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

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

body {
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.7;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

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

ul[class],
ol[class] {
  list-style: none;
  padding: 0;
  margin: 0;
}

a {
  color: inherit;
}

:root {
  --color-bg: #F5F1E8;
  --color-bg-deep: #0B1D3A;
  --color-panel: #FFFFFF;
  --color-ink: #241F1B;
  --color-dim: #3A5A8C;
  --color-line: #C8C0B8;
  --color-acid: #00E68A;
  --color-orange: #FF6B35;
  --color-on-deep: #F5F1E8;
  --font-head: "Oswald", "Arial Narrow", Impact, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --container: 1200px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --header-h: 64px;
  --scroll: 0%;
}

.theme-dark {
  --color-bg: #0B1D3A;
  --color-panel: #14243F;
  --color-ink: #F5F1E8;
  --color-dim: #7F9FC7;
  --color-line: #2B4A72;
}

/* ========== Accessibility ========== */
:focus-visible {
  outline: 2px dashed var(--color-orange);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 2000;
  padding: 0.6rem 1.2rem;
  background: var(--color-acid);
  color: #0B1D3A;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.skip-link:focus {
  top: 1rem;
}

/* ========== Header / Commandbar ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-bg-deep);
  color: var(--color-on-deep);
}

.commandbar {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-on-deep);
}

.brand-mark {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  padding: 0.25rem 0.4rem;
  background: var(--color-acid);
  color: #0B1D3A;
  clip-path: polygon(0 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.brand-name-en {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--color-acid);
  text-transform: uppercase;
}

.main-nav {
  justify-self: center;
}

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

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.55rem 0.7rem;
  font-family: var(--font-head);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: rgba(245, 241, 232, 0.78);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.nav-link:hover {
  color: var(--color-acid);
}

.nav-link[aria-current="page"] {
  color: var(--color-acid);
  border-bottom-color: var(--color-acid);
  background: linear-gradient(to top, rgba(0, 230, 138, 0.14), transparent 70%);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-orange);
}

.command-tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.quickfind {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.5rem;
  border-bottom: 1px solid rgba(245, 241, 232, 0.3);
  transition: border-color 0.2s ease;
}

.quickfind:focus-within {
  border-bottom-color: var(--color-acid);
}

.quickfind-icon {
  color: var(--color-acid);
  font-size: 1.05rem;
  line-height: 1;
}

.quickfind-input {
  width: 86px;
  padding: 0.2rem 0;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-on-deep);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.quickfind-input::placeholder {
  color: rgba(245, 241, 232, 0.4);
}

.theme-toggle {
  width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid rgba(245, 241, 232, 0.2);
  color: var(--color-acid);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--color-acid);
  background: rgba(0, 230, 138, 0.08);
}

.theme-toggle-dot {
  display: inline-block;
  font-family: var(--font-mono);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 2.2rem;
  height: 2.2rem;
  background: transparent;
  border: 1px solid rgba(245, 241, 232, 0.2);
  cursor: pointer;
  transition: border-color 0.2s ease;
}

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

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-acid);
  transition: transform 0.2s ease, background 0.2s ease;
}

.commandbar-gauge {
  display: flex;
  height: 3px;
  background: rgba(245, 241, 232, 0.08);
}

.commandbar-gauge-acid {
  width: var(--scroll);
  background: var(--color-acid);
  transition: width 0.15s ease-out;
}

.commandbar-gauge-orange {
  flex: 1;
  background: var(--color-orange);
}

/* ========== Footer ========== */
.site-footer {
  position: relative;
  margin-top: clamp(3.5rem, 10vw, 6rem);
  padding-top: clamp(3rem, 8vw, 6rem);
  background: var(--color-bg-deep);
  color: var(--color-on-deep);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(135deg, var(--color-acid) 0 16px, var(--color-orange) 16px 24px, var(--color-bg-deep) 24px 32px);
}

.footer-statement {
  max-width: var(--container);
  margin-inline: auto;
  padding: 1.25rem var(--gutter);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-left: 4px solid var(--color-orange);
}

.footer-statement-tag {
  flex: none;
  padding: 0.25rem 0.6rem;
  background: var(--color-orange);
  color: #0B1D3A;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-statement p {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(245, 241, 232, 0.72);
}

.footer-grid {
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4rem) var(--gutter) 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

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

.footer-brand-name {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--color-on-deep);
}

.footer-desc {
  max-width: 34em;
  font-size: 0.85rem;
  color: rgba(245, 241, 232, 0.6);
  line-height: 1.8;
}

.footer-badge {
  display: inline-block;
  margin-top: 0.9rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--color-acid);
  color: var(--color-acid);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
}

.footer-title {
  margin-bottom: 1rem;
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-acid);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 0.6rem;
}

.footer-links a {
  color: rgba(245, 241, 232, 0.75);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-contact-list {
  list-style: none;
  display: grid;
  gap: 0.65rem;
  font-size: 0.85rem;
  color: rgba(245, 241, 232, 0.75);
}

.contact-label {
  display: block;
  margin-bottom: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-orange);
}

.footer-bottom {
  padding: 1.5rem var(--gutter) 2.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(245, 241, 232, 0.5);
}

/* ========== Layout / Sections ========== */
.l-container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.l-section {
  padding-block: clamp(2.5rem, 7vw, 5rem);
}

.l-section-tight {
  padding-block: 1.5rem;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.15;
  text-transform: uppercase;
}

.section-more {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 0.1rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.section-more:hover {
  color: var(--color-orange);
  border-color: var(--color-orange);
}

.page-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.intro {
  max-width: 68ch;
  color: var(--color-dim);
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.9;
}

.prose {
  max-width: 68ch;
  line-height: 1.85;
}

.prose p + p {
  margin-top: 1.25rem;
}

/* ========== Grids ========== */
.grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.grid-2,
.grid-3,
.grid-4 {
  grid-template-columns: 1fr;
}

/* ========== Cards ========== */
.card {
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  padding: clamp(1.25rem, 3vw, 2rem);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--color-acid);
  box-shadow: 8px 8px 0 var(--color-bg-deep);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.5rem;
  padding: 0.5rem 1.25rem;
  border: 2px solid transparent;
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

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

.btn-primary {
  background: var(--color-acid);
  color: #0B1D3A;
}

.btn-primary:hover {
  background: var(--color-orange);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-acid);
  color: var(--color-acid);
}

.btn-ghost:hover {
  background: var(--color-acid);
  color: #0B1D3A;
}

/* ========== Tags ========== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border: 1px solid var(--color-line);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.tag:hover,
.tag.is-active {
  background: var(--color-bg-deep);
  color: var(--color-on-deep);
  border-color: var(--color-bg-deep);
}

/* ========== Breadcrumbs ========== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--color-dim);
}

.breadcrumbs a {
  color: var(--color-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumbs a:hover {
  color: var(--color-orange);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-ink);
}

/* ========== Media frames ========== */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-deep);
}

.media-frame::before {
  content: attr(data-label);
  position: absolute;
  left: 0.75rem;
  bottom: 0.5rem;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--color-acid);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(0, 0, 0, 0.18), transparent 55%);
  pointer-events: none;
}

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

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

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

.media-21x9 {
  aspect-ratio: 21 / 9;
}

/* ========== Data rows ========== */
.data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 0.9rem;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-bg-deep);
}

/* ========== Reveal / States ========== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
}

html.js [data-reveal="in"] {
  opacity: 1;
  transform: none;
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

.nav-open {
  overflow: hidden;
}

/* ========== Responsive ========== */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .quickfind-input {
    display: none;
  }

  .quickfind-icon {
    font-size: 1.3rem;
  }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: var(--color-bg-deep);
    padding: 2rem var(--gutter);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0.3s ease;
  }

  .main-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
  }

  .nav-link {
    padding: 0.9rem 0.75rem;
    font-size: 1.1rem;
    border-bottom: 1px solid rgba(245, 241, 232, 0.08);
  }

  .nav-link[aria-current="page"] {
    border-bottom: 2px solid var(--color-acid);
  }

  .nav-index {
    font-size: 0.7rem;
  }
}

@media (min-width: 640px) {
  .grid-2,
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 960px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1.2fr 1.6fr;
  }
}

/* ========== Reduced Motion ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal],
  html.js [data-reveal="in"] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}