:root {
  --page: #ffffff;
  --surface: #f5f7fb;
  --surface-strong: #eef2f8;
  --surface-elevated: #ffffff;
  --text: #101b33;
  --text-soft: #526079;
  --text-faint: #78859b;
  --line: #dfe5ee;
  --line-strong: #cbd5e3;
  --accent: #2257d9;
  --accent-hover: #1949bf;
  --accent-soft: #eaf0ff;
  --success: #117a55;
  --danger: #c23342;
  --header-bg: rgba(255, 255, 255, 0.92);
  --shadow-sm: 0 8px 24px rgba(25, 57, 116, 0.08);
  --shadow-lg: 0 28px 70px rgba(25, 57, 116, 0.15);
  --radius-card: 14px;
  --radius-control: 10px;
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  color: var(--text);
  background: var(--page);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

:root[data-theme="dark"] {
  --page: #0e1421;
  --surface: #151d2c;
  --surface-strong: #1b2536;
  --surface-elevated: #182131;
  --text: #edf2fb;
  --text-soft: #aab5c8;
  --text-faint: #8290a7;
  --line: #29364a;
  --line-strong: #3b4a60;
  --accent: #6f98ff;
  --accent-hover: #86a9ff;
  --accent-soft: #1a2a50;
  --success: #60d2a7;
  --danger: #ff8793;
  --header-bg: rgba(14, 20, 33, 0.92);
  --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 28px 70px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100dvh;
  background: var(--page);
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 32%, transparent);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(18px);
}

.site-header__inner {
  width: min(1320px, calc(100% - 40px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
}

.brand__mark {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  color: #ffffff;
  background: var(--accent);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: -0.04em;
  clip-path: polygon(25% 6%, 75% 6%, 100% 50%, 75% 94%, 25% 94%, 0 50%);
}

.brand__name {
  font-size: 19px;
  font-weight: 850;
  letter-spacing: -0.04em;
}

.site-nav {
  display: flex;
  align-items: stretch;
  align-self: stretch;
  margin-right: auto;
}

.site-nav__item {
  position: relative;
  border: 0;
  padding: 0 14px;
  background: transparent;
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  white-space: nowrap;
}

.site-nav__item::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: -1px;
  left: 14px;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.site-nav__item:hover,
.site-nav__item.is-active {
  color: var(--text);
}

.site-nav__item.is-active::after {
  transform: scaleX(1);
}

.site-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-button,
.mobile-menu-button {
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  background: transparent;
  cursor: pointer;
}

.icon-button:hover,
.mobile-menu-button:hover {
  border-color: var(--line);
  background: var(--surface);
}

.account-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-control);
  padding: 0 14px;
  background: var(--accent);
  color: #ffffff;
  font-size: 13px;
  font-weight: 750;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 160ms ease, background 160ms ease;
}

.account-button:hover {
  background: var(--accent-hover);
}

.account-button:active,
.primary-button:active {
  transform: translateY(1px) scale(0.99);
}

.mobile-menu-button {
  display: none;
}

.header-search {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
  padding: 12px 0 16px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
}

.header-search input {
  min-width: 0;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  padding: 0 14px;
  background: var(--surface-elevated);
  color: var(--text);
}

.header-search button {
  height: 44px;
  border: 0;
  border-radius: var(--radius-control);
  padding: 0 20px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 750;
  cursor: pointer;
}

.header-search[hidden] {
  display: none;
}

.mobile-nav {
  display: none;
}

.resource-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface-elevated);
  transition: transform 220ms cubic-bezier(0.16, 1, 0.3, 1), border-color 220ms ease, box-shadow 220ms ease;
}

.resource-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
}

.resource-card__media {
  width: 100%;
  display: block;
  overflow: hidden;
  border: 0;
  padding: 0;
  background: var(--surface-strong);
  cursor: pointer;
}

.resource-card__media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  display: block;
  object-fit: cover;
  transition: transform 420ms cubic-bezier(0.16, 1, 0.3, 1);
}

.resource-card:hover .resource-card__media img {
  transform: scale(1.035);
}

.resource-card__body {
  padding: 18px;
}

.resource-card__taxonomy {
  display: flex;
  gap: 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
}

.resource-card__taxonomy span + span::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.resource-card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  line-height: 1.4;
}

.resource-card h3 button {
  border: 0;
  padding: 0;
  background: transparent;
  color: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.resource-card p {
  min-height: 46px;
  margin: 0 0 18px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.65;
}

.resource-card__footer,
.resource-card__meta,
.resource-card__meta span {
  display: flex;
  align-items: center;
}

.resource-card__footer {
  justify-content: space-between;
  gap: 12px;
}

.resource-card__meta {
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-faint);
  font-size: 12px;
}

.resource-card__meta span {
  gap: 4px;
}

.price {
  color: var(--accent);
  font-size: 19px;
  white-space: nowrap;
}

.price--free {
  color: var(--success);
}

.resource-card--wide {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(270px, 0.8fr);
}

.resource-card--wide .resource-card__media img {
  height: 100%;
  min-height: 360px;
  aspect-ratio: auto;
}

.resource-card--wide .resource-card__body {
  padding: 34px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.resource-card--wide h3 {
  font-size: clamp(24px, 3vw, 36px);
  letter-spacing: -0.04em;
}

.resource-card--wide p {
  min-height: 0;
  margin-bottom: 26px;
  font-size: 15px;
}

.text-link {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 24px;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--accent);
  font-weight: 800;
  cursor: pointer;
}

.resource-card--compact {
  display: grid;
  grid-template-columns: 128px 1fr;
}

.resource-card--compact .resource-card__media img {
  height: 100%;
  aspect-ratio: auto;
}

.resource-card--compact .resource-card__body {
  padding: 15px;
}

.resource-card--compact h3 {
  margin: 7px 0 14px;
  font-size: 15px;
}

.resource-card--compact .resource-card__meta span:first-child {
  display: none;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(5, 12, 28, 0.58);
  backdrop-filter: blur(8px);
}

.login-modal {
  position: relative;
  width: min(440px, 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 32px;
  background: var(--surface-elevated);
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: var(--radius-control);
  background: var(--surface);
  cursor: pointer;
}

.login-modal__heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 26px;
}

.login-modal__heading h2 {
  margin: 0 0 4px;
  font-size: 24px;
}

.login-modal__heading p {
  margin: 0;
  color: var(--text-soft);
  font-size: 13px;
}

.login-modal form {
  display: grid;
  gap: 9px;
}

.login-modal label {
  margin-top: 5px;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
}

.input-shell {
  height: 46px;
  display: flex;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  padding: 0 13px;
  background: var(--page);
  color: var(--text-faint);
}

.input-shell:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}

.input-shell input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
}

.primary-button {
  min-height: 46px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-control);
  padding: 0 20px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease;
}

.primary-button:hover {
  background: var(--accent-hover);
}

.login-submit {
  margin-top: 10px;
}

.form-error {
  margin: 2px 0 0;
  color: var(--danger);
  font-size: 12px;
}

.login-modal__links {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
}

.login-modal__links button {
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

@media (max-width: 1120px) {
  .site-header__inner {
    gap: 16px;
  }

  .site-nav__item {
    padding-inline: 9px;
  }

  .site-nav__item::after {
    right: 9px;
    left: 9px;
  }

  .account-button span {
    display: none;
  }
}

@media (max-width: 880px) {
  .site-header__inner {
    width: min(100% - 28px, 760px);
  }

  .site-nav,
  .account-button {
    display: none;
  }

  .site-actions {
    margin-left: auto;
  }

  .mobile-menu-button {
    display: inline-grid;
  }

  .mobile-nav {
    width: min(100% - 28px, 760px);
    margin: 0 auto;
    padding: 8px 0 16px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .mobile-nav button {
    border: 1px solid var(--line);
    border-radius: var(--radius-control);
    padding: 11px 12px;
    background: var(--surface);
    text-align: left;
    cursor: pointer;
  }

  .resource-card--wide {
    grid-template-columns: 1fr;
  }

  .resource-card--wide .resource-card__media img {
    min-height: 0;
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 560px) {
  .brand__name {
    font-size: 16px;
  }

  .site-actions {
    gap: 2px;
  }

  .header-search {
    width: calc(100% - 28px);
    grid-template-columns: auto 1fr;
  }

  .header-search button {
    grid-column: 1 / -1;
  }

  .resource-card--compact {
    grid-template-columns: 104px 1fr;
  }

  .resource-card--wide .resource-card__body,
  .login-modal {
    padding: 24px;
  }
}

@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;
  }
}