/* ==========================================================================
   HUMBO TECHNOLOGY — GLOBAL THEME STYLESHEET (MEDIA-TEK PARADIGM)
   ========================================================================== */

/* ── DESIGN TOKENS ── */
:root {
  --navy:        #0a1628;
  --navy-2:      #0c1e3a;
  --deep:        #0f2044;
  --blue:        #1a4a8a;
  --accent:      #38bdf8;
  --accent-2:    #0ea5e9;
  --teal:        #06b6d4;
  --gold:        #f59e0b;
  --light:       #e8f4fd;
  --white:       #ffffff;
  --gray:        #64748b;
  --light-gray:  #f8fafc;
  --text:        #1e293b;
  --muted:       #94a3b8;
  --border:      rgba(56,189,248,0.18);
  --card-bg:     #112240;
  --card-shadow: 0 10px 30px -15px rgba(2,12,27,0.7);
  --transition:  all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* ── BASE RESET ── */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Manrope', 'Noto Sans TC', sans-serif;
  background: var(--white);
  color: var(--text);
  overflow-x: hidden;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── LAYOUT CONTAINERS & SECTIONS ── */
.container-center {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.section {
  padding-top: 90px;
  padding-bottom: 90px;
  position: relative;
}

@media (max-width: 767px) {
  .section {
    padding-top: 50px;
    padding-bottom: 50px;
  }
}

.section-dark {
  background: var(--navy);
  color: var(--white);
}

.section-deep {
  background: var(--deep);
  color: var(--white);
}

.section-light {
  background: var(--light-gray);
  color: var(--text);
}

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

.section-header {
  margin-bottom: 48px;
  text-align: center;
}

.section-title {
  font-family: 'Manrope', 'Noto Sans TC', sans-serif;
  font-weight: 800;
  font-size: 2.2rem;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.section-subtitle {
  color: var(--muted);
  font-size: 1.05rem;
  margin-top: 12px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ── GRID SYSTEM ── */
.grid-2-col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.grid-3-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

@media (max-width: 1024px) {
  .grid-3-col {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .grid-2-col, .grid-3-col {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ── PREMIUM NAVIGATION BAR ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: 72px;
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  z-index: 1010;
}

.nav-logo img {
  height: 38px;
  width: auto;
  object-fit: contain;
}

.nav-logo .brand {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-logo .brand-en {
  color: var(--white);
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
}

.nav-logo .brand-zh {
  color: var(--accent);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  margin-top: 2px;
  font-weight: 500;
}

.nav-links a {
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.nav-links a, .nav-links button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px 20px;
  color: rgba(255, 255, 255, 0.65);
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 20px;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover, .nav-links button:hover {
  color: var(--white);
  background: rgba(56, 189, 248, 0.08);
}

.nav-links a.active, .nav-links button.active {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.12);
}

/* Globe Language Switcher Dropdown */
.lang-dropdown {
  position: relative;
  display: inline-block;
  margin-left: 16px;
}

.lang-btn {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.3s ease;
  width: 38px;
  height: 38px;
}

.lang-btn:hover, .lang-dropdown.active .lang-btn {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

.lang-btn svg.globe-icon {
  width: 20px;
  height: 20px;
}

.lang-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  background: rgba(10, 25, 47, 0.95);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 12px;
  padding: 8px 0;
  min-width: 130px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1100;
  transform: translateY(10px);
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.lang-dropdown.active .lang-dropdown-menu {
  display: block;
  transform: translateY(0);
  opacity: 1;
}

.lang-dropdown-menu button {
  display: block;
  width: 100%;
  padding: 10px 16px;
  background: none;
  border: none;
  text-align: left;
  color: rgba(255, 255, 255, 0.8);
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-dropdown-menu button:hover {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

.lang-dropdown-menu button.active {
  color: var(--accent);
  font-weight: 700;
  background: rgba(56, 189, 248, 0.12);
}

/* Hamburger mobile menu button */
.hamburger-menu {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1010;
}

.hamburger-menu span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--white);
  border-radius: 1px;
  transition: var(--transition);
}

@media (max-width: 900px) {
  .hamburger-menu {
    display: flex;
  }

  .nav-links a {
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--navy-2);
    border-left: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 100px 30px 40px;
    gap: 16px;
    transition: var(--transition);
  }

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

  .nav-links a, .nav-links button {
    width: 100%;
    text-align: left;
    padding: 12px 20px;
    border-radius: 8px;
  }

  .lang-dropdown {
    margin-left: auto;
    margin-right: 16px;
  }
}

/* Hamburger animation */
.hamburger-menu.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Hide brand subtitle for EN/JA in navigation logo */
html[lang="en"] .nav-logo .brand-zh,
html[lang="ja"] .nav-logo .brand-zh {
  display: none;
}

/* ── PREMIUM CARD & BOX DESIGNS ── */
.card-premium {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card-premium:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px -20px rgba(56, 189, 248, 0.4);
  border-color: rgba(56, 189, 248, 0.4);
}

.card-premium::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--teal));
  opacity: 0;
  transition: var(--transition);
}

.card-premium:hover::before {
  opacity: 1;
}

/* ── BUTTONS & CTAs ── */
.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  color: var(--navy);
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 30px;
  border: none;
  cursor: pointer;
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 0.95rem;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.25);
  transition: var(--transition);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.45);
}

.back-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.back-btn:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: var(--accent);
}

/* ── FAQ ACCORDION ── */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  color: var(--white);
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  padding: 8px 0;
}

.section-light .faq-question {
  color: var(--text);
}

.faq-question .arrow {
  transition: var(--transition);
  color: var(--accent);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

.section-light .faq-answer {
  color: var(--gray);
}

.faq-item.active .faq-answer {
  max-height: 500px; /* dynamic auto expanding style */
  padding-top: 12px;
}

.faq-item.active .faq-question .arrow {
  transform: rotate(180deg);
}

/* ── FOOTER ── */
footer {
  background: var(--navy);
  border-top: 1px solid var(--border);
  padding: 60px 0 40px;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 30px;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-brand img {
  height: 48px;
  width: auto;
}

.footer-brand .ft-name {
  color: var(--white);
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.1em;
}

.footer-brand .ft-slogan {
  color: var(--accent);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  margin-top: 2px;
  font-weight: 700;
}

.footer-meta {
  font-size: 0.9rem;
  text-align: right;
  line-height: 1.8;
}

.footer-meta a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

.footer-meta a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-copy {
  text-align: center;
  font-size: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
}

@media (max-width: 768px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .footer-brand {
    flex-direction: column;
    gap: 8px;
  }

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

/* Page section display states for tab switching */
.page {
  display: none;
  min-height: 100vh;
}

.page.active {
  display: block;
  animation: pageIn 0.45s ease both;
}

@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}