/* ============================================
   摇钱速AI - 官方网站样式
   Design: 黄金熔炉中的数字矩阵
   ============================================ */

/* ---- Reset & Base ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: rgba(255, 245, 245, 0.96);
  --gold-start: #E60012;
  --gold-end: #FF4D4F;
  --ice-blue: #D7000F;
  --text-primary: #1F2937;
  --text-secondary: #4B5563;
  --text-dim: #9CA3AF;
  --border-subtle: rgba(230, 0, 18, 0.14);
  --border-glow: rgba(230, 0, 18, 0.42);
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 8px 28px rgba(230, 0, 18, 0.08);
  --shadow-glow: 0 0 30px rgba(230, 0, 18, 0.16);
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-cn);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ---- Utility ---- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s var(--ease-smooth);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0; left: -100%; width: 200%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s var(--ease-smooth);
  z-index: -1;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(230, 0, 18, 0.28);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--border-glow);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s var(--ease-smooth);
}

.btn-secondary:hover {
  background: rgba(230, 0, 18, 0.08);
  border-color: var(--gold-start);
  transform: translateY(-2px);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 48px;
}

/* ---- Scroll Reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Navigation ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(230, 0, 18, 0.06);
  transition: all 0.35s var(--ease-smooth);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-bottom: 1px solid rgba(230, 0, 18, 0.12);
  box-shadow: 0 10px 30px rgba(230, 0, 18, 0.08);
  padding: 10px 0;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 18px rgba(230, 0, 18, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  color: #374151;
  font-weight: 600;
  transition: color 0.25s var(--ease-smooth), background 0.25s var(--ease-smooth);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end));
  transition: width 0.3s var(--ease-smooth);
}

.nav-links a:hover {
  color: var(--gold-start);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px !important;
  font-size: 0.9rem !important;
  box-shadow: 0 8px 20px rgba(230, 0, 18, 0.18);
}

.nav-links .nav-cta {
  color: #FFFFFF;
}

.nav-links .nav-cta::after {
  display: none;
}

.nav-links .nav-cta:hover {
  color: #FFFFFF;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: rgba(230, 0, 18, 0.06);
  border: 1px solid rgba(230, 0, 18, 0.12);
  border-radius: 10px;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gold-start);
  border-radius: 2px;
  transition: all 0.3s var(--ease-smooth);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 8s ease-in-out infinite alternate;
}

.hero-bg-orb--gold {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--gold-start), transparent 70%);
  top: -10%;
  left: 20%;
}

.hero-bg-orb--blue {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--ice-blue), transparent 70%);
  bottom: 5%;
  right: 15%;
  animation-delay: -3s;
}

.hero-bg-orb--amber {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--gold-end), transparent 70%);
  top: 40%;
  right: 30%;
  animation-delay: -5s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.1); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(230, 0, 18, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 0, 18, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(230, 0, 18, 0.08);
  border: 1px solid rgba(230, 0, 18, 0.18);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--gold-start);
  margin-bottom: 28px;
  animation: badgePulse 3s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(230, 0, 18, 0.16); }
  50% { box-shadow: 0 0 0 8px rgba(230, 0, 18, 0); }
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--gold-start);
  border-radius: 50%;
  animation: dotBlink 1.5s ease-in-out infinite;
}

@keyframes dotBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero h1 .line-accent {
  display: block;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border-subtle);
}

.hero-stat {
  text-align: center;
}

.hero-stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---- Features ---- */
.features {
  padding: 100px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all 0.35s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, transparent, rgba(230, 0, 18, 0.22), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.35s var(--ease-smooth);
}

.feature-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, rgba(230, 0, 18, 0.08), rgba(255, 77, 79, 0.06));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.35s var(--ease-smooth);
}

.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, rgba(230, 0, 18, 0.14), rgba(255, 77, 79, 0.12));
  box-shadow: 0 0 20px rgba(230, 0, 18, 0.14);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--gold-start);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.feature-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.72rem;
  color: var(--gold-start);
  background: rgba(230, 0, 18, 0.08);
  border-radius: 50px;
  margin-top: 10px;
}

/* ---- Advantages ---- */
.advantages {
  padding: 100px 0;
  position: relative;
}

.advantages::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  transition: all 0.35s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.advantage-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end));
  transform: scaleX(0);
  transition: transform 0.4s var(--ease-smooth);
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.advantage-card:hover::after {
  transform: scaleX(1);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.advantage-icon svg {
  width: 32px;
  height: 32px;
  stroke: #FFFFFF;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.advantage-card h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.advantage-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.advantage-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.advantage-highlights span {
  padding: 4px 12px;
  font-size: 0.78rem;
  background: rgba(230, 0, 18, 0.06);
  border: 1px solid rgba(230, 0, 18, 0.14);
  border-radius: 50px;
  color: var(--ice-blue);
}

/* ---- Topics ---- */
.topics {
  padding: 100px 0;
  position: relative;
}

.topics::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.topics-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 16px;
}

.topics-tabs {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.topics-tab {
  padding: 8px 20px;
  font-size: 0.88rem;
  background: rgba(230, 0, 18, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: 50px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.25s var(--ease-smooth);
}

.topics-tab:hover,
.topics-tab.active {
  background: rgba(230, 0, 18, 0.12);
  border-color: var(--gold-start);
  color: var(--gold-start);
}

.topics-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.topic-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all 0.25s var(--ease-smooth);
  cursor: pointer;
}

.topic-item:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateX(4px);
}

.topic-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, rgba(230, 0, 18, 0.12), rgba(255, 77, 79, 0.08));
  color: var(--gold-start);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}

.topic-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.5;
  transition: color 0.25s var(--ease-smooth);
}

.topic-item:hover .topic-text {
  color: var(--text-primary);
}

/* ---- AIGC Tools ---- */
.tools {
  padding: 100px 0;
  position: relative;
}

.tools::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.tool-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 16px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all 0.3s var(--ease-smooth);
  cursor: pointer;
}

.tool-item:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.tool-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-icon svg {
  width: 36px;
  height: 36px;
  stroke: var(--gold-start);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tool-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  transition: color 0.25s var(--ease-smooth);
}

.tool-item:hover .tool-name {
  color: var(--text-primary);
}

/* ---- Guide ---- */
.guide {
  padding: 100px 0;
  position: relative;
}

.guide::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  position: relative;
}

.guide-steps::before {
  content: '';
  position: absolute;
  top: 50px;
  left: 16.6%;
  width: 66.8%;
  height: 2px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end), var(--gold-start));
}

.guide-step {
  text-align: center;
  position: relative;
}

.guide-step-num {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  font-weight: 900;
  color: #FFFFFF;
  position: relative;
  z-index: 1;
}

.guide-step h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.guide-step p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 280px;
  margin: 0 auto;
}

/* ---- CTA Section ---- */
.cta-section {
  padding: 100px 0;
  text-align: center;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.cta-box {
  background: linear-gradient(135deg, rgba(230, 0, 18, 0.06), rgba(255, 77, 79, 0.04));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 64px 40px;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(230, 0, 18, 0.06), transparent 50%);
  animation: ctaGlow 6s ease-in-out infinite alternate;
}

@keyframes ctaGlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(5%, 3%); }
}

.cta-box h2 {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 16px;
  position: relative;
}

.cta-box p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 36px;
  position: relative;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

/* ---- Footer ---- */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer-links-group {
  display: flex;
  gap: 64px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 4px 0;
  transition: color 0.25s var(--ease-smooth);
}

.footer-col a:hover {
  color: var(--gold-start);
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copyright {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s var(--ease-smooth);
}

.footer-social a:hover {
  border-color: var(--gold-start);
  background: rgba(230, 0, 18, 0.08);
}

.footer-social a svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-secondary);
  fill: none;
  stroke-width: 1.8;
}

.footer-social a:hover svg {
  stroke: var(--gold-start);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .tools-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 768px) {
  html { font-size: 15px; }

  .nav-links { display: none; }
  .nav-cta-desktop { display: none; }
  .mobile-menu-btn { display: flex; }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(230, 0, 18, 0.12);
    box-shadow: 0 16px 30px rgba(230, 0, 18, 0.08);
  }

  .hero h1 { font-size: 2.4rem; }
  .hero-stats { gap: 28px; }
  .hero-stat-num { font-size: 1.5rem; }

  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: 1fr; }
  .topics-list { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
  .guide-steps { grid-template-columns: 1fr; gap: 40px; }
  .guide-steps::before { display: none; }

  .section-title { font-size: 1.8rem; }

  .footer-content { flex-direction: column; }
  .footer-links-group { gap: 40px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .features-grid { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-actions { flex-direction: column; align-items: center; }
  .cta-actions { flex-direction: column; align-items: center; }
}