/* ============================================
   加加体育 — 全站共享样式 /assets/site.css
   ============================================ */

/* ---------- Reset & Variables ---------- */

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

:root {
  --color-primary: #FF3B30;
  --color-deep-space: #0A1E3F;
  --color-night-blue: #1A3260;
  --color-green: #00FF94;
  --color-white: #FFFFFF;
  --color-gray: #B0BEC5;
  --color-border-red: #FF5A5F;
  --color-cream: #F5F0E6;
  --color-dark: #1A1A1A;

  --font-title: 'Anton', 'Archivo Black', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --h1-size: clamp(2.5rem, 6vw, 5rem);
  --h2-size: clamp(1.8rem, 3vw, 3rem);
  --body-size: 1rem;

  --shadow-red: 4px 4px 0 0 rgba(255, 59, 48, 0.35);
  --shadow-dark: 4px 4px 0 0 rgba(0, 0, 0, 0.25);
  --shadow-green: 0 0 16px rgba(0, 255, 148, 0.3);

  --header-height: 72px;
  --radius: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + 12px);
}

body {
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: 1.75;
  color: var(--color-white);
  background-color: var(--color-deep-space);
  background-image:
    linear-gradient(rgba(0, 255, 148, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 148, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  min-height: 100vh;
  overflow-x: hidden;
}

img,
picture,
video,
canvas {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-green);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-white);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 700;
  line-height: 1.15;
  text-transform: uppercase;
  color: var(--color-white);
}

h1 {
  font-size: var(--h1-size);
  letter-spacing: -0.01em;
}

h2 {
  font-size: var(--h2-size);
}

h3 {
  font-size: 1.125rem;
}

h4 {
  font-size: 0.9375rem;
}

:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
  border-radius: 0;
}

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

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-deep-space);
}

::-webkit-scrollbar-thumb {
  background: var(--color-night-blue);
  border: 2px solid var(--color-deep-space);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ---------- Container ---------- */

.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding-inline: 2rem;
  }
}

/* ---------- Section ---------- */

.section {
  padding-block: clamp(4rem, 8vw, 6.5rem);
  position: relative;
}

.section + .section {
  border-top: 1px solid rgba(176, 190, 197, 0.12);
}

.section--alt {
  background: var(--color-night-blue);
  border-top: 3px solid var(--color-border-red);
  border-bottom: 3px solid var(--color-border-red);
  background-image:
    linear-gradient(rgba(0, 255, 148, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 148, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}

.section__header {
  max-width: 46rem;
  margin-bottom: 2.5rem;
}

.section__tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  background: rgba(255, 59, 48, 0.08);
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.875rem;
}

.section__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.125rem;
  height: 2.125rem;
  padding-inline: 0.375rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-white);
  box-shadow: var(--shadow-dark);
  margin-right: 0.5rem;
}

.section__title {
  margin-bottom: 0.875rem;
  color: var(--color-white);
}

.section__lead {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-gray);
  max-width: 38rem;
}

@media (prefers-reduced-motion: no-preference) {
  .section__number {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }

  .section__number:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 0 rgba(0, 0, 0, 0.35);
  }
}

/* ---------- Grid ---------- */

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

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

@media (min-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.375rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 2px solid var(--color-white);
  border-radius: var(--radius);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-border-red);
  border-color: var(--color-border-red);
  color: var(--color-white);
  box-shadow: var(--shadow-dark);
  transform: translate(-2px, -2px);
}

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

.btn--ghost:hover {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-dark);
  transform: translate(-2px, -2px);
}

.btn--sm {
  padding: 0.4375rem 0.875rem;
  font-size: 0.75rem;
}

/* ---------- Tags ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 1px solid var(--color-gray);
  color: var(--color-gray);
  position: relative;
}

.tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-gray);
  flex-shrink: 0;
}

.tag--red {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tag--red::before {
  background: var(--color-primary);
}

.tag--green {
  border-color: var(--color-green);
  color: var(--color-green);
}

.tag--green::before {
  background: var(--color-green);
  box-shadow: var(--shadow-green);
}

/* ---------- Cards ---------- */

.card {
  position: relative;
  background: var(--color-night-blue);
  border: 2px solid rgba(255, 255, 255, 0.14);
  border-left: 4px solid var(--color-primary);
  padding: 1.5rem;
  box-shadow: var(--shadow-dark);
  border-radius: var(--radius);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-left-color: var(--color-green);
  background: #1d3a70;
}

.card--data {
  background: var(--color-deep-space);
  border-left-color: var(--color-green);
  border-top: 1px solid rgba(0, 255, 148, 0.35);
}

.card--data::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 2.5rem 2.5rem;
  border-color: transparent transparent var(--color-primary) transparent;
}

.card__title {
  font-size: 1.125rem;
  margin-bottom: 0.625rem;
  color: var(--color-white);
}

.card__body {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-gray);
  flex: 1;
}

/* ---------- Data Number ---------- */

.data-number {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-green);
  text-shadow: var(--shadow-green);
  letter-spacing: -0.02em;
  display: inline-block;
}

.data-label {
  display: block;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-gray);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-top: 0.375rem;
}

/* ---------- Breadcrumb ---------- */

.breadcrumb {
  padding: 0.875rem 0;
  margin-bottom: 2rem;
  border-bottom: 1px solid rgba(176, 190, 197, 0.18);
  overflow-x: auto;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  min-width: max-content;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--color-gray);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: '/';
  color: rgba(176, 190, 197, 0.5);
}

.breadcrumb__link {
  color: var(--color-gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb__link:hover {
  color: var(--color-green);
}

.breadcrumb__current {
  color: var(--color-white);
}

/* ---------- Page Hero ---------- */

.page-hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 0;
  background: var(--color-deep-space);
  border-bottom: 3px solid var(--color-primary);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, transparent 55%, rgba(255, 59, 48, 0.14) 55%, rgba(255, 59, 48, 0.14) 100%);
  pointer-events: none;
}

.page-hero__inner {
  position: relative;
  z-index: 1;
}

.page-hero__tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-green);
  padding: 0.25rem 0.75rem;
  border: 1px solid rgba(0, 255, 148, 0.5);
  background: rgba(0, 255, 148, 0.08);
  display: inline-block;
  margin-bottom: 1.25rem;
}

.page-hero__title {
  max-width: 14em;
  margin-bottom: 1.25rem;
}

.page-hero__lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-gray);
  max-width: 42rem;
  margin-bottom: 2rem;
}

.page-hero__meta {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--color-primary);
  background: rgba(26, 50, 96, 0.5);
  max-width: 26rem;
}

.page-hero__meta-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-gray);
}

.page-hero__meta-item span {
  color: var(--color-green);
  font-weight: 700;
}

/* ---------- Visual Placeholder ---------- */

.visual-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  overflow: hidden;
  background-color: var(--color-night-blue);
  background-image:
    linear-gradient(rgba(0, 255, 148, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 148, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 3px solid var(--color-primary);
}

.visual-placeholder::before {
  content: 'IMG';
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--color-gray);
  background: rgba(10, 30, 63, 0.75);
  padding: 0.5rem 0.875rem;
  border: 1px solid rgba(176, 190, 197, 0.5);
  text-transform: uppercase;
}

.visual-placeholder[data-ratio="16/9"] {
  aspect-ratio: 16 / 9;
}

.visual-placeholder[data-ratio="4/3"] {
  aspect-ratio: 4 / 3;
}

.visual-placeholder[data-ratio="1/1"] {
  aspect-ratio: 1 / 1;
}

.visual-placeholder[data-ratio="21/9"] {
  aspect-ratio: 21 / 9;
}

/* ---------- Skip Link ---------- */

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  padding: 0.75rem 1.5rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8125rem;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
  border: 2px solid var(--color-white);
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline: none;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-deep-space);
  border-bottom: 3px solid var(--color-primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-green) 50%, transparent 100%);
  opacity: 0.7;
  pointer-events: none;
}

.progress-bar {
  position: absolute;
  top: -3px;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-green));
  z-index: 10;
  transition: width 0.08s linear;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
  position: relative;
}

/* Brand */
.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-white);
  flex-shrink: 0;
}

.site-header__brand:hover {
  color: var(--color-white);
}

.site-header__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-title);
  font-style: italic;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  border: 2px solid var(--color-white);
  box-shadow: 0 0 14px rgba(255, 59, 48, 0.55);
  border-radius: var(--radius);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.site-header__brand-name {
  font-family: var(--font-title);
  font-style: italic;
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-white);
}

.site-header__brand-sub {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-gray);
}

.site-header__brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.1875rem 0.5rem;
  background: rgba(0, 255, 148, 0.12);
  border: 1px solid rgba(0, 255, 148, 0.4);
  color: var(--color-green);
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  line-height: 1;
}

.site-header__brand-dot {
  width: 6px;
  height: 6px;
  background: var(--color-green);
  border-radius: 50%;
  animation: live-pulse 1.6s ease-out infinite;
}

@media (max-width: 480px) {
  .site-header__brand-sub,
  .site-header__brand-badge {
    display: none;
  }
}

/* Nav (desktop) */
.site-header__nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-header__nav-item {
  position: relative;
}

.site-header__nav-link {
  display: block;
  padding: 0.5rem 0.6875rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-header__nav-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.site-header__nav-link[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.site-header__cta {
  margin-left: 0.25rem;
}

/* Toggle (mobile hamburger) */
.site-header__toggle {
  display: none;
  position: relative;
  z-index: 20;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.04);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius);
  padding: 0.5rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.site-header__toggle:hover {
  border-color: var(--color-primary);
  background: rgba(255, 59, 48, 0.08);
}

.site-header__toggle.is-active {
  border-color: var(--color-primary);
}

.site-header__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  margin: 4px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Nav */
@media (max-width: 920px) {
  .site-header__toggle {
    display: block;
  }

  .site-header__nav {
    position: absolute;
    top: calc(100% + 3px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-deep-space);
    border-bottom: 3px solid var(--color-primary);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity 0.25s ease, max-height 0.35s ease, transform 0.25s ease, visibility 0.25s ease;
  }

  .site-header__nav[data-open="true"] {
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    gap: 0;
    width: 100%;
    padding: 0.5rem 1.25rem;
  }

  .site-header__nav-item {
    width: 100%;
  }

  .site-header__nav-link {
    display: block;
    padding: 0.75rem 0.5rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-left: 3px solid transparent;
  }

  .site-header__nav-link:hover {
    border-left-color: var(--color-primary);
    border-bottom-color: rgba(255, 255, 255, 0.08);
  }

  .site-header__nav-link[aria-current="page"] {
    border-left-color: var(--color-primary);
    border-bottom-color: rgba(255, 255, 255, 0.08);
  }

  .site-header__cta {
    margin: 1rem 1.25rem 1.5rem;
    width: calc(100% - 2.5rem);
  }
}

/* ---------- Footer ---------- */

.site-footer {
  position: relative;
  background-color: var(--color-deep-space);
  background-image:
    linear-gradient(rgba(0, 255, 148, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 148, 0.04) 1px, transparent 1px);
  background-size: 100% 42px, 42px 100%;
  border-top: 4px solid var(--color-primary);
  margin-top: auto;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-block: clamp(3rem, 6vw, 4.5rem) 2.5rem;
}

@media (min-width: 768px) {
  .site-footer__top {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 2rem;
  }
}

@media (min-width: 1024px) {
  .site-footer__top {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 1rem;
}

.site-footer__brand:hover {
  color: var(--color-white);
}

.site-footer__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 700;
  font-size: 1.25rem;
  border: 2px solid var(--color-white);
  box-shadow: var(--shadow-red);
}

.site-footer__brand-name {
  font-family: var(--font-title);
  font-style: italic;
  font-size: 1.375rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-white);
  letter-spacing: 0.06em;
}

.site-footer__about {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color-gray);
  max-width: 28rem;
  margin-bottom: 0.875rem;
}

.site-footer__trust {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-gray);
  border-left: 2px solid var(--color-green);
  padding-left: 0.75rem;
  opacity: 0.85;
  line-height: 1.65;
}

.site-footer__heading {
  font-family: var(--font-title);
  font-size: 0.8125rem;
  font-style: italic;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-white);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(255, 255, 255, 0.15);
}

.site-footer__contact-list,
.site-footer__links-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.site-footer__contact-item {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.375rem;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray);
  padding-top: 0.125rem;
}

.site-footer__contact-text {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.5;
}

.site-footer__link {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
  border-bottom: 1px solid transparent;
  display: inline-block;
}

.site-footer__link:hover {
  color: var(--color-green);
  border-bottom-color: var(--color-green);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-block: 1.25rem;
  border-top: 1px solid rgba(176, 190, 197, 0.2);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-gray);
}

.site-footer__copyright {
  color: var(--color-gray);
}

.site-footer__icp {
  color: var(--color-gray);
}

/* ---------- Back Top ---------- */

.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.625rem 0.75rem;
  background: var(--color-primary);
  color: var(--color-white);
  border: 2px solid var(--color-white);
  box-shadow: var(--shadow-red);
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
  border-radius: var(--radius);
}

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

.back-top:hover {
  background: var(--color-border-red);
  color: var(--color-white);
}

.back-top__arrow {
  font-size: 1.125rem;
  line-height: 1;
  font-family: var(--font-mono);
}

.back-top__label {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.2em;
  line-height: 1;
  text-transform: uppercase;
}

/* ---------- Reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.65s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Live Pulse Keyframe ---------- */

@keyframes live-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(0, 255, 148, 0.6);
    opacity: 1;
  }

  50% {
    box-shadow: 0 0 0 6px rgba(0, 255, 148, 0);
    opacity: 0.75;
  }
}

/* ---------- Responsive Adjustments ---------- */

@media (max-width: 640px) {
  :root {
    --header-height: 64px;
  }

  .site-header__brand-mark {
    width: 38px;
    height: 38px;
    font-size: 1.125rem;
  }

  .site-header__brand-name {
    font-size: 1.0625rem;
  }

  .card {
    padding: 1.125rem;
  }

  .back-top {
    right: 1rem;
    bottom: 1rem;
  }

  .page-hero__meta {
    max-width: 100%;
  }
}

/* ---------- Reduced Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-padding-top: var(--header-height);
  }

  *,
  *::before,
  *::after {
    animation-duration: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0s !important;
  }

  .site-header__brand-dot {
    animation: none;
    box-shadow: none;
  }

  .btn--primary:hover,
  .btn--ghost:hover,
  .card:hover {
    transform: none;
    box-shadow: var(--shadow-dark);
  }
}