:root {
  /* Notion 风：暖灰/米白单色基底 */
  --bg-page: #F7F6F3;
  --bg-page-top: #F7F6F3;
  --bg-page-bottom: #F7F6F3;
  --bg-elevated: #FFFFFF;
  --bg-alt: #F0EFEC;
  --bg-dark: #1B1A18;
  --surface-card: #FFFFFF;
  --surface-dark: #242321;
  --stroke-soft: rgba(0, 0, 0, 0.06);
  --stroke-mid: rgba(0, 0, 0, 0.1);
  --text-primary: #1F1E1C;
  --text-secondary: #5D5850;
  --text-tertiary: #8A847A;
  --text-light: #F8F6F1;
  --text-light-secondary: rgba(248, 246, 241, 0.76);
  --action-primary: #1F1E1C;
  --action-primary-hover: #35322E;
  --action-on-primary: #FFFFFF;
  /* Tiggon 蓝色系 · 强调色 */
  --accent-cyan: #26D6FF;
  --accent-cyan-soft: rgba(38, 214, 255, 0.08);
  --accent-cyan-blob: rgba(140, 165, 185, 0.04);
  --accent-blue: #5EA6FF;
  --accent-blue-soft: rgba(94, 166, 255, 0.08);
  --accent-blue-blob: rgba(130, 155, 180, 0.03);
  --accent-light: #80B8FF;
  --accent-light-soft: rgba(128, 184, 255, 0.06);
  --accent-light-blob: rgba(145, 165, 185, 0.03);
  --blob-warm: rgba(248, 247, 245, 0.4);
  --blob-warm-blob: rgba(246, 245, 243, 0.25);
  --blob-cream: rgba(252, 251, 249, 0.25);
  --blob-cream-blob: rgba(250, 249, 247, 0.2);
  /* Notion 第一屏：深蓝 Hero（与官网一致） */
  --hero-bg: #0f172a;
  --hero-bg-center: #1e293b;
  --hero-text: #ffffff;
  --hero-text-secondary: rgba(255, 255, 255, 0.85);
  --hero-text-tertiary: rgba(255, 255, 255, 0.6);
  /* 区块：统一浅色（Hero 单独用 --hero-bg） */
  --section-hero: var(--hero-bg);
  --section-proof: var(--hero-bg);
  --section-intro: transparent;
  --section-method: transparent;
  --section-screens: var(--bg-alt);
  --section-programs: transparent;
  --section-founder: var(--bg-alt);
  --section-journal: transparent;
  --section-faq: var(--bg-alt);
  /* Notion 风：轻阴影、小圆角 */
  --shadow-soft: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
  --radius-s: 12px;
  --radius-m: 14px;
  --radius-card: 12px;
  --radius-l: 16px;
  --radius-round: 9999px;
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-28: 28px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;
  --space-80: 80px;
  --space-96: 96px;
  --space-112: 112px;
  --space-section: 88px;
  --page-padding: 32px;
  --container-max: 1160px;
  --content-max: 680px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  /* Typography: clearer hierarchy, editorial feel */
  --title-hero: 700 56px/1.08 var(--font-sans);
  --title-section: 600 34px/1.18 var(--font-sans);
  --title-card: 600 20px/1.28 var(--font-sans);
  --body-l: 400 18px/1.65 var(--font-sans);
  --body-m: 400 15px/1.6 var(--font-sans);
  --label: 600 12px/1.4 var(--font-sans);
}

/* ---- 背景插画 · 微动 MG 动画 ---- */
@keyframes blob-float {
  0%, 100% { transform: translate(0, 0) rotate(0deg) scale(1); }
  33% { transform: translate(2%, -1.5%) rotate(1deg) scale(1.02); }
  66% { transform: translate(-1.5%, 2%) rotate(-0.5deg) scale(0.98); }
}
@keyframes blob-float-slow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-2%, 1%) scale(1.03); }
}
@keyframes illo-pulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.65; transform: scale(1.08); }
}
@keyframes glow-breathe {
  0%, 100% { opacity: 0.35; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.15); }
}
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .atmosphere-blob,
  .atmosphere-illo {
    animation: none !important;
  }
}

html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg-page);
  min-height: 100vh;
  color: var(--text-primary);
  font-family: var(--font-sans);
}
img { max-width: 100%; }
a { color: inherit; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page {
  position: relative;
}
/* Notion 风：背景网格图案，替代 blob */
.page__atmosphere {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
/* 等距网格线：横线 + 竖线，约 24px 间距 */
.page__atmosphere::before {
  content: "";
  position: absolute;
  inset: 0;
  --grid-color: rgba(0, 0, 0, 0.03);
  background-image:
    linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}
.atmosphere-blob,
.atmosphere-illo {
  display: none;
}
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.header--scrolled {
  background: rgba(15, 23, 42, 0.98);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  border-color: rgba(255, 255, 255, 0.08);
}
/* 第一屏深蓝时：导航与 Logo 浅色 */
.header .logo { color: var(--hero-text); }
.header .nav__link { color: var(--hero-text-secondary); }
.header .nav__link:hover { color: var(--hero-text); }
.header .lang-switcher__btn {
  color: var(--hero-text-secondary);
  background: rgba(255, 255, 255, 0.1);
}
.header .lang-switcher__btn:hover { background: rgba(255, 255, 255, 0.15); color: var(--hero-text); }
.header .lang-switcher__btn[aria-expanded="true"] { background: rgba(255, 255, 255, 0.15); }
.header__cta--primary {
  background: #ffffff;
  color: var(--hero-bg);
}
.header__cta--primary:hover {
  background: rgba(255, 255, 255, 0.92);
  color: var(--hero-bg);
}
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  flex-shrink: 0;
}
.header__cta--primary {
  padding: 10px 18px;
  background: var(--action-primary);
  color: var(--action-on-primary);
  font: var(--label);
  text-decoration: none;
  border-radius: var(--radius-round);
  transition: background 0.2s ease;
}
.header__cta--primary:hover {
  background: var(--action-primary-hover);
}
.header__container,
.hero__container,
.proof-strip__container,
.intro-block__container,
.section-card__container,
.newsletter__container,
.footer__container {
  max-width: var(--container-max);
  margin: 0 auto;
}
.header__container {
  padding: 16px var(--page-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-24);
}
/* 多语言切换 */
.lang-switcher {
  position: relative;
  flex-shrink: 0;
}
.lang-switcher__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: rgba(31, 30, 28, 0.05);
  border: none;
  border-radius: var(--radius-round);
  color: var(--text-primary);
  font: var(--body-m);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background 0.2s ease;
}
.lang-switcher__btn:hover {
  background: rgba(31, 30, 28, 0.1);
}
.lang-switcher__btn[aria-expanded="true"] {
  background: rgba(31, 30, 28, 0.1);
}
.lang-switcher__icon,
.lang-switcher__chevron {
  flex-shrink: 0;
}
.lang-switcher__chevron {
  transition: transform 0.2s ease;
}
.lang-switcher__btn[aria-expanded="true"] .lang-switcher__chevron {
  transform: rotate(180deg);
}
.lang-switcher__dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 140px;
  margin: 0;
  padding: 6px 0;
  list-style: none;
  background: var(--surface-card);
  border: 1px solid var(--stroke-mid);
  border-radius: var(--radius-s);
  box-shadow: var(--shadow-soft);
  z-index: 200;
}
.lang-switcher__dropdown[hidden] {
  display: none;
}
.lang-switcher__option {
  display: block;
  width: 100%;
  padding: 10px 16px;
  border: none;
  background: none;
  color: var(--text-primary);
  font: var(--body-m);
  font-family: var(--font-sans);
  text-align: left;
  cursor: pointer;
  transition: background 0.15s ease;
}
.lang-switcher__option:hover {
  background: rgba(31, 30, 28, 0.06);
}
.lang-switcher__option[aria-current="true"] {
  font-weight: 600;
  color: var(--action-primary);
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font: 600 24px/1.2 var(--font-sans);
  letter-spacing: -0.03em;
}
.logo__icon { display: block; flex-shrink: 0; }
.nav__list {
  display: flex;
  list-style: none;
  gap: var(--space-24);
  margin: 0;
  padding: 0;
}
.nav__link {
  text-decoration: none;
  color: var(--text-secondary);
  font: var(--body-m);
  transition: color 0.2s ease;
}
.nav__link:hover { color: var(--text-primary); }
.header__cta,
.footer__download,
.btn,
.newsletter__form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: var(--radius-round);
  font: var(--label);
  transition: background 0.25s ease, color 0.2s ease, border-color 0.25s ease, opacity 0.2s ease;
}
.header__cta {
  padding: 11px 16px;
  background: rgba(31, 30, 28, 0.05);
  color: var(--text-primary);
}
.header__cta:hover { background: rgba(31, 30, 28, 0.1); }
.btn {
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid transparent;
}
.btn--primary {
  background: var(--action-primary);
  color: var(--action-on-primary);
}
.btn--primary:hover,
.newsletter__form button:hover,
.footer__download:hover {
  background: var(--action-primary-hover);
}
.btn--secondary {
  background: transparent;
  border: 1px solid var(--stroke-mid);
  color: var(--text-primary);
}
.btn--secondary:hover {
  background: rgba(31, 30, 28, 0.04);
  border-color: var(--stroke-soft);
}

/* Apple App Store badge (official SVG) */
.app-store-badge {
  display: inline-block;
  line-height: 0;
  background: none;
  min-height: 0;
  padding: 0;
  border: none;
  border-radius: 0;
  transition: opacity 0.2s ease;
}
.app-store-badge:hover {
  opacity: 0.85;
  background: none;
}
.app-store-badge img {
  display: block;
  height: 40px;
  width: auto;
}
.app-store-badge--sm img {
  height: 32px;
}

.hero {
  position: relative;
  z-index: 1;
  padding: var(--space-112) var(--page-padding) var(--space-96);
}
/* Notion 风：Hero 单列居中，visual 在文案下方 */
.hero__container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-64);
  align-items: center;
  justify-items: center;
  text-align: center;
}
.hero__content {
  max-width: var(--content-max);
}
.hero__title {
  margin-left: auto;
  margin-right: auto;
}
.hero__desc {
  margin-left: auto;
  margin-right: auto;
}
.hero__eyebrow,
.section-eyebrow {
  margin: 0 0 var(--space-16);
  font: var(--label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}
.section-eyebrow--light { color: rgba(248, 246, 241, 0.62); }
.hero__content .hero__eyebrow {
  animation: fade-in-up 0.6s ease-out both;
}
.hero__content .hero__title {
  animation: fade-in-up 0.6s ease-out 0.08s both;
}
.hero__content .hero__desc {
  animation: fade-in-up 0.6s ease-out 0.16s both;
}
.hero__content .hero__actions {
  animation: fade-in-up 0.6s ease-out 0.24s both;
}
.hero__content .hero__meta {
  animation: fade-in-up 0.6s ease-out 0.32s both;
}
@media (prefers-reduced-motion: reduce) {
  .hero__content .hero__eyebrow,
  .hero__content .hero__title,
  .hero__content .hero__desc,
  .hero__content .hero__actions,
  .hero__content .hero__meta { animation: none; }
}
.hero__title {
  margin: 0 0 var(--space-28);
  font: var(--title-hero);
  letter-spacing: -0.04em;
  max-width: 640px;
}
.hero__desc,
.section-text,
.newsletter__text {
  margin: 0;
  font: var(--body-l);
  color: var(--text-secondary);
}
.hero__desc {
  max-width: var(--content-max);
  font-size: 17px;
  line-height: 1.6;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-20);
  margin: var(--space-40) 0 var(--space-28);
}
.hero__meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.hero__meta li {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-round);
  border: 1px solid var(--stroke-soft);
  background: var(--surface-card);
  color: var(--text-secondary);
  font: var(--body-m);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
/* Notion 风：proof strip 轻量横条 */
.proof-strip__item {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: var(--radius-round);
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font: 400 13px/1.4 var(--font-sans);
}
.hero__visual {
  text-align: center;
  position: relative;
}
.hero__visual .device-cluster {
  position: relative;
  z-index: 1;
}
.device-cluster {
  position: relative;
  width: min(100%, 400px);
  height: 500px;
  margin: 0 auto;
  padding: var(--space-24);
  animation: blob-float-slow 14s ease-in-out infinite;
  will-change: transform;
}
@media (prefers-reduced-motion: reduce) {
  .device-cluster { animation: none; }
}
.device {
  position: absolute;
  width: 240px;
  height: 480px;
  border-radius: 36px;
  background: linear-gradient(165deg, #FFFFFF 0%, #F8F6F2 50%, #F2EDE6 100%);
  border: 1px solid rgba(31, 30, 28, 0.06);
  box-shadow: var(--shadow-soft), 0 0 0 1px rgba(255, 255, 255, 0.6) inset;
  overflow: hidden;
}
.device::before,
.screen-mock::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: 32%;
  height: 16px;
  border-radius: var(--radius-round);
  background: rgba(31, 30, 28, 0.06);
}
.device span,
.screen-mock span {
  position: absolute;
  inset: 48px 14px 14px;
  border: 1px dashed rgba(31, 30, 28, 0.1);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-tertiary);
  font: var(--label);
  padding: var(--space-16);
}
.device--back {
  left: 12px;
  top: 16px;
  transform: rotate(-6deg);
}
.device--front {
  right: 12px;
  top: 4px;
  transform: rotate(5deg);
}
.hero__caption {
  margin: var(--space-24) auto 0;
  max-width: 340px;
  color: var(--text-tertiary);
  font: var(--body-m);
  line-height: 1.5;
}

/* ---- 区块背景与节奏 ---- */
.hero {
  background: radial-gradient(ellipse 80% 70% at 50% 0%, var(--hero-bg-center) 0%, var(--hero-bg) 60%);
  color: var(--hero-text);
}
.hero__eyebrow,
.hero .section-eyebrow { color: var(--hero-text-tertiary); }
.hero__title { color: var(--hero-text); }
.hero__desc { color: var(--hero-text-secondary); }
.hero__meta li {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--hero-text-secondary);
}
.hero__caption { color: var(--hero-text-tertiary); }
.hero .btn--secondary {
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--hero-text);
}
.hero .btn--secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.7);
}
/* 深色 Hero 上徽章反色为白底黑字（object/img 均适用） */
.hero .app-store-badge object,
.hero .app-store-badge img,
.hero .app-store-badge svg {
  filter: brightness(0) invert(1);
  display: block;
  vertical-align: top;
}
.hero .app-store-badge object {
  pointer-events: none;
}
.proof-strip {
  padding: var(--space-40) var(--page-padding);
  background: var(--section-proof);
  color: var(--hero-text-secondary);
}
.proof-strip__item {
  color: var(--hero-text-tertiary);
}
.proof-strip__container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 0;
  max-width: var(--container-max);
  margin: 0 auto;
}
.intro-block {
  position: relative;
  z-index: 1;
  padding: var(--space-section) var(--page-padding);
  background: var(--section-intro);
}
.intro-block__container {
  max-width: var(--content-max);
  margin: 0 auto;
  text-align: center;
}
.intro-block .section-title {
  margin-bottom: var(--space-20);
}
.intro-block .section-text {
  margin: 0 auto;
}
/* Method 区块：浅蓝灰 */
.method.section-card {
  background: var(--section-method);
}
/* Screens 区块：暖白 */
.screens.section-card {
  background: var(--section-screens);
}
/* Programs 区块：浅青 */
.programs.section-card {
  background: var(--section-programs);
}
/* Founder 区块：暖米 */
.founder.section-card {
  background: var(--section-founder);
}
/* Journal 区块：浅灰 */
.journal.section-card {
  background: var(--section-journal);
}
/* FAQ 区块：浅米 */
.faq.section-card {
  background: var(--section-faq);
}

.section-card {
  position: relative;
  z-index: 1;
  padding: var(--space-section) var(--page-padding);
}
.section-card--alt {
  background: var(--bg-alt);
}
.section-title,
.newsletter__title {
  margin: 0 0 var(--space-20);
  font: var(--title-section);
  letter-spacing: -0.035em;
}
.section-card__container {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
}
.section-card__container--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.9fr);
  gap: var(--space-64);
  align-items: center;
}
.section-card__content { max-width: var(--content-max); }
.screens__intro,
.programs__intro,
.journal__intro,
.faq__intro {
  max-width: var(--content-max);
  margin-bottom: var(--space-48);
}
.bullet-list {
  margin: var(--space-28) 0 0;
  padding-left: 20px;
  display: grid;
  gap: 14px;
  color: var(--text-secondary);
  font: var(--body-l);
}
.section-card__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.screen-mock {
  position: relative;
  width: 100%;
  aspect-ratio: 0.62;
  background: linear-gradient(165deg, #FFFFFF 0%, #F8F6F2 50%, #F2EDE6 100%);
  border-radius: 24px;
  border: 1px solid rgba(31, 30, 28, 0.06);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
}
.screen-mock--large {
  max-width: 300px;
  margin-left: auto;
}
.screens__grid,
.programs__grid,
.journal__grid,
.faq__list {
  display: grid;
  gap: var(--space-28);
}
/* App Preview：三张手机截图并列一排 */
.screens__grid {
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto;
}
/* iPhone 竖屏比例，去掉白色背景（与区块底色一致） */
.screens__grid .screen-mock {
  aspect-ratio: 9 / 19.5;
  max-width: 200px;
  margin-left: auto;
  margin-right: auto;
  background: transparent;
  box-shadow: none;
  border-color: rgba(0, 0, 0, 0.08);
}
.screens__grid .screen-mock span {
  border-color: rgba(0, 0, 0, 0.06);
  background: transparent;
}
.screens .screen-card {
  background: transparent;
  border-color: var(--stroke-soft);
}
.screen-card:nth-child(1),
.screen-card:nth-child(2),
.screen-card:nth-child(3) {
  grid-column: auto;
  grid-row: auto;
}
.screen-card {
  margin: 0;
  display: grid;
  gap: var(--space-20);
  padding: var(--space-20);
  background: var(--surface-card);
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.screen-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--stroke-mid);
}
.screen-card figcaption {
  display: grid;
  gap: 8px;
  color: var(--text-secondary);
  font: var(--body-m);
}
.screen-card strong { color: var(--text-primary); font: var(--label); }
.screen-card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  color: var(--accent-blue);
  font: var(--label);
  text-decoration: none;
  transition: color 0.2s ease;
}
.screen-card__link:hover { color: var(--text-primary); }
/* Notion 风 Bento：Programs 左一大卡跨两行 + 右二小卡 + 底一宽卡 */
.programs__grid {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: var(--space-24);
}
.program-card:nth-child(1) { grid-column: 1; grid-row: 1 / 3; }
.program-card:nth-child(2) { grid-column: 2; grid-row: 1; }
.program-card:nth-child(3) { grid-column: 2; grid-row: 2; }
.program-card:nth-child(4) { grid-column: 1 / -1; grid-row: 3; }
.program-card,
.journal-card {
  background: var(--surface-card);
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius-card);
  padding: var(--space-24);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.program-card:hover,
.journal-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--stroke-mid);
}
.program-card__arrow,
.card-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: var(--space-12);
  color: var(--accent-blue);
  font: var(--label);
  text-decoration: none;
  transition: color 0.2s ease;
}
.program-card__arrow:hover,
.card-link-arrow:hover { color: var(--text-primary); }
.program-card__arrow::after,
.card-link-arrow::after {
  content: "→";
  font-size: 14px;
}
.program-card__meta {
  margin-bottom: 10px;
  color: var(--text-tertiary);
  font: var(--label);
  letter-spacing: 0.02em;
}
.program-card h3,
.journal-card h3,
.faq-item h3,
.founder__note h3 {
  margin: 0 0 10px;
  font: var(--title-card);
  letter-spacing: -0.02em;
}
.program-card p,
.journal-card p,
.faq-item p,
.founder__note p,
.founder__note {
  margin: 0;
  color: var(--text-secondary);
  font: var(--body-m);
}
.founder__split { align-items: start; }
.journal__grid { grid-template-columns: repeat(3, 1fr); }
.journal-card a {
  display: inline-flex;
  margin-top: var(--space-20);
  text-decoration: none;
  color: var(--text-primary);
  font: var(--label);
  transition: color 0.2s ease;
}
.journal-card a:hover { color: var(--text-secondary); }

/* FAQ：分割线串联，留白充足 */
.faq__list {
  max-width: var(--content-max);
  margin: 0 auto;
}
.faq-item {
  background: transparent;
  border: none;
  border-radius: 0;
  border-bottom: 1px solid var(--stroke-soft);
  padding: var(--space-28) 0;
  margin: 0;
}
.faq__list .faq-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.faq__list .faq-item:first-child {
  padding-top: 0;
}

/* Founder 旁注：左边线 + 淡底，保持引用感 */
.founder__note {
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--stroke-soft);
  border-left: 3px solid var(--text-tertiary);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  padding: var(--space-24) var(--space-24) var(--space-24) var(--space-24);
}

.newsletter {
  position: relative;
  z-index: 1;
  padding: var(--space-64) var(--page-padding);
}
/* Newsletter：只圆一侧，打破「整块圆角卡」的固定感 */
.newsletter__container {
  background: var(--bg-dark);
  color: var(--text-light);
  border-radius: 0 var(--radius-l) var(--radius-l) 0;
  padding: var(--space-48);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: var(--space-40);
  align-items: center;
}
.newsletter__text { color: var(--text-light-secondary); }
.newsletter__form {
  display: flex;
  gap: 12px;
}
.newsletter__form input {
  flex: 1;
  min-height: 50px;
  border-radius: var(--radius-round);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-light);
  padding: 0 16px;
  font: var(--body-m);
}
.newsletter__form input::placeholder { color: rgba(248, 246, 241, 0.5); }
.newsletter__form button,
.footer__download:not(.app-store-badge) {
  min-height: 50px;
  padding: 0 18px;
  border: none;
  background: #FFFFFF;
  color: var(--text-primary);
  cursor: pointer;
}

main {
  position: relative;
  z-index: 1;
}
.footer {
  position: relative;
  z-index: 1;
  padding: 0 var(--page-padding) var(--space-64);
  background: var(--bg-alt);
}
.footer__container {
  padding-top: var(--space-48);
  padding-bottom: var(--space-24);
  border-top: 1px solid var(--stroke-soft);
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(200px, 1fr) minmax(160px, auto);
  gap: var(--space-48) var(--space-32);
  align-items: start;
}
.footer__brand {
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.footer__tagline {
  margin: 10px 0 0;
  color: var(--text-secondary);
  font: var(--body-m);
}
.footer__brand .footer__download {
  margin-top: var(--space-16);
}
.footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}
.footer__col-title {
  margin: 0;
  font: var(--label);
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer__links a {
  text-decoration: none;
  color: var(--text-secondary);
  font: var(--body-m);
  transition: color 0.2s ease;
}
.footer__links a:hover { color: var(--text-primary); }

/* 平板及以下：单列布局，顶部/底部 App Store 区域居中 */
@media (max-width: 1120px) {
  .hero__container,
  .section-card__container--split,
  .newsletter__container,
  .footer__container {
    grid-template-columns: 1fr;
  }
  .footer__container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-32);
  }
  .footer__brand { text-align: center; max-width: none; align-items: center; }
  .footer__col { align-items: center; text-align: center; }
  .footer__links { align-items: center; }
  .hero__content,
  .hero__visual,
  .section-card__content,
  .intro-block__container,
  .screens__intro,
  .programs__intro,
  .journal__intro,
  .faq__intro,
  .newsletter__container {
    text-align: center;
  }
  .hero__desc,
  .section-text,
  .newsletter__text {
    margin-left: auto;
    margin-right: auto;
  }
  .hero__actions,
  .hero__meta,
  .proof-strip__container,
  .newsletter__form,
  .footer__links {
    justify-content: center;
  }
  .footer__download {
    margin-top: var(--space-8);
  }
  .screen-mock--large { margin: 0 auto; }
}

@media (max-width: 900px) {
  .screens__grid,
  .journal__grid,
  .programs__grid,
  .faq__list {
    grid-template-columns: 1fr;
    grid-template-rows: none;
  }
  .screen-card:nth-child(1),
  .screen-card:nth-child(2),
  .screen-card:nth-child(3) {
    grid-column: auto;
    grid-row: auto;
  }
  .program-card:nth-child(1),
  .program-card:nth-child(2),
  .program-card:nth-child(3),
  .program-card:nth-child(4) {
    grid-column: auto;
    grid-row: auto;
  }
}

@media (max-width: 768px) {
  :root {
    --page-padding: 24px;
    --title-hero: 700 40px/1.08 var(--font-sans);
    --title-section: 600 28px/1.2 var(--font-sans);
    --body-l: 400 17px/1.6 var(--font-sans);
    --space-section: 64px;
  }
  .nav { display: none; }
  .hero {
    padding-top: var(--space-96);
    padding-bottom: var(--space-80);
  }
  .section-card {
    padding: var(--space-section) var(--page-padding);
  }
  .section-card__container,
  .newsletter__container {
    padding: 0;
  }
  .device-cluster {
    width: 300px;
    height: 420px;
    padding: var(--space-16);
  }
  .device {
    width: 200px;
    height: 400px;
  }
  .screen-card,
  .program-card,
  .journal-card {
    padding: var(--space-20);
  }
}

/* 手机尺寸：上部/底部 App Store 均居中，按钮不强制拉满宽 */
@media (max-width: 560px) {
  .hero__actions,
  .newsletter__form {
    flex-direction: column;
    align-items: center;
  }
  .hero__actions .app-store-badge,
  .hero__actions .btn {
    width: auto;
    max-width: 100%;
  }
  .btn,
  .newsletter__form button,
  .header__cta {
    width: 100%;
    box-sizing: border-box;
  }
  .footer__download {
    width: auto;
  }
  .header__container {
    gap: 12px;
    align-items: stretch;
    flex-wrap: wrap;
  }
  .logo { justify-content: center; width: 100%; }
}