/*
 * PUXIN content page standard v1
 *
 * Shared visual contract derived from the home dashboard:
 * porcelain grid canvas, low-contrast 1px rules, compact information panels,
 * restrained cyan accents, and real imagery faded behind live HTML copy.
 */

:root {
  --puxin-page-canvas: #f5f5f7;
  --puxin-page-paper: #ffffff;
  --puxin-page-ink: #0c1827;
  --puxin-page-text: #1e2935;
  --puxin-page-muted: #697581;
  --puxin-page-line: rgba(60, 60, 67, .16);
  --puxin-page-line-strong: rgba(12, 24, 39, .24);
  --puxin-page-cyan: #21c7f3;
  --puxin-page-blue: #0a84ff;
  --puxin-page-purple: #7450c5;
  --puxin-page-teal: #11aeb8;
  --puxin-page-green: #0b9d6d;
  --puxin-page-shadow-panel: 0 10px 28px rgba(15, 23, 42, .06);
  --puxin-page-shadow-hero: 0 14px 34px rgba(15, 23, 42, .14);
  --puxin-page-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--puxin-page-canvas);
}

body.puxin-content-page {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--puxin-page-text);
  background-color: var(--puxin-page-canvas);
  background-image:
    linear-gradient(rgba(60, 60, 67, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(60, 60, 67, .035) 1px, transparent 1px);
  background-size: 28px 28px;
  font-family: var(--puxin-page-font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.puxin-page-main {
  width: min(1380px, calc(100% - 32px));
  margin: 0 auto;
  padding: 12px 0;
  display: grid;
  gap: 10px;
}

.puxin-page-hero,
.puxin-content-panel,
.puxin-start-strip {
  min-width: 0;
  border: 1px solid var(--puxin-page-line);
  background: rgba(255, 255, 255, .92);
}

.puxin-page-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-color: rgba(15, 23, 42, .18);
  border-radius: 20px;
  box-shadow: var(--puxin-page-shadow-hero);
}

.puxin-page-hero__media,
.puxin-page-hero__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.puxin-page-hero__media {
  z-index: -2;
  margin: 0;
}

.puxin-page-hero__media img {
  display: block;
  object-fit: cover;
}

.puxin-page-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  pointer-events: none;
}

.puxin-page-hero__copy {
  position: absolute;
  top: 50%;
  left: clamp(24px, 3.8vw, 54px);
  width: min(570px, 56%);
  transform: translateY(-50%);
}

.puxin-page-kicker,
.puxin-section-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--puxin-page-purple);
  font-size: 10px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: .08em;
}

.puxin-page-kicker::before,
.puxin-section-label::before {
  content: "";
  width: 18px;
  height: 2px;
  flex: 0 0 18px;
  border-radius: 999px;
  background: currentColor;
}

.puxin-page-hero h1 {
  margin: 5px 0 5px;
  color: #ffffff;
  font-size: clamp(26px, 2.35vw, 35px);
  font-weight: 930;
  line-height: 1.08;
  letter-spacing: -.04em;
}

.puxin-page-hero__lede {
  max-width: 550px;
  margin: 0;
  color: rgba(255, 255, 255, .78);
  font-size: 11.5px;
  font-weight: 650;
  line-height: 1.48;
}

.puxin-content-panel {
  overflow: hidden;
  padding: 14px;
  border-radius: 18px;
  box-shadow: var(--puxin-page-shadow-panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.puxin-section-heading {
  margin: 0 0 9px;
}

.puxin-section-heading h2 {
  margin: 4px 0 3px;
  color: var(--puxin-page-ink);
  font-size: clamp(20px, 1.7vw, 26px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.025em;
}

.puxin-section-heading p {
  margin: 0;
  color: var(--puxin-page-muted);
  font-size: 10.8px;
  font-weight: 560;
  line-height: 1.48;
}

.puxin-route-grid {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 9px;
}

.puxin-route-card {
  --route-accent: var(--puxin-page-blue);
  --route-soft: #eef7ff;
  position: relative;
  isolation: isolate;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  padding: 11px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--puxin-page-line);
  border-top: 3px solid var(--route-accent);
  border-radius: 15px;
  color: var(--puxin-page-text);
  background: var(--puxin-page-paper);
  text-decoration: none;
  box-shadow: none;
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.puxin-route-card--tools {
  --route-accent: var(--puxin-page-teal);
  --route-soft: #ebfbfc;
}

.puxin-route-card--ai {
  --route-accent: var(--puxin-page-purple);
  --route-soft: #f5f0ff;
}

.puxin-route-card--works {
  --route-accent: var(--puxin-page-green);
  --route-soft: #ecfaf4;
}

.puxin-route-card__media {
  position: absolute;
  z-index: -2;
  inset: 0;
  margin: 0;
  overflow: hidden;
  pointer-events: none;
}

.puxin-route-card__media img {
  width: 100%;
  height: 66%;
  display: block;
  object-fit: cover;
  object-position: center;
  opacity: .42;
  filter: saturate(.84) contrast(.96);
  transform: scale(1.02);
  transform-origin: center 38%;
  transition: opacity .38s ease, transform .38s ease;
}

.puxin-route-card--lab .puxin-route-card__media img {
  object-position: center 42%;
}

.puxin-route-card--tools .puxin-route-card__media img {
  object-position: 58% 45%;
}

.puxin-route-card--ai .puxin-route-card__media img {
  object-position: center 44%;
}

.puxin-route-card--works .puxin-route-card__media img {
  object-position: center 38%;
}

.puxin-route-card__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, .96) 0%, rgba(255, 255, 255, .66) 44%, rgba(255, 255, 255, .08) 100%),
    linear-gradient(0deg, #ffffff 24%, rgba(255, 255, 255, .97) 43%, rgba(255, 255, 255, .24) 75%, rgba(255, 255, 255, .05) 100%);
}

.puxin-route-card__head,
.puxin-route-card__body {
  position: relative;
  z-index: 1;
}

.puxin-route-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.puxin-route-card__icon {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--route-accent) 30%, transparent);
  border-radius: 11px;
  color: var(--route-accent);
  background: color-mix(in srgb, var(--route-soft) 84%, rgba(255, 255, 255, .76));
  box-shadow: 0 3px 10px rgba(15, 23, 42, .06);
  font-family: "Segoe UI Symbol", "Arial Unicode MS", sans-serif;
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}

.puxin-route-card__phase {
  min-height: 24px;
  padding: 0 8px;
  display: inline-flex;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--route-accent) 24%, transparent);
  border-radius: 8px;
  color: var(--route-accent);
  background: rgba(255, 255, 255, .86);
  box-shadow: 0 3px 10px rgba(15, 23, 42, .04);
  font-size: 8.5px;
  font-weight: 850;
  line-height: 1;
  letter-spacing: .04em;
  white-space: nowrap;
}

.puxin-route-card__body {
  flex: 1;
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.puxin-route-card h3 {
  margin: 0 0 1px;
  color: var(--puxin-page-ink);
  font-size: 16px;
  font-weight: 880;
  line-height: 1.22;
  letter-spacing: -.015em;
}

.puxin-route-card__subtitle {
  display: block;
  margin-bottom: 6px;
  color: #87909a;
  font-size: 8px;
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: .025em;
}

.puxin-route-card__description {
  margin: 0 0 7px;
  color: #566473;
  font-size: 9.6px;
  font-weight: 540;
  line-height: 1.46;
}

.puxin-route-card__tags {
  margin: 0 0 9px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
}

.puxin-route-card__tags li {
  min-height: 21px;
  padding: 0 6px;
  display: inline-flex;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--route-accent) 18%, var(--puxin-page-line));
  border-radius: 7px;
  color: #5a6672;
  background: rgba(255, 255, 255, .80);
  font-size: 8.4px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}

.puxin-route-card__tags li::before {
  content: "";
  width: 4px;
  height: 4px;
  margin-right: 4px;
  border-radius: 50%;
  background: var(--route-accent);
}

.puxin-route-card__cta {
  min-height: 29px;
  margin-top: auto;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--route-accent);
  border-radius: 8px;
  color: #ffffff;
  background: var(--route-accent);
  box-shadow: 0 5px 13px color-mix(in srgb, var(--route-accent) 22%, transparent);
  font-size: 9.5px;
  font-weight: 800;
  line-height: 1;
}

.puxin-route-card__cta span {
  font-size: 13px;
  transition: transform .2s ease;
}

.puxin-start-strip {
  position: relative;
  overflow: hidden;
  min-height: 62px;
  padding: 8px 10px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  border-color: rgba(255, 255, 255, .13);
  border-radius: 16px;
  color: #ffffff;
  background:
    radial-gradient(circle at 78% 18%, rgba(33, 199, 243, .20), transparent 24%),
    linear-gradient(112deg, #0c1827 0%, #28265c 55%, #613b68 82%, #a4432c 100%);
  box-shadow: 0 10px 28px rgba(15, 23, 42, .12);
}

.puxin-start-strip__copy {
  position: relative;
  z-index: 1;
  min-width: 0;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
}

.puxin-composition-mark {
  position: relative;
  width: 38px;
  height: 38px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 10px;
  background: rgba(255, 255, 255, .10);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12);
}

.puxin-composition-mark__point,
.puxin-composition-mark__line,
.puxin-composition-mark__plane {
  position: absolute;
  display: block;
}

.puxin-composition-mark__point {
  left: 7px;
  bottom: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #ffc900;
}

.puxin-composition-mark__line {
  left: 12px;
  bottom: 14px;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #21c7f3;
  transform: rotate(-38deg);
  transform-origin: left center;
}

.puxin-composition-mark__plane {
  top: 8px;
  right: 7px;
  width: 10px;
  height: 10px;
  border: 2px solid #ffffff;
  border-radius: 2px;
}

.puxin-start-strip__eyebrow {
  display: block;
  margin-bottom: 1px;
  color: #a6ecff;
  font-size: 8px;
  font-weight: 850;
  line-height: 1.15;
  letter-spacing: .07em;
}

.puxin-start-strip h2 {
  margin: 0 0 1px;
  font-size: 14px;
  font-weight: 850;
  line-height: 1.18;
}

.puxin-start-strip p {
  margin: 0;
  color: rgba(255, 255, 255, .70);
  font-size: 9px;
  font-weight: 550;
  line-height: 1.32;
}

.puxin-start-strip__cta {
  position: relative;
  z-index: 1;
  min-height: 32px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, .74);
  border-radius: 999px;
  color: var(--puxin-page-ink);
  background: #ffffff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .14);
  font-size: 9px;
  font-weight: 820;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: transform .2s ease, box-shadow .2s ease;
}

.puxin-site-footer {
  min-height: 40px;
  padding: 0 16px;
  border-top: 1px solid rgba(255, 255, 255, .10);
  color: rgba(255, 255, 255, .58);
  background: #07111f;
  font-family: var(--puxin-page-font);
  font-size: 8.5px;
}

.puxin-site-footer__inner {
  width: min(1380px, 100%);
  min-height: 40px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.puxin-site-footer p {
  margin: 0;
}

.puxin-site-footer a {
  color: rgba(255, 255, 255, .66);
  text-decoration: none;
}

.puxin-route-card:focus-visible,
.puxin-start-strip__cta:focus-visible,
.puxin-site-footer a:focus-visible {
  outline: 3px solid rgba(33, 199, 243, .42);
  outline-offset: 2px;
}

@media (hover: hover) {
  .puxin-route-card:hover {
    border-color: color-mix(in srgb, var(--route-accent) 46%, var(--puxin-page-line));
    box-shadow: 0 16px 30px rgba(15, 23, 42, .10);
    transform: translateY(-2px);
  }

  .puxin-route-card:hover .puxin-route-card__media img {
    opacity: .53;
    transform: scale(1.05) translateY(-2px);
  }

  .puxin-route-card:hover .puxin-route-card__cta span {
    transform: translateX(2px);
  }

  .puxin-start-strip__cta:hover {
    box-shadow: 0 9px 22px rgba(0, 0, 0, .20);
    transform: translateY(-1px);
  }

  .puxin-site-footer a:hover {
    color: #ffffff;
  }
}

@media (min-width: 901px) {
  body.puxin-content-page {
    min-height: 100svh;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
  }

  body.puxin-content-page > .puxin-brandbar {
    position: relative;
  }

  body.puxin-content-page > .puxin-brandbar .puxin-brandbar__inner {
    min-height: 64px;
  }

  .course-hub-main {
    height: 100%;
    max-height: 760px;
    min-height: 0;
    align-self: center;
    grid-template-rows: clamp(146px, 18vh, 168px) minmax(0, 1fr) 62px;
  }

  .course-hub-panel {
    min-height: 0;
    display: flex;
    flex-direction: column;
  }

  .course-hub-panel .puxin-route-grid {
    flex: 1;
    min-height: 0;
  }

  .course-hub-panel .puxin-route-card {
    height: 100%;
  }
}

@media (min-width: 1440px) and (min-height: 800px) {
  .puxin-content-panel {
    padding: 16px;
  }

  .puxin-route-card {
    padding: 13px;
  }

  .puxin-route-card h3 {
    font-size: 17px;
  }

  .puxin-route-card__description {
    font-size: 10.2px;
  }
}

@media (min-width: 901px) and (max-height: 700px) {
  .course-hub-main {
    grid-template-rows: 134px minmax(0, 1fr) 56px;
  }

  .puxin-page-hero h1 {
    font-size: 26px;
  }

  .puxin-page-hero__lede {
    font-size: 10.5px;
  }

  .puxin-start-strip {
    min-height: 56px;
    padding-block: 6px;
  }
}

@media (min-width: 901px) and (max-width: 1120px) {
  .course-hub-main {
    height: auto;
    max-height: none;
    align-self: start;
    grid-template-rows: 156px auto 62px;
  }

  .course-hub-panel {
    overflow: visible;
  }

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

  .course-hub-panel .puxin-route-card {
    min-height: 300px;
  }
}

@media (max-width: 900px) {
  .puxin-page-main {
    width: min(100% - 24px, 760px);
  }

  .puxin-page-hero {
    height: clamp(220px, 42vw, 280px);
  }

  .puxin-page-hero__copy {
    width: min(600px, 72%);
  }

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

  .puxin-route-card {
    min-height: 300px;
  }
}

@media (max-width: 640px) {
  .puxin-page-main {
    width: calc(100% - 20px);
    padding-block: 10px;
  }

  .puxin-page-hero {
    height: 248px;
    border-radius: 18px;
  }

  .puxin-page-hero__media img {
    object-position: 60% center;
  }

  .puxin-page-hero::after {
    background: linear-gradient(90deg, rgba(4, 10, 20, .97) 0%, rgba(4, 10, 20, .88) 52%, rgba(4, 10, 20, .28) 86%, rgba(4, 10, 20, .10) 100%);
  }

  .puxin-page-hero__copy {
    left: 17px;
    width: calc(100% - 34px);
  }

  .puxin-page-kicker,
  .puxin-section-label {
    font-size: 8.5px;
  }

  .puxin-page-hero h1 {
    max-width: 420px;
    font-size: clamp(24px, 7.2vw, 30px);
  }

  .puxin-page-hero__lede {
    max-width: 390px;
    font-size: 10.8px;
  }

  .puxin-content-panel {
    padding: 14px;
    border-radius: 17px;
  }

  .puxin-section-heading h2 {
    font-size: 21px;
  }

  .puxin-route-grid {
    grid-template-columns: 1fr;
  }

  .puxin-route-card {
    min-height: 304px;
  }

  .puxin-route-card__description {
    max-width: 520px;
    font-size: 10.5px;
  }

  .puxin-start-strip {
    min-height: 112px;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 11px;
  }

  .puxin-start-strip__cta {
    justify-self: start;
    margin-left: 48px;
  }

  .puxin-site-footer {
    padding-block: 12px;
  }

  .puxin-site-footer__inner {
    min-height: 0;
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .puxin-route-card,
  .puxin-route-card__media img,
  .puxin-route-card__cta span,
  .puxin-start-strip__cta {
    transition-duration: .001ms;
  }
}

/* Course hub: a structural learning path, not a decorative progress widget. */
.course-hub-hero::after {
  background: linear-gradient(90deg, rgba(3, 8, 20, .97) 0%, rgba(3, 8, 20, .88) 32%, rgba(3, 8, 20, .26) 58%, rgba(3, 8, 20, .04) 82%);
}

.course-hub-hero .puxin-page-kicker {
  color: #a5ecff;
}

.course-hub-sequence {
  position: relative;
  width: min(500px, 100%);
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 5px;
  list-style: none;
}

.course-hub-sequence::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  top: 4px;
  height: 1px;
  background: linear-gradient(90deg, #21c7f3, rgba(255, 255, 255, .50));
}

.course-hub-sequence li {
  position: relative;
  min-width: 0;
  padding-top: 11px;
  color: rgba(255, 255, 255, .72);
  font-size: 8.5px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

.course-hub-sequence li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 9px;
  height: 9px;
  border: 2px solid rgba(255, 255, 255, .72);
  border-radius: 50%;
  background: #0b1624;
}

.course-hub-sequence li:first-child::before {
  border-color: #21c7f3;
  background: #21c7f3;
  box-shadow: 0 0 0 3px rgba(33, 199, 243, .18);
}

.course-hub-sequence strong {
  margin-right: 3px;
  color: #ffffff;
  font-size: 8px;
  font-weight: 900;
}