:root {
  --bg-dark: #0a0a0c;
  --bg-card: #121318;
  --bg-card-hover: #1a1c23;
  --border-color: #262933;
  --text-main: #f0f2f5;
  --text-muted: #8c93a3;
  --accent-gold: #d4af37;
  --font-serif: 'Noto Serif SC', 'Georgia', 'Songti SC', 'SimSun', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

/* NAVBAR */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 10, 12, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  padding: 16px 0;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.logo-main {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 2px;
}

.logo-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #ffffff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* CUSTOM DROPDOWN */
.custom-dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 4px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.dropdown-btn:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 6px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  min-width: 120px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  z-index: 100;
  overflow: hidden;
}

.dropdown-content.show {
  display: block;
}

.dropdown-item {
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.dropdown-item:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

/* BUTTONS */
.btn {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 4px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background-color: #ffffff;
  color: #000000;
}

.btn-primary:hover {
  background-color: #e2e8f0;
}

.btn-outline {
  border: 1px solid var(--border-color);
  color: var(--text-main);
  background: transparent;
}

.btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.05);
}

.btn-lg {
  padding: 12px 24px;
  font-size: 0.95rem;
}

/* SECTIONS COMMON */
section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 100px 24px;
}

.section-tag {
  font-size: 0.75rem;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--text-muted);
  max-width: 600px;
  margin-top: 12px;
}

/* HERO WITH BACKGROUND.JPG */
.hero {
  position: relative;
  max-width: 100%;
  padding-top: 180px;
  padding-bottom: 80px;
  background: linear-gradient(180deg, rgba(10, 10, 12, 0.75) 100%, rgba(10, 10, 12, 0.95) 100%), 
              url('images/background.jpg') center/cover no-repeat;
}

.hero .hero-content, 
.hero .stats-bar {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.hero-tag {
  font-size: 0.8rem;
  letter-spacing: 3px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 4rem;
  line-height: 1.1;
  font-weight: 400;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 32px;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.stat-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 600;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ABOUT */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 60px;
}

.about-left h2 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  line-height: 1.2;
}

.about-lead {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 20px;
}

.about-right p {
  color: var(--text-muted);
}

.about-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
  background: var(--bg-card);
}

.pillar-card {
  padding: 12px;
}

.pillar-num {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 12px;
}

.pillar-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.pillar-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* CAPABILITIES */
.capabilities h2 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
}

.cap-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 48px;
}

.cap-card {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
  align-items: center;
}

.cap-card-reverse {
  grid-template-columns: 1.2fr 1fr;
}

.cap-card-reverse .cap-img-placeholder {
  order: 2;
}

.cap-card-reverse .cap-content {
  order: 1;
}

.cap-img-placeholder {
  width: 100%;
  height: 260px;
  background: #181a20;
  border-radius: 8px;
  overflow: hidden;
}

.cap-img-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cap-content h3 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.cap-content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.cap-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  list-style: none;
}

.cap-list li {
  font-size: 0.85rem;
  color: var(--text-main);
  position: relative;
  padding-left: 16px;
}

.cap-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* PARTNERS */
.partners-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 40px;
}

.partners h2 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-card);
}

.brand-item {
  padding: 24px 16px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-item:nth-child(6n) {
  border-right: none;
}

.partners-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 16px;
}

/* CONTACT & LINKS */
.contact h2 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
}

.contact-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.company-subname {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.contact-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.contact-info strong {
  color: var(--text-main);
}

.link-item {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dotted rgba(255, 255, 255, 0.3);
  transition: all 0.2s;
}

.link-item:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* FOOTER & ICP LINK */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  margin-top: 60px;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
}

.footer-slogan {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.footer-right {
  text-align: right;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.icp-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.icp-link:hover {
  color: #ffffff;
  text-decoration: underline;
}

/* ==========================================
   RESPONSIVE / MEDIA QUERIES
   ========================================== */

.desktop-only {
  display: flex;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  transition: all 0.3s ease;
}

.mobile-nav-actions {
  display: none;
}

/* --- 平板 (Tablet: <= 1024px) --- */
@media (max-width: 1024px) {
  section {
    padding: 70px 20px;
  }

  .hero h1 {
    font-size: 3.2rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-pillars {
    grid-template-columns: repeat(3, 1fr);
    padding: 24px;
  }

  .brands-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .brand-item:nth-child(6n) {
    border-right: 1px solid var(--border-color);
  }

  .brand-item:nth-child(3n) {
    border-right: none;
  }

  .partners-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
}

/* --- 手機 (Mobile: <= 768px) --- */
@media (max-width: 768px) {
  .desktop-only {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  /* 漢堡圖示動畫 */
  .menu-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--bg-card);
    border-left: 1px solid var(--border-color);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 24px 32px 24px;
    gap: 20px;
    transition: right 0.3s ease;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.7);
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .mobile-nav-actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 100%;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
  }

  .mobile-nav-actions .custom-dropdown,
  .mobile-nav-actions .dropdown-btn,
  .mobile-nav-actions .btn {
    width: 100%;
  }

  .mobile-nav-actions .dropdown-btn {
    justify-content: space-between;
  }

  /* Hero */
  .hero {
    padding-top: 130px;
    padding-bottom: 50px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 40px;
    padding-top: 24px;
  }

  .stat-num {
    font-size: 1.8rem;
  }

  /* About */
  .about-pillars {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* Capabilities */
  .cap-card,
  .cap-card-reverse {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 20px;
  }

  .cap-card-reverse .cap-img-placeholder {
    order: 1;
  }

  .cap-card-reverse .cap-content {
    order: 2;
  }

  .cap-img-placeholder {
    height: 180px;
  }

  .cap-list {
    grid-template-columns: 1fr;
  }

  /* Partners */
  .brands-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .brand-item:nth-child(3n) {
    border-right: 1px solid var(--border-color);
  }

  .brand-item:nth-child(2n) {
    border-right: none;
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .contact-card {
    padding: 20px;
  }

  /* Footer */
  .footer-container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

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