/* ===== style.css for spin-bbin.com ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

:root {
  --bg: #f8f9fa;
  --bg2: #ffffff;
  --text: #1a1a2e;
  --text2: #4a4a6a;
  --primary: #1a1a2e;
  --accent: #f0c040;
  --accent2: #e6a800;
  --glass: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
  --gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

.dark {
  --bg: #0d0d1a;
  --bg2: #1a1a2e;
  --text: #f0f0f5;
  --text2: #b0b0c8;
  --glass: rgba(26, 26, 46, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent2);
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  position: relative;
}

h2::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  font-weight: 600;
  margin-bottom: 16px;
}

.glass {
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.btn {
  display: inline-block;
  padding: 14px 36px;
  background: var(--accent);
  color: var(--primary);
  font-weight: 700;
  border-radius: 50px;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  text-align: center;
}

.btn:hover {
  background: var(--accent2);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(240, 192, 64, 0.4);
}

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

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

.grid {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  padding: 32px;
  background: var(--bg2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

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

.mt-2 {
  margin-top: 16px;
}

.mt-4 {
  margin-top: 32px;
}

.mb-2 {
  margin-bottom: 16px;
}

.mb-4 {
  margin-bottom: 32px;
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Header ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo svg {
  width: 36px;
  height: 36px;
}

nav {
  display: flex;
  gap: 8px;
  align-items: center;
}

nav a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition);
}

nav a:hover, nav a.active {
  background: var(--accent);
  color: var(--primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text);
  cursor: pointer;
  padding: 4px;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg2);
    padding: 16px;
    border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: var(--shadow);
  }
  nav.open {
    display: flex;
  }
  nav a {
    padding: 12px 16px;
    width: 100%;
  }
}

/* ===== Banner ===== */
.banner {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  color: #fff;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(240, 192, 64, 0.15) 0%, transparent 60%),
              radial-gradient(circle at 80% 50%, rgba(15, 52, 96, 0.3) 0%, transparent 50%);
  pointer-events: none;
}

.banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 40px 24px;
}

.banner h1 {
  color: #fff;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.banner p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.banner .btn {
  margin-top: 16px;
}

.banner-slide {
  display: none;
  animation: fadeSlide 0.8s ease;
}

.banner-slide.active {
  display: block;
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.banner-dots {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  cursor: pointer;
  transition: all var(--transition);
}

.dot.active {
  background: var(--accent);
  transform: scale(1.2);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 8px;
}

/* ===== Section variants ===== */
.section-light {
  background: var(--bg2);
}

.section-dark {
  background: var(--gradient);
  color: #fff;
}

.section-dark h2 {
  color: #fff;
}

.section-dark h2::after {
  background: var(--accent);
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.about-text p {
  margin-bottom: 16px;
  color: var(--text2);
}

.about-svg {
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-svg svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* ===== Product card ===== */
.product-card {
  text-align: center;
  padding: 40px 24px;
}

.product-card svg {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  color: var(--accent);
}

.product-card h3 {
  margin-bottom: 12px;
}

.product-card p {
  color: var(--text2);
  font-size: 0.95rem;
}

/* ===== Team ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.team-card {
  text-align: center;
  padding: 32px 20px;
}

.team-card svg {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--accent);
  padding: 12px;
}

.team-card h3 {
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.team-card p {
  color: var(--text2);
  font-size: 0.9rem;
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  cursor: pointer;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1.1rem;
}

.faq-question span {
  font-size: 1.5rem;
  transition: transform var(--transition);
}

.faq-item.open .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding-top: 0;
  color: rgba(255, 255, 255, 0.75);
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding-top: 16px;
}

/* ===== How-to steps ===== */
.howto-steps {
  counter-reset: step;
  display: grid;
  gap: 24px;
}

.howto-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  background: var(--bg2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.howto-step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--primary);
  font-weight: 800;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.howto-step h4 {
  font-weight: 600;
  margin-bottom: 8px;
}

.howto-step p {
  color: var(--text2);
  font-size: 0.95rem;
}

/* ===== News card ===== */
.news-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.news-card .date {
  font-size: 0.85rem;
  color: var(--text2);
  margin-bottom: 8px;
}

.news-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.news-card p {
  color: var(--text2);
  font-size: 0.95rem;
  flex-grow: 1;
  margin-bottom: 16px;
}

.news-card .btn {
  padding: 8px 20px;
  font-size: 0.9rem;
}

/* ===== Testimonial ===== */
.testimonial-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.testimonial-card svg {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--accent);
  padding: 8px;
}

.testimonial-card p {
  font-style: italic;
  color: var(--text2);
  margin-bottom: 16px;
}

.testimonial-card h4 {
  font-weight: 600;
  color: var(--accent);
}

/* ===== Footer ===== */
footer {
  background: var(--primary);
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 30px;
}

footer a {
  color: rgba(255, 255, 255, 0.7);
}

footer a:hover {
  color: var(--accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: #fff;
  font-weight: 700;
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
}

.footer-bottom a {
  margin: 0 8px;
}

.qr-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.qr-code {
  width: 100px;
  height: 100px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  padding: 8px;
}

.qr-code svg {
  width: 60px;
  height: 60px;
}

.qr-code span {
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ===== Back to top ===== */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--primary);
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  z-index: 999;
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent2);
  transform: translateY(-4px);
}

/* ===== Dark toggle ===== */
.dark-toggle {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.dark-toggle:hover {
  background: rgba(240, 192, 64, 0.2);
}

/* ===== Search box ===== */
.search-box {
  display: flex;
  gap: 8px;
  align-items: center;
}

.search-box input {
  padding: 8px 16px;
  border-radius: 50px;
  border: 1px solid var(--glass-border);
  background: var(--bg2);
  color: var(--text);
  font-size: 0.9rem;
  width: 200px;
  transition: width var(--transition);
}

.search-box input:focus {
  width: 260px;
  outline: none;
  border-color: var(--accent);
}

.search-box button {
  background: var(--accent);
  border: none;
  border-radius: 50px;
  padding: 8px 16px;
  color: var(--primary);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.search-box button:hover {
  background: var(--accent2);
}

@media (max-width: 600px) {
  .search-box input {
    width: 120px;
  }
  .search-box input:focus {
    width: 160px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== Scroll animation ===== */
.scroll-animate {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}