/* Cloud-Sync Site Shell (Header + Footer)
   Rebuilt from scratch (mobile-first). */

:root {
  --bg: #0b0b0b;
  --text: #e5e7eb;
  --muted: rgba(229, 231, 235, 0.68);
  --border: rgba(255, 255, 255, 0.12);
  --border-2: rgba(255, 255, 255, 0.08);
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
  --accent: #f5c16c;

  --jet: rgba(255, 255, 255, 0.14);
  --white-2: #e5e7eb;
  --orange-yellow-crayola: #f5c16c;
  --bittersweet-shimmer: #f87171;
  --border-gradient-onyx: linear-gradient(135deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.04));
  --bg-gradient-jet: linear-gradient(135deg, rgba(12, 12, 12, 0.9), rgba(24, 24, 24, 0.95));
  --bg-gradient-yellow-1: linear-gradient(135deg, rgba(245, 193, 108, 0.7), rgba(245, 193, 108, 0.28));
  --bg-gradient-yellow-2: linear-gradient(135deg, rgba(245, 193, 108, 0.2), rgba(245, 193, 108, 0.08));
  --shadow-3: 0 8px 20px rgba(0, 0, 0, 0.4);
  --transition-1: 0.25s ease;
  --fs-6: 14px;
  --fw-400: 400;
  --fw-500: 500;

  --header-bg: rgba(11, 11, 11, 0.82);
  --panel-bg: rgba(15, 15, 15, 0.92);
  --sheet-bg: rgba(12, 12, 12, 0.92);
  --backdrop-bg: rgba(0, 0, 0, 0.55);
  --footer-bg: rgba(10, 10, 10, 0.92);

  --site-header-height: 64px;
  --site-header-z: 1200;
  --site-content-gap: 20px;
}

html[data-theme="light"] {
  --bg: #f6f7fb;
  --text: #0b0b0b;
  --muted: rgba(12, 12, 12, 0.62);
  --border: rgba(12, 12, 12, 0.14);
  --border-2: rgba(12, 12, 12, 0.09);
  --surface: rgba(12, 12, 12, 0.04);
  --surface-2: rgba(12, 12, 12, 0.06);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.18);
  --accent: #d97706;

  --jet: rgba(12, 12, 12, 0.18);
  --white-2: #111827;
  --orange-yellow-crayola: #d97706;
  --bittersweet-shimmer: #dc2626;
  --border-gradient-onyx: linear-gradient(135deg, rgba(12, 12, 12, 0.16), rgba(12, 12, 12, 0.06));
  --bg-gradient-jet: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(243, 244, 246, 0.9));
  --bg-gradient-yellow-1: linear-gradient(135deg, rgba(245, 193, 108, 0.85), rgba(245, 193, 108, 0.4));
  --bg-gradient-yellow-2: linear-gradient(135deg, rgba(245, 193, 108, 0.3), rgba(245, 193, 108, 0.12));
  --shadow-3: 0 8px 20px rgba(17, 24, 39, 0.18);
  --transition-1: 0.25s ease;
  --fs-6: 14px;
  --fw-400: 400;
  --fw-500: 500;

  --header-bg: rgba(255, 255, 255, 0.78);
  --panel-bg: rgba(255, 255, 255, 0.92);
  --sheet-bg: rgba(255, 255, 255, 0.92);
  --backdrop-bg: rgba(15, 23, 42, 0.12);
  --footer-bg: rgba(255, 255, 255, 0.92);
}

@media (max-width: 768px) {
  :root {
    --site-header-height: 56px;
    --site-content-gap: 16px;
  }
}

* { box-sizing: border-box; }

img {
  max-width: 100%;
  height: auto;
}

body {
  overflow-x: hidden;
}

html { background: var(--bg); color: var(--text); }

/* ------------------------------
   Header
------------------------------ */
.cs-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--site-header-z);
  height: var(--site-header-height);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-2);
  backdrop-filter: blur(12px);
}

.cs-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(245, 193, 108, 0.42), transparent);
  opacity: 0.9;
  pointer-events: none;
}

.cs-header.cs-header--scrolled {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.cs-header__inner {
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.cs-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 900;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  font-size: 13.5px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) and (pointer: fine) {
  .cs-brand:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--border-2);
  }
}

.cs-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cs-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cs-icon-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  color: var(--text);
  width: 44px;
  height: 44px;
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

@supports not (background: color-mix(in srgb, #000 50%, transparent)) {
  .cs-icon-btn {
    background: rgba(255, 255, 255, 0.035);
  }
}

.cs-theme-btn {
  border-color: color-mix(in srgb, var(--border) 80%, transparent);
}

.cs-icon-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.cs-icon-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(245, 193, 108, 0.22);
  border-color: rgba(245, 193, 108, 0.7);
}

@media (hover: hover) and (pointer: fine) {
  .cs-icon-btn:hover {
    border-color: rgba(245, 193, 108, 0.45);
    color: var(--accent);
  }
}

/* Mobile nav */
.cs-menu-btn { display: none; }

@media (max-width: 980px) {
  .cs-nav { display: none; }
  .cs-menu-btn { display: inline-flex; }
}

.cs-backdrop {
  position: fixed;
  top: var(--site-header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--backdrop-bg);
  backdrop-filter: blur(6px);
  display: none;
  z-index: calc(var(--site-header-z) - 1);
}

body.cs-menu-open .cs-backdrop,
html.cs-menu-open .cs-backdrop {
  display: block;
}

.cs-mobile-menu {
  position: fixed;
  top: var(--site-header-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: calc(var(--site-header-z) + 1);
  background: var(--sheet-bg);
  border-top: 1px solid var(--border-2);
  display: none;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

body.cs-menu-open .cs-mobile-menu,
html.cs-menu-open .cs-mobile-menu {
  display: block;
  animation: csDropIn 140ms ease-out;
}

.cs-mobile-menu__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 16px 24px;
  display: grid;
  gap: 12px;
}

.cs-mobile-menu details {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.cs-mobile-menu summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 48px;
}

.cs-mobile-menu summary::-webkit-details-marker { display: none; }

.cs-mobile-menu summary::after {
  content: '▾';
  opacity: 0.85;
  font-size: 12px;
}

.cs-mobile-menu details[open] summary::after {
  transform: rotate(180deg);
}

.cs-mobile-links {
  padding: 10px 10px 14px;
  display: grid;
  gap: 8px;
}

.cs-mobile-links a {
  display: block;
  text-decoration: none;
  color: var(--text);
  padding: 12px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
}

@media (hover: hover) and (pointer: fine) {
  .cs-mobile-links a:hover {
    border-color: rgba(245, 193, 108, 0.45);
    color: var(--accent);
  }
}

/* Search overlay */
.cs-search {
  position: fixed;
  top: calc(var(--site-header-height) + 10px);
  right: 16px;
  left: auto;
  width: min(520px, calc(100vw - 32px));
  z-index: calc(var(--site-header-z) + 2);
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--sheet-bg) 70%, transparent);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  display: none;
}

@supports not (background: color-mix(in srgb, #000 50%, transparent)) {
  .cs-search {
    background: var(--sheet-bg);
  }
}

body.cs-search-open .cs-search {
  display: block;
  animation: csDropIn 140ms ease-out;
}

.cs-search__inner {
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cs-search input {
  flex: 1;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 14px;
  background: color-mix(in srgb, var(--surface) 75%, transparent);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 15px;
}

@supports not (background: color-mix(in srgb, #000 50%, transparent)) {
  .cs-search input {
    background: var(--surface);
  }
}

.cs-search input:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(245, 193, 108, 0.22);
  border-color: rgba(245, 193, 108, 0.7);
}

html.cs-scroll-locked,
body.cs-scroll-locked {
  overflow: hidden;
}

.cs-nav__list {
  display: flex;
  align-items: center;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.cs-nav-item {
  position: relative;
}

.cs-nav-trigger {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.035);
  color: var(--text);
  font-weight: 650;
  font-size: 13px;
  padding: 9px 12px;
  min-height: 44px;
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.cs-nav-trigger::after {
  content: "▾";
  font-size: 12px;
  opacity: 0.85;
}

.cs-nav-item[data-open="true"] .cs-nav-trigger {
  border-color: rgba(245, 193, 108, 0.7);
  background: rgba(245, 193, 108, 0.10);
  color: var(--accent);
}

.cs-nav-trigger:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(245, 193, 108, 0.22);
  border-color: rgba(245, 193, 108, 0.7);
}

.cs-nav-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: min(320px, 92vw);
  padding: 10px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  box-shadow: var(--shadow);
  display: none;
  max-height: min(70vh, 560px);
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  transform-origin: top right;
}

.cs-nav-item[data-open="true"] .cs-nav-panel {
  display: block;
  animation: csDropIn 140ms ease-out;
}

@keyframes csDropIn {
  from { opacity: 0; transform: translateY(-6px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.cs-nav-section {
  padding: 6px;
}

.cs-nav-title {
  font-size: 11px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--muted);
  margin: 2px 6px 10px;
}

.cs-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.03);
  min-height: 44px;
}

.cs-nav-link[aria-current="page"] {
  border-color: rgba(245, 193, 108, 0.65);
  color: var(--accent);
  background: rgba(245, 193, 108, 0.09);
}

@media (hover: hover) and (pointer: fine) {
  .cs-nav-link:hover {
    border-color: rgba(245, 193, 108, 0.45);
    color: var(--accent);
  }
}

/* ------------------------------
   Footer
------------------------------ */
.cs-footer {
  margin-top: 46px;
  border-top: 1px solid var(--border-2);
  background: var(--footer-bg);
}

.cs-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 16px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 18px;
}

@media (max-width: 900px) {
  .cs-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .cs-footer__inner {
    grid-template-columns: 1fr;
  }
}

.cs-footer h3 {
  font-size: 12px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}

.cs-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cs-footer__logo {
  font-weight: 900;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}

.cs-footer__desc {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  max-width: 52ch;
  font-size: 14px;
}

.cs-footer__links {
  display: grid;
  gap: 8px;
}

.cs-footer__links a {
  text-decoration: none;
  color: var(--text);
  opacity: 0.88;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
}

@media (hover: hover) and (pointer: fine) {
  .cs-footer__links a:hover {
    border-color: var(--border);
    color: var(--accent);
    opacity: 1;
  }
}

.cs-footer__social {
  display: grid;
  gap: 10px;
}

.cs-social-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  opacity: 0.9;
  padding: 10px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
}

.cs-social-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

@media (hover: hover) and (pointer: fine) {
  .cs-social-link:hover {
    border-color: var(--border);
    color: var(--accent);
    opacity: 1;
  }
}

.cs-footer__bottom {
  border-top: 1px solid var(--border-2);
}

.cs-footer__bottom-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 520px) {
  .cs-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}