:root{
  color-scheme: light dark;

  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;

  --text-strong: #0f172a;
  --text-body: #1f2937;
  --text-muted: #4b5563;
  --accent: #2563eb;
  --surface: rgba(255,255,255,0.24);
  --surface-border: rgba(15,23,42,0.05);
  --surface-shadow: 0 28px 60px -36px rgba(15,23,42,0.3);
  --surface-hover: rgba(255,255,255,0.33);

  --bg-overlay: rgba(255,255,255,0.0);
  --bg-fallback: #ebf4ff;

  --page-top-spacing: clamp(120px, 16vw, 200px);

  --header-fg: #f8fafc;
  --header-border: rgba(255,255,255,0.15);
  --header-shadow: 0 2px 14px rgba(15,23,42,0.25);

  --toggle-bg: rgba(15,23,42,0.12);
  --toggle-bg-hover: rgba(15,23,42,0.22);
  --toggle-border: rgba(15,23,42,0.16);
  --toggle-icon-shadow: drop-shadow(0 2px 10px rgba(15,23,42,0.25));

  --bg-image: var(--bg-image-light);
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme]){
    --text-strong: #e2e8f0;
    --text-body: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #93c5fd;
    --surface: rgba(13,23,45,0.5);
    --surface-hover: rgba(18,30,54,0.54);
    --surface-border: rgba(148,163,184,0.12);
    --surface-shadow: 0 28px 60px -32px rgba(0,0,0,0.55);
    --bg-overlay: rgba(8,15,35,0.08);
    --bg-fallback: #0f172a;
    --page-top-spacing: clamp(132px, 20vw, 220px);
    --header-fg: #f8fafc;
    --header-border: rgba(255,255,255,0.18);
    --header-shadow: 0 2px 16px rgba(0,0,0,0.65);
    --toggle-bg: rgba(255,255,255,0.16);
    --toggle-bg-hover: rgba(255,255,255,0.26);
    --toggle-border: rgba(255,255,255,0.2);
    --toggle-icon-shadow: drop-shadow(0 2px 12px rgba(0,0,0,0.6));
    --bg-image: var(--bg-image-dark);
  }
}

:root[data-theme="light"]{
  --text-strong: #0f172a;
  --text-body: #1f2937;
  --text-muted: #4b5563;
  --accent: #2563eb;
  --surface: rgba(255,255,255,0.24);
  --surface-hover: rgba(255,255,255,0.33);
  --surface-border: rgba(15,23,42,0.05);
  --surface-shadow: 0 28px 60px -36px rgba(15,23,42,0.3);
  --bg-overlay: rgba(255,255,255,0.0);
  --bg-fallback: #ebf4ff;
  --page-top-spacing: clamp(120px, 16vw, 200px);
  --header-fg: #f8fafc;
  --header-border: rgba(255,255,255,0.15);
  --header-shadow: 0 2px 14px rgba(15,23,42,0.25);
  --toggle-bg: rgba(15,23,42,0.12);
  --toggle-bg-hover: rgba(15,23,42,0.22);
  --toggle-border: rgba(15,23,42,0.16);
  --toggle-icon-shadow: drop-shadow(0 2px 10px rgba(15,23,42,0.25));
  --bg-image: var(--bg-image-light);
}

:root[data-theme="dark"]{
  --text-strong: #e2e8f0;
  --text-body: #e5e7eb;
  --text-muted: #94a3b8;
  --accent: #93c5fd;
  --surface: rgba(13,23,45,0.5);
  --surface-hover: rgba(18,30,54,0.68);
  --surface-border: rgba(148,163,184,0.12);
  --surface-shadow: 0 28px 60px -32px rgba(0,0,0,0.55);
  --bg-overlay: rgba(8,15,35,0.08);
  --bg-fallback: #0f172a;
  --page-top-spacing: clamp(132px, 20vw, 220px);
  --header-fg: #f8fafc;
  --header-border: rgba(255,255,255,0.18);
  --header-shadow: 0 2px 16px rgba(0,0,0,0.65);
  --toggle-bg: rgba(255,255,255,0.16);
  --toggle-bg-hover: rgba(255,255,255,0.26);
  --toggle-border: rgba(255,255,255,0.2);
  --toggle-icon-shadow: drop-shadow(0 2px 12px rgba(0,0,0,0.6));
  --bg-image: var(--bg-image-dark);
}

*{
  box-sizing: border-box;
}

html, body{
  margin:0;
  padding:0;
  min-height:100%;
  font:16px/1.6 var(--font-sans);
  color: var(--text-body);
}

html{
  background: var(--bg-fallback);
}

body{
  position:relative;
  background-color: var(--bg-fallback);
  background-image:
    linear-gradient(180deg, var(--bg-overlay), var(--bg-overlay)),
    var(--bg-image);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center top;
  background-attachment: fixed;
}

@media (min-width: 769px){
  .mobile-menu-toggle{
    display:none;
  }
  .main-nav{
    display:flex;
  }
}

@media (max-width: 768px){
  body{
    background-position: center top;
    background-size: cover;
    background-attachment: scroll;
  }
  .main-nav{
    display:none !important;
  }
  .mobile-menu-toggle{
    display:flex;
  }
  .site-header__controls{
    gap:16px;
  }
  .theme-toggle{
    margin-left:0;
  }
}

.shell{
  width:min(1120px, 100%);
  margin:0 auto;
  padding:0 clamp(16px, 4vw, 48px);
}

.site-header{
  position:sticky;
  top:0;
  left:0;
  right:0;
  z-index:30;
  width:100%;
  color: var(--header-fg);
  background: transparent;
  border-bottom:none;
  transform: translateY(0);
  transition: transform .3s ease, opacity .3s ease;
  opacity:1;
}

.site-header.is-hidden{
  transform: translateY(-120%);
  opacity:0;
  pointer-events:none;
}

.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:flex-start;
  gap: clamp(20px, 3vw, 32px);
  width:100%;
  max-width:min(1120px, 100%);
  margin:0 auto;
  padding: clamp(16px, 3vw, 26px) clamp(16px, 4vw, 48px);
  box-sizing:border-box;
}

.brand{
  text-decoration:none;
  display:flex;
  align-items:center;
  flex-shrink:0;
}

.brand-logo{
  display:block;
  height:60px;
  width:auto;
  mix-blend-mode:screen;
}


.site-header__controls{
  margin-left: clamp(16px, 3vw, 40px);
  display:flex;
  align-items:center;
  gap:18px;
}

.main-nav{
  display:flex;
  align-items:center;
  gap:24px;
  margin-left:auto;
}

.main-nav a{
  color:inherit;
  font-weight:600;
  text-decoration:none;
  opacity:0.9;
  transition: opacity .2s ease;
  text-shadow: var(--header-shadow);
}

.main-nav a:hover,
.main-nav a:focus-visible{
  opacity:1;
}

.theme-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  border-radius:50%;
  border:1px solid var(--toggle-border);
  background: var(--toggle-bg);
  color:inherit;
  cursor:pointer;
  transition: background .2s ease, transform .2s ease;
  box-shadow:0 14px 30px -20px rgba(15,23,42,0.65);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  margin-left:12px;
}

.mobile-menu-toggle{
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:5px;
  width:44px;
  height:44px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,0.24);
  background: rgba(6,17,38,0.55);
  color:inherit;
  cursor:pointer;
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
}

.mobile-menu-toggle:hover{
  transform: translateY(-1px);
  background: rgba(6,17,38,0.65);
}

.mobile-menu-toggle:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

.mobile-menu-toggle__line{
  display:block;
  width:20px;
  height:2px;
  border-radius:999px;
  background: currentColor;
  transition: transform .2s ease, opacity .2s ease;
}

.mobile-menu-toggle__line + .mobile-menu-toggle__line{
  margin-top:0;
}

.mobile-menu-toggle.is-open .mobile-menu-toggle__line:nth-child(1){
  transform: translateY(5px) rotate(45deg);
}

.mobile-menu-toggle.is-open .mobile-menu-toggle__line:nth-child(2){
  opacity:0;
}

.mobile-menu-toggle.is-open .mobile-menu-toggle__line:nth-child(3){
  transform: translateY(-5px) rotate(-45deg);
}

.mobile-menu{
  position:fixed;
  inset:0;
  z-index:40;
  pointer-events:none;
  opacity:0;
  transition: opacity .25s ease;
}

.mobile-menu__backdrop{
  position:absolute;
  inset:0;
  background: rgba(4,12,24,0.55);
  backdrop-filter: blur(6px);
  opacity:0;
  transition: opacity .25s ease;
}

.mobile-menu__panel{
  position:absolute;
  top:0;
  right:0;
  width:min(320px, 80vw);
  height:100%;
  padding:32px 28px;
  display:flex;
  flex-direction:column;
  gap:18px;
  background: rgba(8,18,40,0.92);
  border-left:1px solid rgba(255,255,255,0.12);
  transform: translateX(16px);
  opacity:0;
  transition: transform .25s ease, opacity .25s ease;
}

.mobile-menu.is-open{
  pointer-events:auto;
  opacity:1;
}

.mobile-menu.is-open .mobile-menu__backdrop{
  opacity:1;
}

.mobile-menu.is-open .mobile-menu__panel{
  transform: translateX(0);
  opacity:1;
}

.mobile-nav{
  display:flex;
  flex-direction:column;
  gap:18px;
}

.mobile-nav a{
  color:#f8fafc;
  font-weight:600;
  text-decoration:none;
  font-size:1.05rem;
}

.mobile-nav a:focus-visible,
.mobile-nav a:hover{
  text-decoration:underline;
}

body.menu-open{
  overflow:hidden;
}

.theme-toggle:hover{
  background: var(--toggle-bg-hover);
  transform: translateY(-1px);
}

.theme-toggle:active{
  transform: scale(.96);
}

.theme-toggle span::before{
  content:"☀️";
  display:block;
  font-size:1.2rem;
  filter: var(--toggle-icon-shadow);
}

.theme-toggle[data-mode="dark"] span::before{
  content:"🌙";
}

.page{
  padding: var(--page-top-spacing) 0 200px;
  min-height: calc(100vh - 120px);
  position:relative;
}

.page > *{
  margin-bottom:56px;
}

.hero{
  text-align:center;
  color: var(--text-strong);
  padding:48px 0 24px;
}

.hero .eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 14px;
  border-radius:999px;
  font-size:0.85rem;
  font-weight:600;
  background: rgba(255,255,255,0.6);
  color: var(--accent);
  border:1px solid rgba(37,99,235,0.1);
  box-shadow:0 16px 34px -24px rgba(37,99,235,0.6);
}

.hero h1{
  margin:24px auto 16px;
  font-size: clamp(2.8rem, 5vw, 4rem);
  line-height:1.05;
  font-weight:800;
  max-width: 680px;
}

.hero p{
  margin:0 auto;
  max-width: 640px;
  color: var(--text-muted);
  font-size:1.05rem;
}

.hero-actions{
  margin-top:28px;
  display:flex;
  justify-content:center;
  gap:16px;
  flex-wrap:wrap;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 22px;
  border-radius:999px;
  font-weight:600;
  text-decoration:none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.btn-primary{
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color:#fff;
  box-shadow:0 20px 45px -28px rgba(37,99,235,0.75);
}

.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 24px 50px -24px rgba(37,99,235,0.85);
}

.btn-secondary{
  background: rgba(255,255,255,0.65);
  color: var(--text-strong);
  border:1px solid rgba(37,99,235,0.18);
}

.layout-panels{
  display:grid;
  grid-template-columns: 280px 1fr;
  gap:32px;
  width:min(1120px, 100%);
  margin:0 auto 32px;
  padding:0 clamp(16px, 4vw, 48px);
  position:relative;
}

.card{
  padding:26px;
  border-radius:28px;
  background: var(--surface);
  border:1px solid var(--surface-border);
  box-shadow: var(--surface-shadow);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition: background .2s ease, box-shadow .2s ease;
}

.card:hover{
  background: var(--surface-hover);
  box-shadow: 0 36px 60px -36px rgba(15,23,42,0.35);
}

.sidebar-nav h2{
  margin-top:0;
  margin-bottom:12px;
  font-size:1rem;
  text-transform:uppercase;
  letter-spacing:0.08em;
  color: var(--text-muted);
}

.sidebar-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:12px;
}

.sidebar-nav a{
  font-weight:600;
  color: var(--text-strong);
  text-decoration:none;
}

.sidebar-nav a span{
  display:block;
  font-size:0.85rem;
  font-weight:400;
  color: var(--text-muted);
}

.primary-card h2{
  margin-top:0;
  margin-bottom:14px;
  font-size:1.35rem;
  color: var(--text-strong);
}

.primary-card p{
  margin-top:8px;
  color: var(--text-muted);
}

.primary-card ul{
  list-style:none;
  margin:20px 0 0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:14px;
}

.primary-card li{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
}

.primary-card li span{
  color: var(--text-muted);
  font-size:0.9rem;
}

.post-grid{
  margin-top:24px;
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap:18px;
}

.post-tile{
  padding:18px;
  border-radius:20px;
  background: var(--surface);
  border:1px solid var(--surface-border);
  color: var(--text-strong);
  text-decoration:none;
  display:flex;
  flex-direction:column;
  gap:6px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.post-tile:hover{
  background: var(--surface-hover);
  transform:translateY(-2px);
  box-shadow:0 18px 40px -30px rgba(15,23,42,0.45);
}

.post-tile span{
  font-size:0.85rem;
  color: var(--text-body);
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme]) .post-tile{
    border-color: rgba(148,163,184,0.28);
    box-shadow: 0 0 0 1px rgba(148,163,184,0.06),
                0 4px 18px -6px rgba(80,140,255,0.18),
                inset 0 1px 0 rgba(255,255,255,0.06);
  }
}

:root[data-theme="dark"] .post-tile{
  border-color: rgba(148,163,184,0.28);
  box-shadow: 0 0 0 1px rgba(148,163,184,0.06),
              0 4px 18px -6px rgba(80,140,255,0.18),
              inset 0 1px 0 rgba(255,255,255,0.06);
}

.site-footer{
  margin-top:48px;
  padding:28px 0 36px;
  color: var(--text-muted);
  font-size:0.9rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position:relative;
  z-index:1;
}

.site-footer::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background: linear-gradient(0deg, rgba(0,0,0,0.25), rgba(0,0,0,0));
  opacity:0.45;
  z-index:-1;
}

.site-footer .shell{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:18px;
}

@media (max-width: 900px){
  .layout-panels{
    grid-template-columns: 1fr;
  }
  .card{
    padding:22px;
  }
}

@media (max-width: 640px){
  :root{
    --page-top-spacing: clamp(140px, 28vw, 240px);
  }
  .shell{
    padding:0 20px;
  }
  .layout-panels{
    width:100%;
    padding:0 20px;
    margin:0 auto 28px;
    gap:20px;
  }
  .site-header__inner{
    flex-wrap:nowrap;
    justify-content:space-between;
    align-items:center;
    gap:12px;
    padding:8px 20px;
    margin:0;
  }
  .site-header__controls{
    margin-left:16px;
    gap:12px;
  }
  .mobile-menu-toggle{
    width:42px;
    height:42px;
  }
  .theme-toggle{
    width:42px;
    height:42px;
  }
  .brand-logo{
    height:48px;
  }
  .main-nav{
    gap:14px;
    flex-wrap:wrap;
  }
  .hero{
    padding-top:32px;
  }
  .hero h1{
    font-size: clamp(2.2rem, 9vw, 3.2rem);
  }
  .layout-panels{
    padding:0 20px;
  }