/* ============ 三亿APP shared site kit ============ */

:root {
  --green: #0A6B3A;
  --dark-green: #064E27;
  --red: #D32F2F;
  --silver: #C5C7CD;
  --yellow: #D4FF00;
  --paper: #F5F0E6;
  --ink: #1A1A1A;
  --white: #FFFFFF;

  --font-heading: Impact, 'Arial Black', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  --font-number: 'Roboto Mono', 'JetBrains Mono', monospace;

  --fs-hero: clamp(2.5rem, 6vw, 5rem);
  --fs-section-title: clamp(1.75rem, 3vw, 2.5rem);
  --fs-card-title: 1.25rem;
  --fs-body: 1rem;
  --fs-caption: 0.875rem;

  --header-h: 76px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 10px);
}

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

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.1;
  margin: 0 0 1rem;
  font-weight: 900;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--green);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--red);
}

button,
input {
  font: inherit;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -4rem;
  left: 1rem;
  z-index: 2000;
  background: var(--yellow);
  color: var(--ink);
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  font-weight: 700;
  border-radius: 0 0 4px 4px;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--ink);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 1500;
  background: var(--yellow);
  box-shadow: 0 0 10px rgba(212, 255, 0, 0.7);
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(6, 78, 39, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(197, 199, 205, 0.35);
  box-shadow: 0 2px 18px rgba(0, 0, 0, 0.2);
}

.header-inner {
  position: relative;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 1rem;
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.5rem 1rem;
}

.brand {
  grid-column: 1;
  grid-row: 1;
  justify-self: start;
  display: inline-flex;
  flex-direction: column;
  line-height: 1.2;
  text-decoration: none;
  color: var(--paper);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  letter-spacing: 0.02em;
  color: var(--white);
  text-transform: uppercase;
}

.brand-tagline {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--silver);
}

.brand::after {
  content: "";
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--yellow) 0 60%, var(--red) 60% 100%);
  margin-top: 0.25rem;
}

.nav-toggle {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: 1px solid rgba(245, 240, 230, 0.3);
  color: var(--paper);
  padding: 0.6rem 0.75rem;
  cursor: pointer;
}

.nav-toggle-line,
.nav-toggle-line::before,
.nav-toggle-line::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--yellow);
  transition: transform 0.2s ease, opacity 0.2s ease, top 0.2s ease, background 0.2s ease;
}

.nav-toggle-line {
  position: relative;
}

.nav-toggle-line::before,
.nav-toggle-line::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
}

.nav-toggle-line::before {
  top: -6px;
}

.nav-toggle-line::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-toggle-text {
  font-size: 0.75rem;
}

.header-actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-search {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
}

.header-search::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border: 2px solid var(--yellow);
  border-radius: 50%;
  pointer-events: none;
}

.header-search::after {
  content: "";
  position: absolute;
  left: 1.35rem;
  top: 50%;
  width: 6px;
  height: 2px;
  background: var(--yellow);
  transform: translateY(-50%) rotate(45deg);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.45rem 0.75rem 0.45rem 2rem;
  background: rgba(245, 240, 230, 0.08);
  border: 1px solid rgba(245, 240, 230, 0.22);
  border-radius: 0;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.search-input::placeholder {
  color: rgba(245, 240, 230, 0.55);
}

.search-input:focus {
  outline: none;
  border-color: var(--yellow);
  background: rgba(245, 240, 230, 0.14);
}

.test-entry {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--yellow);
  color: var(--yellow);
  padding: 0.5rem 0.8rem;
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(212, 255, 0, 0.08);
  transition: background 0.2s ease, color 0.2s ease;
}

.test-entry:hover {
  background: var(--yellow);
  color: var(--ink);
}

.test-entry-dot {
  width: 8px;
  height: 8px;
  background: var(--red);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.25);
}

.test-entry:hover .test-entry-dot {
  background: var(--ink);
}

.header-nav {
  grid-column: 1 / -1;
  display: none;
  border-top: 1px solid rgba(245, 240, 230, 0.15);
  margin-top: 0.35rem;
  padding: 0.5rem 0;
}

.header-nav[data-open] {
  display: block;
}

.nav-list {
  list-style: none;
  counter-reset: navIndex 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
}

.nav-list li {
  counter-increment: navIndex;
}

.nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
  padding: 0.8rem 0.25rem;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border-bottom: 1px solid rgba(245, 240, 230, 0.08);
}

.nav-link::before {
  content: counter(navIndex, decimal-leading-zero) " /";
  font-family: var(--font-number);
  font-size: 0.625rem;
  color: var(--yellow);
  letter-spacing: 0;
}

.nav-link:hover {
  background: rgba(245, 240, 230, 0.08);
  color: var(--white);
}

.nav-link[aria-current="page"] {
  color: var(--yellow);
  border-bottom-color: var(--red);
  box-shadow: inset 0 2px 0 var(--red);
}

@media (min-width: 960px) {
  .header-inner {
    grid-template-columns: minmax(180px, 1fr) auto minmax(300px, 1fr);
  }

  .brand {
    grid-column: 1;
    grid-row: 1;
  }

  .nav-toggle {
    display: none;
  }

  .header-actions {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
  }

  .header-search {
    flex: 0 0 auto;
  }

  .search-input {
    width: 200px;
  }

  .header-nav {
    grid-column: 2;
    grid-row: 1;
    display: block;
    border-top: 0;
    margin-top: 0;
    padding: 0;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: 0.25rem;
  }

  .nav-link {
    justify-content: flex-start;
    padding: 0.5rem 0.65rem;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--red);
    box-shadow: inset 0 -2px 0 var(--red);
  }
}

/* ============ footer ============ */

.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--dark-green);
  color: rgba(245, 240, 230, 0.82);
  border-top: 4px solid var(--yellow);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0 68%, rgba(212, 255, 0, 0.08) 68% 100%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: 1280px;
  margin-inline: auto;
  padding: 4rem 1rem 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.footer-tagline {
  color: var(--silver);
  font-size: 0.8125rem;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
}

.trust-statement {
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 34rem;
  margin: 0;
  border-left: 3px solid var(--red);
  padding-left: 1rem;
}

.footer-heading {
  color: var(--white);
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 2px solid rgba(212, 255, 0, 0.4);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.footer-address {
  font-style: normal;
  display: grid;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-size: 0.875rem;
  color: rgba(245, 240, 230, 0.82);
}

.footer-address span {
  display: block;
}

.contact-note {
  font-size: 0.8125rem;
  color: rgba(245, 240, 230, 0.65);
  max-width: 24rem;
  margin-bottom: 0;
}

.footer-link-list {
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.footer-link-list a {
  color: rgba(245, 240, 230, 0.85);
  text-decoration: none;
  font-size: 0.875rem;
  border-bottom: 1px solid transparent;
}

.footer-link-list a:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

.footer-bottom {
  position: relative;
  border-top: 1px solid rgba(197, 199, 205, 0.25);
  padding: 1.25rem 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  max-width: 1280px;
  margin-inline: auto;
  font-family: var(--font-number);
  font-size: 0.8125rem;
  color: rgba(245, 240, 230, 0.7);
}

@media (min-width: 900px) {
  .footer-inner {
    grid-template-columns: 1.2fr 1.4fr 0.8fr;
    gap: 3rem;
  }
}

/* ============ shared page structure ============ */

.site-main {
  min-height: 60vh;
}

.container {
  width: min(1200px, 100% - 2rem);
  margin-inline: auto;
}

.section {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
}

.section-title {
  font-size: var(--fs-section-title);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-title::before {
  content: "";
  width: 0.9rem;
  height: 0.9rem;
  background: var(--red);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0 0 2rem;
  padding: 0.75rem 0;
  font-family: var(--font-number);
  font-size: 0.8125rem;
}

.breadcrumb a,
.breadcrumb span {
  color: var(--green);
}

.breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
}

.btn-primary {
  background: var(--red);
  border-color: var(--red);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--yellow);
}

.btn-outline {
  border-color: var(--green);
  color: var(--green);
}

.btn-outline:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--paper);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 1.5rem;
}

.card {
  position: relative;
  overflow: hidden;
  background: var(--white);
  border-left: 6px solid var(--green);
  border-bottom: 1px solid var(--silver);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-left: 28px solid transparent;
  border-bottom: 28px solid var(--yellow);
  opacity: 0.7;
}

.card:hover {
  border-left-color: var(--red);
  transform: translateY(-2px);
}

.data-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--dark-green);
  color: var(--yellow);
  font-family: var(--font-number);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  letter-spacing: 0.04em;
}

.data-value {
  font-family: var(--font-number);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--red);
  line-height: 1;
}

.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, var(--dark-green) 0%, var(--green) 55%, rgba(211, 47, 47, 0.7) 100%);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 10px,
    rgba(255, 255, 255, 0.12) 10px 20px
  );
  opacity: 0.4;
  pointer-events: none;
}

.media-frame::after {
  content: "IMG";
  position: absolute;
  right: 0.75rem;
  bottom: 0.6rem;
  font-family: var(--font-number);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.7);
  pointer-events: none;
}

.media-frame > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

/* ============ scroll reveal ============ */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  will-change: opacity, transform;
}

.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ============ reduced motion ============ */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0 !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .card:hover {
    transform: none;
  }
}