/* ========================================
   燕赵风官网 - 通用样式
   ======================================== */

/* ---- CSS Variables ---- */
:root {
  --yzf-primary: #C84B31;
  --yzf-gold: #8B7355;
  --yzf-dark: #1A1A2E;
  --yzf-light-bg: #FAFAF5;
  --yzf-text: #333333;
  --yzf-text-muted: #666666;
}

/* ---- Global ---- */
html, body {
  overflow-x: hidden;
}

/* ---- Navbar ---- */
.navbar-yzf {
  transition: background-color 0.4s, box-shadow 0.4s;
  padding: .75rem 0;
}
.navbar-yzf.navbar-scrolled {
  background-color: rgba(255,255,255,.95) !important;
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
}
.navbar-yzf .navbar-brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
}
.navbar-yzf .brand-logo {
  height: 36px;
}
.navbar-yzf .brand-logo-alt {
  display: none;
}
.navbar-yzf.navbar-scrolled .brand-logo {
  display: none;
}
.navbar-yzf.navbar-scrolled .brand-logo-alt {
  display: inline-block;
}
.navbar-yzf .brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.navbar-yzf .brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  transition: color .4s;
  letter-spacing: .1em;
}
.navbar-yzf.navbar-scrolled .brand-name {
  color: var(--yzf-dark);
}
.navbar-yzf .brand-sub {
  font-size: .7rem;
  color: rgba(255,255,255,.75);
  transition: color .4s;
  letter-spacing: .05em;
}
.navbar-yzf.navbar-scrolled .brand-sub {
  color: var(--yzf-text-muted);
}
.navbar-yzf .nav-link {
  color: rgba(255,255,255,.85);
  font-size: .9rem;
  padding: .5rem 1rem !important;
  transition: color .3s;
  position: relative;
}
.navbar-yzf .nav-link::after {
  content: '';
  position: absolute;
  bottom: .25rem;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--yzf-primary);
  transform: scaleX(0);
  transition: transform .3s;
}
.navbar-yzf .nav-link:hover::after,
.navbar-yzf .nav-link.active::after {
  transform: scaleX(1);
}
.navbar-yzf .nav-link.active {
  color: #fff;
  font-weight: 600;
}
.navbar-yzf.navbar-scrolled .nav-link {
  color: var(--yzf-text);
}
.navbar-yzf.navbar-scrolled .nav-link.active {
  color: var(--yzf-primary);
  font-weight: 600;
}
.navbar-yzf .nav-link:hover {
  color: var(--yzf-primary);
}
.navbar-yzf .navbar-toggler {
  border-color: rgba(255,255,255,.3);
}
.navbar-yzf.navbar-scrolled .navbar-toggler {
  border-color: rgba(0,0,0,.15);
}
.navbar-yzf .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255,255,255,0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.navbar-yzf.navbar-scrolled .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%280,0,0,0.6%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ---- Sections ---- */
section {
  padding: 5rem 0;
}
.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: .5rem;
  color: var(--yzf-dark);
  letter-spacing: .05em;
}
.section-subtitle {
  text-align: center;
  color: var(--yzf-text-muted);
  margin-bottom: 3rem;
  font-size: .95rem;
}
.section-divider {
  width: 40px;
  height: 3px;
  background: var(--yzf-primary);
  margin: 1rem auto 2rem;
  border: none;
}

/* ---- Buttons ---- */
.btn-yzf {
  background: var(--yzf-primary);
  color: #fff;
  border: none;
  padding: .6rem 1.75rem;
  border-radius: 2rem;
  font-size: .9rem;
  transition: background .3s, transform .2s;
}
.btn-yzf:hover {
  background: #a83d27;
  color: #fff;
  transform: translateY(-1px);
}
.btn-yzf-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,.5);
  padding: .6rem 1.75rem;
  border-radius: 2rem;
  font-size: .9rem;
  transition: background .3s, color .3s;
}
.btn-yzf-outline:hover {
  background: #fff;
  color: var(--yzf-dark);
}

/* ---- Back to Top ---- */
.btn-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--yzf-primary);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s, visibility .3s, transform .3s;
  z-index: 1050;
  box-shadow: 0 2px 10px rgba(0,0,0,.2);
  cursor: pointer;
}
.btn-top.show {
  opacity: 1;
  visibility: visible;
}
.btn-top:hover {
  background: #a83d27;
  transform: translateY(-2px);
}

/* ---- Footer ---- */
footer {
  background: var(--yzf-dark);
  color: rgba(255,255,255,.7);
  padding: 3rem 0 1.5rem;
}
footer .footer-brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .1em;
}
footer .footer-brand small {
  display: block;
  font-weight: 400;
  font-size: .75rem;
  color: rgba(255,255,255,.5);
  margin-top: .25rem;
  letter-spacing: 0;
}
footer a {
  color: rgba(255,255,255,.6);
  text-decoration: none;
  font-size: .9rem;
  transition: color .3s;
}
footer a:hover {
  color: #fff;
}
footer hr {
  border-color: rgba(255,255,255,.1);
}
footer .copyright {
  font-size: .8rem;
  color: rgba(255,255,255,.4);
}
footer .footer-slogan {
  font-size: .85rem;
  color: rgba(255,255,255,.5);
}

/* ---- Responsive ---- */
@media (max-width: 767.98px) {
  section {
    padding: 3rem 0;
  }
  .section-title {
    font-size: 1.5rem;
  }
}