:root {
  --blue: #0066cc;
  --ink: #1d1d1f;
  --muted: #f2f2f2;
  --canvas: #ffffff;
  --parchment: #33304b;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: "JinKai", "TsangerJinKai02", "TsangerJinKai", "苍耳今楷", "CangEr JinKai", "霞鹜文楷", "LXGW WenKai", serif;
  font-size: 21px;
  line-height: 1.55;
  letter-spacing: 0;
}

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

.hero {
  position: relative;
  min-height: 86vh;
  overflow: hidden;
  color: white;
  background:
    radial-gradient(circle at 76% 18%, rgba(41, 151, 255, 0.18) 0 120px, transparent 122px),
    linear-gradient(180deg, #f8fbff 0%, #eaf4ff 100%);
}

.github-link {
  position: absolute;
  top: 42px;
  right: clamp(24px, 5vw, 88px);
  z-index: 2;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--ink);
  transition: transform 180ms ease;
}

.github-link:hover {
  transform: scale(1.04);
}

.github-link svg {
  width: 30px;
  height: 30px;
  fill: currentColor;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(360px, 0.78fr) minmax(560px, 1.22fr);
  align-items: center;
  gap: clamp(42px, 5vw, 86px);
  width: min(100%, 1840px);
  min-height: calc(86vh - 48px);
  margin: 0 auto;
  padding: 76px clamp(32px, 5vw, 72px) 112px;
}

.hero-copy {
  max-width: 720px;
  color: var(--ink);
}

.logo-mark {
  width: 166px;
  height: 166px;
  margin-bottom: 22px;
  display: grid;
  place-items: center;
}

.logo-mark img {
  width: 138px;
  height: 138px;
  object-fit: contain;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-family: Georgia, "Times New Roman", "Noto Serif", "Source Han Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(56px, 4.8vw, 88px);
  font-weight: 350;
  line-height: 0.96;
  white-space: nowrap;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 20px;
}

.tag-list span {
  min-width: 92px;
  padding: 4px 18px 6px;
  border: 1px solid rgba(0, 102, 204, 0.45);
  border-radius: 10px;
  color: var(--blue);
  background: rgba(255, 255, 255, 0.45);
  text-align: center;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
}

.tagline {
  width: max-content;
  max-width: 100%;
  margin-bottom: 48px;
  color: var(--ink);
  font-size: clamp(22px, 1.9vw, 30px);
  line-height: 1.25;
  white-space: nowrap;
}

.button-row {
  display: flex;
  align-items: center;
  gap: 40px;
}

.download-button {
  gap: 10px;
}

.download-button svg {
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
  fill: currentColor;
}

.button-label {
  display: grid;
  gap: 2px;
  line-height: 1.05;
}

.button-label small {
  font-size: 0.68em;
  font-weight: 400;
  opacity: 0.78;
}

.primary-button,
.store-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 72px;
  border-radius: 14px;
  transition: transform 180ms ease, background-color 180ms ease;
}

.primary-button {
  min-width: 174px;
  padding: 0 30px;
  color: white;
  background: var(--blue);
  font-size: 21px;
  font-weight: 700;
}

.store-button {
  min-width: 174px;
  padding: 0 28px;
  color: var(--blue);
  background: white;
  border: 1px solid rgba(0, 102, 204, 0.2);
  font-size: 21px;
  font-weight: 700;
}

.primary-button:hover,
.store-button:hover {
  transform: scale(1.04);
}

.primary-button:hover {
  background: #0071e3;
}

.hero-media {
  align-self: center;
}

.image-zoom-trigger {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
  font: inherit;
}

.image-zoom-trigger:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 8px;
  border-radius: 10px;
}

.hero-screenshot {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 18px 34px rgba(0, 102, 204, 0.14));
}

.wave {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 178px;
  pointer-events: none;
}

.wave svg {
  display: block;
  width: 100%;
  height: 100%;
}

.wave-back,
.wave-mid,
.wave-front {
  fill: var(--canvas);
}

.wave-back {
  opacity: 0.14;
}

.wave-mid {
  opacity: 0.22;
}

.wave-front {
  opacity: 1;
}

.features {
  padding: 26px clamp(24px, 8vw, 150px) 92px;
  background: var(--canvas);
}

.section-title {
  display: grid;
  justify-items: center;
  margin-bottom: 78px;
}

.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 1fr);
  align-items: center;
  gap: clamp(32px, 5vw, 80px);
  width: min(100%, 1640px);
  margin: 0 auto 112px;
}

.feature-row.reverse {
  grid-template-columns: minmax(650px, 1.26fr) minmax(320px, 0.74fr);
  gap: clamp(20px, 3vw, 48px);
  width: min(100%, 1880px);
}

.feature-row.reverse .feature-copy {
  order: 2;
}

.feature-row.reverse .feature-art {
  order: 1;
}

.feature-copy h3 {
  margin-bottom: 32px;
  font-size: clamp(40px, 3.8vw, 56px);
  font-weight: 400;
  line-height: 1;
}

.feature-copy ol {
  margin: 0;
  padding-left: 36px;
  color: var(--ink);
  font-size: clamp(24px, 2vw, 32px);
  line-height: 1.45;
}

.feature-art {
  display: grid;
  place-items: center;
  min-height: 360px;
}

.feature-art img {
  display: block;
  width: min(100%, 760px);
  height: auto;
  object-fit: contain;
}

.feature-art-wide img {
  width: min(100%, 1240px);
}

.feature-caption {
  margin: 12px 0 0;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.35;
  opacity: 0.62;
  text-align: center;
}

.image-dialog {
  width: min(94vw, 1280px);
  max-width: none;
  max-height: 92vh;
  padding: 0;
  border: 0;
  background: transparent;
}

.image-dialog::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

.image-dialog img {
  display: block;
  max-width: 100%;
  max-height: 88vh;
  margin: 0 auto;
  object-fit: contain;
  touch-action: none;
  transform-origin: center center;
  user-select: none;
  -webkit-user-drag: none;
}

.image-dialog-close {
  position: fixed;
  top: 18px;
  right: 22px;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: white;
  background: rgba(0, 0, 0, 0.42);
  cursor: pointer;
  font: 32px/1 Arial, sans-serif;
}

.site-footer {
  display: grid;
  gap: 6px;
  padding: 28px 20px 34px;
  color: var(--muted);
  background: var(--parchment);
  text-align: center;
  font-size: 18px;
  line-height: 1.45;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 110px;
  }

  .hero-copy {
    width: 100%;
    max-width: none;
    min-width: 0;
  }

  .hero-media {
    width: min(100%, 860px);
    min-width: 0;
  }

  .feature-row,
  .feature-row.reverse {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .feature-row.reverse .feature-copy,
  .feature-row.reverse .feature-art {
    order: initial;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 18px;
  }

  .github-link {
    top: 22px;
    right: 18px;
    width: 32px;
    height: 32px;
  }

  .hero-grid {
    min-height: 84vh;
    gap: 28px;
    padding: 76px 20px 82px;
    text-align: center;
  }

  .logo-mark {
    width: 104px;
    height: 104px;
    margin: 0 auto 12px;
  }

  .logo-mark img {
    width: 92px;
    height: 92px;
  }

  h1 {
    width: 100%;
    margin-bottom: 16px;
    font-size: clamp(40px, 12.4vw, 52px);
    text-align: center;
  }

  .tag-list {
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
  }

  .tag-list span {
    min-width: auto;
    padding: 3px 12px 5px;
    font-size: 16px;
  }

  .tagline {
    width: auto;
    margin-bottom: 26px;
    font-size: clamp(18px, 5.2vw, 22px);
    line-height: 1.24;
    white-space: nowrap;
  }

  .button-row {
    justify-content: center;
    gap: 12px;
  }

  .primary-button,
  .store-button {
    width: auto;
    min-width: 148px;
    min-height: 58px;
    padding: 0 18px;
    font-size: 18px;
  }

  .download-button {
    gap: 8px;
  }

  .download-button svg {
    width: 19px;
    height: 19px;
  }

  .hero-media {
    width: 100%;
  }

  .wave {
    height: 104px;
  }

  .features {
    padding: 18px 22px 72px;
  }

  .section-title {
    margin-bottom: 54px;
  }

  .feature-row {
    gap: 28px;
    margin-bottom: 72px;
  }

  .feature-copy h3 {
    margin-bottom: 20px;
    font-size: 34px;
  }

  .feature-copy ol {
    padding-left: 28px;
    font-size: 22px;
    line-height: 1.45;
  }

  .feature-art {
    min-height: 260px;
  }

  .feature-art img {
    width: min(100%, 390px);
  }

  .feature-art-wide img {
    width: min(100%, 430px);
  }
}

@media (max-width: 380px) {
  .github-link {
    right: 14px;
  }

  .hero-grid {
    padding-inline: 16px;
  }

  .tag-list span {
    font-size: 17px;
    padding-inline: 10px;
  }

  .primary-button,
  .store-button {
    min-width: 0;
    width: 100%;
    padding-inline: 14px;
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
    width: 100%;
  }
}