/* ===== Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  min-height: 100vh;
}

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

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

ol,
ul {
  list-style: none;
}

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

/* ===== Variables ===== */
:root {
  --c-night: #0B1F33;
  --c-green: #2D6A4F;
  --c-mint: #00D4AA;
  --c-neon: #8A2BE2;
  --c-amber: #FF9E00;
  --c-cream: #F5F1E8;
  --c-ink: #2B201A;
  --c-slate: #355570;
  --c-dark: #1A1410;

  --font-headline: "Space Grotesk", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Serif Pro", "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-data: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 10px;

  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-glow-mint: 0 0 18px rgba(0, 212, 170, 0.25);
  --shadow-glow-neon: 0 0 20px rgba(138, 43, 226, 0.35);

  --content-max: 1230px;
}

/* ===== Base ===== */
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-ink);
  background: var(--c-cream);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-night);
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(1.75rem, 3.6vw, 2.75rem);
}

h3 {
  font-size: clamp(1.25rem, 2.2vw, 1.625rem);
}

h4 {
  font-size: 1.1rem;
}

p {
  margin-bottom: 1em;
}

a {
  transition: color 0.2s ease;
}

code,
kbd,
samp {
  font-family: var(--font-data);
  font-size: 0.9em;
}

::selection {
  background: var(--c-neon);
  color: var(--c-cream);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--c-cream);
}

::-webkit-scrollbar-thumb {
  background: var(--c-green);
  border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-night);
}

/* ===== Focus ===== */
:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 2px;
}

/* ===== Container / Layout ===== */
.container {
  width: min(var(--content-max), 100% - 2rem);
  margin-inline: auto;
}

.main-content {
  min-height: 70vh;
}

#main-content:focus {
  outline: none;
}

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-3);
  z-index: 200;
  background: var(--c-amber);
  color: var(--c-ink);
  padding: 0.6rem 1.25rem;
  font-family: var(--font-data);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-soft);
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 0;
}

/* ===== Scroll Progress ===== */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--c-mint), var(--c-neon) 60%, var(--c-amber));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 5;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-night);
  color: var(--c-cream);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.22);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--c-mint), var(--c-neon) 60%, var(--c-amber));
}

.header-inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: min(var(--content-max), 100% - 2rem);
  margin-inline: auto;
  padding-block: 0.65rem;
}

/* ===== Brand ===== */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex: 0 0 auto;
  color: inherit;
  text-decoration: none;
}

.brand-symbol {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--c-green);
  color: var(--c-cream);
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 75%, 75% 100%, 0 100%);
  box-shadow: 0 0 12px rgba(0, 212, 170, 0.25);
}

.brand-copy {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-headline);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-cream);
}

.brand-region {
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--c-mint);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* ===== Nav ===== */
.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  list-style: none;
  counter-reset: nav-index;
}

.nav-item {
  counter-increment: nav-index;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 0.7rem;
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  color: rgba(245, 241, 232, 0.75);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link::before {
  content: counter(nav-index, decimal-leading-zero);
  font-size: 0.65rem;
  color: var(--c-mint);
  opacity: 0.8;
}

.nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0.7rem;
  bottom: 0.15rem;
  height: 2px;
  background: linear-gradient(90deg, var(--c-mint), var(--c-neon));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--c-cream);
  background: rgba(0, 212, 170, 0.08);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ===== Header CTA ===== */
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--c-amber);
  color: var(--c-ink);
  font-family: var(--font-data);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.header-cta:hover {
  background: var(--c-neon);
  color: #fff;
  box-shadow: var(--shadow-glow-neon);
}

.cta-arrow {
  transition: transform 0.2s ease;
}

.header-cta:hover .cta-arrow {
  transform: translateX(3px);
}

/* ===== Nav Toggle ===== */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid rgba(0, 212, 170, 0.3);
  border-radius: var(--radius-sm);
  color: var(--c-cream);
  font-family: var(--font-data);
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--c-mint);
}

.nav-toggle-icon {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: var(--c-mint);
  transition: transform 0.2s ease, opacity 0.2s 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);
}

/* ===== Mobile Header ===== */
@media (max-width: 920px) {
  .header-inner {
    flex-wrap: wrap;
  }

  .brand {
    flex: 1 1 auto;
  }

  .header-cta {
    display: none;
  }

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

  .site-nav {
    order: 3;
    flex: 1 1 100%;
    margin-left: 0;
    display: none;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 0;
  }

  .nav-item + .nav-item {
    border-top: 1px solid rgba(0, 212, 170, 0.1);
  }

  .nav-link {
    display: flex;
    padding: 0.9rem 1rem;
    font-size: 0.9rem;
  }
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  background: var(--c-dark);
  color: rgba(245, 241, 232, 0.72);
  font-size: 0.95rem;
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--c-mint), var(--c-neon) 60%, var(--c-amber));
}

.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1.1fr;
  gap: var(--space-6);
  padding-block: var(--space-6);
}

.footer-brand {
  max-width: 42em;
}

.footer-logo {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-cream);
  letter-spacing: 0.02em;
}

.footer-brief {
  margin-top: 0.75rem;
  color: rgba(245, 241, 232, 0.68);
}

.footer-trust {
  margin-top: 1rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--c-amber);
  color: rgba(245, 241, 232, 0.55);
  font-size: 0.85rem;
}

.footer-column {
  min-width: 0;
}

.footer-heading {
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-mint);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: rgba(245, 241, 232, 0.72);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--c-amber);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.footer-label {
  display: block;
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: rgba(0, 212, 170, 0.6);
  letter-spacing: 0.05em;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-block: 1.25rem;
  border-top: 1px solid rgba(245, 241, 232, 0.08);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: rgba(245, 241, 232, 0.4);
}

.footer-icp {
  white-space: nowrap;
}

@media (max-width: 920px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-data);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.22s ease, color 0.22s ease, box-shadow 0.22s ease, transform 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--c-amber);
  color: var(--c-ink);
}

.btn--primary:hover {
  background: var(--c-neon);
  color: #fff;
  box-shadow: var(--shadow-glow-neon);
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--c-mint);
  color: var(--c-mint);
}

.btn--ghost:hover {
  border-color: var(--c-mint);
  background: rgba(0, 212, 170, 0.1);
  box-shadow: var(--shadow-glow-mint);
}

/* ===== Tags ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  background: var(--c-green);
  color: var(--c-cream);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  border-radius: 999px;
  white-space: nowrap;
}

.tag--amber {
  background: var(--c-amber);
  color: var(--c-ink);
}

.tag--neon {
  background: var(--c-neon);
  color: #fff;
}

.tag--outline {
  background: transparent;
  border: 1px solid var(--c-mint);
  color: var(--c-mint);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--c-slate);
  margin-bottom: var(--space-3);
}

.breadcrumb a {
  color: var(--c-slate);
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--c-mint);
}

.breadcrumb__sep {
  color: rgba(53, 85, 112, 0.5);
}

/* ===== Section ===== */
.section {
  padding-block: var(--space-6);
}

.section--tight {
  padding-block: var(--space-4);
}

.section--flat {
  padding-block: 0;
}

.section--night {
  background: var(--c-night);
  color: rgba(245, 241, 232, 0.85);
}

.section--night h1,
.section--night h2,
.section--night h3 {
  color: var(--c-cream);
}

.section--green {
  background: var(--c-green);
  color: rgba(245, 241, 232, 0.9);
}

.section--green h1,
.section--green h2,
.section--green h3 {
  color: var(--c-cream);
}

.section--dark {
  background: var(--c-dark);
  color: rgba(245, 241, 232, 0.8);
}

.section--dark h1,
.section--dark h2,
.section--dark h3 {
  color: var(--c-cream);
}

/* ===== Page Intro ===== */
.page-intro {
  padding-block: var(--space-6);
  border-bottom: 1px solid rgba(43, 32, 26, 0.08);
}

.page-title {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  max-width: 12em;
}

.page-subtitle {
  max-width: 45em;
  margin-top: var(--space-3);
  font-size: 1.1rem;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: var(--space-4);
}

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

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

@media (max-width: 820px) {
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .grid--2 {
    grid-template-columns: 1fr;
  }
}

/* ===== Panel ===== */
.panel {
  background: rgba(245, 241, 232, 0.9);
  border: 1px solid rgba(43, 32, 26, 0.08);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-soft);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.panel:hover {
  box-shadow: 0 8px 24px rgba(11, 31, 51, 0.12);
  transform: translateY(-2px);
}

/* ===== Data Row / Table ===== */
.data-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(43, 32, 26, 0.08);
}

.data-row:last-child {
  border-bottom: none;
}

.data-row__label {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--c-slate);
}

.data-row__value {
  font-family: var(--font-data);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-night);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: 0.88rem;
}

.data-table th,
.data-table td {
  padding: 0.75rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid rgba(43, 32, 26, 0.08);
}

.data-table th {
  color: var(--c-slate);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ===== Expander ===== */
.expander {
  border-bottom: 1px solid rgba(43, 32, 26, 0.08);
}

.expander__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-night);
}

.expander__trigger:hover .expander__icon {
  color: var(--c-neon);
}

.expander__icon {
  display: inline-flex;
  font-family: var(--font-data);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--c-mint);
  transition: color 0.2s ease, transform 0.3s ease;
}

.expander[data-open] .expander__icon {
  transform: rotate(45deg);
}

.expander__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.expander__inner {
  overflow: hidden;
  padding-bottom: 0;
  color: var(--c-slate);
  line-height: 1.65;
}

.expander[data-open] .expander__panel {
  grid-template-rows: 1fr;
}

.expander[data-open] .expander__inner {
  padding-bottom: 1.25rem;
}

/* ===== Horizontal Scroll ===== */
.hscroll {
  display: flex;
  gap: var(--space-4);
  overflow-x: auto;
  padding-bottom: 0.75rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.hscroll > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

/* ===== Media Frame ===== */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-night);
  border-radius: var(--radius-sm);
}

.media-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.media-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.media-frame--3x2 {
  aspect-ratio: 3 / 2;
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(11, 31, 51, 0.55) 0%, transparent 60%);
  pointer-events: none;
}

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: rgba(0, 212, 170, 0.8);
  background:
    linear-gradient(30deg, transparent 0%, rgba(0, 212, 170, 0.08) 40%, transparent 60%),
    repeating-linear-gradient(-45deg, transparent 0 12px, rgba(0, 212, 170, 0.03) 12px 13px);
}

/* ===== Extra Components ===== */
.notice {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-sm);
  background: rgba(255, 158, 0, 0.08);
  border-left: 3px solid var(--c-amber);
  color: var(--c-ink);
  font-size: 0.95rem;
}

.blockquote {
  padding: var(--space-4) var(--space-5);
  border-left: 3px solid var(--c-neon);
  font-family: var(--font-headline);
  font-size: 1.125rem;
  line-height: 1.35;
  color: var(--c-night);
  background: rgba(138, 43, 226, 0.04);
}

.input {
  display: block;
  width: 100%;
  padding: 0.65rem 1rem;
  font-family: var(--font-data);
  font-size: 0.9rem;
  border: 1px solid rgba(53, 85, 112, 0.25);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--c-ink);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input:focus-visible {
  outline: none;
  border-color: var(--c-mint);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.15);
}

/* ===== Reduced Motion ===== */
@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;
    scroll-behavior: auto !important;
  }

  .panel:hover {
    transform: none;
  }
}