:root {
  --bg: #0f1312;
  --panel: #171c1b;
  --panel-strong: #202725;
  --line: #2b3432;
  --text: #e0e5e2;
  --muted: #8e9996;
  --accent: #ff624d;
  --accent-dark: #b51f12;
  --accent-cool: #1fb6d5;
  --content: min(1530px, calc(100vw - 48px));
  --ease-apple: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-apple-soft: cubic-bezier(0.16, 1, 0.3, 1);
  --motion-fast: 280ms;
  --motion-med: 620ms;
  --motion-slow: 980ms;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 19, 19, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: background-color var(--motion-med) var(--ease-apple), border-color var(--motion-med) var(--ease-apple);
}

.header-inner {
  width: var(--content);
  min-height: 96px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr minmax(260px, 360px) auto;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 240px;
  transition: transform var(--motion-med) var(--ease-apple);
}

.brand-mark {
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, #ff7b55, #d72514);
  color: white;
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 10px 24px rgba(255, 60, 48, 0.18);
  transition: transform var(--motion-med) var(--ease-apple), box-shadow var(--motion-med) var(--ease-apple);
}

.brand-name {
  color: #a5adab;
  font-size: 23px;
  font-weight: 900;
  transition: color var(--motion-med) var(--ease-apple);
}

.brand:hover {
  transform: translate3d(0, -1px, 0);
}

.brand:hover .brand-mark {
  transform: scale(1.045);
  box-shadow: 0 16px 36px rgba(255, 60, 48, 0.28);
}

.brand:hover .brand-name {
  color: #8c9393;
}

.menu-toggle {
  display: none;
  transition: transform var(--motion-med) var(--ease-apple), background-color var(--motion-med) var(--ease-apple), color var(--motion-med) var(--ease-apple);
}

.main-nav {
  display: flex;
  align-items: stretch;
  justify-content: flex-start;
  gap: 24px;
  height: 96px;
  overflow: hidden;
}

.main-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: #9b9f9f;
  font-size: 17px;
  font-weight: 700;
  white-space: nowrap;
  transition: color var(--motion-fast) var(--ease-apple), transform var(--motion-fast) var(--ease-apple);
}

.main-nav a:hover,
.main-nav a.active {
  color: #ff5a46;
}

.main-nav a:hover {
  transform: translate3d(0, -1px, 0);
}

.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--accent-dark);
  transform-origin: left center;
  animation: navLineIn 520ms var(--ease-apple);
}

.search {
  display: grid;
  grid-template-columns: 1fr 48px;
  height: 44px;
  box-shadow: 0 0 0 1px transparent;
  transition: transform var(--motion-med) var(--ease-apple), box-shadow var(--motion-med) var(--ease-apple);
}

.search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: #343837;
  color: #e6eeee;
  padding: 0 16px;
  font: inherit;
  transition: background-color var(--motion-med) var(--ease-apple), color var(--motion-med) var(--ease-apple);
}

.search button {
  border: 0;
  background: var(--accent-dark);
  color: white;
  cursor: pointer;
  transition: background-color var(--motion-med) var(--ease-apple), transform var(--motion-med) var(--ease-apple);
}

.search:focus-within {
  transform: translate3d(0, -1px, 0);
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.28), 0 0 0 1px rgba(255, 90, 70, 0.22);
}

.search:focus-within input {
  background: #3d4241;
}

.search button:hover {
  background: #c32211;
}

.search button:active {
  transform: scale(0.96);
}

.search svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

.login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  min-width: 106px;
  background: #343837;
  color: #c4caca;
  font-weight: 700;
  transition: transform var(--motion-med) var(--ease-apple), background-color var(--motion-med) var(--ease-apple), color var(--motion-med) var(--ease-apple);
}

.login:hover {
  transform: translate3d(0, -1px, 0);
  background: #414746;
  color: #fff;
}

.page {
  width: var(--content);
  margin: 14px auto 64px;
}

.hero-stage {
  position: relative;
  aspect-ratio: 1600 / 460;
  min-height: 320px;
  overflow: hidden;
  background: #171b1d;
  isolation: isolate;
  transform: translateZ(0);
}

.hero-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-media-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.035);
  transition: opacity 620ms var(--ease-apple-soft), transform 820ms var(--ease-apple-soft), filter 620ms var(--ease-apple-soft);
  will-change: opacity, transform, filter;
}

.hero-media-image.is-active {
  opacity: 1;
  transform: scale(1);
}

.hero-media-image.is-exiting {
  opacity: 0;
  transform: scale(1.018);
  filter: saturate(0.96) brightness(0.88);
}

.hero-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0.12) 42%, rgba(0, 0, 0, 0.1));
}

.hero-copy {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  padding: 34px;
  text-shadow: 0 3px 0 rgba(15, 56, 70, 0.78), 0 18px 36px rgba(0, 0, 0, 0.58);
  transition: opacity 320ms var(--ease-apple), transform 460ms var(--ease-apple), filter 460ms var(--ease-apple);
  will-change: opacity, transform, filter;
}

.hero-stage.is-copy-out .hero-copy {
  opacity: 0;
  transform: translate3d(0, 14px, 0) scale(0.988);
  filter: blur(6px);
}

.hero-stage.is-copy-in .hero-copy {
  animation: heroCopyIn 520ms var(--ease-apple) both;
}

.hero-copy p {
  margin: 0 0 10px;
  color: #dff9ff;
  font-size: clamp(15px, 1.5vw, 24px);
  font-weight: 900;
  letter-spacing: 3px;
}

.hero-copy h1 {
  max-width: 1080px;
  margin: 0;
  color: #f5fdff;
  font-size: clamp(34px, 4.4vw, 66px);
  line-height: 1.12;
  font-weight: 900;
}

.hero-copy span {
  margin-top: 16px;
  color: #f3ffff;
  font-size: clamp(15px, 1.9vw, 28px);
  font-weight: 900;
  letter-spacing: 3px;
}

.library-toolbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.library-toolbar a {
  min-height: 92px;
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.055);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.018));
  color: var(--text);
  transition: transform var(--motion-med) var(--ease-apple), border-color var(--motion-med) var(--ease-apple), background-color var(--motion-med) var(--ease-apple), box-shadow var(--motion-med) var(--ease-apple);
}

.library-toolbar strong {
  font-size: 18px;
  line-height: 1.2;
}

.library-toolbar span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.library-toolbar a:hover {
  transform: translate3d(0, -4px, 0);
  border-color: rgba(255, 98, 77, 0.28);
  background: rgba(255, 98, 77, 0.055);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-top: 42px;
  margin-bottom: 16px;
}

.section-head p {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0;
  color: #eff4f2;
  font-size: 26px;
  line-height: 1.1;
}

.section-head > a {
  color: #a6afad;
  font-size: 14px;
  font-weight: 800;
  transition: color var(--motion-med) var(--ease-apple), transform var(--motion-med) var(--ease-apple);
}

.section-head > a:hover {
  color: #fff;
  transform: translate3d(2px, 0, 0);
}

.hero-dots {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 18px;
  display: flex;
  gap: 10px;
  transform: translateX(-50%);
}

.hero-dots button {
  width: 10px;
  height: 10px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: #31383a;
  cursor: pointer;
  transition: width var(--motion-med) var(--ease-apple), background-color var(--motion-med) var(--ease-apple), transform var(--motion-med) var(--ease-apple), opacity var(--motion-med) var(--ease-apple);
}

.hero-dots button.active {
  width: 28px;
  background: #087be8;
}

.hero-dots button:hover {
  transform: scale(1.18);
}

.promo-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 36px;
  margin-top: 0;
}

.promo-card,
.resource-card {
  min-width: 0;
  transform: translateZ(0);
  transition: transform var(--motion-med) var(--ease-apple), opacity var(--motion-med) var(--ease-apple), filter var(--motion-med) var(--ease-apple);
  will-change: transform, opacity;
}

.promo-card img,
.resource-card img {
  width: 100%;
  aspect-ratio: 520 / 280;
  object-fit: cover;
  background: #202526;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
  transition: transform 760ms var(--ease-apple), filter 760ms var(--ease-apple), box-shadow 760ms var(--ease-apple);
  will-change: transform, filter;
}

.promo-card:hover img,
.resource-card:hover img {
  transform: translate3d(0, -4px, 0) scale(1.012);
  filter: brightness(1.08) saturate(1.06);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.34);
}

.promo-card:hover,
.resource-card:hover {
  transform: translate3d(0, -6px, 0);
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 44px 36px;
  margin-top: 0;
}

.resource-head {
  margin-top: 52px;
}

.filter-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.filter-pills button {
  height: 34px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.075);
  background: #171d1c;
  color: #a9b2b0;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: background-color var(--motion-med) var(--ease-apple), border-color var(--motion-med) var(--ease-apple), color var(--motion-med) var(--ease-apple), transform var(--motion-med) var(--ease-apple);
}

.filter-pills button:hover,
.filter-pills button.active {
  border-color: rgba(255, 98, 77, 0.35);
  background: rgba(255, 98, 77, 0.12);
  color: #fff;
}

.filter-pills button:hover {
  transform: translate3d(0, -2px, 0);
}

.resource-card h2 {
  min-height: 76px;
  margin: 14px 0 12px;
  color: #b8bcbc;
  font-size: 18px;
  line-height: 1.42;
  font-weight: 800;
  transition: color var(--motion-med) var(--ease-apple);
}

.resource-card h2 a:hover {
  color: #fff;
}

.meta {
  display: flex;
  align-items: center;
  gap: 14px;
  color: #9a9f9f;
  font-size: 14px;
  font-weight: 700;
}

.meta span:nth-child(2) {
  color: #d9e4e1;
  padding: 3px 8px;
  background: rgba(255, 255, 255, 0.06);
}

.meta .likes {
  margin-left: auto;
}

.float-bar {
  position: fixed;
  top: 45%;
  right: 0;
  z-index: 9;
  width: 84px;
  transform: translateY(-30%);
  border: 1px solid #303636;
  border-right: 0;
  background: rgba(18, 22, 22, 0.96);
  transition: transform var(--motion-med) var(--ease-apple), opacity var(--motion-med) var(--ease-apple);
}

.float-bar a {
  display: grid;
  place-items: center;
  min-height: 86px;
  border-bottom: 1px solid #303636;
  color: #b9bebe;
  gap: 4px;
  transition: background-color var(--motion-med) var(--ease-apple), color var(--motion-med) var(--ease-apple), transform var(--motion-med) var(--ease-apple);
}

.float-bar a:last-child {
  border-bottom: 0;
}

.float-bar span {
  color: #d7dada;
  font-size: 30px;
  font-style: normal;
  font-weight: 800;
  line-height: 1;
  transition: transform var(--motion-med) var(--ease-apple), color var(--motion-med) var(--ease-apple);
}

.float-bar em {
  font-style: normal;
  font-size: 14px;
  font-weight: 700;
}

.float-bar a:hover {
  background: #1e2525;
  color: #fff;
  transform: translate3d(-6px, 0, 0);
}

.float-bar a:hover span {
  color: #ff6656;
  transform: scale(1.08);
}

.reveal-item {
  opacity: 0;
  transform: translate3d(0, 28px, 0) scale(0.985);
  filter: blur(8px);
  transition: opacity 820ms var(--ease-apple), transform 820ms var(--ease-apple), filter 820ms var(--ease-apple);
}

.reveal-item.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
  filter: blur(0);
}

@keyframes navLineIn {
  from {
    transform: scaleX(0);
    opacity: 0;
  }
  to {
    transform: scaleX(1);
    opacity: 1;
  }
}

@keyframes heroCopyIn {
  from {
    opacity: 0;
    transform: translate3d(0, 18px, 0) scale(0.988);
    filter: blur(8px);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1);
    filter: blur(0);
  }
}

.resource-card.is-hidden,
.promo-card.is-hidden {
  display: none;
}

@media (max-width: 1320px) {
  :root {
    --content: min(1180px, calc(100vw - 36px));
  }

  .header-inner {
    grid-template-columns: auto 1fr;
    gap: 18px;
    padding: 16px 0;
  }

  .brand {
    min-width: 0;
  }

  .main-nav {
    grid-column: 1 / -1;
    order: 3;
    width: 100%;
    height: auto;
    overflow-x: auto;
    padding: 4px 0 2px;
  }

  .main-nav a.active::after {
    bottom: -3px;
  }

  .search {
    justify-self: end;
    width: min(420px, 100%);
  }

  .login {
    display: none;
  }

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

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

  .float-bar {
    display: none;
  }
}

@media (max-width: 1520px) {
  .header-inner {
    grid-template-columns: auto 1fr;
    gap: 18px;
    padding: 16px 0;
  }

  .brand {
    min-width: 0;
  }

  .main-nav {
    grid-column: 1 / -1;
    order: 3;
    width: 100%;
    height: auto;
    overflow-x: auto;
    padding: 4px 0 2px;
  }

  .main-nav a.active::after {
    bottom: -3px;
  }

  .search {
    justify-self: end;
    width: min(420px, 100%);
  }

  .login {
    display: none;
  }

  .float-bar {
    display: none;
  }
}

@media (max-width: 720px) {
  :root {
    --content: calc(100vw - 24px);
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    min-height: 76px;
    gap: 14px;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
  }

  .brand-name {
    font-size: 20px;
  }

  .menu-toggle {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: #202525;
    color: #dce1e1;
    font-size: 20px;
  }

  .menu-toggle:hover,
  .menu-toggle[aria-expanded="true"] {
    background: #2a3030;
    color: #fff;
  }

  .menu-toggle[aria-expanded="true"] {
    transform: rotate(90deg);
  }

  .main-nav {
    display: flex;
    grid-column: 1 / -1;
    flex-wrap: wrap;
    gap: 14px 20px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    transform: translate3d(0, -8px, 0);
    transition: max-height 720ms var(--ease-apple), opacity 520ms var(--ease-apple), transform 720ms var(--ease-apple);
  }

  .main-nav.is-open {
    max-height: 240px;
    opacity: 1;
    pointer-events: auto;
    transform: translate3d(0, 0, 0);
  }

  .search {
    grid-column: 1 / -1;
    justify-self: stretch;
    width: 100%;
  }

  .page {
    margin-top: 12px;
  }

  .hero-stage {
    aspect-ratio: 1 / 1;
    min-height: 0;
  }

  .hero-copy {
    padding: 22px;
  }

  .hero-copy p {
    letter-spacing: 2px;
  }

  .hero-copy span {
    letter-spacing: 2px;
  }

  .library-toolbar {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 14px;
  }

  .library-toolbar a {
    min-height: 82px;
    padding: 16px;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    margin-top: 34px;
  }

  .section-head h2 {
    font-size: 23px;
  }

  .filter-pills {
    justify-content: flex-start;
  }

  .promo-grid,
  .resource-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .resource-grid {
    margin-top: 0;
  }

  .resource-card h2 {
    min-height: auto;
    font-size: 18px;
  }
}

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

  .hero-media-image,
  .reveal-item {
    filter: none !important;
    transform: none !important;
  }
}