/* ============================================================
   博悦竞技 / /assets/site.css
   全站共享层：重置、变量、排版、头部、页脚、通用组件
   ============================================================ */

/* ---------- 01 重置与变量 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-bg: #0B0F1F;
  --c-bg-deep: #060912;
  --c-bg-alt: #102A3C;
  --c-card: #151E2E;
  --c-accent: #00E5FF;
  --c-accent-2: #FF7A1A;
  --c-data: #39FF88;
  --c-text: #EAF2FF;
  --c-text-dim: #9AA8C7;
  --c-line: #26364A;
  --c-glow: rgba(0, 229, 255, 0.25);

  --f-headline: 'Impact', 'Arial Black', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --f-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-mono: 'JetBrains Mono', 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;

  --text-base: 16px;
  --text-h1: clamp(2.5rem, 6vw, 5rem);
  --text-h2: clamp(1.75rem, 4vw, 2.75rem);
  --text-h3: clamp(1.25rem, 2.4vw, 1.75rem);

  --container: 1200px;
  --gutter: 24px;
  --space-section: clamp(4rem, 10vw, 7rem);
  --header-top-space: 92px;
  --radius: 0;
  --tr: 0.3s ease-out;
  --z-header: 100;
  --z-progress: 200;
  --z-skip: 1000;
}

/* ---------- 02 基础元素 ---------- */
html {
  font-size: var(--text-base);
  scroll-behavior: smooth;
  scrollbar-color: var(--c-accent) var(--c-bg-deep);
}

body {
  font-family: var(--f-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text);
  background:
    radial-gradient(900px 480px at 85% -8%, rgba(16, 42, 60, 0.55), transparent 65%),
    var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--header-top-space);
  min-height: 100vh;
}

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

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color var(--tr);
}

a:hover {
  color: var(--c-text);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--f-headline);
  font-style: italic;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--c-text);
}

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

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

#main-content:focus {
  outline: none;
}

::selection {
  background: var(--c-accent);
  color: var(--c-bg);
}

[hidden] {
  display: none !important;
}

/* ---------- 03 布局与工具 ---------- */
.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

.main-content,
#main-content {
  min-height: 65vh;
}

.section {
  padding: var(--space-section) 0;
  position: relative;
}

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

.section__header {
  margin-bottom: 2rem;
}

.section__index {
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.24em;
  color: var(--c-accent);
  text-transform: uppercase;
}

.section__title {
  font-size: var(--text-h2);
  margin-top: 0.5rem;
}

.section__lead {
  color: var(--c-text-dim);
  max-width: 56rem;
  margin-top: 0.75rem;
}

.page-header {
  padding: 2rem 0 3rem;
}

.page-header__title {
  font-size: var(--text-h1);
}

.page-header__intro {
  font-size: 1.125rem;
  color: var(--c-text-dim);
  max-width: 42rem;
  margin-top: 1rem;
}

.lead {
  font-size: 1.125rem;
  color: var(--c-text-dim);
  margin-bottom: 2em;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

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

/* ---------- 04 辅助与进度条 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-skip);
  padding: 0.75rem 1.5rem;
  background: var(--c-accent);
  color: var(--c-bg);
  font-family: var(--f-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transform: translateY(-120%);
  transition: transform var(--tr);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: var(--z-progress);
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-data) 50%, var(--c-accent-2) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 05 头部与导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  pointer-events: none;
}

.nav-capsule {
  pointer-events: auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: calc(100% - 24px);
  max-width: calc(var(--container) + 48px);
  margin: 12px auto 0;
  padding: 8px 8px 8px 16px;
  background: rgba(11, 15, 31, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  transition: border-color var(--tr), box-shadow var(--tr);
}

.nav-capsule:hover {
  border-color: rgba(0, 229, 255, 0.35);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--c-text);
}

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

.brand__mark {
  position: relative;
  width: 34px;
  height: 30px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.3));
}

.brand__mark::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--c-accent);
  clip-path: polygon(0 0, 100% 0, 55% 100%, 0 100%);
}

.brand__mark::after {
  content: '';
  position: absolute;
  top: 16%;
  right: -6%;
  width: 58%;
  height: 42%;
  background: var(--c-accent-2);
  clip-path: polygon(100% 0, 100% 100%, 18% 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--f-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--c-text);
}

.brand__tagline {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
}

.nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list__item {
  flex-shrink: 0;
}

.nav-list__link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-text-dim);
  border-radius: 999px;
  white-space: nowrap;
  position: relative;
  transition: color var(--tr), background var(--tr);
}

.nav-list__link:hover {
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.05);
}

.nav-list__link[aria-current="page"] {
  color: var(--c-accent);
  background: rgba(0, 229, 255, 0.1);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.625rem;
  height: 40px;
  padding: 0 0.875rem;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-text);
  transition: border-color var(--tr), color var(--tr);
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.nav-toggle__lines {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
  justify-content: center;
}

.nav-toggle__line {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--tr), opacity var(--tr);
}

.nav-toggle__text {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---------- 06 页脚 ---------- */
.site-footer {
  position: relative;
  background:
    linear-gradient(rgba(38, 54, 74, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(38, 54, 74, 0.16) 1px, transparent 1px),
    var(--c-bg-deep);
  background-size: 32px 32px;
  border-top: 1px solid var(--c-line);
  margin-top: calc(var(--space-section) * 0.5);
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-data) 55%, var(--c-accent-2) 100%);
  z-index: 1;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 3rem;
  padding: 3.5rem 0 2.5rem;
}

.footer-brand__desc {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--c-text-dim);
  max-width: 280px;
}

.brand--footer .brand__name {
  font-size: 1.4rem;
}

.footer-pages__title,
.footer-contact__title {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 400;
  font-style: normal;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  margin-bottom: 1rem;
}

.footer-pages__list li + li,
.footer-contact__list li + li {
  margin-top: 0.625rem;
}

.footer-pages__list a,
.footer-contact__list a {
  display: inline-block;
  color: var(--c-text-dim);
  font-size: 0.875rem;
  transition: color var(--tr), padding-left var(--tr);
}

.footer-pages__list a:hover,
.footer-contact__list a:hover {
  color: var(--c-accent);
  padding-left: 4px;
}

.footer-contact__list {
  font-size: 0.875rem;
  color: var(--c-text-dim);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-text-dim);
}

.footer-bottom__note {
  color: var(--c-text-dim);
  font-family: var(--f-body);
  font-size: 0.75rem;
}

/* ---------- 07 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-family: var(--f-body);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
  background: transparent;
  text-decoration: none;
  position: relative;
  transition: color var(--tr), background var(--tr), border-color var(--tr);
}

.btn--primary {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
}

.btn--primary:hover {
  background: transparent;
  color: var(--c-accent);
}

.btn--secondary {
  border-color: var(--c-accent-2);
  color: var(--c-accent-2);
}

.btn--secondary:hover {
  background: var(--c-accent-2);
  color: var(--c-bg);
}

.btn--ghost {
  border-color: var(--c-line);
  color: var(--c-text-dim);
}

.btn--ghost:hover {
  border-color: var(--c-text-dim);
  color: var(--c-text);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--c-text-dim);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--c-line);
}

.breadcrumb a {
  color: var(--c-text-dim);
}

.breadcrumb a:hover {
  color: var(--c-accent);
}

.breadcrumb__sep {
  color: var(--c-line);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-text);
}

.card {
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--tr), transform var(--tr), box-shadow var(--tr);
}

.card:hover {
  border-color: rgba(0, 229, 255, 0.4);
  transform: translateY(-2px);
}

.card--data {
  border-top: 2px solid var(--c-accent);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.06);
}

.card--data:hover {
  box-shadow: 0 0 32px var(--c-glow);
}

.card__title {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  margin-bottom: 0.625rem;
  font-style: normal;
  font-weight: 400;
}

.card__value {
  font-family: var(--f-mono);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1;
  color: var(--c-data);
  letter-spacing: -0.02em;
}

.card__meta {
  font-size: 0.8125rem;
  color: var(--c-text-dim);
  margin-top: 0.75rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.875rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-accent);
  border: 1px solid rgba(0, 229, 255, 0.35);
  background: rgba(0, 229, 255, 0.06);
}

.tag--hot {
  color: var(--c-accent-2);
  border-color: rgba(255, 122, 26, 0.4);
  background: rgba(255, 122, 26, 0.08);
}

.tag--ok {
  color: var(--c-data);
  border-color: rgba(57, 255, 136, 0.35);
  background: rgba(57, 255, 136, 0.07);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--f-mono);
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
}

.data-table th {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}

.data-table td {
  color: var(--c-text);
}

.prose p {
  margin-bottom: 1.5em;
  color: var(--c-text-dim);
}

.prose strong {
  color: var(--c-text);
}

.prose h2 {
  font-size: var(--text-h3);
  margin: 2em 0 0.75em;
}

/* ---------- 08 图像容器 ---------- */
.img-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--c-bg-alt), var(--c-card));
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.img-frame--wide {
  aspect-ratio: 16 / 9;
}

.img-frame--portrait {
  aspect-ratio: 3 / 4;
}

.img-frame--hero {
  aspect-ratio: 21 / 9;
}

.img-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.35;
  z-index: 3;
  pointer-events: none;
}

.img-frame::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle at top right, var(--c-glow), transparent 70%);
  z-index: 2;
  pointer-events: none;
}

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

.img-frame--overlay::after {
  inset: auto 0 0 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, transparent 45%, rgba(11, 15, 31, 0.82));
}

.media-caption {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-text-dim);
  margin-top: 0.5rem;
}

/* ---------- 09 响应式 ---------- */
@media (max-width: 900px) {
  .nav-capsule {
    border-radius: 18px;
    padding: 8px 8px 8px 14px;
  }

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

  .nav {
    flex: initial;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    background: rgba(13, 18, 33, 0.98);
    border: 1px solid var(--c-line);
    border-radius: 16px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transform: translateY(-6px);
    transition: max-height 0.35s ease-out, opacity 0.35s ease-out, transform 0.35s ease-out;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  }

  .nav[data-open] {
    max-height: 420px;
    opacity: 1;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px;
  }

  .nav-list__link {
    display: flex;
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    border-radius: 10px;
  }

  .nav-list__link[aria-current="page"] {
    background: rgba(0, 229, 255, 0.12);
  }

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 600px) {
  :root {
    --gutter: 16px;
    --header-top-space: 84px;
  }

  .nav-capsule {
    width: calc(100% - 16px);
    margin-top: 8px;
  }

  .brand__tagline {
    display: none;
  }

  .brand__name {
    font-size: 1.05rem;
  }

  .nav-toggle {
    padding: 0 0.625rem;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .breadcrumb {
    font-size: 0.75rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- 10 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .nav,
  .nav-toggle__line,
  .skip-link {
    transition: none;
  }
}