/* ===== Reset & Variables ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --color-primary:#0A2540;
  --color-primary-dark:#1A3A5C;
  --color-accent:#FF6F3C;
  --color-accent-light:#FF9F6E;
  --color-silver:#E0E6ED;
  --color-warm-white:#F9F9F7;
  --color-text:#121212;
  --color-text-medium:#3D4A5C;
  --color-text-light:#7A8A9A;
  --color-card-bg:#FFFFFF;
  --color-border:#D4DCE5;
  --color-hover-overlay:rgba(255,111,60,0.08);
  --font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --heading-weight:800;
  --body-weight:400;
  --letter-spacing-headings:-0.02em;
  --line-height-body:1.6;
  --radius-card:16px;
  --radius-pill:100px;
  --shadow-card:0 4px 20px rgba(10,37,64,0.08);
  --transition-base:0.3s ease;
  --max-width:1280px;
  --header-height:72px;
}
html{scroll-behavior:smooth;font-size:100%}
body{font-family:var(--font-family);font-weight:var(--body-weight);line-height:var(--line-height-body);color:var(--color-text);background:var(--color-warm-white);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:inherit;text-decoration:none;transition:color var(--transition-base)}
a:hover{color:var(--color-accent)}
img{max-width:100%;display:block;height:auto}
ul{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:var(--heading-weight);letter-spacing:var(--letter-spacing-headings);line-height:1.2}
h1{font-size:clamp(2rem,5vw,3.5rem)}
h2{font-size:clamp(1.5rem,3.5vw,2.5rem)}
h3{font-size:clamp(1.25rem,2.5vw,1.75rem)}
p{max-width:68ch}
/* ===== Accessibility ===== */
:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@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}}
/* ===== Container ===== */
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
@media(min-width:769px){.container{padding:0 40px}}
@media(min-width:1025px){.container{padding:0 64px}}
/* ===== Skip Link ===== */
.skip-link{position:absolute;top:-100%;left:16px;z-index:1000;background:var(--color-accent);color:#fff;padding:12px 24px;border-radius:var(--radius-pill);font-weight:600;font-size:0.9rem;transition:top var(--transition-base)}
.skip-link:focus{top:16px}
/* ===== Scroll Progress ===== */
.scroll-progress{position:fixed;top:0;left:0;z-index:999;height:4px;background:var(--color-accent);width:0%;transition:width 0.15s ease-out;pointer-events:none}
/* ===== Header ===== */
.header{position:fixed;top:0;left:0;right:0;z-index:900;background:var(--color-primary);color:#fff;height:var(--header-height);box-shadow:0 2px 24px rgba(10,37,64,0.2)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:16px}
.brand{flex-shrink:0}
.brand-text{font-size:1.5rem;font-weight:var(--heading-weight);letter-spacing:var(--letter-spacing-headings);color:#fff;transition:opacity var(--transition-base)}
.brand-text:hover{opacity:0.85;color:#fff}
.nav{flex:1;display:none}
.nav-list{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}
.nav-link{display:inline-block;padding:8px 18px;font-size:0.9rem;font-weight:500;color:rgba(255,255,255,0.85);background:rgba(255,255,255,0.06);border-radius:var(--radius-pill);transition:background var(--transition-base),color var(--transition-base),transform var(--transition-base);white-space:nowrap}
.nav-link:hover{background:rgba(255,255,255,0.15);color:#fff;transform:translateY(-2px)}
.nav-link[aria-current="page"]{background:var(--color-accent);color:#fff;box-shadow:0 4px 12px rgba(255,111,60,0.3)}
/* ===== Header Actions ===== */
.header-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}
.version-selector{display:flex;background:rgba(255,255,255,0.08);border-radius:var(--radius-pill);padding:3px}
.version-btn{position:relative;padding:6px 16px;font-size:0.82rem;font-weight:600;color:rgba(255,255,255,0.7);background:transparent;border:none;border-radius:var(--radius-pill);cursor:pointer;transition:all var(--transition-base);font-family:var(--font-family)}
.version-btn.is-active{background:var(--color-accent);color:#fff;box-shadow:0 2px 8px rgba(255,111,60,0.25)}
.version-btn:hover:not(.is-active){color:#fff;background:rgba(255,255,255,0.1)}
.compare-link{display:inline-flex;align-items:center;gap:4px;padding:8px 18px;font-size:0.82rem;font-weight:600;color:var(--color-accent);border:1.5px solid var(--color-accent);border-radius:var(--radius-pill);transition:all var(--transition-base);white-space:nowrap}
.compare-link:hover{background:var(--color-accent);color:#fff}
/* ===== Nav Toggle ===== */
.nav-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:44px;height:44px;background:rgba(255,255,255,0.08);border:none;border-radius:8px;cursor:pointer;padding:10px;flex-shrink:0}
.nav-toggle-icon{display:block;width:22px;height:2.5px;background:#fff;border-radius:4px;transition:all var(--transition-base)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
/* ===== Responsive Header ===== */
@media(min-width:769px){.nav{display:flex}.nav-toggle{display:none}}
@media(max-width:768px){
  .header{height:64px}
  .brand-text{font-size:1.25rem}
  .header-actions .compare-link{display:none}
  .version-selector .version-btn{padding:5px 12px;font-size:0.75rem}
  .nav{position:fixed;top:64px;left:0;right:0;bottom:0;background:var(--color-primary);display:flex;flex-direction:column;padding:24px;transform:translateX(100%);transition:transform var(--transition-base);overflow-y:auto;z-index:899}
  .nav[data-open]{transform:translateX(0)}
  .nav-list{flex-direction:column;gap:8px;width:100%}
  .nav-link{width:100%;text-align:center;padding:14px 20px;font-size:1rem}
}
/* ===== Footer ===== */
.footer{background:var(--color-primary);color:rgba(255,255,255,0.85);padding:60px 0 0;margin-top:80px}
.footer-inner .footer-grid{display:grid;grid-template-columns:1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.1)}
@media(min-width:640px){.footer-inner .footer-grid{grid-template-columns:1fr 1fr}}
@media(min-width:1025px){.footer-inner .footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}}
.footer-brand-name{font-size:1.5rem;font-weight:var(--heading-weight);color:#fff;margin-bottom:12px;letter-spacing:var(--letter-spacing-headings)}
.footer-brand-desc{font-size:0.9rem;line-height:1.7;color:rgba(255,255,255,0.65);margin-bottom:8px}
.footer h4{font-size:0.85rem;font-weight:700;color:var(--color-accent-light);text-transform:uppercase;letter-spacing:0.04em;margin-bottom:16px}
.footer-links ul,.footer-contact ul,.footer-legal ul{display:flex;flex-direction:column;gap:12px}
.footer-link,.footer-legal-link{color:rgba(255,255,255,0.75);font-size:0.9rem;transition:color var(--transition-base)}
.footer-link:hover,.footer-legal-link:hover{color:var(--color-accent)}
.footer-contact-item{font-size:0.9rem;color:rgba(255,255,255,0.65);line-height:1.6}
.footer-contact-item a{color:rgba(255,255,255,0.85)}
.footer-contact-item a:hover{color:var(--color-accent)}
.footer-bottom{display:flex;flex-direction:column;align-items:center;gap:12px;padding:24px 0;font-size:0.82rem;color:rgba(255,255,255,0.5);text-align:center}
@media(min-width:640px){.footer-bottom{flex-direction:row;justify-content:space-between}}
.footer-slogan{font-weight:600;color:var(--color-accent-light);font-size:0.85rem;letter-spacing:0.02em}
/* ===== Button System ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;font-size:0.95rem;font-weight:600;border-radius:var(--radius-pill);border:1.5px solid transparent;cursor:pointer;transition:all var(--transition-base);font-family:var(--font-family);background:transparent;color:var(--color-text)}
.btn-primary{background:var(--color-accent);color:#fff;border-color:var(--color-accent);box-shadow:0 4px 16px rgba(255,111,60,0.25)}
.btn-primary:hover{background:var(--color-accent-light);border-color:var(--color-accent-light);box-shadow:0 6px 24px rgba(255,111,60,0.35);transform:translateY(-2px);color:#fff}
.btn-outline{border-color:var(--color-border);color:var(--color-text-medium)}
.btn-outline:hover{border-color:var(--color-accent);color:var(--color-accent);background:var(--color-hover-overlay)}
/* ===== Card ===== */
.card{background:var(--color-card-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:24px;border:1px solid var(--color-border);transition:box-shadow var(--transition-base),transform var(--transition-base)}
.card:hover{box-shadow:0 8px 32px rgba(10,37,64,0.12);transform:translateY(-4px)}
/* ===== Frame Hero ===== */
.frame-hero{position:relative;background:var(--color-card-bg);border-radius:var(--radius-card);padding:clamp(2rem,5vw,3.5rem);border:1.5px solid var(--color-border);box-shadow:var(--shadow-card);margin-bottom:40px}
.frame-hero .corner-mark{position:absolute;width:28px;height:28px;border-color:var(--color-accent);border-style:solid;border-width:0;opacity:0.7}
.frame-hero .corner-mark--tl{top:-1.5px;left:-1.5px;border-top-width:3px;border-left-width:3px;border-radius:4px 0 0 0}
.frame-hero .corner-mark--tr{top:-1.5px;right:-1.5px;border-top-width:3px;border-right-width:3px;border-radius:0 4px 0 0}
.frame-hero .corner-mark--bl{bottom:-1.5px;left:-1.5px;border-bottom-width:3px;border-left-width:3px;border-radius:0 0 0 4px}
.frame-hero .corner-mark--br{bottom:-1.5px;right:-1.5px;border-bottom-width:3px;border-right-width:3px;border-radius:0 0 4px 0}
/* ===== Section ===== */
.section{padding:60px 0}
.section-title{font-size:clamp(1.5rem,3.5vw,2.5rem);font-weight:var(--heading-weight);margin-bottom:12px;color:var(--color-primary)}
.section-subtitle{font-size:1rem;color:var(--color-text-medium);margin-bottom:40px;max-width:60ch}
/* ===== Breadcrumb ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:16px 0;font-size:0.85rem;color:var(--color-text-light)}
.breadcrumb-item{display:flex;align-items:center;gap:8px}
.breadcrumb-item+.breadcrumb-item::before{content:"/";color:var(--color-border)}
.breadcrumb-link{color:var(--color-text-medium);transition:color var(--transition-base)}
.breadcrumb-link:hover{color:var(--color-accent)}
.breadcrumb-item[aria-current="page"]{color:var(--color-text);font-weight:600}
/* ===== Badge & Tag ===== */
.badge{display:inline-flex;align-items:center;padding:4px 14px;font-size:0.75rem;font-weight:600;border-radius:var(--radius-pill);background:var(--color-silver);color:var(--color-text-medium)}
.badge--accent{background:var(--color-accent);color:#fff}
.tag{display:inline-flex;padding:4px 12px;font-size:0.75rem;border-radius:6px;border:1px solid var(--color-border);color:var(--color-text-light);background:var(--color-warm-white)}
/* ===== Divider ===== */
.divider{height:1px;background:var(--color-border);border:none;margin:40px 0}
/* ===== Text Utilities ===== */
.text-accent{color:var(--color-accent)}
.text-center{text-align:center}
.text-muted{color:var(--color-text-light)}
/* ===== Responsive Grid ===== */
.grid-2{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:640px){.grid-2{grid-template-columns:1fr 1fr}}
.grid-3{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:640px){.grid-3{grid-template-columns:1fr 1fr}}
@media(min-width:1025px){.grid-3{grid-template-columns:1fr 1fr 1fr}}
/* ===== Generic Container for Main ===== */
.page-main{padding-top:calc(var(--header-height) + 24px);min-height:80vh}
/* ===== Image Placeholder Base ===== */
.img-placeholder{display:flex;align-items:center;justify-content:center;background:var(--color-silver);border-radius:12px;color:var(--color-text-light);font-size:0.85rem;aspect-ratio:16/9;width:100%}
/* ===== Motion: Reduced ===== */
@media(prefers-reduced-motion:reduce){
  .nav-link,.btn,.card,.compare-link,.version-btn{transition:none!important;transform:none!important}
}