/* ========== Reset & Tokens ========== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --c-primary: #00A876;
  --c-secondary: #E5A93D;
  --c-bg-dark: #0B1D2A;
  --c-bg-light: #122B3B;
  --c-text: #FFFFFF;
  --c-muted: #A0B4C4;
  --c-burgundy: #8E1B3A;
  --c-indigo: #3B2D8E;
  --c-border: rgba(0, 168, 118, 0.6);
  --p-rgb: 0, 168, 118;
  --s-rgb: 229, 169, 61;
  --font-head: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  --h1: 80px;
  --h2: 64px;
  --h3: 48px;
  --h4: 36px;
  --h5: 28px;
  --body: 16px;
  --index: 12px;
  --lh: 1.7;
  --track: 0.08em;
  --radius-lg: 24px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --container: 1240px;
  --header-h: 84px;
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.25);
  --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.35);
  --ease: 0.2s ease;
  --ease-med: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

html,
body {
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--body);
  line-height: var(--lh);
  background: var(--c-bg-dark);
  color: var(--c-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-text);
}

h1 { font-size: var(--h1); }
h2 { font-size: var(--h2); }
h3 { font-size: var(--h3); }
h4 { font-size: var(--h4); }
h5 { font-size: var(--h5); }

p {
  margin-bottom: 1em;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--ease);
}

a:hover {
  color: #00C489;
}

ul,
ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

::selection {
  background: rgba(var(--p-rgb), 0.35);
  color: var(--c-text);
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* ========== Accessibility Skip Link ========== */
.ak-skip {
  position: fixed;
  top: -120%;
  left: 16px;
  z-index: 2000;
  background: var(--c-primary);
  color: var(--c-text);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  padding: 14px 24px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: 0 8px 24px rgba(var(--p-rgb), 0.35);
  transition: top var(--ease);
}

.ak-skip:focus-visible {
  top: 0;
  color: var(--c-text);
}

/* ========== Header ========== */
.ak-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 29, 42, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(var(--p-rgb), 0.22);
}

.ak-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 12px,
    rgba(var(--p-rgb), 0.025) 12px,
    rgba(var(--p-rgb), 0.025) 14px
  );
  pointer-events: none;
}

.ak-header__in {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.ak-header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--c-primary), var(--c-secondary));
  border-radius: 0 999px 999px 0;
  z-index: 2;
}

/* ========== Brand ========== */
.ak-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  color: var(--c-text);
}

.ak-brand:hover {
  color: var(--c-text);
}

.ak-brand__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--c-primary) 0%, #007A58 100%);
  color: var(--c-text);
  border-radius: 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.02em;
  box-shadow: 0 4px 16px rgba(var(--p-rgb), 0.35);
}

.ak-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.ak-brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.ak-brand__slogan {
  font-size: 12px;
  color: var(--c-muted);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

/* ========== Navigation ========== */
.ak-nav__head {
  display: none;
}

.ak-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ak-nav__item {
  position: relative;
}

.ak-nav__link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  color: var(--c-text);
  font-size: 15px;
  font-weight: 500;
  transition: background var(--ease), color var(--ease);
}

.ak-nav__link:hover {
  background: rgba(var(--p-rgb), 0.12);
  color: var(--c-primary);
}

.ak-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: var(--track);
  color: var(--c-secondary);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--ease), transform var(--ease);
}

.ak-nav__link:hover .ak-nav__index,
.ak-nav__link[aria-current="page"] .ak-nav__index {
  opacity: 1;
  transform: translateY(0);
}

.ak-nav__link[aria-current="page"] {
  color: var(--c-primary);
  font-weight: 700;
  background: rgba(var(--p-rgb), 0.1);
}

/* ========== Header CTA ========== */
.ak-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-primary);
  color: var(--c-text);
  font-weight: 700;
  font-size: 14px;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 20px rgba(var(--p-rgb), 0.3);
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
  white-space: nowrap;
}

.ak-cta:hover {
  background: #00C489;
  color: var(--c-text);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(var(--p-rgb), 0.4);
}

/* ========== Mobile Nav Toggle ========== */
.ak-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 48px;
  height: 48px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(var(--p-rgb), 0.1);
  transition: background var(--ease);
  z-index: 210;
}

.ak-nav-toggle:hover {
  background: rgba(var(--p-rgb), 0.2);
}

.ak-nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
}

/* ========== Mobile Navigation (<=960px) ========== */
@media (max-width: 960px) {
  .ak-header__in {
    padding: 0 16px;
    gap: 12px;
  }

  .ak-brand__slogan {
    display: none;
  }

  .ak-cta {
    display: none;
  }

  .ak-nav-toggle {
    display: flex;
  }

  .ak-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(380px, 88vw);
    background: linear-gradient(160deg, #163244 0%, #0F2433 100%);
    border-left: 1px solid rgba(var(--p-rgb), 0.2);
    transform: translateX(100%);
    transition: transform var(--ease-med);
    z-index: 200;
    padding: 24px;
    overflow-y: auto;
    box-shadow: -30px 0 80px rgba(0, 0, 0, 0.4);
  }

  .ak-nav[data-open] {
    transform: translateX(0);
  }

  .ak-nav[data-open] ~ .ak-nav-toggle {
    visibility: hidden;
    opacity: 0;
  }

  .ak-nav__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(var(--p-rgb), 0.25);
  }

  .ak-nav__head-brand {
    font-family: var(--font-head);
    font-weight: 900;
    font-size: 18px;
    color: var(--c-text);
  }

  .ak-nav__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(var(--p-rgb), 0.12);
    color: var(--c-text);
    font-size: 22px;
    line-height: 1;
    transition: background var(--ease), color var(--ease);
  }

  .ak-nav__close:hover {
    background: var(--c-primary);
    color: var(--c-text);
  }

  .ak-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .ak-nav__link {
    padding: 14px 16px;
    font-size: 17px;
    border-radius: var(--radius-md);
  }

  .ak-nav__index {
    opacity: 1;
    transform: none;
    font-size: 11px;
    min-width: 24px;
  }
}

/* ========== Focus Visible ========== */
:focus-visible {
  outline: 2px solid var(--c-secondary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ========== Footer ========== */
.ak-footer {
  position: relative;
  background: #08151F;
  border-top: 2px solid rgba(var(--p-rgb), 0.3);
}

.ak-footer::before {
  content: "AK";
  position: absolute;
  top: -30px;
  right: 5%;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 180px;
  line-height: 1;
  color: rgba(var(--p-rgb), 0.05);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.ak-footer__in {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px 40px;
}

.ak-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 1fr;
  gap: 48px;
}

.ak-footer__brand .ak-brand {
  margin-bottom: 16px;
}

.ak-footer__slogan {
  font-size: 14px;
  color: var(--c-secondary);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.ak-footer__desc {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
  max-width: 280px;
}

.ak-footer__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: var(--track);
  color: var(--c-secondary);
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(var(--s-rgb), 0.25);
}

.ak-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ak-footer__link {
  color: var(--c-muted);
  font-size: 14px;
  transition: color var(--ease), padding-left var(--ease);
}

.ak-footer__link:hover {
  color: var(--c-primary);
  padding-left: 4px;
}

.ak-footer__contact-item {
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-muted);
  padding-left: 10px;
  border-left: 2px solid rgba(var(--s-rgb), 0.35);
}

.ak-footer__col p {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
}

.ak-footer__bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.ak-footer__bottom-in {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--c-muted);
}

.ak-footer__copy,
.ak-footer__icp {
  margin: 0;
}

/* ========== Back to Top ========== */
.ak-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-primary);
  color: var(--c-text);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(var(--p-rgb), 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--ease-med), transform var(--ease-med), visibility var(--ease-med), background var(--ease);
  z-index: 150;
}

.ak-top.ak-top--show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.ak-top:hover {
  background: #00C489;
}

/* ========== Container & Section ========== */
.ak-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.ak-section {
  position: relative;
  padding: 80px 0;
}

.ak-section--light {
  background: var(--c-bg-light);
}

.ak-section--burgundy {
  background: var(--c-burgundy);
}

.ak-section--indigo {
  background: var(--c-indigo);
}

/* ========== Section Head ========== */
.ak-section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 40px;
  position: relative;
}

.ak-section-head__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: var(--track);
  color: var(--c-secondary);
  border: 1px solid rgba(var(--s-rgb), 0.4);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  display: inline-block;
  width: max-content;
}

.ak-section-head__title {
  font-size: var(--h3);
  line-height: 1.15;
  color: var(--c-text);
}

.ak-section-head__sub {
  font-size: 14px;
  color: var(--c-muted);
  max-width: 720px;
}

/* ========== Breadcrumb ========== */
.ak-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--c-muted);
  margin-bottom: 32px;
}

.ak-breadcrumb__link {
  color: var(--c-muted);
  transition: color var(--ease);
}

.ak-breadcrumb__link:hover {
  color: var(--c-primary);
}

.ak-breadcrumb__sep {
  color: rgba(var(--s-rgb), 0.6);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ak-breadcrumb__current {
  color: var(--c-text);
  font-weight: 500;
}

/* ========== Buttons ========== */
.ak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease), transform var(--ease), box-shadow var(--ease);
  white-space: nowrap;
}

.ak-btn--primary {
  background: var(--c-primary);
  color: var(--c-text);
  box-shadow: 0 4px 16px rgba(var(--p-rgb), 0.3);
}

.ak-btn--primary:hover {
  background: #00C489;
  color: var(--c-text);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(var(--p-rgb), 0.4);
}

.ak-btn--outline {
  border-color: rgba(var(--p-rgb), 0.5);
  color: var(--c-primary);
  background: transparent;
}

.ak-btn--outline:hover {
  background: rgba(var(--p-rgb), 0.1);
  border-color: var(--c-primary);
  color: var(--c-primary);
}

/* ========== Card ========== */
.ak-card {
  background: var(--c-bg-light);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(var(--p-rgb), 0.12);
  overflow: hidden;
  transition: transform var(--ease-med), box-shadow var(--ease-med), border-color var(--ease-med);
}

.ak-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(var(--p-rgb), 0.35);
}

/* ========== Image Containers ========== */
.ak-image {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--c-bg-light);
  border: 1px solid rgba(var(--p-rgb), 0.12);
}

.ak-image--hero { aspect-ratio: 21 / 9; }
.ak-image--card { aspect-ratio: 16 / 10; }
.ak-image--tall { aspect-ratio: 3 / 4; }
.ak-image--circle { aspect-ratio: 1 / 1; border-radius: 50%; }

.ak-image img,
.ak-image > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--ease-med);
}

.ak-image:hover img,
.ak-image:hover > img {
  transform: scale(1.03);
}

.ak-image__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 29, 42, 0) 50%, rgba(11, 29, 42, 0.85) 100%);
  display: flex;
  align-items: flex-end;
  padding: 20px;
}

/* ========== Footer Responsive ========== */
@media (max-width: 960px) {
  .ak-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 560px) {
  .ak-footer {
    text-align: left;
  }

  .ak-footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .ak-footer__bottom-in {
    flex-direction: column;
    text-align: center;
    gap: 6px;
  }

  .ak-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

/* ========== Section Responsive ========== */
@media (max-width: 960px) {
  .ak-section {
    padding: 56px 0;
  }

  .ak-section-head__title {
    font-size: var(--h4);
  }

  h1 { font-size: var(--h2); }
  h2 { font-size: var(--h3); }
  h3 { font-size: var(--h4); }
  h4 { font-size: var(--h5); }
}

@media (max-width: 560px) {
  h1 { font-size: var(--h3); }
  h2 { font-size: var(--h4); }
  h3 { font-size: var(--h5); }
}

/* ========== Reduced Motion ========== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
    scroll-behavior: auto !important;
  }
}