/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: 'Noto Sans SC', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; font-size: 18px; line-height: 1.6; color: #333333; background-color: #FFFFFF; -webkit-font-smoothing: antialiased; }
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
:focus-visible { outline: 3px solid #D4AF37; outline-offset: 2px; }

/* ===== CSS VARIABLES ===== */
:root {
  --color-white: #FFFFFF;
  --color-gold: #D4AF37;
  --color-gold-light: #E8C55A;
  --color-gold-dark: #B8942E;
  --color-deep-blue: #003366;
  --color-deep-blue-light: #004488;
  --color-red: #E32636;
  --color-red-light: #F04050;
  --color-dark: #333333;
  --color-light-gray: #F5F5F5;
  --color-electric-blue: #00BFFF;
  --color-purple: #8A2BE2;
  --color-border: #E0E0E0;

  --font-heading: 'Impact', 'Arial Black', 'Franklin Gothic Heavy', sans-serif;
  --font-body: 'Noto Sans SC', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-accent: 'Courier New', monospace;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  --border-thick: 4px;
  --border-medium: 2px;
  --border-thin: 1px;
  --radius-none: 0;
  --radius-sm: 4px;
  --radius-pill: 9999px;

  --shadow-strong: 6px 6px 0 rgba(0,0,0,0.12);
  --shadow-medium: 4px 4px 0 rgba(0,0,0,0.08);
  --shadow-light: 2px 2px 0 rgba(0,0,0,0.04);
  --shadow-gold: 0 4px 20px rgba(212,175,55,0.25);

  --container-max: 1280px;
  --container-narrow: 880px;
  --container-wide: 100%;

  --header-height: 72px;
  --header-z: 1000;
  --progress-z: 1001;

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 900; line-height: 1.1; color: var(--color-deep-blue); }
h1 { font-size: clamp(2.5rem, 6vw, 4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }
p { margin-bottom: 1em; }
small, .text-small { font-size: 0.875rem; }
.text-caption { font-size: 0.75rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--color-deep-blue); font-family: var(--font-accent); }
.text-gold { color: var(--color-gold); }
.text-red { color: var(--color-red); }
.text-blue { color: var(--color-deep-blue); }
.text-electric { color: var(--color-electric-blue); }
.text-vertical { writing-mode: vertical-rl; text-orientation: mixed; font-size: 0.75rem; letter-spacing: 0.1em; font-family: var(--font-accent); }

/* ===== CONTAINER ===== */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-lg); }
.container--narrow { max-width: var(--container-narrow); }
.container--wide { max-width: var(--container-wide); padding: 0 var(--space-xl); }

/* ===== SECTION ===== */
.section { padding: var(--space-3xl) 0; }
.section--wide { padding: var(--space-4xl) 0; }
.section--narrow { padding: var(--space-xl) 0; }
.section--light { background-color: var(--color-light-gray); }
.section--blue { background-color: var(--color-deep-blue); color: var(--color-white); }
.section--dark { background-color: var(--color-dark); color: var(--color-white); }
.section--grid-bg { background-image: linear-gradient(rgba(0,191,255,0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(0,191,255,0.06) 1px, transparent 1px); background-size: 40px 40px; }

/* ===== SKIP LINK ===== */
.skip-link { position: absolute; top: -1000px; left: var(--space-md); padding: var(--space-sm) var(--space-md); background: var(--color-deep-blue); color: var(--color-white); font-size: 0.875rem; z-index: var(--progress-z); border-radius: var(--radius-sm); transition: top var(--transition-fast); }
.skip-link:focus { top: var(--space-sm); }

/* ===== HEADER ===== */
.site-header { position: fixed; top: 0; left: 0; width: 100%; height: var(--header-height); z-index: var(--header-z); background: transparent; pointer-events: none; }
.site-header .header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-lg); pointer-events: auto; }

.brand { display: flex; align-items: center; }
.brand-link { display: flex; flex-direction: column; line-height: 1.1; padding: var(--space-xs) var(--space-md); background: rgba(255,255,255,0.92); border: var(--border-medium) solid var(--color-gold); border-radius: var(--radius-sm); box-shadow: var(--shadow-strong); transition: box-shadow var(--transition-fast), transform var(--transition-fast); }
.brand-link:hover { box-shadow: var(--shadow-gold); transform: translate(-1px, -1px); }
.brand-name { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 900; color: var(--color-deep-blue); letter-spacing: 0.02em; }
.brand-badge { font-size: 0.65rem; font-family: var(--font-accent); color: var(--color-gold-dark); letter-spacing: 0.15em; text-transform: uppercase; }

.main-nav { display: flex; align-items: center; background: rgba(255,255,255,0.92); border: var(--border-medium) solid var(--color-gold); border-radius: var(--radius-pill); padding: var(--space-xs) var(--space-sm); box-shadow: var(--shadow-strong); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.nav-list { display: flex; align-items: center; gap: var(--space-xs); }
.nav-link { display: block; padding: var(--space-sm) var(--space-md); font-size: 0.875rem; font-weight: 600; color: var(--color-deep-blue); border-radius: var(--radius-pill); transition: all var(--transition-fast); position: relative; white-space: nowrap; }
.nav-link::after { content: ''; position: absolute; bottom: 2px; left: 50%; width: 0; height: 2px; background: var(--color-gold); transform: translateX(-50%); transition: width var(--transition-base); border-radius: 1px; }
.nav-link:hover { color: var(--color-gold-dark); }
.nav-link:hover::after { width: 60%; }
.nav-link[aria-current="page"] { color: var(--color-red); font-weight: 700; }
.nav-link[aria-current="page"]::after { width: 70%; background: var(--color-red); }

.nav-toggle { display: none; flex-direction: column; justify-content: center; align-items: center; width: 44px; height: 44px; padding: var(--space-sm); background: rgba(255,255,255,0.92); border: var(--border-medium) solid var(--color-gold); border-radius: 50%; box-shadow: var(--shadow-strong); cursor: pointer; }
.toggle-line { display: block; width: 20px; height: 2px; background: var(--color-deep-blue); border-radius: 1px; transition: all var(--transition-fast); }
.toggle-line + .toggle-line { margin-top: 5px; }
.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

@media (max-width: 900px) {
  .main-nav { position: fixed; top: var(--header-height); left: var(--space-md); right: var(--space-md); background: rgba(255,255,255,0.97); border-radius: var(--radius-sm); padding: var(--space-md); box-shadow: var(--shadow-strong); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all var(--transition-base); border: var(--border-thick) solid var(--color-deep-blue); }
  .main-nav[data-open] { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav-list { flex-direction: column; width: 100%; gap: var(--space-xs); }
  .nav-link { width: 100%; text-align: center; padding: var(--space-sm) var(--space-md); font-size: 1rem; border-radius: var(--radius-sm); }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { background: var(--color-deep-blue); color: var(--color-white); }
  .nav-toggle { display: flex; }
  .brand-name { font-size: 1.25rem; }
  .header-inner { padding: 0 var(--space-md); }
}

@media (max-width: 480px) {
  .brand-badge { display: none; }
  .brand-link { padding: var(--space-xs) var(--space-sm); }
  .brand-name { font-size: 1.1rem; }
  .main-nav { left: var(--space-sm); right: var(--space-sm); }
}

/* ===== FOOTER ===== */
.site-footer { background: var(--color-deep-blue); color: rgba(255,255,255,0.9); border-top: var(--border-thick) solid var(--color-gold); position: relative; }
.site-footer::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--color-gold), transparent 60%); }
.footer-inner { max-width: var(--container-max); margin: 0 auto; padding: var(--space-2xl) var(--space-lg) var(--space-xl); }
.footer-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-lg); padding-bottom: var(--space-lg); border-bottom: 1px solid rgba(212,175,55,0.25); }
.footer-brand { display: flex; flex-direction: column; gap: var(--space-xs); }
.footer-brand-name { font-family: var(--font-heading); font-size: 1.75rem; font-weight: 900; color: var(--color-gold); letter-spacing: 0.02em; }
.footer-brand-badge { font-size: 0.8rem; color: rgba(255,255,255,0.7); letter-spacing: 0.08em; font-family: var(--font-accent); }
.footer-partner { display: flex; align-items: center; gap: var(--space-sm); }
.partner-badge { display: inline-block; padding: var(--space-xs) var(--space-md); border: var(--border-thin) solid var(--color-gold); border-radius: var(--radius-sm); font-size: 0.7rem; font-family: var(--font-accent); letter-spacing: 0.12em; color: var(--color-gold); text-transform: uppercase; background: rgba(212,175,55,0.08); }

.footer-mid { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-lg); padding: var(--space-lg) 0; border-bottom: 1px solid rgba(212,175,55,0.15); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-lg); }
.footer-link { font-size: 0.875rem; color: rgba(255,255,255,0.75); transition: color var(--transition-fast); position: relative; padding-bottom: 2px; }
.footer-link::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 1px; background: var(--color-gold); transition: width var(--transition-base); }
.footer-link:hover { color: var(--color-gold); }
.footer-link:hover::after { width: 100%; }

.footer-contact { display: flex; flex-wrap: wrap; gap: var(--space-lg); }
.contact-item { font-size: 0.8rem; color: rgba(255,255,255,0.6); font-family: var(--font-accent); letter-spacing: 0.02em; }

.footer-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-md); padding-top: var(--space-lg); }
.footer-icp { font-size: 0.75rem; color: rgba(255,255,255,0.4); font-family: var(--font-accent); }
.footer-copyright { font-size: 0.75rem; color: rgba(255,255,255,0.4); font-family: var(--font-accent); }

@media (max-width: 768px) {
  .footer-top { flex-direction: column; align-items: flex-start; }
  .footer-mid { flex-direction: column; align-items: flex-start; }
  .footer-links { gap: var(--space-md); }
  .footer-contact { flex-direction: column; gap: var(--space-sm); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-brand-name { font-size: 1.5rem; }
}

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-sm); padding: var(--space-sm) var(--space-xl); font-family: var(--font-heading); font-size: 1rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; border: var(--border-medium) solid transparent; transition: all var(--transition-fast); cursor: pointer; position: relative; }
.btn--gold { background: var(--color-gold); color: var(--color-deep-blue); border-color: var(--color-gold-dark); box-shadow: var(--shadow-strong); }
.btn--gold:hover { background: var(--color-gold-light); transform: translate(-2px, -2px); box-shadow: var(--shadow-gold); }
.btn--red { background: var(--color-red); color: var(--color-white); border-color: var(--color-red); box-shadow: var(--shadow-strong); }
.btn--red:hover { background: var(--color-red-light); transform: translate(-2px, -2px); }
.btn--outline { background: transparent; color: var(--color-deep-blue); border-color: var(--color-deep-blue); box-shadow: none; }
.btn--outline:hover { background: var(--color-deep-blue); color: var(--color-white); }
.btn--small { padding: var(--space-xs) var(--space-md); font-size: 0.75rem; }
.btn--large { padding: var(--space-md) var(--space-2xl); font-size: 1.125rem; }

/* ===== BREADCRUMB ===== */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-sm); padding: var(--space-md) 0; font-size: 0.8rem; font-family: var(--font-accent); color: var(--color-dark); }
.breadcrumb a { color: var(--color-deep-blue); text-decoration: underline; text-underline-offset: 2px; text-decoration-color: rgba(0,51,102,0.3); }
.breadcrumb a:hover { color: var(--color-gold-dark); }
.breadcrumb span { color: rgba(51,51,51,0.5); }
.breadcrumb .sep { margin: 0 var(--space-xs); color: rgba(51,51,51,0.3); }

/* ===== GRID ===== */
.grid { display: grid; grid-template-columns: 1fr; gap: var(--space-lg); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ===== CARD ===== */
.card { background: var(--color-white); border: var(--border-thick) solid var(--color-deep-blue); box-shadow: var(--shadow-strong); transition: transform var(--transition-fast), box-shadow var(--transition-fast); position: relative; }
.card:hover { transform: translate(-2px, -2px); box-shadow: 8px 8px 0 rgba(0,0,0,0.15); }
.card--gold { border-color: var(--color-gold); }
.card--red { border-color: var(--color-red); }
.card--flat { box-shadow: none; }
.card--flat:hover { transform: none; box-shadow: none; }
.card__header { padding: var(--space-md) var(--space-lg); border-bottom: var(--border-thin) solid var(--color-border); display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); }
.card__header h3, .card__header h4 { margin: 0; }
.card__body { padding: var(--space-lg); }
.card__footer { padding: var(--space-md) var(--space-lg); border-top: var(--border-thin) solid var(--color-border); font-size: 0.875rem; color: rgba(51,51,51,0.6); }
.card__index { font-family: var(--font-accent); font-size: 0.7rem; color: var(--color-electric-blue); letter-spacing: 0.08em; }

/* ===== TAG ===== */
.tag { display: inline-block; padding: var(--space-xs) var(--space-sm); font-size: 0.7rem; font-family: var(--font-accent); letter-spacing: 0.06em; text-transform: uppercase; border: var(--border-thin) solid currentColor; border-radius: var(--radius-sm); }
.tag--gold { color: var(--color-gold-dark); border-color: var(--color-gold); }
.tag--red { color: var(--color-red); border-color: var(--color-red); }
.tag--blue { color: var(--color-deep-blue); border-color: var(--color-deep-blue); }
.tag--electric { color: var(--color-electric-blue); border-color: var(--color-electric-blue); }

/* ===== PROGRESS BAR ===== */
.progress-bar { position: fixed; top: 0; left: 0; width: 0%; height: 3px; background: linear-gradient(90deg, var(--color-gold), var(--color-red)); z-index: var(--progress-z); transition: width 0.1s linear; pointer-events: none; }
@media (prefers-reduced-motion: reduce) { .progress-bar { display: none; } }

/* ===== IMAGE CONTAINER ===== */
.img-container { position: relative; overflow: hidden; background: var(--color-light-gray); border: var(--border-medium) solid var(--color-border); }
.img-container--ratio-16-9 { aspect-ratio: 16 / 9; }
.img-container--ratio-4-3 { aspect-ratio: 4 / 3; }
.img-container--ratio-1-1 { aspect-ratio: 1 / 1; }
.img-container--ratio-3-4 { aspect-ratio: 3 / 4; }
.img-container img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; }
.img-container__placeholder { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; color: rgba(0,0,0,0.15); font-family: var(--font-accent); font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; }

/* ===== UTILITY ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.flex-center { align-items: center; justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

/* ===== TECH BLUEPRINT DECOR ===== */
.blueprint-line { position: relative; }
.blueprint-line::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: repeating-linear-gradient(90deg, var(--color-electric-blue) 0, var(--color-electric-blue) 8px, transparent 8px, transparent 16px); opacity: 0.15; }
.coord-label { font-family: var(--font-accent); font-size: 0.6rem; color: var(--color-electric-blue); letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.5; }

/* ===== CAROUSEL / FILTER TOGGLE (shared) ===== */
.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-sm); padding: var(--space-md) 0; }
.filter-btn { padding: var(--space-xs) var(--space-md); font-size: 0.75rem; font-family: var(--font-accent); text-transform: uppercase; letter-spacing: 0.06em; border: var(--border-thin) solid var(--color-border); background: var(--color-white); color: var(--color-dark); transition: all var(--transition-fast); cursor: pointer; }
.filter-btn:hover { border-color: var(--color-gold); color: var(--color-gold-dark); }
.filter-btn[data-active] { background: var(--color-deep-blue); color: var(--color-white); border-color: var(--color-deep-blue); }

/* ===== MAIN CONTENT ANCHOR ===== */
#main-content { scroll-margin-top: calc(var(--header-height) + var(--space-lg)); }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  body { font-size: 16px; }
  :root { --header-height: 64px; }
  .container { padding: 0 var(--space-md); }
  .section { padding: var(--space-2xl) 0; }
  .section--wide { padding: var(--space-3xl) 0; }
  h1 { font-size: clamp(2rem, 8vw, 2.5rem); }
  h2 { font-size: clamp(1.5rem, 6vw, 2rem); }
}