/* Chengdacai Phase C.0 — reusable staging foundation. */
:root {
  --cdc-navy-950: #071b31;
  --cdc-navy-800: #0b3d72;
  --cdc-navy-700: #0d4f91;
  --cdc-orange: #e98416;
  --cdc-orange-hover: #c96e0b;
  --cdc-white: #ffffff;
  --cdc-gray-50: #f7f9fb;
  --cdc-gray-100: #eef2f5;
  --cdc-gray-200: #dbe3e9;
  --cdc-gray-500: #5c6b78;
  --cdc-gray-700: #263746;
  --cdc-text: #152534;
  --cdc-font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --cdc-text-xs: .75rem;
  --cdc-text-sm: .875rem;
  --cdc-text-base: 1rem;
  --cdc-text-lg: 1.125rem;
  --cdc-h4: clamp(1.125rem, 1.5vw, 1.35rem);
  --cdc-h3: clamp(1.35rem, 2vw, 1.7rem);
  --cdc-h2: clamp(2rem, 4vw, 3.25rem);
  --cdc-h1: clamp(2.55rem, 6vw, 4.75rem);
  --cdc-space-1: .25rem;
  --cdc-space-2: .5rem;
  --cdc-space-3: .75rem;
  --cdc-space-4: 1rem;
  --cdc-space-5: 1.5rem;
  --cdc-space-6: 2rem;
  --cdc-space-7: 3rem;
  --cdc-space-8: 4rem;
  --cdc-space-9: 6rem;
  --cdc-container: 75rem;
  --cdc-container-narrow: 60rem;
  --cdc-radius-sm: .5rem;
  --cdc-radius-md: .875rem;
  --cdc-radius-lg: 1.25rem;
  --cdc-shadow-sm: 0 2px 10px rgb(7 27 49 / 7%);
  --cdc-shadow-md: 0 12px 30px rgb(7 27 49 / 10%);
  --cdc-border: 1px solid var(--cdc-gray-200);
}

.cdc-foundation { color: var(--cdc-text); background: var(--cdc-white); font: 400 var(--cdc-text-base)/1.65 var(--cdc-font); }
.cdc-foundation *, .cdc-foundation *::before, .cdc-foundation *::after { box-sizing: border-box; }
.cdc-foundation a { color: inherit; }
.cdc-foundation img { display: block; max-width: 100%; height: auto; }
.cdc-foundation :focus-visible { outline: 3px solid var(--cdc-orange); outline-offset: 3px; }
.cdc-container { width: min(var(--cdc-container), calc(100% - 2rem)); margin-inline: auto; }
.cdc-skip-link { position: fixed; z-index: 100; top: -5rem; left: var(--cdc-space-4); padding: var(--cdc-space-3) var(--cdc-space-4); color: var(--cdc-navy-950); background: var(--cdc-orange); border-radius: var(--cdc-radius-sm); font-weight: 700; }
.cdc-skip-link:focus { top: var(--cdc-space-4); }
.cdc-eyebrow { margin: 0 0 var(--cdc-space-3); color: var(--cdc-navy-700); font-size: var(--cdc-text-xs); font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.cdc-h1, .cdc-h2, .cdc-h3, .cdc-h4 { margin: 0; color: var(--cdc-navy-950); letter-spacing: -.025em; line-height: 1.16; }
.cdc-h1 { font-size: var(--cdc-h1); } .cdc-h2 { font-size: var(--cdc-h2); } .cdc-h3 { font-size: var(--cdc-h3); } .cdc-h4 { font-size: var(--cdc-h4); }
.cdc-lede { max-width: 45rem; margin: var(--cdc-space-4) 0 0; color: var(--cdc-gray-500); font-size: var(--cdc-text-lg); }
.cdc-section { padding-block: clamp(3.5rem, 8vw, 6rem); }
.cdc-section--gray { background: var(--cdc-gray-50); }
.cdc-button { display: inline-flex; align-items: center; justify-content: center; min-height: 2.9rem; padding: .75rem 1.1rem; border: 1px solid transparent; border-radius: var(--cdc-radius-sm); font: 700 var(--cdc-text-sm)/1.2 var(--cdc-font); letter-spacing: .035em; text-align: center; text-decoration: none; text-transform: uppercase; cursor: pointer; }
.cdc-button--primary { color: var(--cdc-white); background: var(--cdc-navy-700); }
.cdc-button--primary:hover { background: var(--cdc-navy-800); }
.cdc-button--secondary { color: var(--cdc-navy-700); border-color: var(--cdc-navy-700); background: var(--cdc-white); }
.cdc-button--accent { color: var(--cdc-navy-950); background: var(--cdc-orange); }
.cdc-button--accent:hover { background: var(--cdc-orange-hover); }
.cdc-button:disabled { cursor: not-allowed; opacity: .6; }
.cdc-site-header { position: sticky; z-index: 20; top: 0; color: var(--cdc-navy-950); background: rgb(255 255 255 / 96%); border-bottom: var(--cdc-border); backdrop-filter: blur(10px); }
.cdc-header-row { display: flex; min-height: 4.75rem; align-items: center; gap: var(--cdc-space-4); }
.cdc-logo { flex: 0 0 auto; } .cdc-logo img { width: 11.25rem; max-height: 2.65rem; object-fit: contain; object-position: left center; }
.cdc-nav { display: flex; flex: 1; justify-content: flex-end; gap: clamp(.55rem, 1.4vw, 1.25rem); }
.cdc-nav a, .cdc-contact-link { padding: .55rem .15rem; color: var(--cdc-gray-700); font-size: var(--cdc-text-sm); font-weight: 700; text-decoration: none; }
.cdc-nav a:hover, .cdc-contact-link:hover { color: var(--cdc-navy-700); }
.cdc-header-cta { flex: 0 0 auto; }
.cdc-menu-button { display: none; min-width: 2.75rem; min-height: 2.75rem; padding: .5rem; color: var(--cdc-navy-950); border: var(--cdc-border); border-radius: var(--cdc-radius-sm); background: var(--cdc-white); font: 700 var(--cdc-text-sm) var(--cdc-font); }
.cdc-mobile-nav { display: none; border-top: var(--cdc-border); background: var(--cdc-white); }
.cdc-mobile-nav[data-open="true"] { display: block; }
.cdc-mobile-nav a { display: block; padding: .8rem 0; border-bottom: var(--cdc-border); font-weight: 700; text-decoration: none; }
.cdc-breadcrumb { padding-block: var(--cdc-space-4); color: var(--cdc-gray-500); font-size: var(--cdc-text-sm); }
.cdc-breadcrumb ol { display: flex; flex-wrap: wrap; gap: var(--cdc-space-2); padding: 0; margin: 0; list-style: none; }
.cdc-breadcrumb li + li::before { padding-right: var(--cdc-space-2); color: var(--cdc-gray-500); content: "/"; }
.cdc-card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--cdc-space-5); margin-top: var(--cdc-space-6); }
.cdc-card { display: flex; min-height: 100%; flex-direction: column; padding: var(--cdc-space-5); border: var(--cdc-border); border-radius: var(--cdc-radius-md); background: var(--cdc-white); box-shadow: var(--cdc-shadow-sm); }
.cdc-card__type { margin: 0 0 var(--cdc-space-3); color: var(--cdc-navy-700); font-size: var(--cdc-text-xs); font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.cdc-card p { margin: var(--cdc-space-3) 0 var(--cdc-space-5); color: var(--cdc-gray-500); }
.cdc-card .cdc-button { align-self: flex-start; margin-top: auto; }
.cdc-technical-snapshot { border-left: .25rem solid var(--cdc-orange); padding: var(--cdc-space-5); border-radius: 0 var(--cdc-radius-md) var(--cdc-radius-md) 0; background: var(--cdc-gray-50); }
.cdc-technical-snapshot p { margin: var(--cdc-space-2) 0 0; color: var(--cdc-gray-500); }
.cdc-process { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--cdc-space-3); margin-top: var(--cdc-space-6); counter-reset: process; }
.cdc-process__step { padding: var(--cdc-space-4); border-top: 3px solid var(--cdc-navy-700); background: var(--cdc-gray-50); }
.cdc-process__step::before { display: block; margin-bottom: var(--cdc-space-2); color: var(--cdc-orange); font-weight: 800; counter-increment: process; content: "0" counter(process); }
.cdc-process__step p { margin: var(--cdc-space-2) 0 0; color: var(--cdc-gray-500); font-size: var(--cdc-text-sm); }
.cdc-faq details { border-bottom: var(--cdc-border); } .cdc-faq summary { display: flex; justify-content: space-between; gap: var(--cdc-space-4); padding: var(--cdc-space-4) 0; color: var(--cdc-navy-950); font-weight: 750; cursor: pointer; }
.cdc-faq p { max-width: 48rem; margin: 0 0 var(--cdc-space-4); color: var(--cdc-gray-500); }
.cdc-cta-band { padding: var(--cdc-space-7); color: var(--cdc-white); border-radius: var(--cdc-radius-lg); background: var(--cdc-navy-950); }
.cdc-cta-band .cdc-h2 { color: var(--cdc-white); } .cdc-cta-band p { max-width: 42rem; margin: var(--cdc-space-3) 0 var(--cdc-space-5); color: #d9e4ef; }
.cdc-related { padding: var(--cdc-space-5); border: var(--cdc-border); border-radius: var(--cdc-radius-md); background: var(--cdc-white); }
.cdc-related ul { display: flex; flex-wrap: wrap; gap: var(--cdc-space-2); padding: 0; margin: var(--cdc-space-3) 0 0; list-style: none; }
.cdc-related a { color: var(--cdc-navy-700); font-weight: 700; }
.cdc-rfq-teaser { padding: var(--cdc-space-5); border-radius: var(--cdc-radius-md); background: var(--cdc-gray-100); }
.cdc-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--cdc-space-4); }
.cdc-field { display: grid; gap: var(--cdc-space-2); color: var(--cdc-gray-700); font-size: var(--cdc-text-sm); font-weight: 750; }
.cdc-field--full { grid-column: 1 / -1; }
.cdc-field input, .cdc-field textarea, .cdc-field select { width: 100%; min-height: 2.9rem; padding: .7rem .8rem; color: var(--cdc-text); border: var(--cdc-border); border-radius: var(--cdc-radius-sm); background: var(--cdc-white); font: 400 var(--cdc-text-base)/1.4 var(--cdc-font); }
.cdc-field textarea { min-height: 8rem; resize: vertical; }
.cdc-file-placeholder { padding: var(--cdc-space-4); border: 1px dashed var(--cdc-gray-500); border-radius: var(--cdc-radius-sm); color: var(--cdc-gray-500); background: var(--cdc-gray-50); }
.cdc-form-note { margin: var(--cdc-space-3) 0 0; color: var(--cdc-gray-500); font-size: var(--cdc-text-sm); }
.cdc-site-footer { padding-top: var(--cdc-space-8); color: #d9e4ef; background: var(--cdc-navy-950); }
.cdc-footer-grid { display: grid; grid-template-columns: 1.2fr .9fr .9fr 1.35fr; gap: var(--cdc-space-6); padding-bottom: var(--cdc-space-7); }
.cdc-site-footer h2, .cdc-site-footer h3 { color: var(--cdc-white); } .cdc-site-footer p, .cdc-site-footer address { margin: var(--cdc-space-3) 0 0; color: #b9c8d7; font-style: normal; font-size: var(--cdc-text-sm); }
.cdc-site-footer ul { padding: 0; margin: var(--cdc-space-3) 0 0; list-style: none; } .cdc-site-footer li + li { margin-top: var(--cdc-space-2); } .cdc-site-footer a { color: #d9e4ef; }
.cdc-footer-bottom { padding-block: var(--cdc-space-4); border-top: 1px solid rgb(217 228 239 / 20%); color: #b9c8d7; font-size: var(--cdc-text-xs); }
@media (max-width: 64rem) { .cdc-nav, .cdc-contact-link, .cdc-header-cta { display: none; } .cdc-menu-button { display: inline-block; margin-left: auto; } .cdc-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .cdc-footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 48rem) { .cdc-section { padding-block: var(--cdc-space-7); } .cdc-card-grid, .cdc-process, .cdc-form-grid, .cdc-footer-grid { grid-template-columns: 1fr; } .cdc-field--full { grid-column: auto; } .cdc-cta-band { padding: var(--cdc-space-5); } }
@media (max-width: 24rem) { .cdc-container { width: min(var(--cdc-container), calc(100% - 1.25rem)); } .cdc-logo img { width: 9.5rem; } .cdc-button { width: 100%; } }
@media (prefers-reduced-motion: reduce) { .cdc-foundation { scroll-behavior: auto; } }