/* ==================================================
   AK竞技 Site Kit / 共享样式
   ================================================== */

/* 1. 变量 */
:root {
  --ak-red: #E63946;
  --ak-red-bright: #FF6B6B;
  --ak-black: #0B0B0D;
  --ak-graphite: #1A1A1D;
  --ak-gray: #9A9A9A;
  --ak-cyan: #00F5D4;
  --ak-cyan-deep: #00C9A7;
  --ak-white: #FFFFFF;
  --ak-light: #F5F5F5;

  --ak-font-heading: "Anton", "Arial Narrow", Impact, "PingFang SC", "Microsoft YaHei", sans-serif;
  --ak-font-body: "IBM Plex Sans", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --ak-space-1: 0.5rem;
  --ak-space-2: 1rem;
  --ak-space-3: 1.5rem;
  --ak-space-4: 2.5rem;
  --ak-space-5: 4rem;
  --ak-space-6: 6.5rem;

  --ak-radius: 4px;
  --ak-radius-lg: 12px;
  --ak-radius-pill: 999px;

  --ak-transition-fast: 0.2s ease;
  --ak-transition-base: 0.35s ease;
  --ak-ease: cubic-bezier(0.22, 1, 0.36, 1);

  --ak-container-max: 1280px;
  --ak-header-z: 1000;
  --ak-progress-z: 1001;
  --ak-skip-z: 2000;
}

/* 2. Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--ak-black);
  color: var(--ak-light);
  font-family: var(--ak-font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main, #main-content {
  display: block;
}

#main-content {
  flex: 1 0 auto;
  width: 100%;
  padding-top: clamp(5.5rem, 12vw, 6.5rem);
  scroll-margin-top: 90px;
}

/* 3. 排版 */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  color: var(--ak-white);
  font-family: var(--ak-font-heading);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  margin-bottom: 0.4em;
  font-size: clamp(2.75rem, 6vw, 4.5rem);
}

h2 {
  font-size: clamp(1.9rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
}

h4 {
  font-size: clamp(1.1rem, 1.8vw, 1.4rem);
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--ak-cyan);
  text-decoration: none;
  transition: color var(--ak-transition-fast);
}

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

strong, b {
  color: var(--ak-white);
  font-weight: 700;
}

em, i {
  font-style: italic;
}

ul, ol {
  padding-left: 1.4em;
}

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

/* 4. 容器 */
.ak-container {
  width: 100%;
  max-width: var(--ak-container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

/* 5. 跳过链接 */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: var(--ak-skip-z);
  padding: 12px 20px;
  background: var(--ak-red);
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--ak-radius);
  color: var(--ak-white);
  font-family: var(--ak-font-body);
  font-size: 0.9rem;
  font-weight: 700;
  transition: top var(--ak-transition-fast);
}

.skip-link:focus {
  top: 16px;
  box-shadow: 0 6px 24px rgba(230, 57, 70, 0.5);
}

/* 6. 页头 */
.ak-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--ak-header-z);
  padding: clamp(10px, 2vw, 18px) clamp(12px, 3vw, 28px) 0;
  pointer-events: none;
}

.ak-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--ak-container-max);
  margin-inline: auto;
  padding: 8px 14px;
  background: rgba(11, 11, 13, 0.9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 245, 212, 0.22);
  border-radius: var(--ak-radius-pill);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  pointer-events: auto;
}

.ak-header__inner::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 1.5rem;
  width: 4rem;
  height: 3px;
  border-radius: 2px;
  background: var(--ak-red);
  box-shadow: 0 0 8px rgba(230, 57, 70, 0.6);
  opacity: 0.85;
}

/* 7. 品牌 */
.ak-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ak-white);
  font-family: var(--ak-font-heading);
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

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

.ak-brand__icon {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: var(--ak-red);
  color: var(--ak-white);
  font-size: 1.1rem;
  transform: skew(-6deg);
  box-shadow: 0 0 16px rgba(230, 57, 70, 0.4);
  transition: background var(--ak-transition-fast), transform var(--ak-transition-fast);
}

.ak-brand:hover .ak-brand__icon {
  background: var(--ak-red-bright);
  transform: skew(-6deg) scale(1.05);
}

.ak-brand__text {
  font-family: var(--ak-font-heading);
}

.ak-brand--footer {
  font-size: 1.7rem;
}

/* 8. 导航 */
.ak-nav {
  display: block;
}

.ak-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.ak-nav__link {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--ak-radius-pill);
  color: rgba(245, 245, 245, 0.8);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--ak-transition-fast), background var(--ak-transition-fast), box-shadow var(--ak-transition-fast);
}

.ak-nav__link:hover {
  background: rgba(0, 245, 212, 0.08);
  color: var(--ak-cyan);
}

.ak-nav__link[aria-current="page"] {
  background: var(--ak-red);
  color: var(--ak-white);
  box-shadow: 0 2px 12px rgba(230, 57, 70, 0.45);
}

.ak-nav__link[aria-current="page"]:hover {
  background: var(--ak-red-bright);
  color: var(--ak-white);
}

/* 9. 页头工具区 */
.ak-header__tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ak-header__hint {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 2px solid var(--ak-cyan);
  border-radius: var(--ak-radius);
  color: var(--ak-gray);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* 10. 移动导航按钮 */
.ak-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0;
  background: var(--ak-graphite);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--ak-radius-lg);
  cursor: pointer;
  transition: border-color var(--ak-transition-fast), background var(--ak-transition-fast);
}

.ak-nav-toggle:hover {
  background: rgba(0, 245, 212, 0.06);
  border-color: var(--ak-cyan);
}

.ak-nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--ak-white);
  transition: transform 0.28s var(--ak-ease), opacity 0.2s;
}

.ak-nav-toggle.is-active .ak-nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.ak-nav-toggle.is-active .ak-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.ak-nav-toggle.is-active .ak-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 11. 滚动进度条 */
.ak-scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: var(--ak-progress-z);
  pointer-events: none;
  background: linear-gradient(90deg, var(--ak-red), var(--ak-cyan));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* 12. 页脚 */
.ak-footer {
  position: relative;
  flex-shrink: 0;
  margin-top: clamp(3rem, 8vw, 5rem);
  overflow: hidden;
  background: var(--ak-black);
  border-top: 3px solid var(--ak-red);
}

.ak-footer::before {
  content: "";
  position: absolute;
  top: -3px;
  right: 0;
  width: 18%;
  height: 3px;
  background: var(--ak-cyan);
  pointer-events: none;
}

.ak-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: clamp(1.5rem, 3vw, 3rem);
  max-width: var(--ak-container-max);
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1rem, 4vw, 2.5rem) 2.5rem;
}

.ak-footer__desc {
  margin-top: 12px;
  color: var(--ak-gray);
  font-size: 0.95rem;
  line-height: 1.6;
}

.ak-footer__trust {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--ak-red);
  color: rgba(245, 245, 245, 0.5);
  font-size: 0.8rem;
  line-height: 1.7;
}

.ak-footer__title {
  margin-bottom: 14px;
  color: var(--ak-white);
  font-family: var(--ak-font-heading);
  font-size: 1.02rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ak-footer__list {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.ak-footer__list a {
  display: inline-block;
  color: rgba(245, 245, 245, 0.65);
  font-size: 0.9rem;
  transition: color var(--ak-transition-fast), padding-left var(--ak-transition-fast);
}

.ak-footer__list a:hover {
  color: var(--ak-cyan);
  padding-left: 4px;
}

.ak-footer__contact {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.ak-footer__contact li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: rgba(245, 245, 245, 0.75);
  font-size: 0.88rem;
  line-height: 1.5;
}

.ak-footer__label {
  flex-shrink: 0;
  min-width: 34px;
  margin-top: 3px;
  color: var(--ak-cyan);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ak-footer__note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  color: var(--ak-gray);
  font-size: 0.78rem;
  line-height: 1.6;
}

.ak-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 14px 0;
}

.ak-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: var(--ak-container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
  color: var(--ak-gray);
  font-size: 0.82rem;
}

.ak-footer__bottom-inner p {
  margin: 0;
}

/* 13. 按钮 */
.ak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border: 0;
  border-radius: var(--ak-radius);
  background: var(--ak-red);
  color: var(--ak-white);
  font-family: var(--ak-font-body);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  text-align: center;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--ak-transition-fast), color var(--ak-transition-fast), transform var(--ak-transition-fast), box-shadow var(--ak-transition-fast);
}

.ak-btn:hover {
  background: var(--ak-red-bright);
  color: var(--ak-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.4);
}

.ak-btn:active {
  transform: none;
}

.ak-btn--ghost {
  padding-block: 11px;
  background: transparent;
  border: 2px solid var(--ak-cyan);
  color: var(--ak-cyan);
}

.ak-btn--ghost:hover {
  background: rgba(0, 245, 212, 0.1);
  border-color: var(--ak-cyan);
  box-shadow: 0 0 20px rgba(0, 245, 212, 0.25);
  color: var(--ak-cyan);
}

.ak-btn--small {
  padding: 8px 16px;
  font-size: 0.8rem;
}

/* 14. 标签 */
.ak-tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border: 1px solid rgba(0, 245, 212, 0.3);
  border-radius: var(--ak-radius);
  background: rgba(0, 245, 212, 0.08);
  color: var(--ak-cyan);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-transform: uppercase;
}

.ak-tag--red {
  background: rgba(230, 57, 70, 0.1);
  border-color: rgba(230, 57, 70, 0.35);
  color: var(--ak-red);
}

/* 15. 卡片 */
.ak-card {
  position: relative;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--ak-graphite);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--ak-radius-lg);
  transition: transform var(--ak-transition-base), border-color var(--ak-transition-base), box-shadow var(--ak-transition-base);
}

.ak-card:hover {
  border-color: var(--ak-red);
  box-shadow: 0 12px 32px rgba(230, 57, 70, 0.18);
  transform: translateY(-4px);
}

.ak-card--accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  border-radius: var(--ak-radius-lg) 0 0 var(--ak-radius-lg);
  background: var(--ak-cyan);
}

.ak-card--accent-red::before {
  background: var(--ak-red);
}

/* 16. 网格 */
.ak-grid {
  display: grid;
  gap: 1.5rem;
}

.ak-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ak-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.ak-grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* 17. 图片容器 */
.ak-media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ak-graphite);
  border-radius: var(--ak-radius);
}

.ak-media img,
.ak-media video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ak-ease), filter var(--ak-transition-base);
}

.ak-media:hover img {
  transform: scale(1.04);
}

.ak-media--16-9 {
  aspect-ratio: 16 / 9;
}

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

.ak-media--1-1 {
  aspect-ratio: 1 / 1;
}

.ak-media--3-2 {
  aspect-ratio: 3 / 2;
}

.ak-media--grayscale img {
  filter: grayscale(1) contrast(1.1);
}

.ak-media--grayscale:hover img {
  filter: grayscale(0.15) contrast(1.05);
}

.ak-media--line::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--ak-cyan);
  border-radius: inherit;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--ak-transition-base);
}

.ak-media--line:hover::after {
  opacity: 0.55;
}

/* 18. 面包屑 */
.ak-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  margin: 0;
  list-style: none;
  color: var(--ak-gray);
  font-size: 0.84rem;
}

.ak-breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.ak-breadcrumbs li:not(:last-child)::after {
  content: "/";
  color: var(--ak-gray);
}

.ak-breadcrumbs a {
  color: var(--ak-cyan);
}

.ak-breadcrumbs a:hover {
  color: var(--ak-red-bright);
}

/* 19. 分节 */
.ak-section {
  position: relative;
  padding: clamp(3rem, 8vw, 5.5rem) 0;
}

.ak-section--dark {
  background: var(--ak-black);
  color: var(--ak-light);
}

.ak-section--light {
  background: var(--ak-light);
  color: var(--ak-black);
}

.ak-section--light h1,
.ak-section--light h2,
.ak-section--light h3,
.ak-section--light h4 {
  color: var(--ak-black);
}

.ak-section--slash::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(68%, 640px);
  height: 3px;
  background: linear-gradient(90deg, var(--ak-red) 0%, var(--ak-red) 70%, var(--ak-cyan) 70%, var(--ak-cyan) 100%);
}

.ak-section--slash-right::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(40%, 380px);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--ak-cyan));
  opacity: 0.3;
}

/* 20. 分隔线 */
.ak-rule {
  height: 3px;
  margin: clamp(2rem, 5vw, 3rem) 0;
  border: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--ak-red) 0%, var(--ak-red) 68%, var(--ak-cyan) 68%, var(--ak-cyan) 100%);
}

/* 21. 正文容器 */
.ak-prose {
  max-width: 72ch;
}

.ak-prose p {
  margin-bottom: 1.1em;
  color: rgba(245, 245, 245, 0.85);
  line-height: 1.85;
}

.ak-prose h2 {
  margin-top: 1.8em;
}

/* 22. 滚动显现 */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ak-ease), transform 0.6s var(--ak-ease);
}

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

/* 23. 工具类 */
.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;
}

/* 24. 响应式 */
@media (max-width: 991.98px) {
  .ak-nav-toggle {
    display: inline-flex;
  }

  .ak-header__hint {
    display: none;
  }

  .ak-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    padding: 8px;
    background: rgba(26, 26, 29, 0.96);
    border: 1px solid rgba(0, 245, 212, 0.22);
    border-radius: 16px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transition: opacity 0.25s var(--ak-ease), transform 0.25s var(--ak-ease), visibility 0.25s;
  }

  .ak-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

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

  .ak-nav__link {
    display: block;
    padding: 12px 16px;
    border-radius: 10px;
    text-align: center;
  }
}

@media (max-width: 920px) {
  .ak-footer__inner {
    grid-template-columns: 1fr 1fr;
  }

  .ak-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .ak-grid--3,
  .ak-grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 580px) {
  .ak-footer__inner {
    grid-template-columns: 1fr;
  }

  .ak-footer__brand {
    grid-column: auto;
  }
}

@media (max-width: 560px) {
  .ak-grid--2,
  .ak-grid--3,
  .ak-grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .ak-brand {
    font-size: 1.3rem;
  }

  .ak-brand__icon {
    width: 30px;
    height: 30px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .ak-header__inner {
    border-radius: 16px;
  }

  .ak-btn {
    width: 100%;
  }
}

/* 25. 焦点可见 */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  border-radius: 4px;
  outline: 3px solid var(--ak-cyan);
  outline-offset: 3px;
}

a.skip-link:focus-visible {
  outline-color: var(--ak-white);
}

/* 26. 减少动效 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }

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