.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.95rem 1.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-base);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  user-select: none;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 0; height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.5s var(--ease-out), height 0.5s var(--ease-out);
}

.btn:hover::after { width: 400px; height: 400px; }

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(255, 107, 53, 0.45);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  padding: 0.6rem 1rem;
}

.btn-ghost:hover { color: var(--color-primary); }

.btn-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  font-weight: 600;
  font-family: var(--font-display);
  transition: gap var(--transition-fast);
}

.btn-arrow:hover { gap: 0.85rem; }

.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  background: rgba(255, 210, 63, 0.20);
  color: var(--color-secondary-dark);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.tag {
  display: inline-flex;
  padding: 0.3rem 0.75rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--color-text-soft);
  border: 1px solid var(--color-border);
}

.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  display: flex;
  align-items: center;
  background: rgba(255, 248, 240, 0.85);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  background: rgba(255, 248, 240, 0.95);
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

:root[data-theme="dark"] .header { background: rgba(20, 19, 28, 0.85); }
:root[data-theme="dark"] .header.scrolled { background: rgba(20, 19, 28, 0.95); }

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-lg);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.35);
}

.logo-mark svg { width: 26px; height: 26px; }

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav-link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-soft);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  height: 2px; width: 0;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-link:hover { color: var(--color-text); }
.nav-link:hover::after { width: 100%; }

.lang-switch {
  display: flex;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  padding: 4px;
  border: 1px solid var(--color-border);
}

.lang-btn {
  padding: 0.35rem 0.85rem;
  font-size: var(--fs-xs);
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), color var(--transition-fast);
  letter-spacing: 0.05em;
}

.lang-btn.active {
  background: var(--color-text);
  color: var(--color-bg);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  position: relative;
}

.menu-toggle span {
  position: absolute;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.menu-toggle span:nth-child(1) { top: 14px; }
.menu-toggle span:nth-child(2) { top: 20px; }
.menu-toggle span:nth-child(3) { top: 26px; }

.menu-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.footer {
  padding: var(--space-7) 0 var(--space-6);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-9);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.footer-brand p { margin-top: var(--space-3); max-width: 360px; }

.footer-col h5 {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.footer-col ul li { margin-bottom: 0.5rem; }
.footer-col a { color: var(--color-text-soft); transition: color var(--transition-fast); }
.footer-col a:hover { color: var(--color-primary); }

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--grad-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 90;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  pointer-events: none;
}

.scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.scroll-top:hover { transform: translateY(-4px); }

main { padding-top: var(--header-h); }