/* =========================================================
   翥牌酒业 - 全局设计系统
   风格：中国红 + 帝王金 + 玄黑，传统与现代融合
   ========================================================= */

:root {
  /* 主色：传统中国红与帝王金 */
  --color-primary: #8B1A1A;        /* 深朱红 - 品牌主色 */
  --color-primary-dark: #5C0F0F;   /* 暗朱红 */
  --color-primary-light: #B83232;  /* 亮朱红 */
  --color-gold: #C9A961;           /* 帝王金 */
  --color-gold-dark: #8C7438;      /* 暗金 */
  --color-gold-light: #E5CC85;     /* 亮金 */

  /* 辅助色 */
  --color-ink: #1A1A1A;            /* 玄墨黑 */
  --color-ink-soft: #2C2C2C;
  --color-cream: #F8F4EB;          /* 米黄宣纸 */
  --color-cream-dark: #EFE7D3;
  --color-paper: #FFFCF5;
  --color-gray: #6B6B6B;
  --color-gray-light: #B8B8B8;
  --color-line: #E5DFD0;           /* 描边 - 暖灰金 */

  /* 字号 */
  --fs-hero: clamp(2.5rem, 6vw, 4.5rem);
  --fs-h1: clamp(2rem, 4.5vw, 3.25rem);
  --fs-h2: clamp(1.5rem, 3.5vw, 2.5rem);
  --fs-h3: clamp(1.25rem, 2.5vw, 1.75rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;

  /* 间距 */
  --space-section: clamp(4rem, 10vw, 7rem);
  --space-container: clamp(1rem, 4vw, 2rem);

  /* 字体 */
  --font-display: "STKaiti", "KaiTi", "楷体", "Songti SC", "STSong", "FangSong", serif;
  --font-body: "STSong", "SimSun", "Songti SC", "Noto Serif SC", "Source Han Serif CN", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(139, 26, 26, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 26, 0.08);
  --shadow-lg: 0 20px 50px rgba(26, 26, 26, 0.15);
  --shadow-gold: 0 8px 32px rgba(201, 169, 97, 0.25);

  /* 过渡 */
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* =========================================================
   基础重置
   ========================================================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--color-ink);
  background: var(--color-paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* =========================================================
   工具类
   ========================================================= */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-container);
}

.section {
  padding: var(--space-section) 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 0.5rem;
  font-weight: 400;
  letter-spacing: 0.15em;
}

.section-subtitle {
  text-align: center;
  color: var(--color-gold-dark);
  font-size: var(--fs-small);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin-bottom: 3rem;
  position: relative;
}

.section-subtitle::before,
.section-subtitle::after {
  content: "";
  display: inline-block;
  width: 40px;
  height: 1px;
  background: var(--color-gold);
  vertical-align: middle;
  margin: 0 1rem;
}

/* 分割线装饰 */
.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 1.5rem auto 3rem;
  max-width: 200px;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.divider-icon {
  color: var(--color-gold);
  font-size: 1.25rem;
}

/* =========================================================
   导航栏
   ========================================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.25rem 0;
  background: rgba(255, 252, 245, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 0.75rem 0;
  background: rgba(255, 252, 245, 0.95);
  border-bottom-color: var(--color-line);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-container);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-logo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-paper);
}

.nav-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-brand-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.nav-brand-tagline {
  font-size: 0.7rem;
  color: var(--color-gold-dark);
  letter-spacing: 0.3em;
  margin-top: 2px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-ink);
  position: relative;
  padding: 0.5rem 0;
  letter-spacing: 0.1em;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-ink);
  transition: var(--transition-fast);
}

/* =========================================================
   按钮
   ========================================================= */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1rem;
  padding: 0.875rem 2.5rem;
  letter-spacing: 0.2em;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-cream);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-cream);
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-ink);
  border-color: var(--color-gold);
}

.btn-gold:hover {
  background: var(--color-gold-dark);
  color: var(--color-cream);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

/* =========================================================
   页脚
   ========================================================= */
.footer {
  background: linear-gradient(180deg, var(--color-ink) 0%, #0a0a0a 100%);
  color: var(--color-cream);
  padding: 4rem 0 1.5rem;
  position: relative;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-gold), var(--color-primary), var(--color-gold), transparent);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-logo {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-cream);
  padding: 4px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-gold);
  letter-spacing: 0.1em;
}

.footer-brand-tagline {
  font-size: 0.8rem;
  color: var(--color-gray-light);
  letter-spacing: 0.3em;
  margin-top: 4px;
}

.footer-desc {
  color: var(--color-gray-light);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-top: 1rem;
  opacity: 0.85;
}

.footer-title {
  font-family: var(--font-display);
  color: var(--color-gold);
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  letter-spacing: 0.15em;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--color-gray-light);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-gold);
  padding-left: 0.5rem;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
  color: var(--color-gray-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-contact-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-gold);
}

.footer-bottom {
  border-top: 1px solid rgba(201, 169, 97, 0.2);
  padding-top: 1.5rem;
  text-align: center;
  color: var(--color-gray-light);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.footer-bottom a {
  color: var(--color-gold);
}

/* =========================================================
   装饰元素
   ========================================================= */
.ornament {
  text-align: center;
  color: var(--color-gold);
  font-size: 1.5rem;
  margin: 1rem 0;
  letter-spacing: 1rem;
  opacity: 0.6;
}

.vertical-text {
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 0.4em;
}

/* =========================================================
   动画
   ========================================================= */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.fade-up {
  animation: fadeUp 0.8s ease-out forwards;
}

.fade-in {
  animation: fadeIn 1.2s ease-out forwards;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 968px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-paper);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--color-line);
    transform: translateY(-150%);
    transition: var(--transition);
    box-shadow: var(--shadow-md);
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-brand-tagline {
    display: none;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section-subtitle::before,
  .section-subtitle::after {
    width: 20px;
  }
}