/* Yiroute — blue & white */
:root {
  --blue: #1565c0;
  --blue-dark: #0d47a1;
  --blue-light: #e3f2fd;
  --blue-muted: #5c8fd6;
  --bg: #ffffff;
  --bg-page: #f5f9ff;
  --surface: #ffffff;
  --text: #0d2137;
  --muted: #5a6b7d;
  --border: #bbdefb;
  --radius: 12px;
  --font: "DM Sans", system-ui, -apple-system, sans-serif;
  --max: 60rem;
  --shadow-sm: 0 1px 4px rgba(13, 71, 161, 0.08);
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font);
  background: var(--bg-page);
  color: var(--text);
  line-height: 1.65;
  font-size: 1.0625rem;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  color: var(--blue-dark);
}

header {
  padding: 1.1rem 1.5rem;
  background: var(--blue);
  border-bottom: 3px solid var(--blue-dark);
  margin-bottom: 2rem;
}

header .inner {
  max-width: calc(var(--max) + 3rem);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: #ffffff;
  text-decoration: none;
}

.logo:hover {
  color: #ffffff;
}

.logo-suffix {
  color: #ffffff;
}

.logo-prefix {
  display: inline-block;
  position: relative;
  min-width: 1.05em;
  text-align: center;
  vertical-align: baseline;
}

.logo-prefix-en,
.logo-prefix-zh {
  transition: opacity 0.18s ease;
}

.logo-prefix-zh {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  opacity: 0;
  color: var(--blue-light);
}

.logo:hover .logo-prefix-en {
  opacity: 0;
}

.logo:hover .logo-prefix-zh {
  opacity: 1;
}

header nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.9375rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

header nav a:not(.nav-app-store-link) {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 500;
}

header nav a:not(.nav-app-store-link):hover {
  color: #ffffff;
  text-decoration: underline;
}

.nav-app-store-link {
  display: inline-flex;
  align-items: center;
  line-height: 0;
  flex-shrink: 0;
  border-radius: 6px;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.nav-app-store-link:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.nav-app-store-badge {
  display: block;
  height: 32px;
  width: auto;
}

main {
  max-width: calc(var(--max) + 3rem);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.hero {
  text-align: center;
  padding: 1.5rem 0 2rem;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.875rem, 5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--blue-dark);
}

.hero p,
.hero-lede {
  margin: 0 auto;
  color: var(--muted);
  max-width: 30rem;
  font-size: 1.0625rem;
}

/* App description (home) */
.app-about {
  margin: 0 0 2.5rem;
}

.app-about-card {
  padding: 1.75rem 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.app-about-intro {
  margin: 0 0 1.75rem;
  font-size: 1.0625rem;
  color: var(--text);
  line-height: 1.7;
}

.app-about-card h2 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue-dark);
}

.app-features {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.25rem;
}

.app-features li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.app-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}

.app-features strong {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
}

/* App screenshots carousel (home) */
.app-screenshots {
  margin: 2rem 0 2.5rem;
}

.app-screenshots h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue-dark);
  text-align: center;
}

.app-screenshots-lede {
  margin: 0 auto 1.5rem;
  max-width: 28rem;
  text-align: center;
  font-size: 0.9375rem;
  color: var(--muted);
}

.app-screenshots-carousel {
  position: relative;
  margin: 0 -1.5rem;
  padding: 0 0.5rem;
  --slide-width: min(300px, 82vw);
}

.app-screenshots-viewport {
  overflow: hidden;
  cursor: pointer;
  outline: none;
}

.app-screenshots-viewport:focus-visible {
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.35);
  border-radius: 1.25rem;
}

.app-screenshots-track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 1.25rem calc(50% - var(--slide-width) / 2);
}

.app-screenshots-track::-webkit-scrollbar {
  display: none;
}

.app-screenshot {
  flex: 0 0 var(--slide-width);
  margin: 0;
  scroll-snap-align: center;
  transition: transform 0.35s ease, opacity 0.35s ease;
  transform: scale(0.82);
  opacity: 0.4;
}

.app-screenshot.is-active {
  transform: scale(1);
  opacity: 1;
}

.app-screenshot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1.35rem;
  border: 1px solid var(--border);
  box-shadow: 0 12px 32px rgba(13, 71, 161, 0.16);
  background: var(--surface);
  pointer-events: none;
  user-select: none;
}

.app-screenshots-nav {
  position: absolute;
  top: 50%;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: var(--blue-dark);
  box-shadow: 0 2px 12px rgba(13, 71, 161, 0.18);
  cursor: pointer;
  transform: translateY(-50%);
  transition: background 0.15s ease, opacity 0.15s ease, transform 0.15s ease;
}

.app-screenshots-nav:hover:not(:disabled) {
  background: #ffffff;
  transform: translateY(-50%) scale(1.05);
}

.app-screenshots-nav:disabled {
  opacity: 0.35;
  cursor: default;
}

.app-screenshots-nav--prev {
  left: max(0.25rem, calc(50% - var(--slide-width) / 2 - 3rem));
}

.app-screenshots-nav--next {
  right: max(0.25rem, calc(50% - var(--slide-width) / 2 - 3rem));
}

.app-screenshots-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.app-screenshots-dots button {
  width: 0.5rem;
  height: 0.5rem;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: var(--border);
  cursor: pointer;
  transition: width 0.25s ease, background 0.25s ease;
}

.app-screenshots-dots button[aria-selected="true"] {
  width: 1.25rem;
  background: var(--blue);
}

.app-screenshots-dots button:hover {
  background: var(--blue-muted);
}

.app-screenshots-captions {
  position: relative;
  margin: 1.25rem auto 0;
  max-width: 36rem;
  min-height: 5.5rem;
}

.app-screenshot-caption {
  display: none;
  text-align: center;
}

.app-screenshot-caption.is-active {
  display: block;
}

.app-screenshot-caption h3 {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--blue-dark);
}

.app-screenshot-caption p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--muted);
}

@media (min-width: 640px) {
  .app-screenshots-carousel {
    margin: 0;
    padding: 0 3rem;
    --slide-width: min(360px, 42vw);
  }

  .app-screenshots-nav--prev {
    left: 0;
  }

  .app-screenshots-nav--next {
    right: 0;
  }
}

@media (min-width: 900px) {
  .app-screenshots-carousel {
    --slide-width: min(400px, 34vw);
  }
}

/* Footer */
footer {
  margin-top: 2.5rem;
  padding: 2rem 1.5rem 2.25rem;
  border-top: 3px solid var(--blue-dark);
  text-align: center;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.9);
  background: var(--blue);
}

.footer-inner {
  max-width: calc(var(--max) + 3rem);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-download {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  padding: 0.875rem 1.25rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
}

.footer-download-separator {
  width: 1px;
  height: 2.5rem;
  background: rgba(255, 255, 255, 0.35);
  flex-shrink: 0;
}

.footer-qr img {
  display: block;
  width: 72px;
  height: 72px;
  padding: 0.25rem;
  background: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 8px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.625rem 0.75rem;
  width: 100%;
  max-width: 40rem;
  font-size: 0.9375rem;
  font-weight: 600;
}

.footer-nav a {
  color: #ffffff;
  text-decoration: none;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.footer-nav a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.24);
  border-color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
}

.footer-company {
  text-align: center;
  max-width: 40rem;
}

.footer-company-name {
  margin: 0 0 0.35rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: #ffffff;
}

.footer-company-name-zh {
  margin: 0 0 0.625rem;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.88);
}

.footer-company-tagline {
  margin: 0 0 0.875rem;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.88);
}

.footer-copy {
  margin: 0;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.78);
}

footer .app-store-link {
  display: inline-block;
  line-height: 0;
  border-radius: 6px;
  transition: opacity 0.15s ease;
}

footer .app-store-link:hover {
  opacity: 0.85;
}

footer .app-store-badge {
  display: block;
  height: 40px;
  width: auto;
}

@media (max-width: 519px) {
  .footer-download-separator {
    display: none;
  }
}

.legal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  box-shadow: var(--shadow-sm);
}

.legal h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 4vw, 1.875rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--blue-dark);
}

.updated {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 2rem;
}

.legal h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--blue);
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--blue-light);
}

.legal p,
.legal li {
  margin: 0 0 0.85rem;
  color: var(--text);
}

.legal ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

.legal li::marker {
  color: var(--blue);
}

.back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Support / About */
.support-page.legal {
  padding: 1.5rem 1.5rem;
}

.support-page .support-lede {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.support-page h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: var(--blue-dark);
}

.support-page h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

.support-contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
  margin: 0 0 0.5rem;
  font-size: 0.9375rem;
}

.support-contact-line strong {
  font-weight: 600;
  color: var(--text);
}

.support-contact-line a {
  word-break: break-all;
}

.support-muted {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.support-note {
  margin-top: 1.25rem;
}

.support-list {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
}

.support-list li {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.55;
}

.support-list li + li {
  margin-top: 0.25rem;
}

.support-page .back {
  margin-bottom: 1rem;
}

.support-page h1 {
  margin-bottom: 0.75rem;
}

/* Blogs index */
main.blogs-index {
  max-width: calc(var(--max) + 3rem);
}

.blogs-page-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.125rem);
  font-weight: 700;
  color: var(--blue-dark);
}

.blogs-intro {
  color: var(--muted);
  margin: 0 0 2rem;
}

.blogs-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .blogs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .blogs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.blog-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  color: inherit;
  box-shadow: var(--shadow-sm);
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.15s ease;
}

.blog-card:hover {
  border-color: var(--blue);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  color: inherit;
}

.blog-card-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--blue-light);
}

.blog-card-body {
  padding: 1.1rem 1.25rem 1.25rem;
  flex: 1;
}

.blog-card-meta {
  margin: 0 0 0.45rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

.blog-card-title {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--blue-dark);
}

.blog-card-summary {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Blog article */
.blog-post .blog-hero {
  display: block;
  width: 100%;
  max-height: 16rem;
  object-fit: cover;
  border-radius: var(--radius);
  margin: 0 0 1rem;
  border: 1px solid var(--border);
}

.blog-post .blog-meta {
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.blog-post h1:first-of-type {
  margin-top: 0;
}

.legal h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.legal blockquote {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--blue);
  background: var(--blue-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
}

.legal blockquote p {
  margin: 0;
}

.legal hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

.md-table-wrap {
  overflow-x: auto;
  margin: 0 0 1rem;
}

.md-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.md-table th,
.md-table td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

.md-table th {
  background: var(--blue-light);
  color: var(--blue-dark);
  font-weight: 600;
}

@media (max-width: 519px) {
  .legal {
    padding: 1.5rem 1.25rem;
  }

  nav {
    gap: 0.75rem;
    font-size: 0.875rem;
  }
}