/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:100%}
body{font-family:'Inter',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;background:#F5F7FA;color:#0B1D3A;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:#0B1D3A;text-decoration:none;transition:color .2s,background .2s}
a:hover,a:focus-visible{color:#FF6B35}
:focus-visible{outline:2px solid #FF6B35;outline-offset:2px}
img{max-width:100%;display:block}
ul{list-style:none}
h1,h2,h3,h4{font-family:'Playfair Display',Georgia,serif;font-weight:700;line-height:1.2}
h1{font-size:3.5rem}
h2{font-size:2.5rem}
h3{font-size:1.75rem}
small,.small{font-size:0.875rem;color:#4A5568}
code,.mono{font-family:'JetBrains Mono',monospace}

/* Variables */
:root{
  --color-primary:#0B1D3A;
  --color-primary-light:#1A3A6B;
  --color-primary-dark:#061126;
  --color-accent:#FF6B35;
  --color-accent-light:#FF8C5A;
  --color-white:#FFFFFF;
  --color-gray-light:#F5F7FA;
  --color-gray-medium:#A0AEC0;
  --color-text:#0B1D3A;
  --color-text-secondary:#4A5568;
  --color-bg:#F5F7FA;
  --color-card:#FFFFFF;
  --color-dark-bg:#0B1D3A;
  --font-heading:'Playfair Display',Georgia,serif;
  --font-body:'Inter',sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --max-width:1280px;
  --header-height:70px;
  --transition:0.25s ease;
}

/* Skip Link */
.skip-link{position:absolute;top:-100%;left:1rem;padding:0.5rem 1rem;background:#0B1D3A;color:#fff;z-index:10000;border-radius:0 0 4px 4px;font-weight:600}
.skip-link:focus{top:0}

/* Site Wrapper */
.site-wrapper{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}
@media(min-width:768px){.site-wrapper{padding:0 2rem}}
@media(min-width:1280px){.site-wrapper{padding:0 3rem}}

/* Header */
.site-header{position:fixed;top:0;left:0;width:100%;height:var(--header-height);background:var(--color-dark-bg);color:#fff;z-index:1000;box-shadow:0 2px 8px rgba(0,0,0,0.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.header-brand{display:flex;align-items:center;gap:0.75rem}
.header-logo{font-family:var(--font-heading);font-weight:900;font-size:1.4rem;color:#fff;letter-spacing:0.02em}
.header-logo:hover,.header-logo:focus-visible{color:var(--color-accent)}
.header-slogan{display:none;font-size:0.85rem;color:var(--color-gray-medium);border-left:1px solid rgba(255,255,255,0.2);padding-left:0.75rem}
@media(min-width:640px){.header-slogan{display:inline-block}}

/* Navigation Toggle (hamburger) */
.nav-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;width:36px;height:36px;background:transparent;border:2px solid transparent;cursor:pointer;padding:4px;transition:border-color var(--transition)}
.nav-toggle-bar{display:block;height:2px;background:#fff;border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--color-accent)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(min-width:900px){.nav-toggle{display:none}}

/* Nav Menu */
.nav-menu{position:fixed;top:var(--header-height);left:0;width:100%;height:calc(100dvh - var(--header-height));background:var(--color-dark-bg);transform:translateX(100%);transition:transform .35s ease;overflow-y:auto;z-index:999}
.nav-menu[data-open]{transform:translateX(0)}
.nav-list{display:flex;flex-direction:column;padding:1.5rem;gap:0}
.nav-item a{display:block;padding:0.75rem 1rem;color:rgba(255,255,255,0.85);font-size:1rem;font-weight:500;border-bottom:1px solid rgba(255,255,255,0.1);transition:background .2s,color .2s;position:relative}
.nav-item a:hover,.nav-item a:focus-visible{background:rgba(255,107,53,0.15);color:#fff}
.nav-item a[aria-current="page"]{color:var(--color-accent);font-weight:600}
.nav-item a[aria-current="page"]::after{content:'';position:absolute;bottom:0;left:1rem;right:1rem;height:2px;background:var(--color-accent)}
@media(min-width:900px){
  .nav-menu{position:static;display:block;height:auto;width:auto;background:transparent;transform:none;overflow:visible}
  .nav-list{flex-direction:row;padding:0;gap:0.25rem}
  .nav-item a{padding:0.5rem 0.75rem;border-bottom:none;border-radius:4px}
  .nav-item a[aria-current="page"]::after{height:3px;left:0;right:0;bottom:-2px;background:var(--color-accent)}
}

/* Main content offset */
#main-content{padding-top:var(--header-height)}

/* Footer */
.site-footer{background:var(--color-dark-bg);color:rgba(255,255,255,0.85);padding:3rem 0 1.5rem;margin-top:4rem}
.footer-inner{display:grid;grid-template-columns:1fr;gap:2rem}
@media(min-width:768px){.footer-inner{grid-template-columns:2fr 1fr 1fr}}
.footer-column{}
.footer-logo{font-family:var(--font-heading);font-weight:900;font-size:1.3rem;color:#fff}
.footer-desc{margin:0.75rem 0;line-height:1.6;font-size:0.95rem;color:rgba(255,255,255,0.7)}
.footer-trust{margin-top:1rem;padding:0.75rem;background:rgba(255,255,255,0.08);border-radius:6px;font-size:0.85rem;line-height:1.5}
.footer-heading{font-family:var(--font-heading);font-weight:700;font-size:1.1rem;color:#fff;margin-bottom:1rem;border-bottom:1px solid rgba(255,255,255,0.15);padding-bottom:0.5rem}
.footer-nav,.footer-contact{display:flex;flex-direction:column;gap:0.5rem}
.footer-nav a,.footer-contact a{color:rgba(255,255,255,0.7);font-size:0.95rem;transition:color .2s}
.footer-nav a:hover,.footer-contact a:hover,.footer-nav a:focus-visible,.footer-contact a:focus-visible{color:var(--color-accent)}
.footer-contact li{font-size:0.9rem;color:rgba(255,255,255,0.7)}
.footer-bottom{margin-top:2.5rem;padding-top:1.25rem;border-top:1px solid rgba(255,255,255,0.1);text-align:center}
.footer-bottom p{font-size:0.85rem;color:rgba(255,255,255,0.5)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:0.6rem 1.5rem;font-family:var(--font-body);font-weight:600;font-size:0.95rem;border:none;border-radius:6px;background:var(--color-primary);color:#fff;cursor:pointer;transition:background .25s,transform .15s,box-shadow .25s}
.btn:hover,.btn:focus-visible{background:var(--color-accent);transform:translateY(-1px);box-shadow:0 4px 12px rgba(255,107,53,0.3)}
.btn--outline{background:transparent;border:2px solid var(--color-accent);color:var(--color-accent)}
.btn--outline:hover{background:var(--color-accent);color:#fff}

/* Breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;gap:0.25rem;align-items:center;font-size:0.85rem;color:var(--color-gray-medium);padding:0.75rem 0}
.breadcrumb a{color:var(--color-text-secondary)}
.breadcrumb a:hover{color:var(--color-accent)}
.breadcrumb span.sep{margin:0 0.25rem;color:var(--color-gray-medium)}

/* Progress Bar (scroll) */
.progress-bar{position:fixed;top:var(--header-height);left:0;width:0;height:3px;background:linear-gradient(90deg,var(--color-accent),var(--color-accent-light));z-index:999;transition:width 0.1s linear;will-change:width;pointer-events:none}

/* Card */
.card{background:var(--color-card);border-radius:12px;padding:1.5rem;box-shadow:0 2px 8px rgba(0,0,0,0.06);transition:box-shadow .3s,transform .3s;border:1px solid transparent}
.card:hover{box-shadow:0 8px 24px rgba(0,0,0,0.1);transform:translateY(-2px);border-color:rgba(255,107,53,0.2)}

/* Section Number */
.section-number{display:inline-block;font-family:var(--font-mono);font-size:1.4rem;font-weight:700;color:var(--color-accent);margin-right:0.75rem;vertical-align:middle;line-height:1}

/* Tag */
.tag{display:inline-block;font-size:0.75rem;font-weight:600;padding:0.2rem 0.6rem;background:var(--color-accent);color:#fff;border-radius:4px;text-transform:uppercase;letter-spacing:0.04em}

/* Image Placeholder */
.image-placeholder{position:relative;display:block;width:100%;padding-bottom:56.25%;background:linear-gradient(135deg,var(--color-primary-light),var(--color-dark-bg));border-radius:8px;overflow:hidden}
.image-placeholder::after{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='rgba(160,174,192,0.4)' stroke-width='1.5'%3E%3Cpath d='M21 12a9 9 0 11-18 0 9 9 0 0118 0z'/%3E%3Cpath d='M12 8v4l3 3'/%3E%3C/svg%3E") center/3rem no-repeat;pointer-events:none}

/* Data table */
.data-table{width:100%;border-collapse:collapse;font-size:0.95rem;background:var(--color-card);border-radius:8px;overflow:hidden}
.data-table th,.data-table td{padding:0.75rem 1rem;text-align:left;border-bottom:1px solid rgba(0,0,0,0.05)}
.data-table th{background:var(--color-dark-bg);color:#fff;font-family:var(--font-body);font-weight:600;font-size:0.85rem;text-transform:uppercase;letter-spacing:0.03em}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:nth-child(even) td{background:rgba(245,247,250,0.5)}
.data-table td.mono{font-family:var(--font-mono);font-weight:500}

/* Accordion */
[data-accordion]{border-bottom:1px solid rgba(0,0,0,0.08)}
[data-accordion] .accordion-trigger{display:flex;align-items:center;justify-content:space-between;width:100%;padding:1rem 0;background:transparent;border:none;font-family:var(--font-body);font-weight:600;font-size:1rem;cursor:pointer;text-align:left;color:var(--color-text)}
[data-accordion] .accordion-trigger::after{content:'';width:0;height:0;border-left:6px solid transparent;border-right:6px solid transparent;border-top:8px solid var(--color-accent);transition:transform .3s}
[data-accordion][data-open] .accordion-trigger::after{transform:rotate(180deg)}
[data-accordion] .accordion-content{overflow:hidden;max-height:0;padding:0 0.5rem;transition:max-height .4s ease,padding .4s ease}
[data-accordion][data-open] .accordion-content{max-height:500px;padding:0 0.5rem 1rem}

/* Back to top */
.back-to-top{position:fixed;bottom:2rem;right:2rem;width:44px;height:44px;border-radius:50%;background:var(--color-dark-bg);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(0,0,0,0.15);cursor:pointer;opacity:0;transform:translateY(20px);transition:opacity .35s,transform .35s;z-index:999;border:2px solid transparent}
.back-to-top.visible{opacity:1;transform:translateY(0)}
.back-to-top:hover,.back-to-top:focus-visible{background:var(--color-accent);border-color:var(--color-accent);outline:none}

/* Reduced motion */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0ms!important;animation-duration:0ms!important}
  .nav-menu{transition:none}
  .back-to-top{transition:opacity 0.1s}
  html{scroll-behavior:auto}
}

/* Responsive adjustments */
@media(max-width:767px){
  h1{font-size:2.2rem}
  h2{font-size:1.8rem}
  h3{font-size:1.3rem}
  .section-number{font-size:1.1rem}
}
@media(min-width:768px){
  .header-slogan{display:inline-block}
}