/* ============================================
   九博体育汇 · Site Kit
   /assets/site.css
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-primary: #0A1E3F;
  --color-gold: #C9A227;
  --color-ink: #111111;
  --color-cinnabar: #9E2B25;
  --color-paper: #F5F0E6;
  --color-jade: #E8F0E8;
  --color-shadow-blue: #1D3557;
  --color-gray: #4A4A4A;
  --color-gold-bright: #E0B84C;
  --color-white: #FFFFFF;

  --font-display: 'Noto Serif SC', 'Source Han Serif SC', 'Kaiti SC', 'STSong', serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --header-height: 80px;
  --container-width: 1280px;
  --container-narrow: 880px;
  --gutter: 24px;
  --radius: 2px;
  --radius-lg: 6px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --section-pad: 96px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul,
ol {
  list-style: none;
}

ul:not([class]),
ol:not([class]) {
  list-style: revert;
  margin-bottom: 1em;
  padding-left: 1.2em;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.6em;
}

p {
  margin-bottom: 0.8em;
}

blockquote {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-primary);
  border-left: 3px solid var(--color-gold);
  padding: 8px 24px;
  margin: 32px 0;
}

::selection {
  background: var(--color-gold);
  color: var(--color-primary);
}

/* ---------- Layout Primitive ---------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: var(--container-narrow);
}

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

.section--tight {
  padding-block: calc(var(--section-pad) / 2);
}

.section--paper {
  background-color: var(--color-paper);
}

.section--jade {
  background-color: var(--color-jade);
}

.section--dark {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
}

.section--dark .eyebrow {
  color: var(--color-gold-bright);
}

.section--dark .eyebrow::before {
  background: var(--color-gold-bright);
}

.section--dark .section-title,
.section--dark .display-title {
  color: var(--color-white);
}

.section--dark .card {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}

.section--dark .card__title {
  color: var(--color-white);
}

.section--dark .card__text {
  color: rgba(255, 255, 255, 0.62);
}

.section--dark .accordion {
  border-bottom-color: rgba(255, 255, 255, 0.12);
}

.section--dark .accordion__header {
  color: var(--color-white);
}

.section--dark .accordion__content {
  color: rgba(255, 255, 255, 0.6);
}

.section--dark .breadcrumb__link {
  color: rgba(255, 255, 255, 0.8);
}

.section--dark .breadcrumb__sep {
  color: rgba(255, 255, 255, 0.4);
}

.section--dark .skill-node {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
  border-left-color: var(--color-gold);
  border-left-width: 3px;
}

.section--dark .skill-node__title {
  color: var(--color-white);
}

.section--dark .skill-node__text {
  color: rgba(255, 255, 255, 0.6);
}

.main-content {
  flex: 1 0 auto;
}

.grid {
  display: grid;
  gap: 24px;
}

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

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

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.content-grid {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.content-grid__aside {
  position: sticky;
  top: calc(var(--header-height) + 32px);
}

/* ---------- Typography ---------- */
.display-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 12px;
}

.eyebrow::before {
  content: '';
  width: 36px;
  height: 1px;
  background: var(--color-gold);
  flex-shrink: 0;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-gray);
}

.gold-line {
  display: inline-block;
  width: 48px;
  height: 2px;
  background: var(--color-gold);
  border: none;
  flex-shrink: 0;
}

.divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 100%);
  margin: 32px 0;
  opacity: 0.4;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.4s var(--ease-out), border-color 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 30, 63, 0.45) 0%, transparent 100%);
  pointer-events: none;
  transition: opacity 0.4s var(--ease-out);
}

.site-header[data-scrolled] {
  background: rgba(10, 30, 63, 0.95);
  border-bottom-color: rgba(201, 162, 39, 0.35);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.site-header[data-scrolled]::before {
  opacity: 0;
}

.site-header__inner {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.brand__seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  color: var(--color-gold);
  border: 2px solid var(--color-gold);
  border-radius: 3px;
  background: transparent;
  position: relative;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}

.brand__seal::after {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid rgba(201, 162, 39, 0.6);
  border-radius: 2px;
}

.brand__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.08em;
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-top: 2px;
}

/* ---------- Navigation ---------- */
.site-nav {
  position: relative;
  z-index: 2;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 12px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-white);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-bright));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.35s var(--ease-out);
}

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

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  font-weight: 400;
}

.site-nav__label {
  letter-spacing: 0.02em;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 2;
  width: 44px;
  height: 44px;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius);
  background: rgba(10, 30, 63, 0.2);
  transition: border-color 0.3s, background 0.3s;
}

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

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.35s var(--ease-out), opacity 0.25s;
}

/* ---------- Footer ---------- */
.site-footer {
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.7);
  position: relative;
  margin-top: auto;
}

.site-footer::before {
  content: '';
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-gold) 40%, var(--color-gold-bright) 70%, var(--color-primary) 100%);
}

.site-footer__inner {
  padding-block: 72px 32px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}

.site-footer__brand {
  max-width: 360px;
}

.site-footer__logo {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.site-footer__slogan {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-gold);
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}

.site-footer__desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
}

.site-footer__column {
  min-width: 0;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(201, 162, 39, 0.25);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer__list a {
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
  transition: color 0.3s;
}

.site-footer__list a:hover {
  color: var(--color-gold);
}

.site-footer__list--contact li {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
}

.site-footer__note {
  margin-top: 12px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  line-height: 1.6;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 32px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
  background: var(--color-gold);
  border: 2px solid var(--color-gold);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.btn:hover {
  background: var(--color-gold-bright);
  border-color: var(--color-gold-bright);
  box-shadow: 0 6px 20px rgba(201, 162, 39, 0.28);
  transform: translateY(-2px);
}

.btn:focus-visible {
  outline: 3px solid var(--color-gold-bright);
  outline-offset: 2px;
}

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

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

.btn--light {
  background: var(--color-paper);
  border-color: var(--color-paper);
  color: var(--color-primary);
}

.btn--light:hover {
  background: var(--color-white);
  border-color: var(--color-white);
}

.btn--small {
  padding: 8px 20px;
  font-size: 13px;
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-paper);
  border: 1px solid rgba(10, 30, 63, 0.08);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 30, 63, 0.1);
}

.card--jade {
  background: var(--color-jade);
}

.card--dark {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  border-color: rgba(201, 162, 39, 0.3);
}

.card__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.card--dark .card__title {
  color: var(--color-white);
}

.card__text {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-gold);
  letter-spacing: 0.1em;
  margin-top: 16px;
  display: block;
}

/* ---------- Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  border-radius: 999px;
  background: transparent;
  white-space: nowrap;
}

.tag--red {
  border-color: var(--color-cinnabar);
  color: var(--color-cinnabar);
}

.tag--solid {
  background: var(--color-gold);
  color: var(--color-primary);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-gray);
  margin-bottom: 24px;
}

.breadcrumb__link {
  color: var(--color-primary);
  transition: color 0.3s;
}

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

.breadcrumb__link[aria-current="page"] {
  color: var(--color-gray);
  pointer-events: none;
}

.breadcrumb__sep {
  color: var(--color-gray);
  opacity: 0.5;
}

/* ---------- Accordion ---------- */
.accordion {
  border-bottom: 1px solid rgba(10, 30, 63, 0.12);
}

.accordion__header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  transition: color 0.3s;
}

.accordion__header:hover {
  color: var(--color-gold);
}

.accordion__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  flex-shrink: 0;
  transition: transform 0.3s var(--ease-out), background 0.3s, color 0.3s;
}

.accordion__header[aria-expanded="true"] .accordion__icon {
  transform: rotate(45deg);
  background: var(--color-gold);
  color: var(--color-primary);
}

.accordion__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out);
}

.accordion__content {
  padding-bottom: 24px;
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.75;
  max-width: 720px;
}

/* ---------- Skill Tree ---------- */
.skill-tree {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  position: relative;
}

.skill-node {
  position: relative;
  padding: 32px 28px;
  background: var(--color-paper);
  border: 1px solid rgba(10, 30, 63, 0.08);
  border-left: 3px solid var(--color-gold);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.skill-node:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 30, 63, 0.1);
}

.skill-node__step {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-gold);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.skill-node__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.skill-node__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray);
}

/* ---------- Index List ---------- */
.index-list {
  border-left: 2px solid var(--color-gold);
  padding-left: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--color-gray);
  transition: color 0.3s;
}

.index-list a:hover,
.index-list a[aria-current="page"] {
  color: var(--color-primary);
}

.index-list__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-gold);
}

/* ---------- Image Frames ---------- */
.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--color-jade);
  border: 1px solid rgba(201, 162, 39, 0.25);
  border-radius: var(--radius-lg);
}

.image-frame--wide {
  aspect-ratio: 16 / 9;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame--hero {
  aspect-ratio: auto;
  min-height: 380px;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease-out);
}

.image-frame:hover img {
  transform: scale(1.03);
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2001;
  pointer-events: none;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-gold-bright) 100%);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: rgba(10, 30, 63, 0.9);
  border: 1px solid rgba(201, 162, 39, 0.5);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0.3s, background 0.3s;
}

.back-to-top::before {
  content: '↑';
  font-size: 16px;
  color: var(--color-gold);
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.3s;
}

.back-to-top:hover {
  background: var(--color-primary);
  border-color: var(--color-gold);
}

/* ---------- Page Hero ---------- */
.page-hero {
  min-height: 56vh;
  display: flex;
  align-items: flex-end;
  background: var(--color-primary);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 56px;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 78% 30%, rgba(201, 162, 39, 0.16) 0%, transparent 45%),
    radial-gradient(ellipse at 15% 85%, rgba(29, 53, 87, 0.6) 0%, transparent 55%);
  pointer-events: none;
}

.page-hero > * {
  position: relative;
  z-index: 1;
}

.page-hero--short {
  min-height: 36vh;
  padding-bottom: 40px;
}

.page-hero .display-title,
.page-hero .section-title {
  color: var(--color-white);
}

/* ---------- Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

[data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal="fade"] {
  transform: none;
}

[data-reveal="left"] {
  transform: translateX(-24px);
}

[data-reveal="right"] {
  transform: translateX(24px);
}

[data-reveal="left"][data-revealed],
[data-reveal="right"][data-revealed] {
  transform: translateX(0);
}

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

.skip-link {
  position: fixed;
  top: -48px;
  left: 16px;
  z-index: 2000;
  padding: 10px 20px;
  background: var(--color-gold);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
  border-radius: 0 0 4px 4px;
  transition: top 0.3s ease;
}

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

/* ---------- Focus Visible ---------- */
:focus-visible {
  outline: 3px solid var(--color-gold-bright);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Media Queries ---------- */
@media (max-width: 991px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .content-grid__aside {
    position: static;
  }

  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
  }
}

@media (max-width: 899px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(10, 30, 63, 0.97);
    border-bottom: 1px solid rgba(201, 162, 39, 0.4);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.3);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s var(--ease-out), opacity 0.35s var(--ease-out), visibility 0s linear 0.35s;
  }

  .site-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    transition: transform 0.35s var(--ease-out), opacity 0.35s var(--ease-out);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 24px 24px;
  }

  .site-nav__link {
    padding: 14px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 16px;
    justify-content: flex-start;
    display: flex;
    align-items: baseline;
    gap: 12px;
  }

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

  .site-nav__item:last-child .site-nav__link {
    border-bottom: none;
  }

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

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar--middle {
    opacity: 0;
    transform: translateX(6px);
  }

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

@media (max-width: 767px) {
  .section {
    --section-pad: 56px;
  }

  .page-hero {
    min-height: 48vh;
    padding-bottom: 40px;
  }

  .image-frame--hero {
    min-height: 260px;
  }
}

@media (max-width: 599px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }

  .skill-tree {
    grid-template-columns: 1fr;
  }
}

/* ---------- 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;
    transition-delay: 0ms !important;
  }

  [data-reveal],
  [data-reveal="fade"],
  [data-reveal="left"],
  [data-reveal="right"] {
    opacity: 1;
    transform: none;
  }

  .back-to-top {
    transition: none;
  }
}