/* 站点全局样式：主题色等在 :root；改完保存后刷新浏览器即可（直接打开 html 预览时同样生效） */
/* Design tokens — aligned with former Tailwind @theme */
:root {
  /* 系统字体栈：file:// 打开时不依赖外网 */
  --font-sans:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    "PingFang SC",
    "Microsoft YaHei UI",
    "Microsoft YaHei",
    sans-serif;
  --color-lab-blue: #0f172a;
  --color-technical-slate: #475569;
  --color-sky-accent: #e31837;
  --color-on-surface-variant: #45464d;
  --color-outline-variant: #c6c6cd;
  --color-on-surface: #191c1e;
  --color-surface-container-low: #f2f4f6;
  --color-surface: #f7f9fb;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-500: #64748b;
  --slate-800: #1e293b;
  --emerald-500: #10b981;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-surface);
  color: var(--color-on-surface);
}

::selection {
  background: rgba(227, 24, 55, 0.3);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* Layout */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.max-w-7xl {
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 50;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-outline-variant) 20%, transparent);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: 80rem;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .nav__inner {
    padding: 1rem 2rem;
  }
}

.nav__brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-lab-blue);
}

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

a.nav__brand:hover {
  color: var(--color-sky-accent);
}

.nav__links {
  display: none;
  align-items: center;
  gap: 2rem;
  font-weight: 500;
  letter-spacing: -0.025em;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__link {
  color: var(--color-technical-slate);
  transition: color 0.2s;
}

.nav__link:hover {
  color: var(--color-lab-blue);
}

.nav__link--active {
  color: var(--color-sky-accent);
  font-weight: 600;
  border-bottom: 2px solid var(--color-sky-accent);
  padding-bottom: 0.25rem;
}

.nav__cta {
  display: none;
  background: var(--color-lab-blue);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: 0.375rem;
  font-weight: 500;
  font-size: 0.875rem;
  transition: background 0.2s, transform 0.15s;
}

.nav__cta:hover {
  background: var(--slate-800);
}

.nav__cta:active {
  transform: scale(0.95);
}

@media (min-width: 640px) {
  .nav__cta {
    display: block;
  }
}

.nav__menu-btn {
  color: var(--color-lab-blue);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav__icon-close {
  display: none;
}

.nav.nav--menu-open .nav__icon-hamburger {
  display: none;
}

.nav.nav--menu-open .nav__icon-close {
  display: block;
}

@media (min-width: 768px) {
  .nav__menu-btn {
    display: none;
  }
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile dropdown */
.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 1rem;
  background: #fff;
  border-bottom: 1px solid color-mix(in srgb, var(--color-outline-variant) 20%, transparent);
  padding: 1rem 1.5rem 1.25rem;
  opacity: 0;
  transform: translateY(-12px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.mobile-nav.is-open {
  display: flex;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none !important;
  }
}

.mobile-nav__link {
  color: var(--color-technical-slate);
}

.mobile-nav__link--active {
  color: var(--color-sky-accent);
  font-weight: 600;
}

.mobile-nav__cta {
  background: var(--color-lab-blue);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: 0.375rem;
  font-weight: 500;
  font-size: 0.875rem;
  width: 100%;
  text-align: center;
}

a.mobile-nav__cta {
  text-decoration: none;
  display: block;
  box-sizing: border-box;
}

/* Icons (stroke Lucide-style) */
.icon {
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon--14 {
  width: 14px;
  height: 14px;
}

.icon--18 {
  width: 18px;
  height: 18px;
}

.icon--24 {
  width: 24px;
  height: 24px;
}

.icon--32 {
  width: 32px;
  height: 32px;
}

.icon--48 {
  width: 48px;
  height: 48px;
}

.btn-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    #fff,
    rgba(255, 255, 255, 0.6),
    transparent
  );
}

.hero__content-wrap {
  position: relative;
  z-index: 10;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

@media (min-width: 768px) {
  .hero__content-wrap {
    padding: 0 2rem;
  }
}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.hero__content {
  max-width: 42rem;
  animation: hero-in 0.8s ease forwards;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: var(--color-lab-blue);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  border-radius: 0.125rem;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-lab-blue);
  line-height: 1.1;
  margin: 0 0 2rem;
}

@media (min-width: 768px) {
  .hero__title {
    font-size: 4.5rem;
  }
}

.hero__title-accent {
  color: var(--color-sky-accent);
}

.hero__lead {
  font-size: 1.125rem;
  color: var(--color-technical-slate);
  line-height: 1.625;
  margin: 0 0 2.5rem;
  opacity: 0.9;
  max-width: 36rem;
}

@media (min-width: 768px) {
  .hero__lead {
    font-size: 1.25rem;
  }
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn-primary {
  background: var(--color-sky-accent);
  color: #fff;
  padding: 1rem 2rem;
  border-radius: 0.375rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  transition: box-shadow 0.2s, transform 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  box-shadow: 0 10px 15px -3px rgba(227, 24, 55, 0.2);
}

.btn-primary:active {
  transform: scale(0.95);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 30%, transparent);
  color: var(--color-lab-blue);
  padding: 1rem 2rem;
  border-radius: 0.375rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  transition: background 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background: #fff;
}

a.btn-primary,
a.btn-secondary {
  text-decoration: none;
}

@keyframes float-badge-in {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__float-card {
  position: absolute;
  bottom: 3rem;
  right: 3rem;
  z-index: 20;
  display: none;
  animation: float-badge-in 0.6s ease 0.5s forwards;
  opacity: 0;
}

@media (min-width: 1024px) {
  .hero__float-card {
    display: block;
  }
}

.glass-panel {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero__float-inner {
  padding: 1.5rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.hero__float-icon {
  width: 3rem;
  height: 3rem;
  background: var(--color-sky-accent);
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.hero__float-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-on-surface-variant);
  text-transform: uppercase;
}

.hero__float-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-lab-blue);
}

.hero__float-sub {
  font-size: 11px;
  color: var(--color-technical-slate);
}

/* Philosophy */
.philosophy {
  padding: 6rem 0;
  background: var(--color-surface-container-low);
}

.philosophy__grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4rem;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (min-width: 768px) {
  .philosophy__grid {
    padding: 0 2rem;
  }
}

@media (min-width: 1024px) {
  .philosophy__grid {
    flex-direction: row;
  }
}

.philosophy__col {
  width: 100%;
}

@media (min-width: 1024px) {
  .philosophy__col--text {
    width: 50%;
  }
  .philosophy__col--visual {
    width: 50%;
  }
}

.philosophy__eyebrow {
  color: var(--color-sky-accent);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-size: 0.75rem;
}

.philosophy__h2 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-lab-blue);
  margin: 0 0 1.5rem;
}

.philosophy__p {
  font-size: 1.125rem;
  color: var(--color-technical-slate);
  line-height: 1.625;
  margin: 0 0 2rem;
}

.philosophy__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.philosophy__stat-val {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-lab-blue);
  margin-bottom: 0.25rem;
}

.philosophy__stat-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-on-surface-variant);
  text-transform: uppercase;
}

.philosophy__card-wrap {
  position: relative;
}

.philosophy__glow {
  position: absolute;
  inset: -1rem;
  background: rgba(227, 24, 55, 0.1);
  border-radius: 1rem;
  filter: blur(24px);
  transition: background 0.5s;
}

.philosophy__card-wrap:hover .philosophy__glow {
  background: rgba(227, 24, 55, 0.2);
}

.philosophy__card {
  position: relative;
  padding: 2rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.philosophy__card-row {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.philosophy__icon-wrap {
  padding: 0.75rem;
  background: rgba(227, 24, 55, 0.1);
  border-radius: 0.5rem;
  color: var(--color-sky-accent);
}

.philosophy__card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-lab-blue);
  margin: 0 0 0.75rem;
}

.philosophy__card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.625;
  color: var(--color-on-surface-variant);
}

/* Bento / projects */
.projects {
  padding: 8rem 0;
  background: #fff;
  position: relative;
  overflow: hidden;
}

.projects__inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 10;
}

@media (min-width: 768px) {
  .projects__inner {
    padding: 0 2rem;
  }
}

.projects__head {
  text-align: center;
  margin-bottom: 5rem;
}

.projects__head h2 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-lab-blue);
  margin: 0 0 1rem;
}

.projects__rule {
  height: 4px;
  width: 5rem;
  background: var(--color-sky-accent);
  margin: 0 auto;
}

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

@media (min-width: 768px) {
  .bento {
    grid-template-columns: repeat(12, 1fr);
  }

  .bento__large {
    grid-column: span 8;
    height: 400px;
    aspect-ratio: auto;
  }

  .bento__small {
    grid-column: span 4;
    height: 400px;
    aspect-ratio: auto;
  }

  .bento__wide {
    grid-column: span 8;
  }
}

.project-card {
  position: relative;
  overflow: hidden;
  border-radius: 0.75rem;
  background: var(--slate-100);
  aspect-ratio: 16 / 9;
  transition: transform 0.25s ease;
}

@media (min-width: 768px) {
  .project-card.bento__large,
  .project-card.bento__small {
    aspect-ratio: auto;
  }
}

.project-card--square {
  aspect-ratio: 1;
}

@media (min-width: 768px) {
  .project-card--square.bento__small {
    aspect-ratio: auto;
  }
}

.project-card:hover {
  transform: translateY(-5px);
}

.project-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.2);
  transition: background 0.5s;
  pointer-events: none;
}

.project-card:hover .project-card__overlay {
  background: rgba(15, 23, 42, 0.1);
}

.project-card__caption {
  position: absolute;
  bottom: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
}

.project-card__caption--narrow {
  right: auto;
}

.project-card__pill {
  display: inline-block;
  padding: 1rem 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.5rem;
}

.project-card__pill--sm {
  padding: 0.75rem 1.25rem;
}

.project-card__tag {
  display: block;
  font-size: 10px;
  color: var(--color-sky-accent);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.project-card__title {
  color: #fff;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 0;
}

.project-card__title--lg {
  font-size: 1.5rem;
}

.project-card__title--md {
  font-size: 1.25rem;
}

.project-card__desc {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.875rem;
  margin-top: 0.5rem;
  max-width: 28rem;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s, transform 0.5s;
}

.project-card:hover .project-card__desc {
  opacity: 1;
  transform: translateY(0);
}

.bento__info {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-container-low);
  border-radius: 0.75rem;
  padding: 3rem;
  text-align: center;
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 20%, transparent);
}

@media (min-width: 768px) {
  .bento__info {
    grid-column: span 8;
  }
}

.bento__info-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--color-sky-accent);
}

.bento__info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-lab-blue);
  margin: 0 0 1rem;
}

.bento__info p {
  margin: 0 auto;
  max-width: 32rem;
  color: var(--color-on-surface-variant);
}

/* AI badge strip */
.ai-strip {
  display: flex;
  justify-content: center;
  padding: 3rem 0;
  background: #fff;
}

.ai-strip__inner {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--slate-50);
  border-radius: 9999px;
  border: 1px solid var(--slate-100);
}

.ai-strip__dot {
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  background: var(--emerald-500);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.ai-strip__text {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--slate-500);
  letter-spacing: 0.025em;
}

/* Footer */
.site-footer {
  width: 100%;
  padding: 3rem 0;
  background: var(--slate-50);
  border-top: 1px solid color-mix(in srgb, var(--color-outline-variant) 20%, transparent);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 0 1.5rem;
  max-width: 80rem;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .site-footer__inner {
    flex-direction: row;
    padding: 0 2rem;
  }
}

.site-footer__brand {
  font-weight: 700;
  color: var(--color-lab-blue);
  margin-bottom: 0.5rem;
  font-size: 1.125rem;
}

.site-footer__copy {
  font-size: 0.875rem;
  letter-spacing: 0.025em;
  color: var(--color-technical-slate);
  margin: 0;
  text-align: center;
}

@media (min-width: 768px) {
  .site-footer__copy {
    text-align: left;
  }
}

.site-footer__links {
  display: flex;
  gap: 2rem;
}

.site-footer__links a {
  font-size: 0.875rem;
  color: var(--color-technical-slate);
  transition: color 0.2s;
}

.site-footer__links a:hover {
  color: var(--color-sky-accent);
}

/* FAB mobile */
.fab {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 40;
}

.fab__btn {
  width: 3.5rem;
  height: 3.5rem;
  background: var(--color-sky-accent);
  color: #fff;
  border-radius: 9999px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s;
}

.fab__btn:active {
  transform: scale(0.9);
}

@media (min-width: 640px) {
  .fab {
    display: none;
  }
}

/* —— 应用下载页（与主站色板 / 毛玻璃一致）—— */
.dl-page {
  min-height: 100vh;
  padding: 6rem 1rem 4rem;
  background: var(--color-surface-container-low);
}

@media (min-width: 768px) {
  .dl-page {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.dl-page__inner {
  max-width: 28rem;
  margin: 0 auto;
}

.dl-card {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 1.75rem;
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 25%, transparent);
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.12);
  overflow: hidden;
}

.dl-card__head {
  background: var(--color-lab-blue);
  color: #fff;
  padding: 2rem 1.5rem;
  text-align: center;
}

.dl-card__head h1 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.dl-card__head-meta {
  margin: 0.35rem 0 0;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.75;
  color: rgba(255, 255, 255, 0.85);
}

.dl-card__body {
  padding: 2rem;
}

.dl-icon-wrap {
  position: relative;
  width: 5rem;
  height: 5rem;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 35%, transparent);
  background: #fff;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px -8px rgba(15, 23, 42, 0.12);
}

.dl-icon-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.dl-icon-fallback {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-sky-accent);
  letter-spacing: -0.02em;
}

.dl-icon-wrap--error .dl-icon-fallback {
  display: flex;
}

.dl-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid color-mix(in srgb, var(--color-outline-variant) 25%, transparent);
}

.dl-row h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-lab-blue);
}

.dl-row p {
  margin: 0.35rem 0 0;
  font-size: 0.875rem;
  color: var(--color-technical-slate);
}

.dl-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: flex-end;
}

.dl-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 0.35rem 0.65rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.dl-badge--android {
  background: rgba(227, 24, 55, 0.1);
  color: var(--color-sky-accent);
  border: 1px solid rgba(227, 24, 55, 0.2);
}

.dl-badge--ios {
  background: rgba(15, 23, 42, 0.06);
  color: var(--color-lab-blue);
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 40%, transparent);
}

.dl-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.dl-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.25rem;
  border-radius: 1rem;
  font-weight: 700;
  font-size: 0.9375rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition:
    transform 0.15s,
    box-shadow 0.2s,
    background 0.2s;
}

.dl-btn:active {
  transform: scale(0.97);
}

.dl-btn--primary {
  background: var(--color-sky-accent);
  color: #fff;
  box-shadow: 0 10px 25px -8px rgba(227, 24, 55, 0.45);
}

.dl-btn--primary:hover {
  filter: brightness(1.05);
}

.dl-btn--secondary {
  background: var(--color-lab-blue);
  color: #fff;
  box-shadow: 0 10px 25px -8px rgba(15, 23, 42, 0.35);
}

.dl-btn--secondary:hover {
  background: var(--slate-800);
}

.dl-btn--ghost {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--color-technical-slate);
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 35%, transparent);
  margin-top: 0.25rem;
}

.dl-btn--ghost:hover {
  background: #fff;
  color: var(--color-lab-blue);
}

.dl-note {
  margin-top: 1.75rem;
  padding: 1.15rem 1.25rem;
  border-radius: 1rem;
  background: rgba(227, 24, 55, 0.06);
  border: 1px solid rgba(227, 24, 55, 0.15);
}

.dl-note p {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.6;
  font-weight: 600;
  color: var(--color-lab-blue);
}

.dl-card__foot {
  padding: 1.25rem 1.5rem;
  text-align: center;
  background: rgba(248, 250, 252, 0.85);
  border-top: 1px solid color-mix(in srgb, var(--color-outline-variant) 22%, transparent);
}

.dl-card__foot p {
  margin: 0;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-technical-slate);
  opacity: 0.85;
}

/* 安装说明全屏层 */
.dl-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow-y: auto;
  display: none;
}

.dl-modal.is-open {
  display: block;
}

body.dl-modal-open {
  overflow: hidden;
}

.dl-modal__inner {
  max-width: 28rem;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.dl-modal__bar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-outline-variant) 22%, transparent);
}

.dl-modal__back {
  padding: 0.5rem;
  margin-left: -0.25rem;
  border: none;
  background: transparent;
  border-radius: 9999px;
  color: var(--color-technical-slate);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dl-modal__back:hover {
  background: var(--color-surface-container-low);
  color: var(--color-lab-blue);
}

.dl-modal__bar h2 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-lab-blue);
}

.dl-modal__content {
  flex: 1;
  padding: 1.5rem 1.25rem 5rem;
}

.dl-guide-section {
  margin-bottom: 2.5rem;
}

.dl-guide-section h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-sky-accent);
}

.dl-guide-section--ios h3 {
  color: var(--color-lab-blue);
}

.dl-guide-num {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  background: rgba(227, 24, 55, 0.12);
  color: var(--color-sky-accent);
}

.dl-guide-section--ios .dl-guide-num {
  background: rgba(15, 23, 42, 0.08);
  color: var(--color-lab-blue);
}

.dl-step {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.dl-step:last-child {
  margin-bottom: 0;
}

.dl-step__n {
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  border-radius: 9999px;
  background: var(--color-lab-blue);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.125rem;
}

.dl-step p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--color-technical-slate);
}

.dl-step strong {
  display: block;
  color: var(--color-lab-blue);
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.dl-modal__bottom {
  margin-top: auto;
  padding: 1.25rem;
  border-top: 1px solid color-mix(in srgb, var(--color-outline-variant) 22%, transparent);
  background: rgba(248, 250, 252, 0.9);
}

.dl-modal__bottom .dl-btn {
  border-radius: 1rem;
}

/* 技术页：内嵌地坪孪生计算（原 Vite 构建产物，独立资源与逻辑） */
.tech-embed {
  padding-top: 5rem;
  min-height: calc(100vh - 5rem);
  background: var(--color-surface-container-low);
}

.tech-embed__frame {
  width: 100%;
  height: calc(100vh - 5rem);
  min-height: 36rem;
  border: 0;
  display: block;
  background: var(--color-surface);
}

.tech-embed__frame--locked {
  display: none !important;
}

.tech-auth-gate {
  min-height: calc(100vh - 5rem);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  background: linear-gradient(
    180deg,
    var(--color-surface-container-low) 0%,
    var(--color-surface) 100%
  );
}

.tech-auth-gate--off {
  display: none !important;
}

.tech-auth-gate__card {
  max-width: 26rem;
  width: 100%;
  padding: 2.5rem 2rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 28%, transparent);
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.12);
  text-align: center;
}

.tech-auth-gate__card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.375rem;
  color: var(--color-lab-blue);
}

.tech-auth-gate__card p {
  margin: 0 0 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-technical-slate);
}

.tech-auth-gate__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.tech-auth-gate__note {
  margin-top: 1.25rem;
  font-size: 0.75rem;
  color: var(--color-on-surface-variant);
}

.site-footer__logout {
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-sky-accent);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  font-family: inherit;
}

.site-footer__logout:hover {
  opacity: 0.85;
}

/* 登录 / 注册页 */
.auth-page {
  min-height: 100vh;
  padding: 6rem 1rem 3rem;
  background: var(--color-surface-container-low);
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.auth-card {
  width: 100%;
  max-width: 22rem;
  padding: 2rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 28%, transparent);
  box-shadow: 0 20px 40px -12px rgba(15, 23, 42, 0.1);
}

.auth-card h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
  color: var(--color-lab-blue);
}

.auth-card__sub {
  margin: 0 0 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-technical-slate);
}

.auth-field {
  margin-bottom: 1rem;
  text-align: left;
}

.auth-field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-lab-blue);
  margin-bottom: 0.35rem;
}

.auth-field input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.65rem 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid color-mix(in srgb, var(--color-outline-variant) 50%, transparent);
  font-size: 0.9375rem;
  font-family: inherit;
}

.auth-field input:focus {
  outline: none;
  border-color: var(--color-sky-accent);
  box-shadow: 0 0 0 3px rgba(227, 24, 55, 0.15);
}

.auth-submit {
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.85rem;
  border: none;
  border-radius: 0.5rem;
  background: var(--color-sky-accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
}

.auth-submit:hover {
  filter: brightness(1.05);
}

.auth-submit:active {
  transform: scale(0.98);
}

.auth-alt {
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--color-technical-slate);
  text-align: center;
}

.auth-alt a {
  color: var(--color-sky-accent);
  font-weight: 600;
}

.auth-msg {
  font-size: 0.8125rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.375rem;
  margin-bottom: 1rem;
  text-align: left;
}

.auth-msg--err {
  background: rgba(227, 24, 55, 0.08);
  color: var(--color-sky-accent);
  border: 1px solid rgba(227, 24, 55, 0.2);
}

.auth-msg--ok {
  background: rgba(16, 185, 129, 0.1);
  color: var(--slate-800);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.auth-hint {
  margin-top: 1rem;
  font-size: 0.6875rem;
  line-height: 1.5;
  color: var(--color-on-surface-variant);
  word-break: break-all;
}