@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600&family=Noto+Serif+SC:wght@500;600;700&display=swap");

:root {
  --bg: #0b0d10;
  --bg-soft: #12161b;
  --card-bg: #171c22;
  --text: #f5f3ee;
  --text-muted: rgba(245, 243, 238, 0.72);
  --line: rgba(255, 255, 255, 0.08);
  --accent: #b79a6b;
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at 10% 10%, #151b22 0%, var(--bg) 52%),
    linear-gradient(160deg, #0b0d10 0%, #0f1318 100%);
  font-family: "Noto Sans SC", "Inter", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}

body.lang-en {
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
}

body.lang-en h1,
body.lang-en h2,
body.lang-en h3 {
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  letter-spacing: 0.01em;
}

body.nav-open {
  overflow: hidden;
}

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

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.section {
  padding: clamp(5rem, 8vw, 8rem) 0;
}

.kicker {
  margin: 0 0 1rem;
  font-family: "Inter", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  color: var(--text-muted);
}

h1,
h2,
h3 {
  margin: 0;
}

h1,
h2 {
  font-family: "Noto Serif SC", "Times New Roman", serif;
  font-weight: 600;
  letter-spacing: 0.02em;
}

p {
  margin: 0;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 30;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, backdrop-filter 0.35s ease, border-color 0.35s ease;
}

.site-header.scrolled {
  background: rgba(10, 12, 15, 0.68);
  backdrop-filter: blur(10px);
  border-color: var(--line);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: "Inter", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 0.92rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  font-weight: 600;
}

.primary-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.primary-nav a {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--text-muted);
  transition: color 0.25s ease;
}

.primary-nav a:hover {
  color: var(--text);
}

.contact-pill {
  border: 1px solid rgba(183, 154, 107, 0.65);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  color: var(--text);
}

.lang-switch {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.48rem 0.75rem;
  color: rgba(245, 243, 238, 0.86);
}

.lang-switch:hover {
  border-color: rgba(183, 154, 107, 0.7);
  color: var(--text);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(16, 20, 26, 0.95);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 1px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 100svh;
  padding-top: calc(var(--header-h) + 4.5rem);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      112deg,
      rgba(7, 10, 14, 0.9) 6%,
      rgba(8, 11, 14, 0.74) 42%,
      rgba(7, 10, 14, 0.84) 100%
    ),
    url("./assets/images/hero-wave.jpg");
  background-size: cover;
  background-position: center;
  filter: brightness(0.48);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 74% 26%, rgba(183, 154, 107, 0.14), transparent 40%),
    linear-gradient(180deg, rgba(11, 13, 16, 0.25) 0%, rgba(11, 13, 16, 0.82) 100%),
    url("./assets/images/texture-wave.jpg");
  background-size: 120%, cover, cover;
  background-position: center;
  background-repeat: no-repeat;
  mix-blend-mode: screen;
  opacity: 0.28;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(680px, 90%);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 4.1rem);
  line-height: 1.15;
}

.cn-subtitle {
  margin-top: 0.75rem;
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: rgba(245, 243, 238, 0.9);
}

.hero-tagline {
  margin-top: 1.5rem;
  font-size: clamp(1.05rem, 2.1vw, 1.45rem);
  color: var(--text);
}

.hero-summary {
  margin-top: 1.4rem;
  max-width: 62ch;
  color: var(--text-muted);
  font-size: 1rem;
}

.hero-actions {
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.7rem 1.3rem;
  border-radius: 999px;
  font-family: "Inter", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid transparent;
  transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--accent);
  color: #15110a;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #c6aa79;
  border-color: #c6aa79;
}

.btn-secondary {
  border-color: var(--line);
  background: rgba(18, 22, 27, 0.4);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: rgba(183, 154, 107, 0.75);
  color: #f9efe0;
}

.split-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 6vw, 6rem);
}

.about h2 {
  font-size: clamp(1.9rem, 3.4vw, 3rem);
  margin-bottom: 1.3rem;
}

.lead {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.6vw, 1.16rem);
  max-width: 32ch;
}

.about .right {
  display: grid;
  gap: 1.25rem;
  color: var(--text-muted);
}

.about-visual {
  margin: 0 0 0.25rem;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #11151a;
  aspect-ratio: 4 / 5;
}

.about-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7) saturate(0.83);
  transition: transform 0.8s ease;
}

.about .right:hover .about-visual img {
  transform: scale(1.04);
}

.section-head {
  margin-bottom: 2.6rem;
}

.section-head h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.9rem);
}

.structure-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.structure-card {
  padding: 2rem;
  border-radius: 22px;
  background: linear-gradient(185deg, rgba(23, 28, 34, 0.9), rgba(16, 19, 24, 0.92));
  border: 1px solid var(--line);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.35s ease, border-color 0.35s ease;
}

.structure-card:hover {
  transform: translateY(-6px);
  border-color: rgba(183, 154, 107, 0.56);
}

.structure-card .index {
  font-family: "Inter", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  letter-spacing: 0.12em;
  color: rgba(183, 154, 107, 0.92);
  font-size: 0.9rem;
}

.structure-card h3 {
  font-family: "Noto Serif SC", "Times New Roman", serif;
  font-size: 1.35rem;
}

.structure-card p {
  color: var(--text-muted);
}

.philosophy {
  position: relative;
  text-align: center;
  isolation: isolate;
}

.philosophy::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(180deg, rgba(11, 13, 16, 0.78), rgba(11, 13, 16, 0.9)),
    url("./assets/images/terrain-lines.jpg");
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  opacity: 0.36;
  z-index: -1;
}

.philosophy h2 {
  font-size: clamp(1.9rem, 3.4vw, 3rem);
  margin-bottom: 1.4rem;
}

.philosophy-main {
  margin-inline: auto;
  max-width: 62ch;
  color: rgba(245, 243, 238, 0.86);
}

.philosophy-quote {
  margin: 1.5rem auto 0;
  font-family: "Inter", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: #d3bd96;
  font-size: 0.82rem;
}

.philosophy-cn {
  margin-top: 0.8rem;
  color: var(--text-muted);
}

.partnership {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.partnership::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(180deg, rgba(11, 13, 16, 0.74), rgba(11, 13, 16, 0.93)),
    url("./assets/images/partnership-ocean.jpg");
  background-size: cover;
  background-position: center;
  filter: brightness(0.44);
  opacity: 0.24;
  z-index: -1;
}

.partnership .container {
  position: relative;
  z-index: 1;
}

.partnership-grid {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
}

.partner-item {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  align-items: start;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.partner-item h3 {
  font-family: "Noto Serif SC", "Times New Roman", serif;
  font-size: 1.3rem;
}

.partner-item p {
  color: var(--text-muted);
  max-width: 60ch;
}

.contact {
  background: linear-gradient(180deg, rgba(18, 22, 27, 0.6), rgba(11, 13, 16, 0.95));
}

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.contact-intro h2 {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  margin-bottom: 1.2rem;
}

.contact-intro p {
  color: var(--text-muted);
}

.contact-actions {
  margin-top: 1.5rem;
  display: grid;
  gap: 0.7rem;
  justify-items: start;
}

.mail-btn {
  min-width: 220px;
}

.mail-note {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.contact-form {
  display: grid;
  gap: 0.75rem;
  padding: clamp(1.3rem, 2vw, 1.8rem);
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(21, 26, 32, 0.76);
}

.contact-form label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--text-muted);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(12, 16, 22, 0.75);
  color: var(--text);
  border-radius: 10px;
  padding: 0.72rem 0.84rem;
  font: inherit;
  outline: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: rgba(183, 154, 107, 0.9);
  box-shadow: 0 0 0 3px rgba(183, 154, 107, 0.17);
}

.submit-btn {
  margin-top: 0.55rem;
  width: 100%;
}

.site-footer {
  padding: 1.6rem 0 2rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
  color: var(--text-muted);
  text-align: center;
  font-size: 0.85rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (max-width: 980px) {
  .nav-toggle {
    display: inline-flex;
    z-index: 35;
  }

  .primary-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 80vw);
    height: 100svh;
    padding-top: calc(var(--header-h) + 1.3rem);
    background: rgba(12, 15, 20, 0.98);
    border-left: 1px solid var(--line);
    transition: right 0.35s ease;
  }

  .primary-nav.open {
    right: 0;
  }

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    padding: 0 1.4rem;
  }

  .primary-nav a {
    display: block;
    width: 100%;
    padding: 0.85rem 0;
  }

  .contact-pill {
    border-radius: 12px;
    padding: 0.7rem 0.85rem;
  }

  .lang-switch {
    border-radius: 10px;
    padding: 0.65rem 0.8rem;
  }

  .hero {
    min-height: 96svh;
    padding-top: calc(var(--header-h) + 3.5rem);
  }

  .split-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .about-visual {
    aspect-ratio: 16 / 10;
  }

  .structure-grid {
    grid-template-columns: 1fr;
  }

  .partner-item {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 4.4rem 0;
  }

  .hero-actions {
    width: 100%;
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .site-footer p {
    font-size: 0.75rem;
  }
}