/* ============================================================
   宇博启航 · Site Kit
   /assets/site.css
   ============================================================ */

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

/* ---------- Design Tokens ---------- */
:root {
  --deep-blue: #0A3A5B;
  --sky-blue: #144E73;
  --vital-orange: #F28C28;
  --gold: #F5C04B;
  --dawn-white: #F4F7FA;
  --dark-ink: #0D2434;
  --text-ink: #11263A;
  --pure-white: #FFFFFF;
  --mist-gray: #A7B8C4;
  --shadow-blue: #D9EDFF;

  --font-sans: 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei', sans-serif;
  --h1-size: clamp(2.5rem, 6vw, 4.5rem);
  --h2-size: clamp(1.8rem, 4vw, 2.8rem);
  --h3-size: 1.4rem;
  --body-size: 1rem;
  --small-size: 0.75rem;
  --h1-weight: 900;
  --h2-weight: 700;
  --h3-weight: 600;
  --body-weight: 300;
  --line-height: 1.7;

  --header-h: 4.5rem;
  --content-max: 1200px;
  --content-pad: clamp(1rem, 4vw, 2.5rem);
  --section-gap: clamp(3.5rem, 8vw, 6rem);

  --shadow-soft: 0 8px 25px rgba(10, 58, 91, 0.12);
  --shadow-lg: 0 12px 32px rgba(10, 58, 91, 0.22);
  --ease: 0.28s ease;

  --z-progress: 1000;
  --z-header: 900;
  --z-nav: 950;
  --z-back: 800;
  --z-skip: 1200;
}

/* ---------- Base & Typography ---------- */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: var(--body-size);
  font-weight: var(--body-weight);
  line-height: var(--line-height);
  color: var(--text-ink);
  background-color: var(--dawn-white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  flex: 1;
  width: 100%;
}

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

a {
  color: var(--deep-blue);
  text-decoration: none;
  transition: color var(--ease), background-color var(--ease), border-color var(--ease);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  color: var(--text-ink);
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--h1-size);
  font-weight: var(--h1-weight);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--h2-size);
  font-weight: var(--h2-weight);
}

h3 {
  font-size: var(--h3-size);
  font-weight: var(--h3-weight);
}

::selection {
  background: var(--shadow-blue);
  color: var(--deep-blue);
}

:focus-visible {
  outline: 3px solid var(--vital-orange);
  outline-offset: 2px;
}

[id] {
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 1rem);
  }
}

/* ---------- Layout: Container / Grid / Section ---------- */
.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2.5vw, 2rem);
}

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

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.section {
  padding-block: var(--section-gap);
}

.section--dark {
  background: var(--deep-blue);
  color: var(--pure-white);
}

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

.section--light {
  background: var(--dawn-white);
}

.section--print {
  background: var(--pure-white);
}

.section--ink {
  background: var(--dark-ink);
  color: var(--dawn-white);
}

.section--ink h1,
.section--ink h2,
.section--ink h3 {
  color: var(--pure-white);
}

.header-offset {
  padding-top: var(--header-h);
}

/* ---------- Utilities ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: var(--z-skip);
  padding: 0.6rem 1.2rem;
  background: var(--vital-orange);
  color: var(--pure-white);
  font-size: var(--small-size);
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 2px;
  transform: translateY(-250%);
  transition: transform 0.3s ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline: 3px solid var(--pure-white);
  outline-offset: 2px;
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--vital-orange) 0%, var(--gold) 100%);
  z-index: var(--z-progress);
  border-radius: 0 2px 2px 0;
  transition: width 0.1s linear;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: transparent;
  transition: background-color var(--ease), box-shadow var(--ease);
}

.site-header.is-scrolled {
  background: var(--deep-blue);
  box-shadow: var(--shadow-lg);
}

body.no-hero .site-header {
  background: var(--deep-blue);
  box-shadow: var(--shadow-lg);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: var(--header-h);
  padding-block: 0.75rem;
}

/* Brand */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--pure-white);
  flex-shrink: 0;
  line-height: 1;
}

.site-brand:hover {
  color: var(--pure-white);
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  background: linear-gradient(135deg, var(--vital-orange) 0%, var(--gold) 100%);
  color: var(--deep-blue);
  font-size: 1.3rem;
  font-weight: 900;
  border-radius: 4px;
  flex-shrink: 0;
}

.site-brand__text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--pure-white);
}

.site-brand__version {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.85);
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
  padding-left: 1rem;
  margin-left: 0.5rem;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__link {
  display: block;
  padding: 0.5rem 0.9rem;
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 3px;
  position: relative;
  transition: color var(--ease), background-color var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.25rem;
  height: 2px;
  background: var(--vital-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--ease);
}

.site-nav__link:hover {
  color: var(--pure-white);
  background-color: rgba(242, 140, 40, 0.12);
}

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

.site-nav__link[aria-current="page"] {
  color: var(--pure-white);
  font-weight: 700;
}

.site-nav__item--cta {
  display: none;
  margin-top: 0.75rem;
}

/* Header CTA */
.site-header__cta {
  flex-shrink: 0;
  padding: 0.55rem 1.2rem;
  font-size: 0.88rem;
}

/* Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  background: rgba(10, 58, 91, 0.6);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--pure-white);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border: 2px solid transparent;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease), transform 0.15s ease, box-shadow var(--ease);
}

.btn--primary {
  background: var(--vital-orange);
  color: var(--pure-white);
  border-color: var(--vital-orange);
}

.btn--primary:hover {
  background: #E07E1F;
  border-color: #E07E1F;
  color: var(--pure-white);
  box-shadow: 0 4px 15px rgba(242, 140, 40, 0.35);
}

.btn--primary:active {
  transform: scale(0.97);
}

.btn--ghost {
  background: transparent;
  color: var(--pure-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--pure-white);
  color: var(--pure-white);
}

.btn--outline {
  background: transparent;
  color: var(--deep-blue);
  border-color: var(--deep-blue);
}

.btn--outline:hover {
  background: var(--deep-blue);
  color: var(--pure-white);
}

.btn--small {
  padding: 0.4rem 1rem;
  font-size: 0.82rem;
}

.btn--large {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--deep-blue);
  color: rgba(255, 255, 255, 0.85);
}

.site-footer::before {
  content: "启";
  position: absolute;
  right: -40px;
  top: -60px;
  font-size: 16rem;
  font-weight: 900;
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  pointer-events: none;
  user-select: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--vital-orange) 0%, var(--gold) 40%, transparent 100%);
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.site-footer__logo {
  font-size: 2rem;
  font-weight: 900;
  color: var(--pure-white);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.site-footer__logo span {
  color: var(--vital-orange);
}

.site-footer__about {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.75);
  max-width: 34ch;
  margin-bottom: 1.2rem;
}

.site-footer__trust {
  font-size: 0.8rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--vital-orange);
  padding: 0.8rem 1rem;
  margin-bottom: 1.5rem;
}

.site-footer__more {
  margin-top: 0.25rem;
}

.site-footer__heading {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  position: relative;
}

.site-footer__heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--vital-orange);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.site-footer__links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
  padding: 0.15rem 0;
  transition: color var(--ease), padding-left var(--ease);
}

.site-footer__links a:hover {
  color: var(--vital-orange);
  padding-left: 0.35rem;
}

.site-footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.site-footer__contact-list li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-footer__label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
}

.site-footer__value {
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.9);
  word-break: break-word;
  overflow-wrap: break-word;
}

.site-footer__bottom {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.15);
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.25rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
}

.site-footer__copyright {
  color: rgba(255, 255, 255, 0.7);
}

.site-footer__icp {
  letter-spacing: 0.05em;
}

.site-footer__service-note {
  flex-basis: 100%;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: var(--z-back);
  width: 48px;
  height: 48px;
  border: 2px solid var(--deep-blue);
  border-radius: 50%;
  background: var(--pure-white);
  color: var(--deep-blue);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--ease), visibility var(--ease), transform var(--ease), background-color var(--ease), border-color var(--ease), color var(--ease);
}

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

.back-to-top:hover {
  background: var(--vital-orange);
  border-color: var(--vital-orange);
  color: var(--pure-white);
}

.back-to-top:active {
  transform: scale(0.92);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--mist-gray);
  margin-bottom: 2rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__link {
  color: var(--deep-blue);
}

.breadcrumb__link:hover {
  color: var(--vital-orange);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--text-ink);
  font-weight: 600;
}

.breadcrumb__separator {
  color: var(--mist-gray);
  user-select: none;
}

/* ---------- Base Components ---------- */

/* Paper Cards */
.paper {
  position: relative;
  background: var(--pure-white);
  border: 1px solid rgba(167, 184, 196, 0.5);
  box-shadow: var(--shadow-soft);
  padding: clamp(1.25rem, 3vw, 2rem);
  border-radius: 2px;
  transition: border-color var(--ease), box-shadow var(--ease);
}

.paper:hover {
  border-color: var(--vital-orange);
  box-shadow: 0 10px 30px rgba(10, 58, 91, 0.18);
}

.paper--print {
  border: 1px solid var(--deep-blue);
  box-shadow: none;
}

.paper--print::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(10, 58, 91, 0.25);
  pointer-events: none;
}

.paper--flat {
  box-shadow: none;
  border: 1px solid var(--mist-gray);
}

.paper--flat:hover {
  border-color: var(--deep-blue);
  box-shadow: none;
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.4;
  border-radius: 999px;
  background: var(--shadow-blue);
  color: var(--deep-blue);
  white-space: nowrap;
}

.tag--orange {
  background: var(--vital-orange);
  color: var(--pure-white);
}

.tag--blue {
  background: var(--deep-blue);
  color: var(--pure-white);
}

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

.tag--outline.tag--orange {
  background: transparent;
  border-color: var(--vital-orange);
  color: var(--vital-orange);
}

/* Vertical Label */
.label-vertical {
  display: inline-block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: var(--small-size);
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.5;
  color: var(--vital-orange);
}

/* Archive Card */
.archive-card {
  position: relative;
  background: var(--pure-white);
  border: 1px solid var(--deep-blue);
  border-top: 4px solid var(--deep-blue);
  padding: 1.75rem;
  transition: border-color var(--ease), border-top-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.archive-card:hover {
  border-color: var(--vital-orange);
  border-top-color: var(--vital-orange);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(10, 58, 91, 0.15);
}

.archive-card__tag {
  position: absolute;
  top: -0.5rem;
  right: 1rem;
  background: var(--vital-orange);
  color: var(--pure-white);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.7rem;
  border-radius: 2px;
}

.archive-card__title {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-ink);
  line-height: 1.3;
}

.archive-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--mist-gray);
  margin-bottom: 0.75rem;
}

.archive-card__summary {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(17, 38, 58, 0.75);
}

.archive-card__link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--vital-orange);
  text-decoration: underline;
  text-underline-offset: 0.25rem;
  text-decoration-color: rgba(242, 140, 40, 0.3);
  transition: text-decoration-color var(--ease);
}

.archive-card__link:hover {
  text-decoration-color: var(--vital-orange);
  color: var(--vital-orange);
}

/* Index List */
.index-list {
  border-top: 1px solid var(--mist-gray);
}

.index-list__item {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1.1rem 0.25rem;
  border-bottom: 1px solid rgba(167, 184, 196, 0.4);
  transition: background-color var(--ease);
}

.index-list__item:hover {
  background-color: var(--shadow-blue);
}

.index-list__date {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--vital-orange);
}

.index-list__link {
  flex: 1;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-ink);
  transition: color var(--ease);
}

.index-list__link:hover {
  color: var(--vital-orange);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(242, 140, 40, 0.4);
}

.index-list__category {
  flex-shrink: 0;
}

/* Image Frames */
.image-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--sky-blue) 0%, var(--deep-blue) 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.image-frame::before {
  content: "";
  display: block;
  padding-top: 75%;
}

.image-frame > img,
.image-frame > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame--hero::before {
  padding-top: 56.25%;
}

.image-frame--card::before {
  padding-top: 100%;
}

.image-frame--wide::before {
  padding-top: 45%;
}

.image-frame--print {
  border: 1px solid var(--deep-blue);
  padding: 8px;
}

.image-frame--print::before {
  padding-top: calc(75% - 16px);
}

.image-frame--print::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--vital-orange);
  pointer-events: none;
  z-index: 1;
}

.image-frame---print > img,
.image-frame--print > img {
  inset: 8px;
  width: calc(100% - 16px);
  height: calc(100% - 16px);
}

.image-frame--print .image-frame--print::before {
  padding-top: 75%;
}

.image-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  background: var(--vital-orange);
  color: var(--pure-white);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.75rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .site-header__cta {
    padding: 0.5rem 1rem;
    font-size: 0.84rem;
  }

  .site-nav__link {
    padding: 0.5rem 0.6rem;
    font-size: 0.85rem;
  }

  .site-brand__text {
    font-size: 1.1rem;
  }

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

  .site-footer__brand {
    grid-column: 1 / -1;
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .col-5 { grid-column: span 6; }
  .col-7 { grid-column: span 6; }
}

@media (max-width: 768px) {
  :root {
    --header-h: 4rem;
  }

  .header-offset {
    padding-top: var(--header-h);
  }

  .site-header__inner {
    gap: 0.75rem;
    padding-block: 0.5rem;
  }

  .site-header__cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    padding: 1rem var(--content-pad) 1.5rem;
    background: var(--deep-blue);
    box-shadow: var(--shadow-lg);
    border-left: none;
    margin-left: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(calc(-100% - var(--header-h)));
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0.15rem;
  }

  .site-nav__link {
    padding: 0.85rem 1rem;
    font-size: 1.05rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link:hover {
    background: rgba(242, 140, 40, 0.15);
  }

  .site-nav__item--cta {
    display: block;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .site-footer__brand {
    grid-column: auto;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

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

  .col-3,
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-9,
  .col-12 {
    grid-column: span 1;
  }

  .index-list__item {
    flex-wrap: wrap;
    gap: 0.35rem 0.75rem;
  }

  .index-list__date,
  .index-list__category {
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .site-brand__text {
    font-size: 1.05rem;
  }

  .site-brand__version {
    display: none;
  }

  .site-brand__mark {
    width: 2.1rem;
    height: 2.1rem;
    font-size: 1.1rem;
  }

  .btn--large {
    padding: 0.8rem 1.5rem;
    font-size: 0.95rem;
  }
}

/* ---------- 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;
  }
}