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

:root {
  --c-ink: #0A0C0E;
  --c-paper: #F4F5F0;
  --c-orange: #FF3B14;
  --c-lime: #C6FF3D;
  --c-space: #23272B;
  --c-gray: #5B6168;
  --c-line: #D8DCDA;
  --c-white-glass: rgba(255, 255, 255, 0.78);
  --c-black-glass: rgba(10, 12, 14, 0.72);
  --c-alert: #FF4D5A;

  --font-display: "Noto Sans SC Black", "Impact", sans-serif;
  --font-body: "Montserrat", "Noto Sans SC", sans-serif;
  --font-data: "IBM Plex Mono", "SFMono-Regular", monospace;

  --w-container: 1240px;
  --pad-mobile: 20px;
  --pad-tablet: 32px;
  --pad-desktop: 48px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --speed: 0.25s;

  --header-h: 72px;
  --footer-top-border: 3px solid var(--c-orange);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
}

body {
  font-family: var(--font-body);
  background: var(--c-ink);
  color: var(--c-paper);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
  background: var(--c-paper);
  color: var(--c-ink);
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--c-lime);
  outline-offset: 3px;
}

/* ========== Utility Classes ========== */
.site-container {
  max-width: var(--w-container);
  margin: 0 auto;
  padding-left: var(--pad-mobile);
  padding-right: var(--pad-mobile);
}

@media (min-width: 768px) {
  .site-container {
    padding-left: var(--pad-tablet);
    padding-right: var(--pad-tablet);
  }
}

@media (min-width: 1024px) {
  .site-container {
    padding-left: var(--pad-desktop);
    padding-right: var(--pad-desktop);
  }
}

/* ========== Buttons ========== */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  padding: 0.875rem 1.6rem;
  border-radius: 4px;
  text-align: center;
  transition: transform var(--speed) var(--ease-out), box-shadow var(--speed) var(--ease-out), background-color var(--speed) var(--ease-out), color var(--speed) var(--ease-out);
  border: 2px solid transparent;
}

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

.btn--primary:hover {
  background-color: var(--c-lime);
  color: var(--c-ink);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255, 59, 20, 0.3);
}

.btn--outline {
  border-color: var(--c-line);
  color: var(--c-ink);
}

.btn--outline:hover {
  border-color: var(--c-orange);
  color: var(--c-orange);
  transform: translateY(-2px);
}

/* ========== Status & Chips ========== */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-lime);
  margin-right: 6px;
  vertical-align: middle;
  box-shadow: 0 0 8px rgba(198, 255, 61, 0.65);
}

.score-chip {
  display: inline-block;
  background: var(--c-orange);
  color: var(--c-paper);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
}

/* ========== Breadcrumbs ========== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--c-gray);
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

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

.breadcrumbs__sep {
  opacity: 0.5;
}

/* ========== Header ========== */
.site-header {
  background: var(--c-black-glass);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  position: relative;
  z-index: 50;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-orange) 40%, rgba(255, 255, 255, 0.1) 100%);
}

.header-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  min-height: var(--header-h);
  gap: 16px 24px;
  padding-top: 12px;
  padding-bottom: 12px;
  position: relative;
}

.brand-mark {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  padding-right: 16px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  transition: opacity var(--speed) ease;
}

.brand-mark:hover {
  opacity: 0.8;
}

.brand-mark__name {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--c-paper);
  letter-spacing: 0.02em;
}

.brand-mark__code {
  font-family: var(--font-data);
  font-size: 0.625rem;
  color: var(--c-line);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.7;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  background: var(--c-lime);
  color: var(--c-ink);
  font-weight: 700;
  padding: 12px 20px;
  border-radius: 0 0 6px 6px;
  transition: top var(--speed) var(--ease-out);
}

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

.primary-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
}

.primary-nav__list a {
  display: block;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  color: rgba(244, 245, 240, 0.8);
  padding: 8px 12px;
  border-radius: 3px;
  border: 1px solid transparent;
  transition: color var(--speed) ease, border-color var(--speed) ease, background-color var(--speed) ease;
}

.primary-nav__list a:hover {
  color: var(--c-paper);
  border-color: rgba(255, 255, 255, 0.2);
}

.primary-nav__list a[aria-current="page"] {
  color: var(--c-lime);
  border-color: rgba(198, 255, 61, 0.5);
  background: rgba(198, 255, 61, 0.06);
}

.header-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-line);
  line-height: 1.5;
  text-align: right;
}

.header-meta__coordinate {
  color: var(--c-orange);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  min-width: 56px;
}

.nav-toggle__line {
  width: 24px;
  height: 2px;
  background: var(--c-paper);
  border-radius: 2px;
  transition: transform var(--speed) ease, opacity var(--speed) ease;
}

.nav-toggle__text {
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--c-paper);
  margin-top: 2px;
}

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

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

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

@media (max-width: 900px) {
  .header-grid {
    justify-content: space-between;
  }

  .brand-mark {
    border-right: 0;
    padding-right: 0;
  }

  .primary-nav {
    order: 4;
    flex-basis: 100%;
    display: none;
  }

  .primary-nav[data-open] {
    display: flex;
    justify-content: flex-start;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .primary-nav__list {
    flex-direction: column;
    gap: 6px;
    width: 100%;
  }

  .primary-nav__list a {
    padding: 12px 16px;
    font-size: 0.9375rem;
  }

  .header-meta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

/* ========== Footer ========== */
.site-footer {
  background: var(--c-ink);
  color: var(--c-paper);
  border-top: var(--footer-top-border);
  position: relative;
  z-index: 20;
}

.footer-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: 48px 0 28px;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}

@media (min-width: 768px) {
  .footer-map {
    grid-template-columns: 1.2fr 1.4fr 1fr;
    gap: 40px;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-brand__label {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 900;
  color: var(--c-paper);
  letter-spacing: 0.02em;
}

.footer-brand__desc {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--c-line);
  letter-spacing: 0.1em;
}

.footer-brand__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  color: var(--c-line);
  margin-top: 8px;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
}

.legend-dot--orange {
  background: var(--c-orange);
}

.legend-dot--green {
  background: var(--c-lime);
}

.legend-dot--white {
  background: var(--c-paper);
}

.footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.footer-nav__title,
.footer-contact__title {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--c-orange);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 6px;
  margin-bottom: 14px;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-nav a {
  font-size: 0.875rem;
  font-weight: 600;
  color: rgba(244, 245, 240, 0.78);
  transition: color var(--speed) ease, padding-left var(--speed) ease;
}

.footer-nav a:hover {
  color: var(--c-lime);
  padding-left: 4px;
}

.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.8125rem;
  color: var(--c-line);
}

.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact li span:first-child {
  font-family: var(--font-data);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gray);
}

.footer-contact li a {
  color: var(--c-paper);
  font-weight: 600;
  word-break: break-all;
}

.footer-contact li a:hover {
  color: var(--c-lime);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 18px 0 24px;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  color: var(--c-gray);
  line-height: 1.6;
}

.footer-legal span:last-child {
  max-width: 600px;
}

/* ========== Back to Top & Progress Ring ========== */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(10, 12, 14, 0.72);
  border: 1px solid rgba(244, 245, 240, 0.15);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity var(--speed) ease, transform var(--speed) ease, border-color var(--speed) ease;
  z-index: 100;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--c-lime);
}

.progress-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring__bg,
.progress-ring__fg {
  fill: none;
  stroke-width: 3;
}

.progress-ring__bg {
  stroke: rgba(255, 255, 255, 0.15);
}

.progress-ring__fg {
  stroke: var(--c-lime);
  stroke-linecap: round;
  stroke-dasharray: 113.0973;
  stroke-dashoffset: 113.0973;
  transition: stroke-dashoffset 0.1s linear;
}

.back-to-top__arrow {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-paper);
  pointer-events: none;
}

/* ========== Reusable Components ========== */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--c-space);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.media-frame::after {
  content: "IMAGE · SVG";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: rgba(244, 245, 240, 0.5);
  text-transform: uppercase;
  background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.04) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.04) 75%);
  background-size: 16px 16px;
}

@media (min-width: 768px) {
  .media-frame {
    aspect-ratio: 21 / 9;
  }
}

.glass-panel {
  background: var(--c-white-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  padding: 20px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-family: var(--font-data);
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
}

.data-table th {
  font-weight: 600;
  color: var(--c-gray);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.section-index {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gray);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.section-index::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--c-orange);
}

.diagonal-edge {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
}

.diagonal-edge::after {
  content: "";
  position: absolute;
  right: -5%;
  left: -5%;
  top: 0;
  height: 16px;
  background: var(--c-paper);
  transform: rotate(-1.5deg) translateY(-40%);
  transform-origin: center;
}

/* ========== Section spacing ========== */
.section {
  padding: 64px 0;
}

@media (min-width: 768px) {
  .section {
    padding: 96px 0;
  }
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 0.9375rem;
  color: var(--c-gray);
  font-weight: 400;
  max-width: 480px;
}