/* =========================
   RESET / CLEANUP
========================= */

*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}

/* Remove overlays */
html::before,
html::after,
body::before,
body::after{
  content:none !important;
  background:none !important;
  display:none !important;
}

/* =========================
   ROOT HEIGHT FIX
========================= */

html,
body{
  width:100%;
  height:100%;
  min-height:100%;
}


/* =========================
   THEME VARIABLES
========================= */

:root{
  /* LIGHT MODE */
  --bg1:#ffffff;
  --bg2:#ffffff;

  --text:#0a0a0a;
  --muted: rgba(10,10,10,.64);

  --primary:#2563eb;
  --primary2:#60a5fa;

  --border: rgba(10,10,10,.10);
  --shadow: 0 18px 55px rgba(0,0,0,.08);

  --card: rgba(255,255,255,.78);
  --blur: blur(14px);

  --radius: 18px;

  color-scheme: light;
}

/* DARK MODE */
[data-theme="dark"]{
  --bg1:#07080c;
  --bg2:#07080c;

  --text:#f5f6ff;
  --muted: rgba(245,246,255,.70);

  --primary:#3b82f6;
  --primary2:#60a5fa;

  --border: rgba(255,255,255,.10);
  --shadow: 0 22px 70px rgba(0,0,0,.45);

  --card: rgba(16,18,28,.72);

  color-scheme: dark;
}


/* =========================
   BODY BACKGROUND
========================= */

body{
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  color: var(--text);

  min-height:100%;
  height:auto;

  overflow-x:hidden;

  background: var(--bg1);

  transition:
    background .25s ease,
    color .25s ease;
}

/* DARK = living background */
[data-theme="dark"] body{
  background:
    radial-gradient(1100px 700px at 15% -10%, rgba(59,130,246,.22) 0%, transparent 70%),
    radial-gradient(1000px 650px at 85% 0%, rgba(96,165,250,.16) 0%, transparent 72%),
    radial-gradient(1400px 900px at 50% 35%, rgba(0,0,0,.35) 0%, transparent 70%),
    radial-gradient(1200px 700px at 50% 115%, rgba(59,130,246,.18) 0%, transparent 70%),
    linear-gradient(180deg,var(--bg1) 0%,var(--bg2) 100%);

  background-repeat:no-repeat;
  background-size:cover;
  background-attachment:fixed;
}


/* =========================
   LAYOUT
========================= */

.container{
  max-width:980px;
  margin:0 auto;
  padding:18px;
}


/* =========================
   HEADER
========================= */

.site-header{
  position:sticky;
  top:0;
  z-index:50;

  background: var(--card);

  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);

  border-bottom:1px solid var(--border);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;

  padding:14px 0;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;

  font-weight:800;
  letter-spacing:.3px;
  color:var(--text);
}

.brand img{
  width:26px;
  height:26px;
  object-fit:contain;
}

/* Header right */
.header-right{
  display:flex;
  align-items:center;
  gap:12px;
}


/* =========================
   THEME TOGGLE
========================= */

.theme-toggle{
  appearance:none;
  -webkit-appearance:none;

  display:inline-flex;
  align-items:center;
  justify-content:center;

  width:42px;
  height:42px;

  border-radius:12px;

  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);

  border:1px solid rgba(0,0,0,0.03);

  box-shadow:
    0 2px 6px rgba(0,0,0,0.06);

  font-size:18px;
  cursor:pointer;
}

.theme-toggle:hover{
  transform: translateY(-1px);
  box-shadow:
    0 4px 10px rgba(0,0,0,0.10);
}

.theme-toggle:active{
  transform: scale(0.96);
}

/* Dark Mode Button */
[data-theme="dark"] .theme-toggle{
  background: rgba(18,20,28,0.95);

  border:1px solid rgba(255,255,255,0.04);

  box-shadow:
    0 2px 8px rgba(0,0,0,0.5);
}


/* =========================
   NAV
========================= */

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

.nav-link{
  text-decoration:none;
  color:var(--text);

  font-weight:600;
  font-size:14px;

  padding:9px 14px;
  border-radius:999px;

  transition:.18s ease;

  border:1px solid transparent;
}

.nav-link:hover{
  background:rgba(37,99,235,.08);
  border-color:rgba(37,99,235,.18);
}

.nav-link.active{
  background:linear-gradient(135deg,var(--primary),var(--primary2));
  color:#fff;

  box-shadow:0 12px 30px rgba(37,99,235,.25);
  border-color:rgba(37,99,235,.25);
}


/* =========================
   CARD
========================= */

.card{
  margin-top:26px;

  background:var(--card);

  border:1px solid var(--border);
  border-radius:var(--radius);

  box-shadow:var(--shadow);

  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);

  padding:34px;
}


/* =========================
   TITLES
========================= */

.page-title{
  text-align:center;

  margin:0 0 12px;

  font-size:34px;
  line-height:1.2;
}

.page-subtitle{
  text-align:center;

  margin:0 0 26px;

  color:var(--muted);
  font-size:15px;
}


/* =========================
   SECTIONS
========================= */

.section-grid{
  display:grid;
  grid-template-columns:1fr;

  gap:14px;
  margin-top:18px;
}

.section{
  background:var(--card);

  border:1px solid var(--border);
  border-radius:16px;

  padding:18px;

  box-shadow:0 10px 25px rgba(0,0,0,.15);

  backdrop-filter:var(--blur);
}

.section h3{
  margin:0 0 8px;

  font-size:18px;

  display:flex;
  align-items:center;
  gap:10px;
}

.section p,
.section ul{
  color:var(--text);
}

.section p{
  margin:8px 0;
  line-height:1.7;
}

.section ul{
  margin:10px 0 0 18px;
}

.section li{
  margin:6px 0;
}


/* =========================
   BADGE
========================= */

.badge{
  display:inline-flex;
  align-items:center;
  justify-content:center;

  font-size:12px;
  font-weight:700;

  padding:5px 10px;

  border-radius:999px;

  background:rgba(37,99,235,.10);
  color:var(--primary2);

  border:1px solid rgba(37,99,235,.18);
}


/* =========================
   MAIL LINK
========================= */

.mail-link{
  display:inline-flex;
  align-items:center;
  gap:10px;

  padding:10px 14px;

  border-radius:12px;

  border:1px solid rgba(37,99,235,.20);
  background:rgba(37,99,235,.08);

  color:var(--primary2);
  text-decoration:none;
  font-weight:700;

  transition:.18s ease;
}

.mail-link:hover{
  transform:translateY(-1px);

  background:rgba(37,99,235,.12);

  box-shadow:0 12px 26px rgba(37,99,235,.18);
}

.mail-link .icon{
  width:34px;
  height:34px;

  border-radius:10px;

  display:inline-flex;
  align-items:center;
  justify-content:center;

  background:linear-gradient(135deg,var(--primary),var(--primary2));
  color:#fff;

  font-size:16px;
}


/* =========================
   FOOTER
========================= */

.site-footer{
  margin-top:26px;
  padding:18px 0 40px;

  color:var(--muted);

  text-align:center;
  font-size:14px;
}


/* =========================
   MOBILE
========================= */

@media (max-width:640px){

  .card{
    padding:22px;
  }

  .page-title{
    font-size:28px;
  }

  .header-inner{
    flex-direction:column;
    align-items:flex-start;
  }

  .header-right{
    width:100%;
    justify-content:space-between;
  }

  .nav{
    width:100%;
    flex-wrap:wrap;
  }

}