/* ============================================================
   HHpoker/德扑圈 - Steampunk Mechanical Gear Theme
   Brass, Copper, Bronze Metallics on Dark Iron Backgrounds
   ============================================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  --bg-dark: #1a1a1a;
  --bg-iron: #2c2416;
  --bg-panel: #1f1a10;
  --gold-brass: #c5a44e;
  --gold-bright: #d4af37;
  --copper: #b87333;
  --copper-light: #d4845a;
  --bronze: #8c5a35;
  --bronze-light: #a67c52;
  --text-primary: #f0e6d2;
  --text-secondary: #c4b998;
  --text-muted: #8a7d6b;
  --accent-red: #8b3a3a;
  --border-metal: #4a3b28;
  --border-brass: #7a6a3a;
  --shadow-metal: rgba(0,0,0,0.5);
  --shadow-gold: rgba(197,164,78,0.15);
  --font-display: 'Cinzel', 'Playfair Display', serif;
  --font-body: 'Crimson Text', 'Lora', serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* --- Selection --- */
::selection {
  background: var(--copper);
  color: #fff;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--bronze);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--copper);
}

/* --- Typography Helpers --- */
.font-display {
  font-family: var(--font-display);
}
.text-gold {
  color: var(--gold-brass);
}
.text-copper {
  color: var(--copper);
}
.text-bronze {
  color: var(--bronze-light);
}

/* --- Gear Pattern Background --- */
.gear-bg {
  position: relative;
  background-color: var(--bg-iron);
}
.gear-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image:
    radial-gradient(circle at 20% 30%, var(--gold-brass) 1px, transparent 1px),
    radial-gradient(circle at 80% 70%, var(--copper) 1px, transparent 1px),
    radial-gradient(circle at 40% 80%, var(--bronze-light) 1px, transparent 1px),
    radial-gradient(circle at 60% 20%, var(--gold-bright) 1px, transparent 1px);
  background-size: 60px 60px, 80px 80px, 100px 100px, 70px 70px;
  pointer-events: none;
  z-index: 0;
}

/* --- Metallic Border Effect --- */
.metal-border {
  position: relative;
  border: 2px solid var(--border-metal);
  box-shadow:
    inset 0 0 20px var(--shadow-metal),
    0 0 10px var(--shadow-gold);
}
.metal-border::after {
  content: '';
  position: absolute;
  inset: -4px;
  border: 1px solid var(--border-brass);
  pointer-events: none;
  opacity: 0.5;
}

/* --- Rivet Decoration --- */
.rivet {
  position: absolute;
  width: 8px;
  height: 8px;
  background: radial-gradient(circle at 40% 40%, var(--gold-bright), var(--bronze));
  border-radius: 50%;
  box-shadow: 0 1px 2px var(--shadow-metal);
  z-index: 2;
}

/* --- Section Divider --- */
.section-divider {
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--bronze) 20%,
    var(--gold-brass) 50%,
    var(--bronze) 80%,
    transparent 100%
  );
  margin: 0;
  border: none;
}

/* --- Gear Decorative Element --- */
.gear-decor {
  display: inline-block;
  width: 60px;
  height: 60px;
  position: relative;
  opacity: 0.3;
}
.gear-decor::before {
  content: '\f013';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: 48px;
  color: var(--gold-brass);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* ============================================================
   NAVIGATION BAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-brass);
  box-shadow: 0 4px 20px var(--shadow-metal);
  transition: all 0.3s ease;
}
.navbar.scrolled {
  background: rgba(26, 26, 26, 0.98);
  border-bottom-color: var(--gold-brass);
}

.nav-link {
  position: relative;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.3s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gold-brass);
  transition: width 0.3s ease;
}
.nav-link:hover {
  color: var(--gold-brass);
}
.nav-link:hover::after {
  width: 100%;
}

/* --- Hamburger --- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  cursor: pointer;
  z-index: 1001;
  background: transparent;
  border: 1px solid var(--border-brass);
  border-radius: 4px;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gold-brass);
  margin: 3px 0;
  transition: all 0.3s ease;
  border-radius: 1px;
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* --- Mobile Menu --- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 26, 26, 0.98);
  backdrop-filter: blur(16px);
  z-index: 999;
  padding-top: 80px;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 1rem;
}
.mobile-menu.active {
  display: flex;
}
.mobile-menu .mobile-nav-link {
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.75rem 2rem;
  border-bottom: 1px solid var(--border-metal);
  width: 80%;
  text-align: center;
  transition: color 0.3s ease;
}
.mobile-menu .mobile-nav-link:hover {
  color: var(--gold-brass);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: var(--bg-dark);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26,26,26,0.92) 0%,
    rgba(44,36,22,0.85) 40%,
    rgba(26,26,26,0.9) 70%,
    rgba(31,26,16,0.88) 100%
  );
  z-index: 1;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  object-fit: cover;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 1rem;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: var(--gold-bright);
  text-shadow:
    0 2px 10px var(--shadow-gold),
    0 4px 30px var(--shadow-metal);
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}
.hero-subtitle {
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  letter-spacing: 0.04em;
}
.hero-btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--copper) 0%, var(--bronze) 100%);
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 2px solid var(--gold-brass);
  border-radius: 4px;
  cursor: pointer;
  box-shadow:
    0 4px 15px var(--shadow-metal),
    inset 0 1px 0 rgba(255,255,255,0.1);
  transition: all 0.3s ease;
  text-decoration: none;
}
.hero-btn:hover {
  background: linear-gradient(135deg, var(--copper-light) 0%, var(--bronze-light) 100%);
  border-color: var(--gold-bright);
  box-shadow:
    0 6px 25px var(--shadow-metal),
    0 0 30px var(--shadow-gold),
    inset 0 1px 0 rgba(255,255,255,0.15);
  transform: translateY(-2px);
}

/* --- Floating Gear Animation in Hero --- */
.floating-gear {
  position: absolute;
  z-index: 0;
  opacity: 0.06;
  pointer-events: none;
}
.floating-gear.g1 {
  top: 10%;
  left: 5%;
  width: 200px;
  height: 200px;
  animation: spin-slow 30s linear infinite;
}
.floating-gear.g2 {
  bottom: 15%;
  right: 8%;
  width: 160px;
  height: 160px;
  animation: spin-slow 25s linear infinite reverse;
}
.floating-gear.g3 {
  top: 40%;
  right: 20%;
  width: 100px;
  height: 100px;
  animation: spin-slow 20s linear infinite;
}

@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ============================================================
   FEATURES SECTION
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.feature-card {
  background: var(--bg-panel);
  border: 2px solid var(--border-metal);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
  box-shadow: 0 4px 15px var(--shadow-metal);
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--copper), var(--gold-brass), var(--bronze));
  opacity: 0;
  transition: opacity 0.4s ease;
}
.feature-card:hover {
  border-color: var(--border-brass);
  box-shadow:
    0 8px 30px var(--shadow-metal),
    0 0 25px var(--shadow-gold);
  transform: translateY(-5px);
}
.feature-card:hover::before {
  opacity: 1;
}
.feature-card.visible {
  animation: fadeInUp 0.6s ease forwards;
}
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, var(--copper-light), var(--bronze));
  border: 2px solid var(--gold-brass);
  margin-bottom: 1.25rem;
  font-size: 1.75rem;
  color: #fff;
  box-shadow: 0 4px 12px var(--shadow-metal);
}
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--gold-brass);
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}
.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ============================================================
   STATS / COUNTER SECTION
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.stat-item {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-metal);
  border-radius: 8px;
  position: relative;
}
.stat-item::after {
  content: '';
  position: absolute;
  inset: -2px;
  border: 1px solid var(--border-brass);
  border-radius: 10px;
  pointer-events: none;
  opacity: 0.3;
}
.stat-number {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--gold-bright);
  line-height: 1;
  text-shadow: 0 0 20px var(--shadow-gold);
}
.stat-suffix {
  font-size: 2rem;
}
.stat-label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

/* ============================================================
   TESTIMONIALS SECTION
   ============================================================ */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.testimonial-card {
  background: var(--bg-panel);
  border: 2px solid var(--border-metal);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px var(--shadow-metal);
}
.testimonial-card:hover {
  border-color: var(--border-brass);
  box-shadow: 0 8px 25px var(--shadow-metal), 0 0 20px var(--shadow-gold);
}
.testimonial-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 3px solid var(--gold-brass);
  margin: 0 auto 1rem;
  object-fit: cover;
  box-shadow: 0 0 15px var(--shadow-gold);
}
.testimonial-stars {
  color: var(--gold-brass);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}
.testimonial-text {
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.8;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}
.testimonial-name {
  font-family: var(--font-display);
  color: var(--gold-brass);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}
.testimonial-role {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ============================================================
   FAQ ACCORDION
   ============================================================ */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--border-metal);
  border-radius: 6px;
  margin-bottom: 0.75rem;
  background: var(--bg-panel);
  overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item.active {
  border-color: var(--border-brass);
  box-shadow: 0 0 15px var(--shadow-gold);
}
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-align: left;
  transition: color 0.3s ease;
}
.faq-question:hover {
  color: var(--gold-brass);
}
.faq-item.active .faq-question {
  color: var(--gold-brass);
}
.faq-icon {
  font-size: 1rem;
  color: var(--gold-brass);
  transition: transform 0.35s ease;
  flex-shrink: 0;
  margin-left: 1rem;
}
.faq-item.active .faq-icon {
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}
.faq-item.active .faq-answer {
  max-height: 500px;
}
.faq-answer-inner {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-muted);
  line-height: 1.9;
  font-size: 0.95rem;
  border-top: 1px solid var(--border-metal);
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section {
  position: relative;
  background: linear-gradient(135deg, var(--bg-iron) 0%, var(--bg-panel) 50%, var(--bg-dark) 100%);
  text-align: center;
  padding: 5rem 1rem;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image:
    radial-gradient(circle at 30% 40%, var(--gold-brass) 1px, transparent 1px),
    radial-gradient(circle at 70% 60%, var(--copper) 1px, transparent 1px);
  background-size: 40px 40px, 55px 55px;
  pointer-events: none;
}
.cta-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--gold-bright);
  text-shadow: 0 0 25px var(--shadow-gold);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}
.cta-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.cta-btn {
  display: inline-block;
  padding: 1rem 3rem;
  background: linear-gradient(135deg, var(--gold-brass) 0%, var(--copper) 100%);
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 2px solid var(--gold-bright);
  border-radius: 4px;
  cursor: pointer;
  box-shadow:
    0 6px 20px var(--shadow-metal),
    0 0 30px var(--shadow-gold);
  transition: all 0.3s ease;
  text-decoration: none;
}
.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow:
    0 10px 30px var(--shadow-metal),
    0 0 45px var(--shadow-gold);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: #111111;
  border-top: 3px solid var(--border-brass);
  padding: 4rem 1rem 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}
.footer-col h4 {
  font-family: var(--font-display);
  color: var(--gold-brass);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}
.footer-col p,
.footer-col a {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 2;
  text-decoration: none;
  display: block;
  transition: color 0.3s ease;
}
.footer-col a:hover {
  color: var(--gold-brass);
}
.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 3rem;
  border-top: 1px solid var(--border-metal);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ============================================================
   FLOATING BUTTONS
   ============================================================ */
.floating-cs-btn {
  position: fixed;
  bottom: 100px;
  right: 24px;
  z-index: 999;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--copper) 0%, var(--bronze) 100%);
  border: 2px solid var(--gold-brass);
  color: #fff;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--shadow-metal), 0 0 15px var(--shadow-gold);
  transition: all 0.3s ease;
  animation: float 3s ease-in-out infinite;
}
.floating-cs-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 25px var(--shadow-metal), 0 0 25px var(--shadow-gold);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 24px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-panel);
  border: 2px solid var(--border-brass);
  color: var(--gold-brass);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px var(--shadow-metal);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--copper);
  color: #fff;
  border-color: var(--gold-bright);
}

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  color: var(--gold-bright);
  text-align: center;
  text-shadow: 0 0 20px var(--shadow-gold);
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.section-subtitle {
  color: var(--text-secondary);
  text-align: center;
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto 3rem;
  letter-spacing: 0.04em;
}

.section-padding {
  padding: 5rem 1rem;
}

/* --- Gear divider line between sections --- */
.gear-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}
.gear-divider .line {
  width: 60px;
  height: 2px;
  background: var(--bronze);
}
.gear-divider .icon {
  color: var(--gold-brass);
  font-size: 1.2rem;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  .nav-links-desktop {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .section-padding {
    padding: 3rem 1rem;
  }
  .hero-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .cta-btn {
    padding: 0.85rem 2rem;
    font-size: 1rem;
  }
  .feature-card {
    padding: 1.5rem;
  }
}