:root {
  color-scheme: dark;
  --color-surface: #121212;
  --color-sidebar: #1c1c1e;
  --color-toolbar: #1c1c1e;
  --color-border: #2c2c2e;
  --color-border-light: #38383a;
  --color-hover: #2c2c2e;
  --color-active: #3a3a3c;
  --color-text: #d1d1d6;
  --color-text-dim: #8e8e93;
  --color-text-dimmer: #48484a;
  --color-accent: #007aff;
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.24);
  --radius-large: 18px;
  --radius-medium: 12px;
  --radius-small: 8px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--color-text);
  background:
    radial-gradient(
      circle at top center,
      rgba(0, 122, 255, 0.12),
      transparent 26%
    ),
    linear-gradient(180deg, #101012 0%, var(--color-surface) 100%);
  font-family:
    -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans", "Noto Sans CJK JP", "Noto Sans CJK SC",
    "Microsoft YaHei", sans-serif;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0 3rem;
}

.site-header,
.site-footer,
.hero-shell,
.info-section,
.cta-panel,
.install-card {
  border: 1px solid var(--color-border);
  background: var(--color-sidebar);
}

.site-header,
.site-footer,
.cta-panel {
  border-radius: var(--radius-large);
}

.hero-shell,
.info-section {
  border-radius: calc(var(--radius-large) + 2px);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.2rem;
  position: sticky;
  top: 1rem;
  z-index: 10;
  margin-bottom: 1.25rem;
  background: rgba(28, 28, 30, 0.88);
  backdrop-filter: blur(16px);
}

.wordmark {
  color: #ebebf5;
  text-decoration: none;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.site-nav,
.footer-links,
.cta-links,
.hero-actions {
  display: flex;
  flex-wrap: wrap;
}

.site-nav,
.footer-links,
.cta-links {
  gap: 0.85rem 1rem;
}

.site-nav a,
.footer-links a,
.cta-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-nav a:hover,
.footer-links a:hover,
.cta-links a:hover {
  color: #ebebf5;
}

.landing-main {
  display: grid;
  gap: 1.25rem;
}

.hero-shell,
.info-section {
  padding: clamp(1.4rem, 2.6vw, 2rem);
  box-shadow: var(--shadow-soft);
}

.hero-shell {
  min-height: calc(100svh - 7.5rem);
}

.hero-inner {
  display: grid;
  place-items: center;
  gap: 1.5rem;
  min-height: 100%;
  text-align: center;
}

.app-icon {
  display: block;
  width: clamp(6.5rem, 18vw, 10rem);
  height: auto;
}

.hero-copy {
  display: grid;
  gap: 1rem;
  justify-items: center;
  max-width: 38rem;
}

.eyebrow,
.feature-label {
  margin: 0;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  font-weight: 600;
}

h1,
h2,
h3 {
  margin: 0;
  color: #ebebf5;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 {
  max-width: 11ch;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 0.95;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1;
}

h3 {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.15;
}

.lede,
.section-copy,
.hero-note,
.detail-row p,
.feature-row p,
.install-card p,
.doc-body p,
.site-footer p {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.65;
}

.lede {
  max-width: 34rem;
  font-size: 1.02rem;
}

.narrow {
  max-width: 42rem;
}

.hero-actions {
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.7rem 1.15rem;
  border-radius: var(--radius-medium);
  border: 1px solid var(--color-border-light);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}

.button-primary {
  background: var(--color-accent);
  border-color: transparent;
  color: white;
}

.button-secondary {
  background: var(--color-surface);
  color: var(--color-text);
}

.button:hover {
  filter: brightness(1.05);
}

.hero-note {
  font-size: 0.9rem;
}

.section-heading {
  display: grid;
  gap: 0.7rem;
}

.split-heading {
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 24rem);
  align-items: end;
  gap: 1rem 2rem;
}

.detail-list,
.feature-stack {
  display: grid;
  margin-top: 1.4rem;
}

.detail-row,
.feature-row {
  display: grid;
  gap: 0.55rem 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border);
}

.detail-row:first-child,
.feature-row:first-child {
  padding-top: 0;
  border-top: 0;
}

.feature-row {
  grid-template-columns: minmax(8rem, 10rem) minmax(0, 1fr);
}

.feature-row .feature-label {
  padding-top: 0.2rem;
}

.install-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 1rem;
  margin-top: 1.4rem;
  align-items: start;
}

.install-card {
  display: grid;
  gap: 0.9rem;
  padding: 1.2rem;
  border-radius: var(--radius-medium);
}

.install-card-strong {
  border-color: var(--color-border-light);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.platform-grid li {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 0.95rem;
  border-radius: var(--radius-medium);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.platform-grid span {
  color: var(--color-text-dim);
  font-size: 0.9rem;
}

.platform-grid strong {
  color: #ebebf5;
  font-size: 1rem;
  font-weight: 600;
}

pre {
  position: relative;
  overflow-x: auto;
  margin: 0;
  padding: 1rem;
  border-radius: var(--radius-medium);
  border: 1px solid var(--color-border);
  background: #111214;
  color: var(--color-text);
}

.copy-button {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.35rem 0.6rem;
  background: rgba(28, 28, 30, 0.9);
  border: 1px solid var(--color-border);
  color: var(--color-text-dim);
  border-radius: var(--radius-small);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.copy-button:hover {
  color: #ebebf5;
  border-color: var(--color-border-light);
  background: var(--color-hover);
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem;
}

.content-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.content-list li {
  color: var(--color-text-dim);
}

.content-list li + li {
  margin-top: 0.35rem;
}

.content-list li::before {
  content: "- ";
  color: var(--color-accent);
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding: 1rem 1.2rem;
}

.site-footer {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  padding: 1.2rem;
  margin-top: 1.25rem;
}

.footer-top,
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  flex-wrap: wrap;
}

.footer-bottom {
  padding-top: 1.2rem;
  border-top: 1px solid var(--color-border);
}

/* ─── Demo video ─────────────────────────────────────────────── */

.demo-section {
  display: grid;
  gap: 1.4rem;
}

.video-wrapper {
  border-radius: var(--radius-medium);
  overflow: hidden;
  line-height: 0;
}

.video-thumbnail-link {
  position: relative;
  display: block;
  text-decoration: none;
}

.video-thumbnail {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-medium);
  transition: filter 0.25s ease-out;
}

.video-thumbnail-link:hover .video-thumbnail {
  filter: brightness(0.72);
}

.video-play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  pointer-events: none;
}

.video-play-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 24px rgba(0, 122, 255, 0.45);
  transition:
    transform 0.2s ease-out,
    box-shadow 0.2s ease-out;
}

.video-thumbnail-link:hover .video-play-btn {
  transform: scale(1.08);
  box-shadow: 0 6px 32px rgba(0, 122, 255, 0.6);
}

.video-play-btn svg {
  width: 1.6rem;
  height: 1.6rem;
  margin-left: 0.15rem; /* optical centering for the play triangle */
}

.video-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(235, 235, 245, 0.85);
  letter-spacing: 0.02em;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}

/* ─── App screenshot ─────────────────────────────────────────── */

.app-preview-section {
  display: grid;
  gap: 1.4rem;
}

.app-screenshot-wrapper {
  /* Subtle tinted background that lets the transparent PNG breathe */
  background: radial-gradient(
    ellipse at 50% 40%,
    rgba(0, 122, 255, 0.07),
    transparent 70%
  );
  border-radius: var(--radius-medium);
  padding: clamp(0.75rem, 2vw, 1.5rem);
  line-height: 0;
}

.app-screenshot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-small);
}

/* ─── Import GIF ─────────────────────────────────────────────── */

.import-section {
  display: grid;
  gap: 1.4rem;
}

.import-gif-wrapper {
  border-radius: var(--radius-medium);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  line-height: 0;
  box-shadow: var(--shadow-soft);
}

.import-gif {
  display: block;
  width: 100%;
  height: auto;
}

/* ─── FAQ page ───────────────────────────────────────────────── */

.faq-main {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.faq-header {
  display: grid;
  gap: 0.8rem;
  padding: clamp(2rem, 5vw, 3rem) 0 0;
}

.faq-title {
  font-size: clamp(2.8rem, 6vw, 5rem);
  letter-spacing: -0.03em;
  line-height: 0.93;
  max-width: 10ch;
}

.faq-intro {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 1rem;
  line-height: 1.6;
}

.faq-body {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
}

.faq-group {
  display: grid;
  gap: 0;
}

.faq-group-label {
  margin: 0 0 0.9rem;
  color: var(--color-text-dimmer);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

/* Individual accordion item */

.faq-item {
  border-top: 1px solid var(--color-border);
  list-style: none; /* remove default triangle in Safari */
}

.faq-item:last-of-type {
  border-bottom: 1px solid var(--color-border);
}

.faq-item summary::-webkit-details-marker {
  display: none; /* hide native arrow in Chrome/Safari */
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  font-weight: 600;
  color: #ebebf5;
  letter-spacing: -0.01em;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  list-style: none;
}

.faq-question:hover {
  color: #fff;
}

.faq-chevron {
  flex-shrink: 0;
  width: 1.1rem;
  height: 1.1rem;
  color: var(--color-text-dim);
  transition: transform 0.24s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-accent);
}

/* Smooth open/close using grid-template-rows trick */

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.faq-item[open] .faq-answer {
  grid-template-rows: 1fr;
}

.faq-answer > * {
  overflow: hidden;
}

.faq-answer p {
  margin: 0 0 1rem;
  color: var(--color-text-dim);
  line-height: 1.7;
  font-size: 0.97rem;
}

.faq-answer p:last-child,
.faq-answer > pre:last-child {
  margin-bottom: 1.2rem;
}

.faq-answer pre {
  margin: 0 0 1rem;
  border-radius: var(--radius-small);
}

/* "More links" footer block */

.faq-more {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  display: grid;
  gap: 0.9rem;
}

.faq-more-label {
  margin: 0;
  color: var(--color-text-dimmer);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.faq-more-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
}

.faq-link {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.92rem;
}

.faq-link:hover {
  color: #ebebf5;
}

/* ─── Media queries ──────────────────────────────────────────── */

@media (max-width: 900px) {
  .split-heading,
  .feature-row,
  .install-layout,
  .platform-grid {
    grid-template-columns: 1fr;
  }

  .site-header,
  .footer-top,
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}