:root {
  --bg: #f8fafc;
  --bg-alt: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --line: #e5e7eb;
  --primary: #1f7aec;
  --primary-dark: #1553a6;
  --accent: #8fc83c;
  --shadow: 0 15px 45px rgba(15, 23, 42, 0.1);
  --radius: 18px;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --text: #f8fafc;
  --muted: #94a3b8;
  --line: #334155;
  --shadow: 0 15px 45px rgba(0, 0, 0, 0.5);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* Offset for sticky header */
}

/* Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: opacity, transform;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-delay-100 {
  transition-delay: 0.1s;
}

.animate-delay-200 {
  transition-delay: 0.2s;
}

.animate-delay-300 {
  transition-delay: 0.3s;
}


body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
  transition: color 0.3s ease, background-color 0.3s ease;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(248, 250, 252, 0.8);
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 5vw;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .site-header {
  background: rgba(15, 23, 42, 0.85);
  /* Slightly transparent dark background */
  border-bottom-color: rgba(51, 65, 85, 0.7);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

[data-theme="dark"] .site-header.scrolled {
  background: rgba(30, 41, 59, 0.95);
  /* Darker opaque background when scrolled */
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.logo {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.2s ease;
}

.logo:hover {
  opacity: 0.8;
}

.logo-img {
  width: 42px;
  height: auto;
  object-fit: contain;
  /* 去背處理：如果圖片有白色背景，使用 mix-blend-mode */
  mix-blend-mode: multiply;
  transition: filter 0.3s ease;
}

[data-theme="dark"] .logo-img {
  /* 夜間模式：反轉顏色並使用 screen 濾除黑色背景 */
  filter: invert(1) contrast(0.95) saturate(0.5) hue-rotate(180deg);
  mix-blend-mode: screen;
}

.logo-mark {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.1rem;
  letter-spacing: 0.2rem;
  border: 1.5px solid var(--text);
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
}

.logo-text {
  font-size: 1.5rem;
}

.logo-text strong {
  display: block;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.05em;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-weight: 500;
}

.site-nav a {
  /*padding: 0.35rem 0;*/
  position: relative;
}

.site-nav a:not(.cta-link)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.1rem;
  width: 100%;
  height: 2px;
  background: var(--text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

/* Dropdown Menu */
.nav-item-dropdown {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  padding: 1rem 0;
  /* Increase hit area */
}

.dropdown-arrow {
  transition: transform 0.2s ease;
}

.nav-item-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  /* Position below the header */
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--bg-alt);
  min-width: 260px;
  border-radius: 12px;
  padding: 0.8rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--line);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

[data-theme="dark"] .dropdown-menu {
  background: rgba(30, 41, 59, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.nav-item-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* Creating a safe bridge area so mouse doesn't leave hover state */
.nav-item-dropdown::after {
  content: "";
  position: absolute;
  bottom: -20px;
  /* Adjust based on gap */
  left: 0;
  width: 100%;
  height: 20px;
}

.dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 1rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s ease;
}

.dropdown-menu a:hover {
  background: rgba(31, 122, 236, 0.08);
}

.dropdown-menu a::after {
  display: none;
  /* Remove underline animation from submenu */
}

.dropdown-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  transition: color 0.2s ease;
}

.dropdown-menu a:hover .dropdown-icon {
  color: var(--primary);
}

.dropdown-icon svg {
  width: 20px;
  height: 20px;
}

.dropdown-menu strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.1rem;
}

.dropdown-menu span:not(.dropdown-icon) {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
}

/* Fix CTA Link alignment */
.cta-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.7rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(31, 122, 236, 0.25);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Shine effect */
.cta-link::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg,
      transparent,
      rgba(255, 255, 255, 0.2),
      transparent);
  transition: 0.5s;
}

.cta-link:hover {
  /*transform: translateY(-2px);*/
  box-shadow: 0 8px 20px rgba(31, 122, 236, 0.35);
  padding-right: 1.3rem;
  /* Adjust padding to make room for icon movement if needed, or just keep same */
}

.cta-link:hover::before {
  left: 100%;
}

.cta-link svg {
  transition: transform 0.3s ease;
}

.cta-link:hover svg {
  transform: translateX(4px);
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-alt);
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 6px;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
}

main {
  padding: 0;
}

.hero {
  width: 100%;
  height: 60vh;
  min-height: 500px;
  overflow: hidden;
  margin: 0;
  padding: 0;
}

.hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-intro {
  padding: 4rem 5vw;
  margin: 0;
}

.hero-copy {
  max-width: 1200px;
  margin: 0 auto;
}

.hero-copy .eyebrow {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.15rem;
  text-transform: uppercase;
}

.eyebrow {
  font-size: 32px;
}

.hero-intro h1 {
  font-size: clamp(2.5rem, 4vw, 4rem);
  margin: 0.6rem 0 1rem;
  line-height: 1.2;
  color: var(--text);
}

.lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow);
}

.btn.primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn.ghost {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.hero-metrics article {
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
}

.hero-metrics h5 {
  margin: 0;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08rem;
  color: var(--accent);
}

.hero-metrics p {
  color: var(--muted);
}


.trust-section {
  padding: 3rem 5vw;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.trust-label {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.1rem;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
  opacity: 0.8;
}

.trust-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 3rem;
  opacity: 0.6;
}

.partner-logo {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  filter: grayscale(100%);
  transition: all 0.3s ease;
  user-select: none;
}

.partner-logo:hover {
  filter: grayscale(0%);
  opacity: 1;
  color: var(--primary);
  transform: scale(1.05);
}

/* Hide the scroller placeholder for now, using grid */
.scroller {
  display: none;
}

.section {
  margin: 4rem 0;
  padding: 4rem 5vw;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.section-heading h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  margin-bottom: 1rem;
}

.section-heading p {
  color: var(--muted);
}

.solutions {
  border-top: 1px solid var(--line);
}

.about {
  border-top: 1px solid var(--line);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 1000px) {
  .about-grid {
    grid-template-columns: repeat(2, 1fr);
    /* About section usually looks better with 2 main columns */
  }
}

.about-copy .about-list {
  margin: 1rem 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.about-media {
  background: var(--bg-alt);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.about-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.about-note {
  padding: 1.4rem;
  background: #0f172a;
  color: #fff;
}

.about-info {
  margin: 0.4rem 0 0;
  font-weight: 600;
  letter-spacing: 0.08rem;
  color: var(--accent);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
}

@media (min-width: 1000px) {
  .solutions-grid {
    grid-template-columns: repeat(3, 1fr);
    /* 3 cards usually */
  }
}

@media (min-width: 1200px) {
  .solutions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.solution-card {
  padding: 1.75rem;
  border-radius: var(--radius);
  background: var(--bg-alt);
  box-shadow: var(--shadow);
  border: 1px solid #eef2ff;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.solution-card ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.solutions-media {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 2rem;
  align-items: center;
}

.solutions-media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.media-note {
  background: #0f172a;
  color: #fff;
  border-radius: var(--radius);
  padding: 2rem;
}

.media-note .inline-link {
  color: var(--accent);
  font-weight: 600;
}

.products {
  border-top: 1px solid var(--line);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.8rem;
}

@media (min-width: 1000px) {
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
    /* 4 columns as requested */
  }
}

@media (max-width: 600px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    /* 2 columns on mobile as requested */
  }

  .product-card {
    font-size: 0.9em;
  }

  .product-body {
    padding: 1rem;
  }

  .btn {
    padding: 0.7rem 1.2rem;
    /* Compact buttons */
    font-size: 0.9rem;
  }
}

.product-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.15);
}

.product-card img {
  width: 100%;
  height: 220px;
  object-fit: contain;
  padding: 1rem;
  background: #fff;
}

.product-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.product-body ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.product-cta {
  margin-top: 2.5rem;
  padding: 2rem;
  border-radius: var(--radius);
  background: rgba(31, 122, 236, 0.08);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
}

.news {
  border-top: 1px solid var(--line);
}

.news-list {
  display: grid;
  gap: 1.5rem;
}

.news-list article {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: center;
}

.news-date {
  text-align: center;
  font-weight: 600;
  color: var(--muted);
  border-right: 1px solid var(--line);
  padding-right: 1.5rem;
}

.news-date span {
  display: block;
  letter-spacing: 0.1rem;
}

.news-date strong {
  font-size: 1.2rem;
}

.news-list h3 {
  margin: 0 0 0.5rem;
}

.news-list p {
  margin: 0 0 0.6rem;
  color: var(--muted);
}

.news-list a {
  font-weight: 600;
  color: var(--primary);
}

.anchors {
  padding: 0;
}

.anchor-pill {
  background: #fff;
  border-radius: 999px;
  padding: 0.8rem 1.5rem;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: max-content;
  margin: 0 auto;
}

.anchor-pill span {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15rem;
  color: var(--muted);
}

.anchor-pill div {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.anchor-pill a {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid transparent;
}

.anchor-pill a:hover {
  border-color: var(--line);
}

.contact {
  border-top: 1px solid var(--line);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.contact-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.contact-card ul,
.contact-card ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: var(--muted);
}

.site-footer {
  padding: 2.5rem 5vw;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1.2rem;
}

.inline-link {
  color: var(--primary);
  font-weight: 600;
}

@media (max-width: 1024px) {
  .hero {
    height: 50vh;
    min-height: 400px;
  }

  .hero-intro {
    padding: 3rem 3vw;
  }

  .hero-metrics {
    justify-items: center;
  }

  .solutions-media {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    padding: 0.8rem 1.25rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 5vw;
    left: 5vw;
    flex-direction: column;
    flex-direction: column;
    background: var(--bg-alt);
    /* Fix White-on-White in Dark Mode */
    padding: 1.2rem;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    transform: translateY(-20px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .site-nav.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
  }

  /* Fix Mobile Dropdown Overlap */
  .nav-item-dropdown {
    display: block;
    width: 100%;
  }

  .dropdown-trigger {
    width: 100%;
    justify-content: center;
    gap: 6px;
    align-items: center;
    padding: 0.35rem 0;
    /* Fix alignment - match other links */
  }

  .dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0 0 0 1rem;
    min-width: 100%;
    display: none;
    flex-direction: column;
    /* Ensure vertical stacking */
  }

  .nav-item-dropdown:hover .dropdown-menu,
  .nav-item-dropdown:active .dropdown-menu,
  .nav-item-dropdown:focus-within .dropdown-menu {
    display: flex;
    transform: none;
  }

  /* Fix invisible text in mobile dropdown */
  .dropdown-menu strong {
    color: var(--text);
  }

  .dropdown-menu span {
    color: var(--muted);
  }

  .dropdown-menu a {
    padding: 0.6rem 0;
  }

  main {
    padding: 0;
  }

  .section {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .hero {
    height: 40vh;
    min-height: 300px;
  }

  .hero-intro {
    padding: 2rem 1.25rem;
  }

  .news-list article {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .news-date {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 1rem;
    margin-bottom: 0.8rem;
  }
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(31, 122, 236, 0.25);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 99;
}

.back-to-top::before {
  content: "回到頂端";
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%) translateX(10px);
  background: var(--text);
  color: var(--bg);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-to-top::after {
  content: "";
  position: absolute;
  right: calc(100% + 4px);
  top: 50%;
  transform: translateY(-50%) translateX(10px);
  border-width: 4px;
  border-style: solid;
  border-color: transparent transparent transparent var(--text);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(31, 122, 236, 0.4);
}

.back-to-top:hover::before,
.back-to-top:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

.back-to-top:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(31, 122, 236, 0.25);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.back-to-top:hover svg {
  transform: translateY(-2px);
}

@media (max-width: 540px) {
  .hero {
    padding: 3rem 0;
  }

  .product-card img {
    height: 180px;
  }

  .anchor-pill {
    flex-direction: column;
    text-align: center;
  }

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

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
  }
}

/* Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease;
}

.theme-toggle:hover {
  background: rgba(15, 23, 42, 0.1);
}

[data-theme="dark"] .theme-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Search Box */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-overlay {
  position: fixed;
  top: 68px;
  /* Below header */
  left: 0;
  width: 100%;
  height: auto;
  z-index: 90;
  /* Below header z-index */
  display: flex;
  justify-content: center;
  align-items: flex-start;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  /* Remove blur and background to avoid "pressure" */
  background: transparent;
}

.search-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* Clickable backdrop area for closing */
.search-overlay::before {
  content: "";
  position: fixed;
  top: 68px;
  left: 0;
  width: 100%;
  height: 100vh;
  background: transparent;
  /* Invisible backdrop */
  display: none;
}

.search-overlay.open::before {
  display: block;
}

.search-container {
  background: var(--bg-alt);
  padding: 1rem 5vw;
  width: 100%;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transform: translateY(-100%);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.search-overlay.open .search-container {
  transform: translateY(0);
}

.search-input {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  display: block;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  /* Squared off a bit for cleaner look */
  font-size: 1.1rem;
  outline: none;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s ease;
}

.search-input:focus {
  border-color: var(--primary);
}

.search-results {
  margin-top: 1.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.search-result-item {
  padding: 1rem;
  border-bottom: 1px solid var(--line);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item a {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.search-result-item p {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
}

/* Mobile Bottom Nav */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  z-index: 1000;
  padding: 0.8rem 1rem;
  gap: 1rem;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .mobile-bottom-nav {
  background: rgba(15, 23, 42, 0.9);
}

.mobile-nav-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease;
}

.mobile-nav-item:active {
  transform: scale(0.96);
}

.mobile-nav-item.secondary {
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
}

.mobile-nav-item.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(31, 122, 236, 0.25);
}

@media (max-width: 768px) {
  .mobile-bottom-nav {
    display: flex;
  }

  body {
    padding-bottom: 70px;
    /* Prevent content from being hidden */
  }

  /* Adjust back-to-top position to not overlap */
  .back-to-top {
    bottom: 5.5rem;
  }
}