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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  min-width: 320px;
}

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

ul[class],
ol[class] {
  list-style: none;
}

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

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

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

:root {
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --headline-weight: 800;
  --body-weight: 300;
  --headline-scale: clamp(2rem, 4vw, 3.5rem);
  --body-scale: clamp(0.95rem, 1.2vw, 1.1rem);
  --paper-light: #F4F6F8;
  --night-blue: #101828;
  --spring-bud: #3EB88D;
  --summer-sky: #2A9FB5;
  --autumn-amber: #E8823A;
  --winter-mist: #D9E2E8;
  --brand-gold: #C9A961;
  --electric-pulse: #3D5AFE;
  --velvet-purple: #7C5CF0;
  --glass-white: rgba(255, 255, 255, 0.7);
  --content-width: 1200px;
  --page-gutter: clamp(16px, 4vw, 32px);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;
  --space-7: 96px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 40px rgba(16, 24, 40, 0.08);
  --shadow-lift: 0 24px 60px rgba(16, 24, 40, 0.14);
  --ease: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  background: var(--paper-light);
  color: var(--night-blue);
  font-family: var(--font-sans);
  font-size: var(--body-scale);
  font-weight: var(--body-weight);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  font-weight: var(--headline-weight);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

p {
  line-height: 1.8;
  font-weight: var(--body-weight);
}

:focus-visible {
  outline: 3px solid var(--electric-pulse);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 20px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--night-blue);
  color: #ffffff;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.92rem;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 80;
  margin-top: 16px;
  padding: 0 var(--page-gutter);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 8px 10px 8px 20px;
  background: var(--glass-white);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-soft);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  flex-shrink: 0;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--spring-bud) 0%, var(--summer-sky) 45%, var(--autumn-amber) 75%, var(--brand-gold) 100%);
  border-radius: 16px;
  color: var(--night-blue);
  font-size: 1.3rem;
  font-weight: 800;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6), 0 8px 20px rgba(16, 24, 40, 0.18);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__name {
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.site-brand__tagline {
  margin-top: 2px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: rgba(16, 24, 40, 0.62);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  color: var(--night-blue);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--ease), color var(--ease), transform var(--ease);
}

.site-nav__link:hover {
  background: rgba(61, 90, 254, 0.08);
  color: var(--electric-pulse);
  transform: translateY(-1px);
}

.site-nav__link[aria-current="page"] {
  background: var(--night-blue);
  color: #ffffff;
  box-shadow: 0 10px 20px rgba(16, 24, 40, 0.18);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: transparent;
  border: 0;
  cursor: pointer;
  border-radius: var(--radius-pill);
}

.nav-toggle__label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--night-blue);
}

.nav-toggle__icon {
  display: inline-flex;
  flex-direction: column;
  width: 20px;
  gap: 4px;
}

.nav-toggle__bar {
  height: 2px;
  width: 100%;
  background: var(--night-blue);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 840px) {
  .site-header {
    top: 8px;
    margin-top: 8px;
    padding: 0 12px;
  }

  .site-header__inner {
    padding: 8px 12px;
    border-radius: 28px;
  }

  .site-brand__mark {
    width: 40px;
    height: 40px;
    border-radius: 14px;
    font-size: 1.1rem;
  }

  .site-brand__tagline {
    display: none;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 10px;
  }

  .site-nav[data-open] {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 18px;
    font-size: 1rem;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: var(--space-6);
  background: linear-gradient(145deg, #0D1522 0%, #101828 52%, #17233C 100%);
  color: rgba(244, 246, 248, 0.86);
  padding-bottom: 0;
}

.site-footer::before {
  content: "四季";
  position: absolute;
  right: -20px;
  top: -80px;
  font-size: 18rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  pointer-events: none;
  user-select: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--spring-bud), var(--summer-sky), var(--autumn-amber), var(--winter-mist), var(--brand-gold));
  background-size: 300% 100%;
  animation: seasonFlow 14s ease-in-out infinite;
}

@keyframes seasonFlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--page-gutter);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.site-footer .site-brand__name {
  color: #ffffff;
}

.site-footer .site-brand__tagline {
  color: rgba(255, 255, 255, 0.6);
}

.site-brand--footer .site-brand__mark {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.site-footer__trust {
  max-width: 720px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(244, 246, 248, 0.62);
}

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

.site-footer__title {
  margin-bottom: 14px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand-gold);
}

.site-footer__links,
.site-footer__meta {
  display: grid;
  gap: 10px;
}

.site-footer__links a {
  color: rgba(244, 246, 248, 0.8);
  font-size: 0.95rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__links a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.site-footer__meta li {
  display: flex;
  gap: 8px;
  font-size: 0.92rem;
  color: rgba(244, 246, 248, 0.74);
}

.site-footer__meta li::before {
  content: "·";
  color: var(--brand-gold);
  flex-shrink: 0;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(244, 246, 248, 0.52);
  font-size: 0.84rem;
}

.site-footer__icp {
  letter-spacing: 0.08em;
}

@media (max-width: 900px) {
  .site-footer__columns {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .site-footer__columns {
    grid-template-columns: 1fr;
  }
}

.content-container {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-6) var(--page-gutter);
}

.content-container--wide {
  max-width: var(--content-width);
}

.section {
  padding: var(--space-5) 0;
}

.section__title {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section__subtitle {
  margin-top: 8px;
  color: rgba(16, 24, 40, 0.62);
  max-width: 720px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: var(--space-4);
  font-size: 0.86rem;
  color: rgba(16, 24, 40, 0.6);
}

.breadcrumb li + li::before {
  content: "/";
  margin: 0 6px;
  color: rgba(16, 24, 40, 0.3);
}

.breadcrumb a {
  color: var(--electric-pulse);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--velvet-purple);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--brand-gold);
}

.annotation {
  font-size: 0.72rem;
  line-height: 1.8;
  letter-spacing: 0.22em;
  color: rgba(16, 24, 40, 0.45);
}

.annotation--vertical {
  writing-mode: vertical-rl;
  max-height: 180px;
  white-space: nowrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.btn--primary {
  background: var(--electric-pulse);
  color: #ffffff;
}

.btn--primary:hover {
  background: #2E4EF5;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(61, 90, 254, 0.28);
}

.btn--gold {
  background: var(--brand-gold);
  color: var(--night-blue);
}

.btn--gold:hover {
  background: #D8BC72;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(201, 169, 97, 0.3);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(16, 24, 40, 0.15);
  color: var(--night-blue);
}

.btn--ghost:hover {
  border-color: var(--electric-pulse);
  color: var(--electric-pulse);
  transform: translateY(-2px);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.bento-item {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.bento-item .glass-card {
  flex: 1;
}

.bento-item--span-4 {
  grid-column: span 4;
}

.bento-item--span-5 {
  grid-column: span 5;
}

.bento-item--span-6 {
  grid-column: span 6;
}

.bento-item--span-7 {
  grid-column: span 7;
}

.bento-item--span-8 {
  grid-column: span 8;
}

.bento-item--span-12 {
  grid-column: span 12;
}

.bento-item--feature {
  grid-column: span 8;
  min-height: 320px;
}

.glass-card {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--glass-white);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: var(--shadow-soft);
  transition: transform var(--ease), box-shadow var(--ease), background var(--ease);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  background: rgba(255, 255, 255, 0.82);
}

.glass-card--dark {
  background: var(--night-blue);
  color: #ffffff;
}

.glass-card--gradient {
  background: linear-gradient(135deg, var(--spring-bud), var(--summer-sky));
  color: var(--night-blue);
}

.glass-card__title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.glass-card__text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(16, 24, 40, 0.72);
}

.glass-card--dark .glass-card__text {
  color: rgba(255, 255, 255, 0.78);
}

@media (max-width: 900px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }

  .bento-item,
  .bento-item--span-4,
  .bento-item--span-5,
  .bento-item--span-6,
  .bento-item--span-7,
  .bento-item--span-8,
  .bento-item--span-12,
  .bento-item--feature {
    grid-column: auto;
  }

  .bento-item--feature {
    min-height: 0;
  }
}

.split-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  min-height: calc(100svh - 130px);
  padding: clamp(40px, 6vw, 80px) 0;
}

.split-hero__content {
  position: relative;
}

.split-hero__visual {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  border-radius: 40px;
  background: linear-gradient(135deg, var(--spring-bud), var(--summer-sky) 45%, var(--velvet-purple));
  box-shadow: var(--shadow-soft);
}

.split-hero__visual::before {
  content: "四季";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.18);
}

@media (max-width: 900px) {
  .split-hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .split-hero__visual {
    min-height: 260px;
    order: 2;
  }
}

.dashboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.dashboard__cell {
  display: flex;
}

.stat {
  flex: 1;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--night-blue);
  color: #ffffff;
}

.stat__value {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--brand-gold);
}

.stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 700px) {
  .dashboard {
    grid-template-columns: 1fr;
  }
}

.timeline {
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(var(--spring-bud), var(--summer-sky), var(--autumn-amber), var(--brand-gold));
}

.timeline__item {
  position: relative;
  padding: 0 0 var(--space-4) 44px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper-light);
  border: 3px solid var(--velvet-purple);
}

.timeline__date {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--autumn-amber);
}

.timeline__title {
  margin-top: 4px;
  font-size: 1.1rem;
  font-weight: 800;
}

.timeline__text {
  margin-top: 4px;
  font-size: 0.95rem;
  color: rgba(16, 24, 40, 0.72);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.filter-btn {
  appearance: none;
  padding: 9px 18px;
  border: 1px solid rgba(16, 24, 40, 0.12);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.7);
  color: var(--night-blue);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.filter-btn:hover {
  border-color: var(--electric-pulse);
  color: var(--electric-pulse);
}

.filter-btn[aria-pressed="true"] {
  background: var(--night-blue);
  border-color: var(--night-blue);
  color: #ffffff;
  box-shadow: 0 8px 18px rgba(16, 24, 40, 0.14);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--winter-mist);
  color: var(--night-blue);
}

.badge--spring {
  background: var(--spring-bud);
  color: #ffffff;
}

.badge--summer {
  background: var(--summer-sky);
  color: #ffffff;
}

.badge--autumn {
  background: var(--autumn-amber);
  color: #ffffff;
}

.badge--winter {
  background: var(--night-blue);
  color: var(--winter-mist);
}

.badge--gold {
  background: var(--brand-gold);
  color: var(--night-blue);
}

.media-frame {
  position: relative;
  display: block;
  min-height: 200px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--spring-bud) 0%, var(--summer-sky) 45%, var(--velvet-purple) 100%);
}

.media-frame--wide {
  min-height: 280px;
}

.media-frame--compact {
  min-height: 120px;
}

.media-frame--dark {
  background: linear-gradient(135deg, #1A2440, var(--night-blue));
}

.media-frame:empty::after {
  content: "四季视觉空间";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.is-hidden {
  display: none !important;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .site-footer::after {
    animation: none;
  }

  .glass-card:hover,
  .site-nav__link:hover,
  .btn:hover {
    transform: none;
  }

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