/* ==========================================================================
   宸和國際有限公司（CHENG HE INTERNATIONAL LTD） - 品牌官方網站樣式檔
   ========================================================================== */

/* 1. 視覺色彩與字體變數定義 (CSS Variables) */
:root {
  --color-navy: #102F45;
  --color-navy-deep: #0B2538;
  --color-navy-light: #1B4564;
  --color-gold: #E8B959;
  --color-gold-light: #F4CE7A;
  --color-gold-dark: #C89736;
  --color-ivory: #F7F5F0;
  --color-ivory-dark: #EFECE6;
  --color-white: #FFFFFF;
  --color-text: #1D2C36;
  --color-text-muted: #68737A;
  --color-line: #D9D5CA;

  --font-serif: 'Noto Serif TC', Georgia, serif;
  --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-en: 'Inter', 'Montserrat', sans-serif;

  --header-height: 80px;
  --transition-fast: 0.3s ease;
  --transition-medium: 0.5s ease;
}

/* 2. 基本全域與重置樣式 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-navy);
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

/* 鍵盤 Focus 狀態（無障礙體驗） */
*:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 4px;
}

/* 3. 背景紋理樣式 */
.bg-navy-pattern {
  background-color: var(--color-navy);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(232, 185, 89, 0.06) 0%, transparent 60%),
    linear-gradient(rgba(232, 185, 89, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 185, 89, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 80px 80px, 80px 80px;
}

.bg-ivory-pattern {
  background-color: var(--color-ivory);
  background-image: 
    linear-gradient(rgba(16, 47, 69, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 47, 69, 0.025) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px;
}

/* 金色文字漸層與裝飾線條 */
.gold-text-gradient {
  background: linear-gradient(135deg, var(--color-gold-light) 0%, var(--color-gold) 50%, var(--color-gold-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gold-divider {
  width: 64px;
  height: 3px;
  background-color: var(--color-gold);
  border-radius: 2px;
  margin: 5px auto 20px auto;
}

.gold-divider-left {
  width: 64px;
  height: 3px;
  background-color: var(--color-gold);
  border-radius: 2px;
  margin-top: 16px;
}

/* 4. HEADER 導覽列 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: all var(--transition-medium);
}

.site-header.scrolled {
  padding: 14px 0;
  background-color: rgba(16, 47, 69, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(232, 185, 89, 0.15);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  height: 40px;
  width: auto;
  transition: height var(--transition-fast);
}

.site-header.scrolled .header-logo {
  height: 34px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title-zh {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-ivory);
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.brand-title-en {
  font-family: var(--font-en);
  font-size: 0.65rem;
  color: rgba(232, 185, 89, 0.85);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.brand-logo-link:hover .brand-title-zh {
  color: var(--color-gold);
}

/* 桌機選單 */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: rgba(247, 245, 240, 0.8);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

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

.nav-link.active::after,
.nav-link:hover::after {
  transform: scaleX(1);
}

/* 行動版漢堡按鈕 */
.mobile-menu-btn {
  display: none;
  color: var(--color-ivory);
  padding: 8px;
  border-radius: 4px;
}

.mobile-menu-btn:hover {
  color: var(--color-gold);
}

.hamburger-icon {
  width: 26px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transition: all var(--transition-fast);
}

.mobile-menu-btn.active .line-1 {
  transform: translateY(9px) rotate(45deg);
}

.mobile-menu-btn.active .line-2 {
  opacity: 0;
}

.mobile-menu-btn.active .line-3 {
  transform: translateY(-9px) rotate(-45deg);
}

/* 行動版抽屜選單 Drawer */
.mobile-menu-drawer {
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(11, 37, 56, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 99;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-t: 1px solid rgba(232, 185, 89, 0.15);
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.mobile-nav-link {
  font-family: var(--font-en);
  font-size: 1.25rem;
  letter-spacing: 0.15em;
  color: var(--color-ivory);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(232, 185, 89, 0.1);
  transition: color var(--transition-fast);
}

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

.mobile-nav-num {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: rgba(232, 185, 89, 0.6);
}

.mobile-menu-footer {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(232, 185, 89, 0.15);
}

.mobile-menu-footer p {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--color-gold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* 5. HERO 區塊 */
.hero-section {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 120px 24px 40px 24px;
  color: var(--color-ivory);
  overflow: hidden;
}

/* 裝飾線條線框 */
.hero-frame-tl {
  position: absolute;
  top: 32px;
  left: 32px;
  width: 120px;
  height: 120px;
  border-top: 1px solid rgba(232, 185, 89, 0.15);
  border-left: 1px solid rgba(232, 185, 89, 0.15);
  pointer-events: none;
}

.hero-frame-br {
  position: absolute;
  bottom: 32px;
  right: 32px;
  width: 120px;
  height: 120px;
  border-bottom: 1px solid rgba(232, 185, 89, 0.15);
  border-right: 1px solid rgba(232, 185, 89, 0.15);
  pointer-events: none;
}

.hero-content {
  margin: auto 0;
  text-align: center;
  max-width: 800px;
  z-index: 2;
}

.hero-logo-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: -50px;
}

.hero-logo {
  width: 420px;
  max-width: 85vw;
  height: auto;
  filter: drop-shadow(0 10px 25px rgba(0, 0, 0, 0.5));
  transition: transform var(--transition-medium);
}

.hero-logo:hover {
  transform: scale(1.015);
}

.hero-tagline {
  font-family: var(--font-en);
  font-size: 1rem;
  color: var(--color-gold);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-weight: 500;
}

/* 向下捲動提示 */
.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
  color: rgba(247, 245, 240, 0.6);
  transition: color var(--transition-fast);
}

.scroll-indicator:hover {
  color: var(--color-gold);
}

.scroll-text {
  font-family: var(--font-en);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(232, 185, 89, 0.85);
}

.scroll-arrow-box {
  width: 22px;
  height: 36px;
  border: 1px solid rgba(232, 185, 89, 0.35);
  border-radius: 20px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 6px;
  transition: border-color var(--transition-fast);
}

.scroll-indicator:hover .scroll-arrow-box {
  border-color: var(--color-gold);
}

.scroll-dot {
  width: 4px;
  height: 8px;
  background-color: var(--color-gold);
  border-radius: 2px;
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.4; }
  100% { transform: translateY(0); opacity: 1; }
}

/* 6. ABOUT US 區塊 */
.about-section {
  position: relative;
  padding: 140px 24px;
  border-top: 1px solid rgba(217, 213, 202, 0.4);
}

.about-container {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 4fr 7fr;
  gap: 60px;
  align-items: start;
}

.section-tag {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-gold-dark);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: 0.05em;
  line-height: 1.3;
}

.section-title-dark {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-ivory);
  letter-spacing: 0.05em;
  line-height: 1.3;
}

.about-text-content {
  display: flex;
  flex-direction: column;
  gap: 28px;
  font-size: 1.1rem;
  color: rgba(29, 44, 54, 0.9);
  line-height: 1.9;
}

.highlight-underline {
  position: relative;
  display: inline-block;
  font-weight: 600;
  color: var(--color-navy);
}

.highlight-underline::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 6px;
  background-color: rgba(232, 185, 89, 0.35);
  border-radius: 2px;
  z-index: -1;
}

.about-highlights-bar {
  margin-top: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.highlights-list {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-navy);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.highlight-bullet {
  width: 8px;
  height: 8px;
  background-color: var(--color-gold);
  border-radius: 50%;
}

.highlight-separator {
  color: var(--color-gold);
  font-weight: 300;
}

/* 7. SERVICE 區塊 */
.service-section {
  position: relative;
  padding: 140px 24px;
  background-color: var(--color-ivory);
}

.service-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 70px auto;
}

.service-lead-text {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-top: 16px;
}

.service-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

/* 服務卡片 Card */
.service-card {
  position: relative;
  background-color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(217, 213, 202, 0.7);
  border-radius: 12px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-medium);
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
}

.service-card-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-medium);
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-gold);
  box-shadow: 0 16px 35px rgba(16, 47, 69, 0.1);
}

.service-card:hover .service-card-bar {
  transform: scaleX(1);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.card-number {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.1em;
}

.card-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background-color: rgba(16, 47, 69, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-navy);
  transition: all var(--transition-medium);
}

.service-card:hover .card-icon-box {
  background-color: var(--color-navy);
  color: var(--color-gold);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 14px;
  transition: color var(--transition-fast);
}

.service-card:hover .card-title {
  color: var(--color-gold-dark);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.card-footer {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid rgba(217, 213, 202, 0.4);
  text-align: right;
}

.card-footer span {
  font-family: var(--font-en);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: rgba(232, 185, 89, 0.7);
  text-transform: uppercase;
}

/* 8. CONTACT US 區塊 */
.contact-section {
  position: relative;
  padding: 140px 24px;
  color: var(--color-ivory);
  border-top: 1px solid rgba(232, 185, 89, 0.15);
}

.contact-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.contact-lead-text {
  font-size: 1.15rem;
  color: rgba(247, 245, 240, 0.85);
  margin-top: 20px;
  margin-bottom: 40px;
}

.email-box-card {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  padding: 32px 40px;
  background-color: rgba(11, 37, 56, 0.85);
  border: 1px solid rgba(232, 185, 89, 0.3);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  margin-bottom: 36px;
  transition: border-color var(--transition-medium);
}

.email-box-card:hover {
  border-color: var(--color-gold);
}

.email-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: rgba(232, 185, 89, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gold);
}

.email-info {
  text-align: left;
}

.email-label {
  font-family: var(--font-en);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(232, 185, 89, 0.75);
  text-transform: uppercase;
  display: block;
}

.email-address {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-ivory);
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.email-address:hover {
  color: var(--color-gold);
}

.email-button-wrapper {
  margin-top: 12px;
}

.email-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 36px;
  border-radius: 40px;
  background: linear-gradient(135deg, #F4CE7A 0%, #E8B959 50%, #C89736 100%);
  color: var(--color-navy);
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  box-shadow: 0 10px 25px rgba(232, 185, 89, 0.25);
  transition: all var(--transition-fast);
}

.email-cta-button:hover {
  transform: translateY(-2px) scale(1.02);
  filter: brightness(1.08);
  box-shadow: 0 14px 30px rgba(232, 185, 89, 0.35);
}

/* 9. FOOTER 頁尾 */
.site-footer {
  background-color: var(--color-navy-deep);
  color: rgba(247, 245, 240, 0.6);
  padding: 48px 24px;
  border-top: 1px solid rgba(232, 185, 89, 0.1);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand-zh {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-ivory);
  font-weight: 600;
}

.footer-brand-en {
  font-family: var(--font-en);
  font-size: 0.7rem;
  color: rgba(232, 185, 89, 0.8);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.footer-brand-add {
  font-family: var(--font-serif);
  font-size: 0.65rem;
  color: var(--color-ivory);
  font-weight: 600;
}

.footer-copyright {
  font-family: var(--font-en);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

/* 10. BACK TO TOP 按鈕 */
.back-to-top-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 90;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: rgba(11, 37, 56, 0.9);
  color: var(--color-gold);
  border: 1px solid rgba(232, 185, 89, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: all var(--transition-fast);
}

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

.back-to-top-btn:hover {
  background-color: var(--color-gold);
  color: var(--color-navy);
  transform: scale(1.1);
}

/* 11. 響應式 RWD 媒體查詢 (Media Queries) */
@media (max-width: 992px) {
  .about-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero-section {
    padding-top: 100px;
  }

  .hero-logo {
    width: 290px;
  }

  .hero-tagline {
    font-size: 0.85rem;
    letter-spacing: 0.2em;
  }

  .section-title,
  .section-title-dark {
    font-size: 1.85rem;
  }

  .service-grid {
    grid-template-columns: 1fr;
  }

  .email-box-card {
    flex-direction: column;
    padding: 28px 20px;
    text-align: center;
    width: 100%;
  }

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

  .email-address {
    font-size: 1rem;
  }

  .footer-container {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}

/* 無障礙設定: 減速動畫 support */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}