/* === COMMON STYLES — russianring.ru promo === */
:root {
  --primary: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-soft: rgba(59,130,246,.08);
  --accent: #ef4444;
  --accent-dark: #dc2626;
  --purple: #8b5cf6;
  --purple-dark: #6d28d9;
  --green: #10b981;
  --green-dark: #059669;
  --amber: #f59e0b;
  --amber-dark: #d97706;
  --text: #1e293b;
  --text-dim: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --bg-soft: #f1f5f9;
  --white: #fff;
  --shadow-sm: 0 2px 8px rgba(15,23,42,.06);
  --shadow-md: 0 8px 24px rgba(15,23,42,.08);
  --shadow-lg: 0 20px 50px rgba(59,130,246,.18);
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--white);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

/* ===== HEADER ===== */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--text);
  flex-shrink: 0;
}

.logo:hover { text-decoration: none; }

.logo img {
  max-height: 44px;
  height: auto;
}

.beta-badge {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  margin-left: 0.5rem;
}

.nav-menu {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-link {
  color: var(--text-dim);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--primary);
  background: var(--primary-soft);
  text-decoration: none;
}

.nav-link.active {
  color: var(--primary);
  background: var(--primary-soft);
  font-weight: 600;
}

.user-actions { display: flex; align-items: center; flex-shrink: 0; }
.mobile-cta { display: none; }
.mobile-menu-toggle { display: none; }

/* ===== BUTTONS ===== */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-family: inherit;
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.4);
}

.btn-outline {
  border: 2px solid var(--primary);
  background: var(--white);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
}

.btn-large {
  padding: 1.25rem 2.5rem;
  font-size: 1.1rem;
}

.btn-white {
  background: var(--white);
  color: var(--primary);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}

/* ===== LAYOUT ===== */
.section { padding: 5rem 0; }
.section.alt { background: var(--bg); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-pre {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text);
  letter-spacing: -0.015em;
  line-height: 1.15;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-dim);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ===== GRIDS ===== */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== CARDS ===== */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: 0.25s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.card:hover {
  border-color: rgba(59,130,246,.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card:hover::before { transform: scaleX(1); }

.card .icon-wrap {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  margin-bottom: 18px;
}

.card .icon-wrap svg { width: 24px; height: 24px; }

.card.accent .icon-wrap { background: rgba(239,68,68,.09); color: var(--accent); }
.card.purple .icon-wrap { background: rgba(139,92,246,.1); color: var(--purple); }
.card.green .icon-wrap { background: rgba(16,185,129,.1); color: var(--green); }
.card.amber .icon-wrap { background: rgba(245,158,11,.1); color: var(--amber); }

.card h3 { margin: 0 0 10px; font-size: 18px; color: var(--text); font-weight: 700; }
.card p { margin: 0 0 14px; color: var(--text-dim); font-size: 14.5px; line-height: 1.55; }
.card p:last-child { margin-bottom: 0; }

.card ul { margin: 0; padding: 0; list-style: none; }
.card ul li {
  position: relative;
  padding: 6px 0 6px 22px;
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.5;
}
.card ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 13px;
  width: 12px; height: 2px;
  background: var(--primary);
  border-radius: 2px;
}
.card.accent ul li::before { background: var(--accent); }
.card.purple ul li::before { background: var(--purple); }
.card.green ul li::before { background: var(--green); }
.card.amber ul li::before { background: var(--amber); }

/* ===== FEATURE BLOCKS ===== */
.feature {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 22px;
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 28px;
  align-items: start;
  transition: 0.25s;
}

.feature:hover {
  border-color: rgba(59,130,246,.3);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-ico {
  width: 72px; height: 72px;
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 10px 24px rgba(59,130,246,.3);
}

.feature-ico svg { width: 32px; height: 32px; stroke-width: 2; }

.feature.accent .feature-ico { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); box-shadow: 0 10px 24px rgba(239,68,68,.3); }
.feature.purple .feature-ico { background: linear-gradient(135deg, var(--purple), var(--purple-dark)); box-shadow: 0 10px 24px rgba(139,92,246,.3); }
.feature.green .feature-ico { background: linear-gradient(135deg, var(--green), var(--green-dark)); box-shadow: 0 10px 24px rgba(16,185,129,.3); }
.feature.amber .feature-ico { background: linear-gradient(135deg, var(--amber), var(--amber-dark)); box-shadow: 0 10px 24px rgba(245,158,11,.3); }

.feature h3 { margin: 0 0 6px; font-size: 22px; font-weight: 800; color: var(--text); }
.feature .sub { font-size: 13px; color: var(--primary); font-weight: 600; margin-bottom: 14px; text-transform: uppercase; letter-spacing: 0.05em; }
.feature.accent .sub { color: var(--accent); }
.feature.purple .sub { color: var(--purple); }
.feature.green .sub { color: var(--green); }
.feature.amber .sub { color: var(--amber); }
.feature .desc { color: var(--text-dim); font-size: 15px; margin-bottom: 20px; line-height: 1.65; }

.feat-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 24px;
  margin: 0; padding: 0;
  list-style: none;
}

.feat-list li {
  position: relative;
  padding: 5px 0 5px 26px;
  font-size: 14px;
  color: var(--text);
  line-height: 1.5;
}

.feat-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 10px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--primary-soft);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>");
  background-size: 10px 10px;
  background-position: center;
  background-repeat: no-repeat;
}

.feature.accent .feat-list li::before { background-color: rgba(239,68,68,.1); background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ef4444' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>"); }
.feature.purple .feat-list li::before { background-color: rgba(139,92,246,.12); background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238b5cf6' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>"); }
.feature.green .feat-list li::before { background-color: rgba(16,185,129,.12); background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2310b981' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>"); }
.feature.amber .feat-list li::before { background-color: rgba(245,158,11,.12); background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f59e0b' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>"); }

/* ===== BREADCRUMBS ===== */
.breadcrumb {
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--text-dim); margin: 0 0.5rem; }

/* ===== BETA CTA BLOCK ===== */
.beta-cta-block {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 24px;
  padding: 3.5rem 2.5rem;
  color: white;
  text-align: center;
  margin: 4rem 0 0;
}

.beta-cta-block h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 1rem;
  color: white;
  line-height: 1.2;
}

.beta-cta-block p {
  font-size: 1.0625rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.beta-cta-block .btn-white {
  font-size: 1.05rem;
  padding: 1rem 2.5rem;
  font-weight: 700;
}

.beta-cta-block .hint {
  font-size: 0.8125rem;
  margin-top: 1.25rem;
  opacity: 0.8;
}

/* ===== INTERNAL LINKS ===== */
.page-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 2rem;
}

.page-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  transition: 0.2s;
  box-shadow: var(--shadow-sm);
}

.page-link:hover {
  border-color: rgba(59,130,246,.3);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--primary);
}

.page-link .pl-icon {
  width: 42px; height: 42px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  flex-shrink: 0;
}

.page-link .pl-icon svg { width: 20px; height: 20px; }

/* ===== FOOTER ===== */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
  font-weight: 500;
  font-size: 0.9375rem;
}

.footer-links a:hover { color: var(--primary); }

.footer-bottom {
  color: var(--text-dim);
  font-size: 0.875rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p { line-height: 1.6; }

/* ===== RANKS ROW ===== */
.ranks { display: grid; grid-template-columns: repeat(6,1fr); gap: 12px; margin-top: 28px; }
.rank { text-align: center; padding: 24px 14px; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.rank-orb { width: 52px; height: 52px; border-radius: 14px; margin: 0 auto 12px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 13px; }
.rank:nth-child(1) .rank-orb { background: linear-gradient(135deg,#94a3b8,#64748b); }
.rank:nth-child(2) .rank-orb { background: linear-gradient(135deg,#22c55e,#16a34a); }
.rank:nth-child(3) .rank-orb { background: linear-gradient(135deg,#3b82f6,#2563eb); }
.rank:nth-child(4) .rank-orb { background: linear-gradient(135deg,#8b5cf6,#6d28d9); }
.rank:nth-child(5) .rank-orb { background: linear-gradient(135deg,#f59e0b,#d97706); }
.rank:nth-child(6) .rank-orb { background: linear-gradient(135deg,#ef4444,#dc2626); }
.rank strong { display: block; font-size: 14px; color: var(--text); font-weight: 700; margin-bottom: 4px; }
.rank span { font-size: 12px; color: var(--text-dim); }

/* ===== VIP CARDS ===== */
.vip-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.vip { background: var(--white); border: 1px solid var(--border); border-radius: 18px; padding: 32px 28px; box-shadow: var(--shadow-sm); position: relative; overflow: hidden; transition: 0.25s; }
.vip::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg,var(--primary),var(--purple)); }
.vip.blogger::before { background: linear-gradient(90deg,var(--purple),var(--accent)); }
.vip.host::before { background: linear-gradient(90deg,var(--green),var(--primary)); }
.vip:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(59,130,246,.3); }
.vip-crown { width: 56px; height: 56px; border-radius: 14px; background: linear-gradient(135deg,var(--primary),var(--purple)); color: #fff; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; box-shadow: 0 8px 20px rgba(59,130,246,.3); }
.vip.blogger .vip-crown { background: linear-gradient(135deg,var(--purple),var(--accent)); box-shadow: 0 8px 20px rgba(139,92,246,.3); }
.vip.host .vip-crown { background: linear-gradient(135deg,var(--green),var(--primary)); box-shadow: 0 8px 20px rgba(16,185,129,.3); }
.vip-crown svg { width: 26px; height: 26px; }
.vip h3 { margin: 0 0 6px; font-size: 22px; font-weight: 800; color: var(--text); }
.vip .vip-tag { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--primary); margin-bottom: 14px; }
.vip.blogger .vip-tag { color: var(--purple); }
.vip.host .vip-tag { color: var(--green); }
.vip p { margin: 0 0 18px; font-size: 14.5px; color: var(--text-dim); line-height: 1.6; }
.vip ul { margin: 0; padding: 0; list-style: none; }
.vip ul li { position: relative; padding: 6px 0 6px 22px; font-size: 13.5px; color: var(--text-dim); line-height: 1.5; }
.vip ul li::before { content: ""; position: absolute; left: 0; top: 13px; width: 12px; height: 2px; background: var(--primary); }
.vip.blogger ul li::before { background: var(--purple); }
.vip.host ul li::before { background: var(--green); }

/* ===== ROADMAP ===== */
.roadmap { position: relative; padding-left: 32px; }
.roadmap::before { content: ""; position: absolute; left: 11px; top: 10px; bottom: 10px; width: 2px; background: var(--border); }
.step { position: relative; margin-bottom: 22px; padding: 22px 26px; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.step::before { content: ""; position: absolute; left: -27px; top: 26px; width: 18px; height: 18px; border-radius: 50%; background: var(--white); border: 2px solid var(--border); }
.step.done::before { background: #22c55e; border-color: #22c55e; }
.step.now::before { background: var(--primary); border-color: var(--primary); box-shadow: 0 0 0 5px rgba(59,130,246,.2); }
.step h4 { margin: 0 0 8px; font-size: 17px; color: var(--text); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.step h4 .step-tag { font-size: 11px; padding: 4px 11px; border-radius: 999px; background: var(--bg-soft); color: var(--text-muted); font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
.step.done h4 .step-tag { background: rgba(34,197,94,.12); color: #16a34a; }
.step.now h4 .step-tag { background: var(--primary-soft); color: var(--primary); }
.step p { margin: 0 0 10px; color: var(--text-dim); font-size: 14px; }
.step p:last-child { margin-bottom: 0; }
.step ul { margin: 8px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2,1fr); gap: 4px 18px; }
.step ul li { position: relative; padding: 4px 0 4px 18px; font-size: 13.5px; color: var(--text-dim); }
.step ul li::before { content: "\2192"; position: absolute; left: 0; top: 4px; color: var(--primary); font-weight: 700; }

/* ===== COMPARE TABLE ===== */
.compare-wrap { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); overflow: hidden; }
.compare-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.compare-table { width: 100%; border-collapse: collapse; min-width: 900px; font-size: 14px; }
.compare-table th, .compare-table td { padding: 14px 16px; text-align: center; border-bottom: 1px solid var(--border); vertical-align: middle; }
.compare-table th:first-child, .compare-table td:first-child { text-align: left; font-weight: 600; color: var(--text); min-width: 220px; }
.compare-table thead th { background: var(--bg); color: var(--text); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.03em; white-space: nowrap; border-bottom: 2px solid var(--border); }
.compare-table thead th.me { background: linear-gradient(135deg,var(--primary),var(--primary-dark)); color: #fff; }
.compare-table thead th.banned::after { content: "*"; color: var(--accent); font-weight: 800; margin-left: 3px; }
.compare-table tbody tr:hover { background: var(--bg); }
.compare-table td.me { background: rgba(59,130,246,.04); font-weight: 600; color: var(--primary); }
.compare-table .yes { color: var(--green); font-size: 18px; font-weight: 700; }
.compare-table .no { color: #cbd5e1; font-size: 16px; }
.compare-table .partial { color: var(--amber); font-size: 13px; font-weight: 600; }
.compare-table .star { color: var(--primary); font-size: 16px; font-weight: 700; }
.compare-legend { display: flex; flex-wrap: wrap; gap: 18px; padding: 18px 22px; background: var(--bg); border-top: 1px solid var(--border); font-size: 13px; color: var(--text-dim); }
.compare-legend span { display: inline-flex; align-items: center; gap: 6px; }
.compare-legend b { color: var(--text); }
.compare-footnote { margin-top: 18px; padding: 16px 20px; background: rgba(239,68,68,.05); border: 1px solid rgba(239,68,68,.2); border-radius: 10px; font-size: 13px; color: var(--text-dim); line-height: 1.6; }
.compare-footnote strong { color: var(--accent); }

/* ===== DIFF BLOCK ===== */
.diff-block { margin-top: 40px; }
.diff-question { display: flex; gap: 20px; align-items: flex-start; padding: 28px 32px; margin-bottom: 32px; background: linear-gradient(135deg,rgba(59,130,246,.06),rgba(239,68,68,.04)); border: 1px solid rgba(59,130,246,.2); border-radius: 18px; }
.diff-question > svg { width: 36px; height: 36px; flex-shrink: 0; color: var(--primary); padding: 6px; background: var(--white); border-radius: 10px; box-shadow: var(--shadow-sm); }
.diff-question h3 { margin: 0 0 10px; font-size: 20px; color: var(--text); font-weight: 800; line-height: 1.3; }
.diff-question p { margin: 0; font-size: 15px; color: var(--text-dim); line-height: 1.65; }
.diff-question p strong { color: var(--text); }
.diff-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; margin-bottom: 28px; }
.diff-item { position: relative; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 26px 26px 84px; box-shadow: var(--shadow-sm); transition: 0.2s; }
.diff-item:hover { transform: translateY(-3px); border-color: rgba(59,130,246,.3); box-shadow: var(--shadow-md); }
.diff-item .diff-num { position: absolute; left: 22px; top: 24px; width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg,var(--primary),var(--primary-dark)); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; box-shadow: 0 6px 16px rgba(59,130,246,.3); }
.diff-item:nth-child(2n) .diff-num { background: linear-gradient(135deg,var(--accent),var(--accent-dark)); box-shadow: 0 6px 16px rgba(239,68,68,.3); }
.diff-item:nth-child(3n) .diff-num { background: linear-gradient(135deg,var(--purple),var(--purple-dark)); box-shadow: 0 6px 16px rgba(139,92,246,.3); }
.diff-item:nth-child(5n) .diff-num { background: linear-gradient(135deg,var(--green),var(--green-dark)); box-shadow: 0 6px 16px rgba(16,185,129,.3); }
.diff-item h4 { margin: 0 0 8px; font-size: 16px; font-weight: 800; color: var(--text); line-height: 1.3; }
.diff-item p { margin: 0; font-size: 14px; color: var(--text-dim); line-height: 1.6; }
.diff-summary { display: flex; gap: 18px; align-items: flex-start; padding: 24px 28px; background: var(--text); color: #fff; border-radius: var(--radius); }
.diff-summary svg { width: 28px; height: 28px; flex-shrink: 0; color: var(--accent); margin-top: 2px; }
.diff-summary strong { color: #fff; font-weight: 800; }
.diff-summary > div { font-size: 15px; line-height: 1.65; color: #cbd5e1; }

/* ===== AI HERO ===== */
.ai-hero { background: linear-gradient(135deg,#1e293b,#0f172a); color: #fff; border-radius: 18px; padding: 48px; margin-bottom: 32px; position: relative; overflow: hidden; }
.ai-hero::before { content: ""; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle,rgba(59,130,246,.35),transparent 60%); pointer-events: none; }
.ai-hero::after { content: ""; position: absolute; bottom: -40%; left: -10%; width: 500px; height: 500px; background: radial-gradient(circle,rgba(239,68,68,.25),transparent 60%); pointer-events: none; }
.ai-hero > * { position: relative; z-index: 1; }
.ai-hero .ai-label { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); border-radius: 999px; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 18px; }
.ai-hero h3 { margin: 0 0 14px; font-size: clamp(24px,3vw,34px); font-weight: 800; letter-spacing: -0.01em; line-height: 1.15; }
.ai-hero p { margin: 0 0 18px; font-size: 16px; color: #cbd5e1; max-width: 720px; line-height: 1.65; }
.ai-hero .hint { font-size: 13px; color: #94a3b8; font-style: italic; }

/* ===== ECO TAGLINE ===== */
.eco-tagline { text-align: center; margin: 36px 0; padding: 24px 28px; background: var(--white); border: 1px dashed var(--primary); border-radius: var(--radius); color: var(--text); font-size: 17px; font-weight: 600; }
.eco-tagline .grad-txt, .grad-txt { background: linear-gradient(90deg,var(--primary),var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

/* ===== NOTIFICATION ===== */
.notification {
  position: fixed;
  top: 20px; right: 20px;
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  z-index: 10000;
  max-width: 400px;
  font-weight: 500;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1100px) {
  .nav-menu { gap: 0.125rem; }
  .nav-link { font-size: 0.8125rem; padding: 0.4rem 0.5rem; }
}

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .vip-grid { grid-template-columns: 1fr; }
  .ranks { grid-template-columns: repeat(3, 1fr); }
  .diff-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-container { padding: 0.75rem 1rem; }
  .logo { font-size: 1.125rem; }
  .logo img { max-height: 36px; }
  .nav-menu { display: none; }
  .user-actions .btn { display: none; }
  .mobile-cta { display: block; }
  .mobile-cta .btn { padding: 0.5rem 1rem; font-size: 0.8125rem; }

  .section { padding: 3rem 0; }
  .container { padding: 0 1rem; }
  .section-title { font-size: 1.5rem; }

  .grid-2 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .feature { grid-template-columns: 1fr; padding: 26px; gap: 18px; }
  .feat-list { grid-template-columns: 1fr; }
  .step ul { grid-template-columns: 1fr; }
  .ranks { grid-template-columns: repeat(2, 1fr); }

  .beta-cta-block { padding: 2.5rem 1.5rem; border-radius: 18px; }
  .beta-cta-block h2 { font-size: 1.375rem; }

  .footer { padding: 2rem 0 1.5rem; }
  .footer-links { flex-direction: column; gap: 1rem; }

  .diff-question { flex-direction: column; padding: 20px; }
  .diff-item { padding: 72px 22px 22px; }
  .diff-item .diff-num { top: 22px; left: 22px; }

  .ai-hero { padding: 28px 22px; }
}

@media (max-width: 480px) {
  .section-title { font-size: 1.375rem; }
  .card { padding: 20px; }
  .ranks { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { font-size: 0.8125rem; }
  .btn-large { padding: 0.875rem 1.25rem; font-size: 0.9375rem; }
}