/* ============================================================
   Xuzhou Xuzhirui Technology Co., Ltd - Common Styles
   全站公用样式（导航、页脚、分区布局、卡片、动画）
   ============================================================ */

/* ========== Reset & Base ========== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ========== Utility Classes ========== */
.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-container);
  padding-right: var(--spacing-container);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ========== 分区通用样式 ========== */
.section {
  padding-top: var(--spacing-section);
  padding-bottom: var(--spacing-section);
  position: relative;
  overflow: hidden;
}

/* 全屏背景图分区 */
.section-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
}

.section-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(38, 36, 34, 0.75) 0%,
    rgba(38, 36, 34, 0.55) 50%,
    rgba(38, 36, 34, 0.75) 100%
  );
  z-index: 1;
}

.section-hero .section-content {
  position: relative;
  z-index: 2;
}

/* 主题纯色背景分区 */
.section-solid {
  background-color: var(--color-primary);
}

/* 浅灰背景分区 */
.section-light {
  background-color: var(--color-light-gray);
}

/* ========== 卡片样式 ========== */
.card {
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-card);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.card-accent-border {
  border-left: 4px solid var(--color-accent);
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(38, 36, 34, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(184, 150, 104, 0.2);
  transition: background var(--transition-base);
}

.navbar-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-container);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--color-white);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.navbar-brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), #9B7B52);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--color-white);
  flex-shrink: 0;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.navbar-links a {
  display: block;
  padding: 0.5rem 1.125rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.78);
  letter-spacing: 0.02em;
  transition: all var(--transition-base);
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--color-accent);
  background: rgba(184, 150, 104, 0.1);
}

.navbar-links a.active {
  font-weight: 600;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-sm);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-on-accent);
}

.btn-primary:hover {
  background: #A68456;
  color: var(--color-text-on-accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(184, 150, 104, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========== 排版工具 ========== */
.text-accent {
  color: var(--color-accent);
}

.text-white {
  color: var(--color-white);
}

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

.text-sm {
  font-size: var(--font-size-sm);
}

.text-lg {
  font-size: var(--font-size-lg);
}

.text-xl {
  font-size: var(--font-size-xl);
}

.text-2xl {
  font-size: var(--font-size-2xl);
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.uppercase {
  text-transform: uppercase;
}

.letter-spacing-wide {
  letter-spacing: 0.05em;
}

.leading-relaxed {
  line-height: 1.75;
}

.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }

/* ========== 分区标题 ========== */
.section-label {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 640px;
}

.section-title-light {
  color: var(--color-text-on-dark);
}

.section-subtitle-light {
  color: rgba(244, 244, 244, 0.75);
}

/* ========== 网格 ========== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

/* ========== 页脚 ========== */
.footer {
  background-color: var(--color-dark-charcoal);
  color: rgba(244, 244, 244, 0.7);
  padding: 3rem 0;
  font-size: var(--font-size-sm);
  border-top: 1px solid rgba(184, 150, 104, 0.15);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-container);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-brand {
  font-weight: 600;
  color: var(--color-white);
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  color: rgba(244, 244, 244, 0.55);
  transition: color var(--transition-base);
}

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

.footer-divider {
  max-width: var(--container-max);
  margin: 2rem auto 0;
  padding: 0 var(--spacing-container);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  text-align: center;
  font-size: var(--font-size-xs);
  color: rgba(244, 244, 244, 0.35);
}

/* ========== 滚动渐入动画 (AOS) ========== */
[data-aos] {
  opacity: 0;
  transition-property: opacity, transform;
  transition-timing-function: ease;
}

[data-aos].aos-animate {
  opacity: 1;
  transform: none;
}

[data-aos="fade-up"] {
  transform: translateY(30px);
}

[data-aos="fade-up-sm"] {
  transform: translateY(16px);
}

[data-aos="fade-down"] {
  transform: translateY(-30px);
}

[data-aos="fade-right"] {
  transform: translateX(-30px);
}

[data-aos="fade-left"] {
  transform: translateX(30px);
}

/* ========== 分隔线装饰 ========== */
.accent-divider {
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin: 0 auto 1.5rem;
}

.accent-divider-left {
  margin-left: 0;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-section: 4rem;
    --spacing-card: 1.5rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .navbar-links {
    gap: 0;
  }

  .navbar-links a {
    padding: 0.5rem 0.75rem;
    font-size: var(--font-size-xs);
  }

  .navbar-brand {
    font-size: var(--font-size-sm);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-hero {
    min-height: 70vh;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .navbar-inner {
    flex-direction: column;
    height: auto;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    gap: 0.5rem;
  }

  .btn {
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-xs);
  }
}