/* Quiet Editor landing — Sage & Vellum design tokens (aligned with app) */
:root {
  --color-surface: #f9f9f7;
  --color-surface-container: #ecefec;
  --color-surface-container-low: #f2f4f2;
  --color-surface-container-lowest: #ffffff;
  --color-surface-container-high: #e5e9e6;
  --color-background: #f9f9f7;
  --color-on-background: #2d3432;
  --color-on-surface: #2d3432;
  --color-on-surface-variant: #5a605e;
  --color-primary: #516351;
  --color-primary-dim: #465745;
  --color-primary-container: #d4e8d1;
  --color-on-primary: #e9fde6;
  --color-outline: rgba(118, 124, 121, 0.35);
  --page-bg: #f2f4f1;
  --page-bg-soft: #eef1ee;
  --page-tint: rgba(208, 226, 204, 0.22);
  --shadow-ambient: 0 8px 28px -6px rgba(45, 52, 50, 0.05);
  --shadow-floating: 0 16px 40px -12px rgba(45, 52, 50, 0.08);
  --shadow-btn: 0 1px 2px rgba(45, 52, 50, 0.05);
  --shadow-card: 0 0 0 1px rgba(132, 144, 137, 0.08), 0 10px 36px -12px rgba(45, 52, 50, 0.07);
  --shadow-card-hover: 0 0 0 1px rgba(81, 99, 81, 0.12), 0 14px 40px -10px rgba(45, 52, 50, 0.09);
  --shadow-nav: 0 1px 0 rgba(255, 255, 255, 0.55), 0 8px 28px -6px rgba(45, 52, 50, 0.05);
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --font-headline: 'Manrope', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --leading-relaxed: 1.65;
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --radius-2xl: 22px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--leading-relaxed);
  color: var(--color-on-surface);
  font-feature-settings: 'kern' 1, 'liga' 1;
  background-color: var(--page-bg);
  background-image: radial-gradient(ellipse 140% 85% at 50% -25%, var(--page-tint), transparent 52%),
    linear-gradient(180deg, #f7f8f6 0%, var(--page-bg) 38%, var(--page-bg-soft) 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease;
}

::selection {
  background: rgba(81, 99, 81, 0.22);
  color: var(--color-on-background);
}

.page-shell {
  position: relative;
  min-height: 100vh;
}

.page-shell::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  background-image: radial-gradient(rgba(45, 52, 50, 0.035) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 35%, black 20%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 35%, black 20%, transparent 72%);
}

.page-shell > * {
  position: relative;
  z-index: 1;
}

/* 首屏装饰允许轻微溢出时，避免整页出现横向滚动条 */
.page-main {
  overflow-x: clip;
}

body.is-scrolled .site-nav {
  box-shadow: var(--shadow-nav);
  background: rgba(252, 252, 250, 0.88);
  border-bottom-color: rgba(118, 124, 121, 0.22);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}
a:hover {
  text-decoration: underline;
  color: var(--color-primary-dim);
}

.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 1.25rem;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* ---- Top nav ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(252, 252, 250, 0.72);
  backdrop-filter: blur(20px) saturate(1.35);
  -webkit-backdrop-filter: blur(20px) saturate(1.35);
  border-bottom: 1px solid rgba(118, 124, 121, 0.22);
  transition: box-shadow 0.45s var(--ease-smooth), background 0.45s ease, border-color 0.35s ease;
}

.site-nav__inner {
  margin: 0 auto;
  padding: var(--space-4) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-nav__brand {
  display: flex;
  align-items: center;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.03em;
  color: var(--color-on-surface);
  text-decoration: none;
}
.site-nav__brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.site-nav__links a {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  padding: 0.25rem 0;
}
.site-nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-smooth);
  opacity: 0.85;
}
.site-nav__links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}
.site-nav__links a:hover::after {
  transform: scaleX(1);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.68rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s var(--ease-smooth), box-shadow 0.3s var(--ease-smooth), background 0.25s ease, border-color 0.25s ease;
}
.btn:hover {
  text-decoration: none;
}
.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: 1px solid rgba(45, 52, 50, 0.08);
  box-shadow: var(--shadow-btn);
}
.btn--primary:hover {
  background: var(--color-primary-dim);
  /* 覆盖全局 a:hover 的 color，否则字色与底色同为 primary-dim，文字会「消失」 */
  color: var(--color-on-primary);
  border-color: rgba(45, 52, 50, 0.1);
  box-shadow: 0 2px 8px rgba(45, 52, 50, 0.08);
  transform: none;
}
.btn--primary:active {
  transform: scale(0.98);
}

.btn--ios-state.btn--primary {
  background: var(--color-surface-container-high);
  background-image: none;
  color: var(--color-on-surface-variant);
  border: 1px solid var(--color-outline);
  box-shadow: none;
}
.btn--ios-state.btn--primary:hover {
  background: var(--color-surface-container);
  background-image: none;
  color: var(--color-on-surface);
  box-shadow: var(--shadow-btn);
  transform: none;
}
.btn--ghost {
  background: rgba(255, 255, 255, 0.72);
  color: var(--color-primary);
  border: 1px solid rgba(118, 124, 121, 0.22);
  box-shadow: none;
}
.btn--ghost:hover {
  background: #ffffff;
  border-color: rgba(81, 99, 81, 0.2);
  transform: none;
  box-shadow: var(--shadow-btn);
}

.btn--sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.8125rem;
}

.btn.is-disabled,
.btn[aria-disabled='true'] {
  opacity: 0.55;
  pointer-events: none;
  cursor: default;
}

/* ---- Layout ---- */
.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

/* ---- Hero ---- */
.hero {
  padding: var(--space-12) 0 clamp(3rem, 8vw, 4.5rem);
  position: relative;
  /* 不用 overflow:hidden：会把柔光/装饰裁成矩形硬边，和页面背景形成「切块」感 */
  overflow: visible;
  /* 与 body 顶区同系，内容区（hero__inner）叠在上面时边缘不会和背景「两道色」 */
  background: linear-gradient(180deg, #f7f8f6 0%, var(--page-bg) 42%, rgba(242, 244, 241, 0.96) 100%);
}

/* 与 body 同系色的大范围柔光，避免与页面背景「切块」感 */
.hero::before {
  content: '';
  position: absolute;
  inset: -45% -55% -18% -55%;
  background: radial-gradient(
    ellipse 130% 88% at 50% -8%,
    rgba(212, 232, 209, 0.2) 0%,
    rgba(212, 232, 209, 0.07) 52%,
    transparent 82%
  );
  pointer-events: none;
  z-index: 0;
  animation: hero-breathe 18s ease-in-out infinite alternate;
}

/* 首屏底部与全局背景柔边衔接，消除明显分界线 */
.hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: min(14rem, 32vw);
  background: linear-gradient(
    to bottom,
    rgba(242, 244, 241, 0) 0%,
    rgba(242, 244, 241, 0.45) 38%,
    var(--page-bg) 78%,
    var(--page-bg-soft) 100%
  );
  pointer-events: none;
  z-index: 1;
}

@keyframes hero-breathe {
  0% {
    opacity: 0.92;
    transform: scale(1);
  }
  100% {
    opacity: 1;
    transform: scale(1.02);
  }
}

.hero__orb {
  position: absolute;
  width: min(92vw, 540px);
  height: min(92vw, 540px);
  top: -12%;
  right: -8%;
  background: radial-gradient(circle at 40% 40%, rgba(212, 232, 209, 0.58) 0%, rgba(212, 232, 209, 0.1) 52%, transparent 70%);
  pointer-events: none;
  transform: translate(var(--orb-x, 0px), var(--orb-y, 0px));
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 0;
  filter: blur(0.5px);
}

.hero__orb--alt {
  top: auto;
  bottom: -8%;
  right: auto;
  left: -14%;
  width: min(78vw, 420px);
  height: min(78vw, 420px);
  background: radial-gradient(circle at 55% 45%, rgba(232, 228, 210, 0.45) 0%, rgba(212, 232, 209, 0.12) 55%, transparent 72%);
  opacity: 0.95;
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: var(--space-10);
  align-items: center;
}

@media (min-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr 1.05fr;
  }
}

.hero__content {
  position: relative;
}

.hero__brand-lockup {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: fit-content;
  margin: 0 0 var(--space-8);
}

.hero__logo {
  width: clamp(4.75rem, 8vw, 6.25rem);
  height: clamp(4.75rem, 8vw, 6.25rem);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  border-radius: 28px;
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.94) 0%, rgba(236, 239, 236, 0.92) 100%);
  border: 1px solid rgba(132, 144, 137, 0.12);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.82) inset, 0 24px 44px -20px rgba(45, 52, 50, 0.18);
}

.hero__logo img {
  width: 70%;
  height: 70%;
  object-fit: contain;
}

.hero__brand-copy {
  display: flex;
  align-items: center;
}

.hero__brand-name {
  display: inline-block;
  font-family: var(--font-headline);
  font-size: clamp(1.8rem, 3vw, 2.45rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.045em;
  background: linear-gradient(120deg, #1a211f 0%, #4a5c49 38%, #516351 55%, #3d4d3b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  filter: drop-shadow(0 1px 18px rgba(81, 99, 81, 0.08));
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: fit-content;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--color-primary-dim);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.75) 0%, var(--color-primary-container) 100%);
  backdrop-filter: blur(8px);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
  border: 1px solid rgba(81, 99, 81, 0.12);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.65) inset, 0 4px 14px rgba(81, 99, 81, 0.08);
}

.hero h1 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: clamp(1.55rem, 2.8vw, 2.05rem);
  line-height: 1.22;
  letter-spacing: -0.035em;
  margin: 0 0 var(--space-5);
  color: var(--color-on-background);
}

.hero h1.hero__h1-sub {
  margin: 0 0 var(--space-6);
  font-size: clamp(1.02rem, 2.1vw, 1.28rem);
  font-weight: 500;
  color: var(--color-on-surface-variant);
  letter-spacing: -0.015em;
  line-height: 1.45;
  max-width: 22em;
}

.hero__lead {
  font-size: 1.0625rem;
  font-weight: 400;
  color: var(--color-on-surface-variant);
  margin: 0 0 var(--space-8);
  max-width: 38rem;
  letter-spacing: -0.008em;
  line-height: 1.72;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero__meta {
  margin-top: var(--space-6);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-on-surface-variant);
  opacity: 0.92;
}

.hero__meta strong {
  color: var(--color-on-surface);
}

@media (min-width: 900px) {
  .hero__brand-lockup {
    margin-left: clamp(-1.25rem, -2vw, -0.35rem);
  }
}

/* ---- Showcase mock (app UI) ---- */
.showcase {
  perspective: 1200px;
  position: relative;
  z-index: 2;
}

.showcase__frame {
  border-radius: calc(var(--radius-xl) + 2px);
  background: #ffffff;
  border: 1px solid rgba(132, 144, 137, 0.1);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transform: rotateY(-3deg) rotateX(1.5deg);
  transition: transform 0.55s var(--ease-smooth), box-shadow 0.45s var(--ease-smooth);
}

.showcase__frame:hover {
  transform: rotateY(0deg) rotateX(0deg) translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.showcase__chrome {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.7rem 1.1rem;
  background: linear-gradient(180deg, #f2f4f2 0%, var(--color-surface-container-high) 100%);
  border-bottom: 1px solid rgba(118, 124, 121, 0.2);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset;
}

.showcase__dots {
  display: flex;
  gap: 6px;
}
.showcase__dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #c5ccc8;
}
.showcase__dots span:nth-child(1) {
  background: #e8a598;
}
.showcase__dots span:nth-child(2) {
  background: #e8d598;
}
.showcase__dots span:nth-child(3) {
  background: #a4d4a0;
}

.showcase__title {
  flex: 1;
  text-align: center;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-on-surface-variant);
  letter-spacing: 0.02em;
}

.showcase__body {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 320px;
}

@media (max-width: 640px) {
  .showcase__body {
    grid-template-columns: 1fr;
  }
  .showcase__sidebar {
    display: none;
  }
}

@media (max-width: 720px) {
  .site-nav__inner {
    gap: var(--space-4);
  }

  .site-nav__links {
    gap: var(--space-4);
  }

  .hero__brand-lockup {
    gap: var(--space-3);
    margin: 0 0 var(--space-5);
  }

  .hero__logo {
    border-radius: 24px;
  }
}

.showcase__sidebar {
  background: var(--color-surface-container);
  border-right: 1px solid var(--color-outline);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.showcase__nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.5rem 0.65rem;
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-on-surface-variant);
}
.showcase__nav-item--active {
  background: var(--color-surface-container-lowest);
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: var(--shadow-btn);
}

.showcase__main {
  padding: var(--space-5) var(--space-6);
  background: linear-gradient(180deg, #fafaf8 0%, var(--color-surface-container-lowest) 100%);
}

.showcase__topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-outline);
}

.showcase__brand {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 0.8rem;
  color: var(--color-on-surface);
}

.showcase__pill {
  font-size: 0.65rem;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-container);
  color: var(--color-primary);
  font-weight: 600;
}

.showcase__doc-title {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.15rem;
  margin: 0 0 var(--space-4);
  color: var(--color-on-surface);
}

.showcase__block {
  margin-bottom: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-container-lowest);
  border-radius: 12px;
  border: 1px solid rgba(132, 144, 137, 0.15);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--color-on-surface-variant);
}

.showcase__block--quote {
  border-left: 3px solid var(--color-primary);
  font-style: italic;
}

.showcase__code {
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, monospace;
  font-size: 0.72rem;
  background: linear-gradient(165deg, #353d3b 0%, #2a302e 100%);
  color: #e8ebe9;
  padding: var(--space-4);
  border-radius: 12px;
  margin-top: var(--space-3);
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 12px 32px -12px rgba(0, 0, 0, 0.35);
}

/* ---- Sections ---- */
.section {
  padding: clamp(2.75rem, 6vw, 4rem) 0;
}

.section--muted {
  background: linear-gradient(180deg, var(--page-bg-soft) 0%, var(--color-surface-container-low) 55%, #e9ece9 100%);
  border-top: 1px solid rgba(118, 124, 121, 0.12);
  border-bottom: 1px solid rgba(118, 124, 121, 0.1);
  box-shadow: none;
}

.section--compare {
  padding-top: var(--space-10);
  background: linear-gradient(180deg, var(--page-bg) 0%, rgba(238, 241, 238, 0.85) 45%, var(--page-bg-soft) 100%);
}

.compare-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 880px) {
  .compare-grid {
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
  }
}

.compare-card {
  position: relative;
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.97) 0%, rgba(252, 252, 250, 0.92) 45%, var(--color-surface-container-lowest) 100%);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-radius: calc(var(--radius-xl) + 4px);
  padding: var(--space-8) var(--space-6) var(--space-6);
  border: 1px solid rgba(132, 144, 137, 0.12);
  box-shadow: var(--shadow-card);
  transition: transform 0.45s var(--ease-smooth), box-shadow 0.45s var(--ease-smooth), border-color 0.35s ease;
  overflow: hidden;
}

.compare-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-container));
  opacity: 0.85;
}

.compare-card--alt::before {
  background: linear-gradient(90deg, #7a8f76, var(--color-primary-container));
}

.compare-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(81, 99, 81, 0.18);
}

.compare-card__badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-dim);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.7) 0%, var(--color-primary-container) 100%);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
  border: 1px solid rgba(81, 99, 81, 0.1);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset;
}

.compare-card h3 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
  margin: 0 0 var(--space-4);
  color: var(--color-on-background);
}

.compare-card__list {
  margin: 0;
  padding: 0 0 0 1.1rem;
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
  line-height: 1.7;
}

.compare-card__list li {
  margin-bottom: var(--space-3);
}

.compare-card__list strong {
  color: var(--color-on-surface);
}

.compare-card__note {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-4);
  border-top: 1px dashed rgba(118, 124, 121, 0.35);
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  line-height: 1.65;
}

.compare-grid .compare-card.reveal:nth-child(2) {
  transition-delay: 0.1s;
}

.hero__lead code {
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--color-surface-container);
  color: var(--color-primary-dim);
}

/* ---- Scroll reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.grid--3 .card.reveal:nth-child(1) {
  transition-delay: 0.03s;
}
.grid--3 .card.reveal:nth-child(2) {
  transition-delay: 0.08s;
}
.grid--3 .card.reveal:nth-child(3) {
  transition-delay: 0.13s;
}
.grid--3 .card.reveal:nth-child(4) {
  transition-delay: 0.05s;
}
.grid--3 .card.reveal:nth-child(5) {
  transition-delay: 0.1s;
}
.grid--3 .card.reveal:nth-child(6) {
  transition-delay: 0.15s;
}

.dl-grid .dl-card.reveal:nth-child(1) {
  transition-delay: 0.04s;
}
.dl-grid .dl-card.reveal:nth-child(2) {
  transition-delay: 0.09s;
}
.dl-grid .dl-card.reveal:nth-child(3) {
  transition-delay: 0.14s;
}
.dl-grid .dl-card.reveal:nth-child(4) {
  transition-delay: 0.06s;
}
.dl-grid .dl-card.reveal:nth-child(5) {
  transition-delay: 0.11s;
}
.dl-grid .dl-card.reveal:nth-child(6) {
  transition-delay: 0.16s;
}
.dl-grid .dl-card.reveal:nth-child(7) {
  transition-delay: 0.2s;
}

.section__head {
  max-width: 640px;
  margin-bottom: var(--space-8);
}

.section__head h2 {
  position: relative;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.2vw, 1.95rem);
  margin: 0 0 var(--space-3);
  letter-spacing: -0.03em;
  padding-left: calc(var(--space-4) + 6px);
  color: var(--color-on-background);
}

.section__head h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.12em;
  bottom: 0.12em;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, #5a6e58 0%, var(--color-primary) 40%, var(--color-primary-container) 100%);
  box-shadow: 0 0 12px rgba(81, 99, 81, 0.25);
}

.section__head p {
  margin: 0;
  color: var(--color-on-surface-variant);
  font-size: 0.9375rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.68;
  max-width: 38rem;
}

/* ---- Feature grid ---- */
.grid {
  display: grid;
  gap: var(--space-4);
}

/* 三列时顶部对齐：避免某张卡片（如 Git）过高时，同行「主题与语言」等被拉高，底部出现大块空白 */
.grid.grid--3 {
  align-items: start;
}

@media (min-width: 640px) {
  .grid.grid--3 {
    grid-template-columns: repeat(3, 1fr);
    column-gap: var(--space-4);
    row-gap: var(--space-5);
  }
}

.card {
  background: #ffffff;
  border-radius: calc(var(--radius-2xl) + 2px);
  padding: var(--space-6) var(--space-6) var(--space-6);
  border: 1px solid rgba(132, 144, 137, 0.1);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.45s var(--ease-smooth), transform 0.4s var(--ease-smooth), border-color 0.35s ease;
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-5px);
  border-color: rgba(81, 99, 81, 0.16);
}

.card__icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--color-primary-container), rgba(212, 232, 209, 0.55));
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
  transition: transform 0.35s var(--ease-smooth);
}

.card:hover .card__icon {
  transform: scale(1.06);
}

.card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-2);
  color: var(--color-on-background);
}

.card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
  line-height: 1.65;
}

/* ---- Tech strip ---- */
.tech-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  align-items: center;
  padding: var(--space-6) var(--space-8);
  margin-top: var(--space-8);
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(132, 144, 137, 0.12);
  box-shadow: var(--shadow-card);
}

.tech-strip span {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  padding: 0.42rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-container-lowest);
  border: 1px solid rgba(118, 124, 121, 0.1);
  box-shadow: none;
  transition: transform 0.3s var(--ease-smooth), background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.tech-strip span:hover {
  transform: translateY(-1px);
  background: var(--color-primary-container);
  color: var(--color-primary-dim);
  border-color: rgba(81, 99, 81, 0.12);
}

/* ---- Download ---- */
.dl-grid {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 720px) {
  .dl-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.dl-card {
  position: relative;
  background: #ffffff;
  border-radius: calc(var(--radius-2xl) + 2px);
  padding: var(--space-6) var(--space-6) var(--space-6);
  border: 1px solid rgba(132, 144, 137, 0.1);
  box-shadow: var(--shadow-card);
  transition: transform 0.4s var(--ease-smooth), box-shadow 0.45s var(--ease-smooth), border-color 0.3s ease;
  overflow: hidden;
}

.dl-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-container));
  opacity: 0;
  transition: opacity 0.35s ease;
}

.dl-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(81, 99, 81, 0.16);
}

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

.dl-card--ios {
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.5) 0%, var(--color-surface-container-low) 100%);
  border-style: dashed;
  border-color: rgba(118, 124, 121, 0.42);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset;
}

.dl-card--ios::before {
  display: none;
}

.dl-card--ios:hover {
  transform: none;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.55) inset;
}

.dl-card__badge-ios {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  background: rgba(118, 124, 121, 0.14);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.dl-card__ios-copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
  line-height: 1.65;
}

.dl-card--ios h3 {
  color: var(--color-on-surface-variant);
}

.dl-card--ios .dl-card__ios-copy {
  margin-bottom: 0;
}

.dl-card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-on-background);
}

.dl-card p {
  margin: 0 0 var(--space-4);
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
}

.dl-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.dl-card__muted {
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  line-height: 1.55;
}

/* ---- Footer ---- */
.site-footer {
  padding: clamp(2.5rem, 5vw, 3.5rem) 0 calc(var(--space-12) + 0.5rem);
  margin-top: var(--space-10);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  background: linear-gradient(180deg, transparent 0%, rgba(240, 242, 240, 0.75) 28%, #e5e9e6 100%);
  border-top: 1px solid rgba(118, 124, 121, 0.2);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.03em;
  color: var(--color-on-surface);
  margin-bottom: var(--space-4);
}

.site-footer__brand img {
  border-radius: 14px;
  background: linear-gradient(165deg, #ffffff 0%, var(--color-surface-container) 100%);
  padding: 7px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.85) inset, 0 0 0 1px rgba(132, 144, 137, 0.1), var(--shadow-btn);
}

.site-footer__tagline {
  margin: 0 auto var(--space-3);
  max-width: 30rem;
  line-height: 1.65;
  font-weight: 400;
  letter-spacing: -0.01em;
  opacity: 0.92;
}

.site-footer__actions {
  margin: 0 0 var(--space-3);
}

.site-footer__contact {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0.35rem 0.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-primary);
  background: none;
  border: none;
  border-bottom: 1px solid transparent;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}

.site-footer__contact .material-symbols-outlined {
  font-size: 1.1rem;
  opacity: 0.85;
}

.site-footer__contact:hover {
  color: var(--color-primary-dim);
  border-bottom-color: rgba(81, 99, 81, 0.35);
}

.site-footer__contact:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: 4px;
}

.site-footer__copy {
  margin: var(--space-5) 0 0;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.55;
}

.site-footer a {
  font-weight: 600;
}

@media (max-width: 900px) {
  .site-nav__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-3) var(--space-4);
    padding: 0.9rem 0;
  }

  .site-nav__links {
    grid-column: 1 / -1;
    order: 3;
    flex-wrap: nowrap;
    gap: var(--space-4);
    overflow-x: auto;
    padding: 0.1rem 0 0.2rem;
    scrollbar-width: none;
  }

  .site-nav__links::-webkit-scrollbar {
    display: none;
  }

  .site-nav .btn--sm {
    padding-inline: 1rem;
  }

  .hero {
    padding: var(--space-10) 0 clamp(2.75rem, 8vw, 4rem);
  }

  .hero__orb {
    width: min(120vw, 480px);
    height: min(120vw, 480px);
    top: -6%;
    right: -28%;
  }

  .hero__orb--alt {
    left: -26%;
    bottom: -4%;
  }

  .hero__inner {
    gap: var(--space-8);
  }

  .hero__content {
    max-width: 40rem;
  }

  .hero__brand-lockup {
    margin: 0 0 var(--space-6);
  }

  .hero__eyebrow {
    margin-bottom: var(--space-4);
  }

  .hero h1.hero__h1-sub {
    margin: 0 0 var(--space-5);
  }

  .hero__lead {
    margin: 0 0 var(--space-6);
    max-width: 34rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .hero__meta {
    margin-top: var(--space-5);
  }

  .showcase__frame {
    transform: none;
    border-radius: 22px;
  }

  .showcase__main {
    padding: var(--space-5);
  }

  .section {
    padding: clamp(2.4rem, 7vw, 3.4rem) 0;
  }

  .section__head {
    margin-bottom: var(--space-6);
  }

  .compare-card,
  .card,
  .dl-card {
    padding: var(--space-6);
  }

  .tech-strip {
    justify-content: flex-start;
    padding: var(--space-5);
  }

  .site-footer {
    padding: var(--space-10) 0 calc(var(--space-10) + 0.5rem);
  }
}

@media (max-width: 560px) {
  .wrap {
    padding: 0 1rem;
  }

  .site-nav__brand {
    font-size: 1rem;
  }

  .site-nav__links {
    gap: var(--space-3);
  }

  .site-nav__links a {
    font-size: 0.8125rem;
    white-space: nowrap;
  }

  .site-nav .btn--sm {
    font-size: 0.75rem;
    padding: 0.5rem 0.82rem;
  }

  .hero {
    padding-top: var(--space-8);
  }

  .hero__brand-lockup {
    gap: 0.85rem;
    margin-bottom: var(--space-5);
  }

  .hero__logo {
    width: 4.25rem;
    height: 4.25rem;
    border-radius: 22px;
  }

  .hero__brand-name {
    font-size: 1.55rem;
  }

  .hero__eyebrow {
    font-size: 0.625rem;
    padding: 0.38rem 0.72rem;
  }

  .hero h1.hero__h1-sub {
    font-size: 1rem;
    line-height: 1.5;
    max-width: 18em;
  }

  .hero__lead {
    font-size: 0.96rem;
    line-height: 1.68;
  }

  .showcase__chrome,
  .showcase__main {
    padding-inline: var(--space-4);
  }

  .showcase__topbar {
    margin-bottom: var(--space-4);
  }

  .showcase__doc-title {
    font-size: 1rem;
  }

  .showcase__block,
  .showcase__code {
    font-size: 0.75rem;
  }

  .compare-card,
  .card,
  .dl-card {
    border-radius: 20px;
    padding: var(--space-5);
  }

  .compare-card h3,
  .dl-card h3,
  .card h3 {
    font-size: 1rem;
  }

  .compare-card__list,
  .card p,
  .dl-card p,
  .dl-card__ios-copy {
    font-size: 0.84rem;
  }

  .tech-strip {
    gap: var(--space-2);
    padding: var(--space-4);
  }

  .site-footer__brand {
    flex-direction: column;
    gap: var(--space-2);
  }

  .site-footer__tagline {
    max-width: 22rem;
    font-size: 0.8125rem;
  }
}

.btn:focus-visible,
.site-nav__links a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.btn--primary:focus-visible {
  color: var(--color-on-primary);
}