/* ==========================================================================
   德赢体育 DWIN SPORT — 全站共享样式 /assets/site.css
   深蓝×亮橙×金 | 速度感斜切 | 等宽索引 | 连续画布
   ========================================================================== */

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

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

body {
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #1A1A1A;
  background-color: #F9F6F0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
  list-style: none;
}

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

p {
  margin-bottom: 16px;
}

strong {
  font-weight: 700;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Source Han Sans SC", "Noto Sans SC", "Montserrat", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.25;
  color: #1A1A1A;
}

::selection {
  background: #FF6B1A;
  color: #FFFFFF;
}

:focus-visible {
  outline: 3px solid #FF6B1A;
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- CSS 变量 ---------- */
:root {
  --color-primary: #0B1D3A;
  --color-primary-deep: #060F1F;
  --color-primary-light: #2E4A7A;
  --color-accent: #FF6B1A;
  --color-accent-soft: rgba(255, 107, 26, 0.16);
  --color-gold: #F5B700;
  --color-cream: #F9F6F0;
  --color-ink: #1A1A1A;
  --color-muted: #7A8BA6;
  --color-danger: #D32F2F;
  --color-white: #FFFFFF;

  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-headline: "Source Han Sans SC", "Noto Sans SC", "Montserrat", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Consolas", "Menlo", monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --container-max: 1200px;
  --container-pad: 24px;

  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --shadow-sm: 0 2px 10px rgba(6, 15, 31, 0.08);
  --shadow-md: 0 6px 24px rgba(6, 15, 31, 0.14);
  --shadow-lg: 0 16px 48px rgba(6, 15, 31, 0.22);
}

/* ---------- 容器 ---------- */
.site-container {
  max-width: calc(var(--container-max) + var(--container-pad) * 2);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 300;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 700;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
  outline: 3px solid var(--color-gold);
  outline-offset: -3px;
}

/* ---------- 顶部阅读进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-gold) 100%);
  z-index: 220;
  pointer-events: none;
  transition: width 0.12s linear;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.header-utility {
  background: linear-gradient(90deg, var(--color-primary-deep) 0%, var(--color-primary-light) 120%);
  border-bottom: 1px solid rgba(255, 107, 26, 0.25);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.header-utility-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 36px;
  gap: var(--space-3);
}

.header-tagline {
  margin: 0;
  color: var(--color-muted);
  letter-spacing: 0.1em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-tagline::before {
  content: "/01";
  font-family: var(--font-mono);
  color: var(--color-accent);
  margin-right: 8px;
}

.header-utility-link {
  color: var(--color-gold);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.header-utility-link:hover {
  color: var(--color-accent);
}

.header-main {
  position: relative;
  background-color: var(--color-primary);
  background-image: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 28px,
    rgba(255, 107, 26, 0.025) 28px,
    rgba(255, 107, 26, 0.025) 29px
  );
}

.header-main::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-gold) 40%, transparent 95%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.header-main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: var(--space-5);
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 24px;
  line-height: 1;
  background: linear-gradient(135deg, var(--color-accent), var(--color-gold));
  color: var(--color-primary);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
  box-shadow: 2px 2px 0 rgba(245, 183, 0, 0.3);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-headline);
  font-size: 22px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--color-cream);
  display: block;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-top: 3px;
}

/* ---------- 导航（桌面） ---------- */
.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: stretch;
  gap: 2px;
  counter-reset: nav-index;
}

.nav-item {
  counter-increment: nav-index;
}

.nav-link {
  position: relative;
  display: block;
  padding: 28px 16px 24px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.3;
  color: rgba(249, 246, 240, 0.82);
  transition: color 0.2s ease;
}

.nav-link::before {
  content: counter(nav-index, decimal-leading-zero);
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: 3px;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  clip-path: polygon(6px 0, calc(100% - 2px) 0, calc(100% - 6px) 100%, 2px 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s ease;
}

.nav-link:hover {
  color: var(--color-cream);
}

.nav-link:hover::before {
  color: var(--color-accent);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-cream);
}

.nav-link[aria-current="page"]::before {
  color: var(--color-accent);
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  margin-left: auto;
  border-radius: var(--radius-sm);
  background: rgba(255, 107, 26, 0.1);
  transition: background-color 0.2s ease;
}

.nav-toggle:hover {
  background: rgba(255, 107, 26, 0.22);
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 3px;
  margin: 0 auto;
  background: var(--color-cream);
  border-radius: 3px;
  transition: transform 0.28s ease, opacity 0.2s ease, background-color 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
  background: var(--color-accent);
}

.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(-8px) rotate(-45deg);
  background: var(--color-accent);
}

/* ---------- 移动端导航状态 ---------- */
@media (max-width: 900px) {
  .site-header {
    position: sticky;
    top: 0;
  }

  .header-utility {
    display: none;
  }

  .header-main-inner {
    min-height: 60px;
    gap: var(--space-3);
    flex-wrap: wrap;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 20px;
  }

  .brand-title {
    font-size: 19px;
  }

  .brand-sub {
    font-size: 8px;
    letter-spacing: 0.18em;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary-deep);
    border-top: 1px solid rgba(245, 183, 0, 0.2);
    border-bottom: 4px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-18px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    margin-left: 0;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    font-size: 16px;
    color: var(--color-cream);
    border-left: 4px solid transparent;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  }

  .nav-link::before {
    display: inline-block;
    font-size: 11px;
    margin-bottom: 0;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover {
    background: rgba(255, 107, 26, 0.08);
  }

  .nav-link[aria-current="page"] {
    background: var(--color-accent-soft);
    border-left-color: var(--color-accent);
    color: var(--color-accent);
  }

  .nav-link[aria-current="page"]::before {
    color: var(--color-accent);
  }
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--color-primary-deep);
  color: var(--color-cream);
  margin-top: var(--space-7);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-gold) 35%, var(--color-primary-light) 100%);
  z-index: 2;
}

/* Footer CTA */
.footer-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 130%);
  padding: var(--space-5) 0;
  border-bottom: 1px solid rgba(255, 107, 26, 0.2);
}

.footer-cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer-tagline {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.06em;
  margin: 0;
  color: var(--color-cream);
}

.footer-tagline::before {
  content: "▶";
  color: var(--color-accent);
  margin-right: 10px;
  font-size: 14px;
  vertical-align: 2px;
}

.footer-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Footer 主区域 */
.footer-main {
  padding: var(--space-6) 0 var(--space-5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.9fr 1.4fr;
  gap: var(--space-6);
}

.footer-brand-col .brand {
  margin-bottom: var(--space-3);
}

.footer-brand-col .brand-title {
  font-size: 24px;
  color: var(--color-cream);
}

.footer-brand-col .brand-mark {
  width: 46px;
  height: 46px;
  font-size: 24px;
}

.footer-note {
  margin: var(--space-3) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--color-accent);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(249, 246, 240, 0.68);
  max-width: 320px;
  letter-spacing: 0.02em;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--space-3);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(249, 246, 240, 0.1);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}

.footer-list a {
  color: rgba(249, 246, 240, 0.78);
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a:hover {
  color: var(--color-accent);
  padding-left: 5px;
}

.footer-contact-list li {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(249, 246, 240, 0.78);
}

/* Footer 底栏 */
.footer-bottom {
  border-top: 1px solid rgba(249, 246, 240, 0.08);
  background: var(--color-primary-deep);
  padding: var(--space-3) 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}

.footer-bottom-inner p {
  margin: 0;
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 28px;
  z-index: 210;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 22px;
  line-height: 1;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background-color 0.2s ease;
}

.back-top:hover {
  background: #E85A0A;
}

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

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  background: none;
  color: inherit;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.2s ease, box-shadow 0.2s ease;
  text-align: center;
  white-space: nowrap;
}

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

.btn:active {
  transform: translateY(0);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(255, 107, 26, 0.35);
}

.btn-accent:hover {
  background: #E85A0A;
  box-shadow: 0 6px 20px rgba(255, 107, 26, 0.45);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-cream);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  color: var(--color-cream);
}

.btn-ghost {
  border-color: rgba(249, 246, 240, 0.42);
  color: var(--color-cream);
}

.btn-ghost:hover {
  background: rgba(249, 246, 240, 0.1);
  border-color: rgba(249, 246, 240, 0.8);
  color: var(--color-cream);
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-cream);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 17px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  padding: var(--space-3) 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  display: inline-block;
  margin: 0 10px;
  color: var(--color-accent);
}

.breadcrumb a {
  color: var(--color-primary);
  transition: color 0.2s ease;
}

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

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

/* ---------- 内容分区 ---------- */
.section {
  padding: var(--space-6) 0;
}

.section-heading {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.3;
  margin-bottom: var(--space-4);
  padding-left: 18px;
  position: relative;
  color: var(--color-ink);
}

.section-heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-gold));
  clip-path: polygon(0 0, 100% 4px, 100% calc(100% - 4px), 0 100%);
}

.section-desc {
  max-width: 620px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

/* ---------- 网格 ---------- */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-5);
}

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

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

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

@media (max-width: 1000px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

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

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-primary);
  color: var(--color-cream);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ---------- 响应式图片容器 ---------- */
.img-cover {
  position: relative;
  overflow: hidden;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
}

.img-cover > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.img-cover:hover > img {
  transform: scale(1.03);
}

.ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.ratio-1x1 {
  aspect-ratio: 1 / 1;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  padding: 5px 14px;
  background: var(--color-accent-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  clip-path: polygon(8px 0, calc(100% - 2px) 0, calc(100% - 8px) 100%, 2px 100%);
}

/* ---------- 内页专题封面（Hero） ---------- */
.page-hero {
  position: relative;
  padding: var(--space-7) 0 var(--space-6);
  background: var(--color-primary);
  color: var(--color-cream);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 16px,
    rgba(255, 107, 26, 0.05) 16px,
    rgba(255, 107, 26, 0.05) 17px
  );
  pointer-events: none;
}

.page-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 12% 100%);
}

.page-hero-title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--color-cream);
  position: relative;
  z-index: 1;
}

.page-hero-desc {
  margin: var(--space-3) 0 0;
  max-width: 560px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(249, 246, 240, 0.78);
  position: relative;
  z-index: 1;
}

/* ---------- 响应式 Footer 网格 ---------- */
@media (max-width: 1000px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .footer-cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .back-top {
    right: 16px;
    bottom: 20px;
    width: 44px;
    height: 44px;
  }
}

/* ---------- 减少动态效果 ---------- */
@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;
  }

  .scroll-progress {
    transition: none;
  }

  .img-cover > img {
    transition: none;
  }

  .card,
  .btn,
  .nav-link,
  .brand,
  .back-top {
    transition: none;
  }
}