform: rotate(-8deg);  }
.gs15 { top: 92%; left: 45%; transform: rotate(20deg);  }

section, footer, .hook-banner, .sticky-bar { position: relative; z-index: 1; }

a { color: inherit; text-decoration: none; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-title {
  text-align: center;
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
  background: linear-gradient(90deg, var(--navy), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 40px;
  font-size: 1rem;
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-block;
  background: var(--red);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 36px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: background 0.2s, transform 0.1s;
}
.btn-primary:hover { background: var(--red-dark); transform: translateY(-2px); }

.result-actions {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn-zalo {
  display: inline-block;
  background: #0068ff;
  color: #fff;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 6px;
  transition: background 0.2s;
  flex: 1;
  min-width: 140px;
  text-align: center;
}
.btn-zalo:hover { background: #0055cc; }
.btn-view-pc {
  display: inline-block;
  background: var(--white);
  color: var(--navy);
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 6px;
  border: 2px solid var(--navy);
  transition: background 0.2s, color 0.2s;
  flex: 1;
  min-width: 140px;
  text-align: center;
}
.btn-view-pc:hover { background: var(--navy); color: #fff; }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-images {
  position: absolute;
  inset: 0;
  display: flex;
}

.hero-img {
  flex: 1;
  object-fit: cover;
  object-position: top center;
  min-width: 0;
  filter: brightness(0.5) saturate(1.2);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(8,15,40,0.88) 0%,
    rgba(5,15,40,0.65) 35%,
    rgba(5,15,40,0.65) 65%,
    rgba(8,15,40,0.88) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 48px 36px;
  max-width: 700px;
  background: rgba(5, 10, 30, 0.45);
  border-radius: 20px;
  backdrop-filter: blur(2px);
  border: 1px solid rgba(255,255,255,0.08);
}

.hero-badge {
  display: inline-block;
  background: var(--red);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  padding: 6px 18px;
  border-radius: 4px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
  color: #ffffff;
  text-shadow:
    0 2px 4px rgba(0,0,0,0.9),
    0 0 30px rgba(0,0,0,0.8),
    2px 2px 0 rgba(0,0,0,0.6);
  -webkit-text-stroke: 0.5px rgba(255,255,255,0.3);
}

.highlight {
  color: #00e5ff;
  display: block;
  text-shadow:
    0 0 30px rgba(0,229,255,0.9),
    0 0 60px rgba(0,229,255,0.5),
    0 2px 8px rgba(0,0,0,0.9),
    2px 2px 0 rgba(0,0,0,0.5);
}

.hero-saving {
  background: rgba(0,10,30,0.7);
  border: 1px solid rgba(0,229,255,0.45);
  border-radius: 10px;
  padding: 14px 22px;
  margin-bottom: 24px;
  font-size: clamp(0.85rem, 2vw, 1rem);
  color: var(--text-muted);
  line-height: 1.7;
}
.saving-amount {
  display: block;
  margin-top: 4px;
  font-size: clamp(1.1rem, 3.5vw, 1.4rem);
  color: var(--white);
  font-weight: 700;
}
.saving-amount strong {
  color: #ff2020;
  font-size: 1.5em;
  font-weight: 900;
  text-shadow: 0 0 20px rgba(255,32,32,0.6), 0 2px 4px rgba(0,0,0,0.8);
}

.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.8);
}

/* ===== RULES ===== */
.rules {
  background: linear-gradient(180deg, var(--dark2) 0%, var(--dark) 100%);
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.rule-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.rule-card-link {
  text-decoration: none;
  cursor: pointer;
  color: inherit;
}
.rule-card-link:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 18px var(--cyan-glow);
  transform: translateY(-3px);
}
.rule-card-link:active { transform: translateY(0); }

.rule-icon { font-size: 2.2rem; margin-bottom: 14px; }
.rule-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; color: var(--navy); }
.rule-card p { font-size: 0.9rem; color: var(--text-muted); flex: 1; }
.rule-cta {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.3px;
}

/* ===== CALCULATOR SECTION ===== */
.calc-section {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--dark) 0%, var(--dark2) 100%);
}

.calc-box {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  box-shadow: 0 8px 40px rgba(0,60,120,0.1);
}

.calc-step { margin-bottom: 4px; }

.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--cyan);
  color: #050d1a;
  font-weight: 900;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(0,212,255,0.4);
}

.step-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.3px;
}

.calc-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

/* Game tabs với ảnh */
.game-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 0;
}

.tab-btn {
  background: var(--dark2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.tab-btn:hover { border-color: var(--cyan); color: var(--navy); }
.tab-btn.active {
  background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
  border-color: var(--cyan);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,119,204,0.3);
}

.tab-img {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  object-fit: cover;
  object-position: top;
}

/* PC List */
.pc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 280px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan) var(--dark3);
  padding-right: 4px;
}
.pc-list::-webkit-scrollbar { width: 5px; }
.pc-list::-webkit-scrollbar-thumb { background: var(--cyan); border-radius: 4px; }

.pc-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  cursor: pointer;
  transition: all 0.18s;
}
.pc-item:hover { border-color: var(--cyan); background: var(--dark2); }
.pc-item.selected { border-color: var(--cyan); background: #e0f0ff; box-shadow: 0 0 12px rgba(0,119,204,0.15); }

.pc-item-img {
  width: 56px;
  height: 44px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
  background: var(--dark);
}

.pc-item-info { flex: 1; min-width: 0; }
.pc-item-name { font-size: 0.85rem; font-weight: 700; color: var(--navy); line-height: 1.3; margin-bottom: 3px; }
.pc-item-price { font-size: 0.82rem; color: var(--text-muted); }
.pc-item-price strong { color: var(--red); font-size: 0.95rem; font-weight: 800; }

/* Kết quả */
.calc-result {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  padding-top: 28px;
  animation: fadeIn 0.3s ease;
  background: linear-gradient(135deg, #f0f7ff, #e8f4ff);
  border-radius: 14px;
  padding: 28px;
}

.result-summary { text-align: center; }

.result-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.result-tag {
  background: rgba(0,212,255,0.1);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
}

.result-pct {
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 900;
  color: var(--red);
  text-shadow: 0 4px 14px rgba(232,0,28,0.25);
  line-height: 1;
}

.result-pc-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 20px;
}

.result-prices {
  display: inline-flex;
  flex-direction: column;
  gap: 10px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 28px;
  margin-bottom: 18px;
  min-width: 280px;
  text-align: left;
}

.rp-row { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.rp-label { font-size: 0.9rem; color: var(--text-muted); font-weight: 500; }
.rp-val { font-size: 1.05rem; font-weight: 800; color: var(--navy); }
.rp-minus { color: #d00000; font-size: 1.1rem !important; }

.rp-final-row {
  border-top: 2px solid var(--cyan);
  padding-top: 12px;
  margin-top: 6px;
  background: linear-gradient(90deg, #e8f4ff, #f0f8ff);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 8px -16px -16px -16px;
}
.rp-final {
  font-size: 1.6rem !important;
  font-weight: 900 !important;
  color: var(--cyan) !important;
  text-shadow: 0 2px 10px rgba(0,119,204,0.3);
  letter-spacing: -0.5px;
}

/* ===== RANK SECTION (legacy) ===== */
.rank-section {
  padding: 80px 0;
  background: linear-gradient(180deg, #071830 0%, var(--dark) 100%);
}

.game-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
}

.tab-btn {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 10px 22px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.tab-btn:hover { border-color: var(--cyan); color: var(--white); }
.tab-btn.active { background: linear-gradient(135deg, #005580, var(--cyan-dark)); border-color: var(--cyan); color: #fff; box-shadow: 0 0 14px var(--cyan-glow); }

.rank-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.rank-btn {
  padding: 10px 20px;
  border-radius: 8px;
  border: 2px solid transparent;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--card-bg);
  color: var(--text);
}

.rank-btn:hover, .rank-btn.selected {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
}

/* Màu theo mức giảm */
.rank-btn.tier-5  { border-color: #3a6080; color: #7aabcc; }
.rank-btn.tier-5:hover, .rank-btn.tier-5.selected  { background: #0d2a3a; border-color: #5588aa; color: #fff; }

.rank-btn.tier-8  { border-color: #00aadd; color: #00ccff; }
.rank-btn.tier-8:hover, .rank-btn.tier-8.selected  { background: #003a55; border-color: var(--cyan); color: #fff; box-shadow: 0 0 12px rgba(0,212,255,0.3); }

.rank-btn.tier-10 { border-color: #7c4fff; color: #a07aff; }
.rank-btn.tier-10:hover, .rank-btn.tier-10.selected { background: #1a0a44; border-color: #9c64f7; color: #fff; box-shadow: 0 0 12px rgba(124,79,255,0.35); }

.rank-btn.tier-12 { border-color: var(--gold); color: var(--gold); }
.rank-btn.tier-12:hover, .rank-btn.tier-12.selected { background: #2a1a00; border-color: var(--gold); color: #fff; box-shadow: 0 0 12px rgba(245,196,0,0.35); }

/* Kết quả */
.discount-result {
  background: linear-gradient(135deg, #071828, #0a1e38);
  border: 1px solid var(--cyan);
  border-radius: 16px;
  padding: 40px;
  text-align: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.result-inner { display: flex; flex-direction: column; align-items: center; gap: 12px; }

.result-rank {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.result-arrow { font-size: 2rem; color: var(--cyan); }

.result-discount {
  font-size: clamp(3rem, 10vw, 5rem);
  font-weight: 900;
  color: var(--cyan);
  text-shadow: 0 0 30px rgba(0,212,255,0.6), 0 0 60px rgba(0,212,255,0.25);
  line-height: 1;
}

.result-example {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: left;
  max-width: 500px;
  width: 100%;
  line-height: 1.8;
}
.result-example strong { color: var(--gold); }
.result-example .ex-after { color: var(--red); font-weight: 700; font-size: 1rem; }

.result-note {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 8px;
}

/* ===== PRODUCTS ===== */
.products {
  background: linear-gradient(180deg, var(--dark2) 0%, var(--dark) 100%);
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.product-scroll-box {
  max-height: 680px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--red) var(--dark3);
}
.product-scroll-box::-webkit-scrollbar { width: 6px; }
.product-scroll-box::-webkit-scrollbar-track { background: var(--dark3); border-radius: 6px; }
.product-scroll-box::-webkit-scrollbar-thumb { background: var(--red); border-radius: 6px; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 900px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .product-grid { grid-template-columns: 1fr; } }

.product-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}
.product-card:hover { transform: translateY(-4px); border-color: var(--cyan); box-shadow: 0 0 18px var(--cyan-glow); }

.product-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--dark3);
}

.product-body { padding: 18px; }

.product-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
  line-height: 1.4;
}

.product-specs {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.8;
}

.product-price {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.price-sale {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--red);
}

.price-original {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

.price-badge {
  background: var(--red);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.product-cta {
  margin-top: 14px;
  display: block;
  width: 100%;
  text-align: center;
  background: transparent;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  padding: 9px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}
.product-cta:hover { background: var(--cyan); color: #050d1a; }

/* ===== REGISTER ===== */
.register {
  padding: 80px 0;
  background: var(--dark);
}

.register-form {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.register-form input,
.register-form select {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 13px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  width: 100%;
  outline: none;
  transition: border-color 0.2s;
}
.register-form input:focus,
.register-form select:focus { border-color: var(--cyan); box-shadow: 0 0 8px var(--cyan-glow); }

.register-form select option { background: var(--dark2); }

.register-form .btn-primary { width: 100%; font-size: 1.05rem; padding: 15px; }

.form-success {
  text-align: center;
  padding: 40px;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid #00cc66;
  max-width: 560px;
  margin: 0 auto;
}
.success-icon { font-size: 3rem; margin-bottom: 14px; }
.form-success h3 { font-size: 1.4rem; margin-bottom: 8px; }
.form-success p { color: var(--text-muted); }

/* ===== FOOTER ===== */
.footer {
  background: var(--navy);
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-logo {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--cyan);
  text-shadow: 0 0 14px rgba(0,212,255,0.5);
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.footer { color: #8aaac8; }
.footer a { color: #8aaac8; }
.footer a:hover { color: var(--white); }

/* ===== STICKY BAR ===== */
.sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: linear-gradient(90deg, var(--navy) 60%, #0d2a4a);
  border-top: 2px solid var(--cyan);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  transform: translateY(100%);
  transition: transform 0.35s ease;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.6);
}
.sticky-bar.visible { transform: translateY(0); }

.sticky-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: clamp(0.78rem, 2vw, 0.95rem);
  color: var(--text-muted);
  flex: 1;
  min-width: 0;
}
.sticky-left span { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.sticky-left strong { color: var(--cyan); }

.sticky-btn {
  flex-shrink: 0;
  background: #0068ff;
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  padding: 9px 18px;
  border-radius: 6px;
  white-space: nowrap;
  transition: background 0.2s;
}
.sticky-btn:hover { background: #0055cc; }

/* ===== HOOK BANNER ===== */
.hook-banner {
  background: linear-gradient(90deg, var(--navy), #0d3060, var(--cyan-dark));
  color: #fff;
  text-align: center;
  padding: 12px 20px;
  font-size: clamp(0.8rem, 2.5vw, 1rem);
  font-weight: 600;
  letter-spacing: 0.3px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.hook-banner strong { font-size: 1.1em; }

/* ===== RESPONSIVE — MOBILE ===== */
@media (max-width: 768px) {
  .hero { min-height: 100svh; }
  .hero-images { flex-direction: row; }
  .hero-img { height: 100%; filter: brightness(0.35) saturate(1.2); }

  .rules { padding: 50px 0; }
  .rules-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .rule-card { padding: 20px 16px; }

  .calc-section { padding: 50px 0; }
  .calc-box { padding: 22px 16px; }
  .tab-btn { padding: 8px 12px; font-size: 0.78rem; }
  .tab-img { width: 28px; height: 28px; }
  .rank-grid { gap: 8px; }
  .rank-btn { padding: 8px 12px; font-size: 0.8rem; }
  .result-prices { min-width: unset; width: 100%; padding: 16px; }
  .rp-final { font-size: 1.1rem !important; }

  .products { padding: 50px 0; }
  .product-scroll-box { max-height: 520px; padding: 10px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .product-img { height: 150px; }
  .product-body { padding: 12px; }
  .product-name { font-size: 0.82rem; }
  .product-specs { font-size: 0.72rem; }
  .price-sale { font-size: 1rem; }

  .register { padding: 50px 0; }
  .form-row { grid-template-columns: 1fr; }

  .footer { padding: 30px 0; font-size: 0.82rem; }
}

@media (max-width: 400px) {
  .rules-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
}