/* ==========================================================================
   易倍体育APP — 全站共享样式 /assets/site.css
   设计母题：速度 × 中原 / Speed × Heritage
   ========================================================================== */

/* ---------- 1. Reset ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) - 0.5rem);
}

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
ul,
ol,
dl,
dd,
figure,
blockquote,
pre {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

::selection {
  background: var(--c-primary);
  color: var(--c-white);
}

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

/* ---------- 2. Design Tokens ---------- */

:root {
  --c-primary: #FF6B00;
  --c-primary-deep: #D85C00;
  --c-primary-soft: #FFA500;
  --c-dark: #0A192F;
  --c-dark-2: #0D2040;
  --c-electric: #39FF14;
  --c-ink: #1A1D21;
  --c-silver: #F5F7FA;
  --c-muted: #8899AA;
  --c-white: #FFFFFF;
  --c-soft: #FFE0CC;

  --font-head: "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Noto Sans SC", Arial, sans-serif;
  --font-num: "DIN Alternate", "Roboto Mono", monospace;

  --container: 1200px;
  --radius: 2px;
  --radius-pill: 999px;
  --header-h: 5.5rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 2rem;
  --space-4: 4rem;
  --space-5: 7rem;
}

/* ---------- 3. Base Typography ---------- */

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-ink);
  background-color: var(--c-silver);
  padding-top: var(--header-h);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  color: var(--c-ink);
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 6rem);
  font-weight: 900;
}

h2 {
  font-size: clamp(1.875rem, 3.8vw, 3.25rem);
  font-weight: 900;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 800;
}

h4 {
  font-size: 1.1rem;
  font-weight: 700;
}

p {
  text-wrap: pretty;
}

strong {
  font-weight: 700;
}

.lead {
  font-size: 1.125rem;
  line-height: 1.8;
}

.t-numeric {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.t-muted {
  color: var(--c-muted);
}

/* ---------- 4. Layout Primitives ---------- */

.container {
  width: min(100%, var(--container));
  margin-inline: auto;
  padding-inline: var(--space-2);
}

.section {
  padding-block: clamp(3.5rem, 9vw, 7rem);
}

.section__inner {
  width: min(100%, var(--container));
  margin-inline: auto;
  padding-inline: var(--space-2);
}

.section--dark {
  background: var(--c-dark);
  color: rgba(255, 255, 255, 0.78);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--c-white);
}

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

.section--orange {
  background: var(--c-primary);
  color: var(--c-white);
}

.section--orange h1,
.section--orange h2,
.section--orange h3,
.section--orange h4 {
  color: var(--c-white);
}

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

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-primary);
}

.section-kicker::before {
  content: "";
  width: 2rem;
  height: 3px;
  background: var(--c-primary);
}

.section-number {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(4rem, 9vw, 7rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 2px var(--c-primary);
  user-select: none;
}

.section--dark .section-number,
.section--orange .section-number {
  -webkit-text-stroke-color: rgba(255, 255, 255, 0.28);
}

.speed-line {
  display: block;
  height: 4px;
  border: 0;
  background: linear-gradient(115deg, var(--c-primary) 0 20%, transparent 20% 28%, var(--c-primary-soft) 28% 50%, transparent 50% 58%, var(--c-primary) 58% 82%, transparent 82%);
}

/* ---------- 5. Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

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

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

.btn--primary {
  background: var(--c-primary);
  color: var(--c-white);
  box-shadow: 0 8px 20px rgba(255, 107, 0, 0.25);
}

.btn--primary:hover {
  background: var(--c-primary-deep);
}

.btn--outline {
  background: transparent;
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.4);
}

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

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

.btn--ghost:hover {
  background: rgba(255, 107, 0, 0.08);
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- 6. Tags & Indicators ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-ink);
  background: var(--c-white);
  border: 1px solid rgba(10, 25, 47, 0.12);
}

.tag--orange {
  background: var(--c-primary);
  border-color: transparent;
  color: var(--c-white);
}

.tag--green {
  color: var(--c-electric);
  background: rgba(57, 255, 20, 0.1);
  border-color: transparent;
}

.live-dot {
  display: inline-block;
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--c-electric);
  animation: live-pulse 1.8s infinite;
}

@keyframes live-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.55);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(57, 255, 20, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0);
  }
}

/* ---------- 7. Cards, Media, Grid, Breadcrumbs ---------- */

.card {
  background: var(--c-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(10, 25, 47, 0.08);
  box-shadow: 0 6px 24px rgba(10, 25, 47, 0.04);
}

.card--dark {
  background: var(--c-dark-2);
  color: rgba(255, 255, 255, 0.78);
  border-color: transparent;
}

.card--dark .card__title {
  color: var(--c-white);
}

.card__body {
  padding: var(--space-3);
}

.card__title {
  margin-bottom: 0.5rem;
}

.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--c-dark-2), var(--c-dark));
}

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

.media--ratio-3x2 {
  aspect-ratio: 3 / 2;
}

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

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.08) 50%, transparent 70%);
  pointer-events: none;
}

.grid {
  display: grid;
  gap: var(--space-3);
}

.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));
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: var(--space-3);
  font-size: 0.85rem;
  color: var(--c-muted);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumbs__item:not(:last-child)::after {
  content: "→";
  color: var(--c-muted);
  opacity: 0.6;
}

.breadcrumbs__link {
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

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

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

/* ---------- 8. Header ---------- */

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 3000;
  padding: 0.6rem 1.2rem;
  background: var(--c-primary);
  color: var(--c-white);
  font-weight: 700;
  border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(255, 107, 0, 0.4);
  text-decoration: none;
  transform: translateY(-320%);
  transition: transform 0.25s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 3px solid var(--c-electric);
  outline-offset: 2px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem;
  transition: padding 0.3s var(--ease);
}

.site-header[data-scrolled="true"] {
  padding-block: 0.5rem;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 3.5rem;
  max-width: 1120px;
  margin-inline: auto;
  padding: 0.25rem 0.5rem 0.25rem 1rem;
  background: var(--c-dark);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 32px rgba(10, 25, 47, 0.38);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header[data-scrolled="true"] .site-header__inner {
  background: rgba(10, 25, 47, 0.92);
  box-shadow: 0 8px 24px rgba(10, 25, 47, 0.28);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--c-white);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  flex: none;
}

.brand__mark svg {
  width: 100%;
  height: 100%;
}

.brand__text {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.01em;
}

.brand__text small {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  line-height: 1;
  color: var(--c-electric);
  text-transform: uppercase;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.main-nav__link {
  display: block;
  padding: 0.55rem 0.85rem;
  color: rgba(255, 255, 255, 0.8);
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-pill);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.main-nav__link:hover {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.08);
}

.main-nav__link[aria-current="page"] {
  color: var(--c-white);
  background: var(--c-primary);
  box-shadow: 0 6px 16px rgba(255, 107, 0, 0.35);
}

.nav-toggle {
  display: none;
  position: relative;
  width: 2.75rem;
  height: 2.75rem;
  margin-right: 0.25rem;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--c-white);
}

.nav-toggle__line {
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  top: 50%;
  height: 2px;
  background: currentColor;
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

.nav-toggle__line:nth-child(1) {
  transform: translateY(-0.45rem);
}

.nav-toggle__line:nth-child(2) {
  transform: translateY(0);
}

.nav-toggle__line:nth-child(3) {
  transform: translateY(0.45rem);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(0) 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(0) rotate(-45deg);
}

/* ---------- 9. Footer ---------- */

.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--c-dark);
  color: rgba(255, 255, 255, 0.72);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(255, 107, 0, 0.045) 100%);
  pointer-events: none;
  z-index: 0;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-5) var(--space-2) 6rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: center;
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--c-white);
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  flex: none;
}

.footer-brand__mark svg {
  width: 100%;
  height: 100%;
}

.footer-brand__text {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1;
}

.footer-brand__text small {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  line-height: 1;
  color: var(--c-electric);
  text-transform: uppercase;
}

.footer-trust {
  max-width: 54ch;
  margin-top: 0.75rem;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-watermark {
  font-family: var(--font-num);
  font-weight: 900;
  font-size: clamp(4rem, 10vw, 8rem);
  line-height: 1;
  letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(255, 255, 255, 0.18);
  user-select: none;
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 1.2fr;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-col__title {
  position: relative;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-primary);
}

.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2rem;
  height: 3px;
  background: var(--c-primary);
}

.footer-links li + li {
  margin-top: 0.4rem;
}

.footer-links a {
  display: inline-block;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-links a:hover {
  color: var(--c-primary-soft);
  transform: translateX(4px);
}

.footer-col--contact {
  background: rgba(255, 107, 0, 0.06);
  border-left: 3px solid var(--c-primary);
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
}

.footer-contact__item {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.35rem 0;
  font-size: 0.95rem;
}

.footer-contact__label {
  flex: none;
  width: 2.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.footer-contact__value {
  color: rgba(255, 255, 255, 0.88);
}

.footer-service-note {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--c-muted);
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  color: var(--c-muted);
}

.footer-bottom a {
  color: inherit;
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--c-white);
}

.footer-decor {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 180px;
  z-index: 0;
  pointer-events: none;
}

.footer-decor svg {
  width: 100%;
  height: 100%;
}

.top-button {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 900;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  background: var(--c-primary);
  color: var(--c-white);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(255, 107, 0, 0.35);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), background-color 0.2s var(--ease);
}

.top-button[data-visible="true"] {
  opacity: 1;
  transform: translateY(0);
}

.top-button:hover {
  background: var(--c-primary-deep);
}

.top-button svg {
  width: 1.25rem;
  height: 1.25rem;
}

.top-button path {
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
}

/* ---------- 10. Scroll Reveal ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--reveal-delay, 0s);
}

[data-reveal="left"] {
  transform: translateX(-30px);
}

[data-reveal="right"] {
  transform: translateX(30px);
}

[data-reveal="zoom"] {
  transform: scale(0.95);
}

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

/* ---------- 11. Responsive ---------- */

@media (max-width: 960px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: calc(100% + 0.6rem);
    left: 0;
    right: 0;
    padding: 0.5rem;
    background: var(--c-dark);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 16px 40px rgba(10, 25, 47, 0.45);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.5rem);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .main-nav[data-open="true"] {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
  }

  .main-nav__link {
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    text-align: center;
    font-size: 0.95rem;
  }

  .main-nav__link[aria-current="page"] {
    box-shadow: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-col--contact {
    grid-column: 1 / -1;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-watermark {
    display: none;
  }
}

@media (max-width: 640px) {
  :root {
    --header-h: 5rem;
  }

  .site-header {
    padding: 0.75rem;
  }

  .site-header[data-scrolled="true"] {
    padding-block: 0.45rem;
  }

  .brand__text small {
    letter-spacing: 0.18em;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  .top-button {
    right: 1rem;
    bottom: 1rem;
    width: 2.75rem;
    height: 2.75rem;
  }
}

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

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

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

/* ---------- 12. 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;
  }

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

  .live-dot {
    box-shadow: none;
  }
}