/* ============================================================
   Design tokens — "Circuit" theme for a software-student portfolio
   ============================================================ */
:root{
  --bg-void:      #070b14;   /* deepest background */
  --bg-panel:     #0d1526;   /* card / panel surface */
  --bg-panel-2:   #121d34;   /* raised surface, hovers */
  --line:         #1e2b46;   /* hairline borders */
  --line-soft:    #16213a;

  --text-hi:      #eef2fb;   /* headings */
  --text-mid:     #aeb9d4;   /* body */
  --text-low:     #6c7896;   /* captions, meta */

  --accent:       #4f8cff;   /* circuit blue — primary */
  --accent-2:     #7c6fee;   /* violet — secondary */
  --accent-glow:  rgba(79,140,255,.35);
  --ok:           #34d399;

  --radius:       14px;
  --radius-sm:    9px;

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body:    "Inter", sans-serif;
  --font-mono:    "JetBrains Mono", monospace;

  --maxw: 1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg-void);
  color:var(--text-mid);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

/* ambient circuit-board backdrop */
body::before{
  content:"";
  position:fixed; inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(circle at 15% 8%,  rgba(79,140,255,.10), transparent 40%),
    radial-gradient(circle at 85% 92%, rgba(124,111,238,.10), transparent 40%),
    linear-gradient(var(--bg-void),var(--bg-void));
}
body::after{
  content:"";
  position:fixed; inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.35;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 20%, transparent 75%);
}

a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }
h1,h2,h3,h4{ font-family:var(--font-display); color:var(--text-hi); margin:0 0 .4em; letter-spacing:-.01em; }
p{ margin:0 0 1em; }
.container{ max-width:var(--maxw); margin:0 auto; padding:0 28px; position:relative; z-index:1; }
.eyebrow{
  font-family:var(--font-mono); font-size:12.5px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent); display:inline-flex; align-items:center; gap:8px;
}
.eyebrow::before{ content:""; width:7px; height:7px; border-radius:2px; background:var(--accent); box-shadow:0 0 10px var(--accent-glow); display:inline-block; }

/* ---------- Nav ---------- */
.site-nav{
  position:sticky; top:0; z-index:50;
  background:rgba(7,11,20,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.site-nav .container{ display:flex; align-items:center; justify-content:space-between; height:68px; }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; color:var(--text-hi); font-size:18px; }
.brand-mark{
  width:34px; height:34px; border-radius:9px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-weight:700; color:#fff; font-size:15px;
  box-shadow:0 0 22px var(--accent-glow);
}
.nav-links{ display:flex; align-items:center; gap:2px; list-style:none; margin:0; padding:0; }
.nav-links a{
  padding:9px 16px; border-radius:8px; font-size:14.5px; color:var(--text-mid);
  transition:background .15s, color .15s;
}
.nav-links a:hover{ color:var(--text-hi); background:var(--bg-panel-2); }
.nav-links a.active{ color:var(--accent); background:rgba(79,140,255,.10); }
.nav-links a.admin-link{ color:var(--text-low); border:1px solid var(--line); }
.nav-toggle{ display:none; background:none; border:1px solid var(--line); color:var(--text-hi); border-radius:8px; width:40px; height:40px; }

@media (max-width:880px){
  .nav-links{
    position:fixed; top:68px; left:0; right:0; bottom:0;
    background:var(--bg-void); flex-direction:column; align-items:stretch;
    padding:18px; gap:6px; transform:translateX(100%); transition:transform .25s ease;
    border-top:1px solid var(--line);
  }
  .nav-links.open{ transform:translateX(0); }
  .nav-links a{ padding:14px 16px; font-size:16px; }
  .nav-toggle{ display:block; }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  padding:12px 22px; border-radius:10px; font-weight:600; font-size:14.5px;
  border:1px solid transparent; cursor:pointer; transition:transform .15s, box-shadow .15s, background .15s, border-color .15s;
  font-family:var(--font-body);
}
.btn-primary{ background:linear-gradient(135deg,var(--accent),var(--accent-2)); color:#fff; box-shadow:0 8px 24px -8px var(--accent-glow); }
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 12px 28px -8px var(--accent-glow); }
.btn-ghost{ background:var(--bg-panel-2); color:var(--text-hi); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--accent); color:var(--accent); }
.btn-sm{ padding:8px 14px; font-size:13px; }
.btn-danger{ background:transparent; color:#f87171; border-color:#3a1f24; }
.btn-danger:hover{ background:#241318; }

/* ---------- Hero ---------- */
.hero{ padding:96px 0 84px; }
.hero .container{ display:grid; grid-template-columns:1.05fr 1fr; gap:56px; align-items:center; }
.hero-photo-wrap{ position:relative; border-radius:20px; overflow:hidden; border:1px solid var(--line); background:var(--bg-panel); aspect-ratio:4/5; }
.hero-photo-wrap img{ width:100%; height:100%; object-fit:cover; }
.hero-photo-wrap .code-veil{
  position:absolute; inset:0; background:linear-gradient(180deg, rgba(7,11,20,.05), rgba(7,11,20,.85) 92%);
}
.hero-code{
  position:absolute; top:14px; left:16px; font-family:var(--font-mono); font-size:11.5px; color:var(--accent);
  opacity:.55; line-height:1.7; white-space:pre;
}
.hero h1{ font-size:clamp(30px,4vw,44px); line-height:1.15; margin-bottom:18px; }
.hero h1 .name{ color:var(--accent); }
.hero .lead{ font-size:17px; color:var(--text-mid); max-width:52ch; }
.pill-row{ display:flex; flex-wrap:wrap; gap:10px; margin-top:28px; }
.pill{
  display:flex; align-items:center; gap:9px; padding:10px 16px; border-radius:10px;
  background:var(--bg-panel); border:1px solid var(--line); font-size:13.5px; color:var(--text-mid);
}
.pill svg{ width:16px; height:16px; color:var(--accent); flex-shrink:0; }
.hero-cta{ display:flex; gap:12px; margin-top:32px; flex-wrap:wrap; }

/* ---------- Page header (non-home pages) ---------- */
.page-head{ padding:64px 0 40px; }
.page-head h1{ font-size:clamp(28px,3.6vw,38px); }
.page-head .lead{ max-width:60ch; color:var(--text-mid); }

/* ---------- Sections ---------- */
section{ padding:20px 0 84px; }
.section-title{ display:flex; align-items:baseline; justify-content:space-between; margin-bottom:28px; gap:16px; flex-wrap:wrap; }

/* ---------- CV page ---------- */
.cv-grid{ display:grid; grid-template-columns:1fr 1fr; gap:24px; }
.cv-card{ background:var(--bg-panel); border:1px solid var(--line); border-radius:var(--radius); padding:30px 30px 26px; }
.cv-card h3{ font-size:13px; font-family:var(--font-mono); letter-spacing:.1em; text-transform:uppercase; color:var(--accent); margin-bottom:22px; }
.cv-card h4{ font-size:15px; margin:20px 0 8px; color:var(--text-hi); }
.cv-card h4:first-of-type{ margin-top:0; }
.cv-card ul{ margin:0; padding-left:18px; color:var(--text-mid); font-size:14.5px; }
.cv-card li{ margin-bottom:7px; }
.cv-card p{ font-size:14.5px; margin-bottom:0; }
.cv-download{ text-align:center; margin-top:40px; }
@media (max-width:820px){ .cv-grid{ grid-template-columns:1fr; } }

/* ---------- Project cards ---------- */
.card-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
@media (max-width:980px){ .card-grid{ grid-template-columns:repeat(2,1fr);} }
@media (max-width:620px){ .card-grid{ grid-template-columns:1fr;} }

.proj-card{
  background:var(--bg-panel); border:1px solid var(--line); border-radius:var(--radius);
  overflow:hidden; cursor:pointer; transition:border-color .15s, transform .15s;
  display:flex; flex-direction:column;
}
.proj-card:hover{ border-color:var(--accent); transform:translateY(-3px); }
.proj-thumb{
  height:140px; display:flex; align-items:center; justify-content:center; font-size:44px;
  background:linear-gradient(135deg, var(--bg-panel-2), var(--bg-panel));
  border-bottom:1px solid var(--line);
}
.proj-body{ padding:20px; flex:1; display:flex; flex-direction:column; }
.proj-body h3{ font-size:17px; margin-bottom:8px; }
.proj-body p{ font-size:14px; color:var(--text-low); flex:1; margin-bottom:14px; }
.tech-row{ display:flex; gap:8px; flex-wrap:wrap; }
.tech-chip{ font-family:var(--font-mono); font-size:11px; padding:4px 9px; border-radius:6px; background:var(--bg-panel-2); border:1px solid var(--line); color:var(--text-mid); }

/* modal */
.modal-overlay{
  position:fixed; inset:0; background:rgba(4,6,12,.72); backdrop-filter:blur(4px);
  display:none; align-items:center; justify-content:center; z-index:100; padding:20px;
}
.modal-overlay.open{ display:flex; }
.modal{
  background:var(--bg-panel); border:1px solid var(--line); border-radius:18px;
  max-width:560px; width:100%; padding:32px; max-height:86vh; overflow:auto; position:relative;
}
.modal-close{ position:absolute; top:18px; right:18px; background:var(--bg-panel-2); border:1px solid var(--line); color:var(--text-mid); width:32px; height:32px; border-radius:8px; cursor:pointer; }
.modal .thumb-big{ font-size:52px; margin-bottom:18px; }
.modal h2{ font-size:22px; }
.modal-meta{ margin:18px 0; font-size:14px; }
.modal-meta strong{ color:var(--text-hi); font-weight:600; }
.modal-meta div{ margin-bottom:8px; }

/* ---------- Certificates ---------- */
.cert-list{ display:flex; flex-direction:column; gap:16px; }
.cert-row{
  display:grid; grid-template-columns:72px 1fr auto; gap:20px; align-items:center;
  background:var(--bg-panel); border:1px solid var(--line); border-radius:var(--radius); padding:20px 24px;
}
.cert-logo{ width:72px; height:72px; border-radius:12px; background:var(--bg-panel-2); display:flex; align-items:center; justify-content:center; font-size:28px; border:1px solid var(--line); }
.cert-row h3{ font-size:16.5px; margin-bottom:6px; }
.cert-row p{ font-size:13.5px; color:var(--text-low); margin-bottom:8px; }
.cert-meta{ display:flex; gap:18px; font-size:12.5px; color:var(--text-mid); flex-wrap:wrap; }
.cert-meta b{ color:var(--text-hi); font-weight:600; }
@media (max-width:640px){ .cert-row{ grid-template-columns:56px 1fr; } .cert-row .btn{ grid-column:1/-1; justify-self:start; } .cert-logo{ width:56px; height:56px; } }

/* ---------- Links page ---------- */
.link-list{ display:flex; flex-direction:column; gap:14px; max-width:640px; }
.link-row{
  display:flex; align-items:center; gap:16px; background:var(--bg-panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:18px 22px; transition:border-color .15s, transform .15s;
}
.link-row:hover{ border-color:var(--accent); transform:translateX(4px); }
.link-icon{ width:44px; height:44px; border-radius:10px; display:flex; align-items:center; justify-content:center; font-size:20px; background:var(--bg-panel-2); flex-shrink:0; }
.link-row h3{ font-size:15.5px; margin-bottom:2px; }
.link-row span{ font-size:13px; color:var(--text-low); font-family:var(--font-mono); }
.link-row svg.arrow{ margin-left:auto; width:18px; height:18px; color:var(--text-low); }

/* ---------- Footer ---------- */
footer{ border-top:1px solid var(--line); padding:34px 0; }
footer .container{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
footer p{ margin:0; font-size:13px; color:var(--text-low); font-family:var(--font-mono); }

/* ---------- Admin ---------- */
.admin-shell{ display:grid; grid-template-columns:220px 1fr; gap:0; min-height:calc(100vh - 68px); position:relative; z-index:1; }
.admin-side{ border-right:1px solid var(--line); padding:28px 18px; }
.admin-side button{
  display:block; width:100%; text-align:left; padding:10px 14px; margin-bottom:4px; border-radius:8px;
  background:none; border:none; color:var(--text-mid); font-size:14px; cursor:pointer; font-family:var(--font-body);
}
.admin-side button.active{ background:rgba(79,140,255,.12); color:var(--accent); font-weight:600; }
.admin-main{ padding:34px 40px; max-width:900px; }
.field{ margin-bottom:18px; }
.field label{ display:block; font-size:13px; color:var(--text-low); margin-bottom:7px; font-family:var(--font-mono); }
.field input, .field textarea{
  width:100%; background:var(--bg-panel); border:1px solid var(--line); border-radius:9px;
  padding:11px 13px; color:var(--text-hi); font-family:var(--font-body); font-size:14.5px; resize:vertical;
}
.field input:focus, .field textarea:focus{ outline:none; border-color:var(--accent); }
.two-col{ display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.admin-item{ background:var(--bg-panel); border:1px solid var(--line); border-radius:12px; padding:20px; margin-bottom:16px; }
.admin-item-head{ display:flex; justify-content:space-between; align-items:center; margin-bottom:14px; }
.admin-item-head h4{ margin:0; font-size:15px; }
.toast{
  position:fixed; bottom:26px; right:26px; background:var(--ok); color:#04231a; font-weight:600;
  padding:13px 20px; border-radius:10px; font-size:14px; transform:translateY(120%); transition:transform .25s; z-index:200;
}
.toast.show{ transform:translateY(0); }
.admin-lock{ max-width:380px; margin:110px auto; text-align:center; }
.admin-lock .field{ text-align:left; }
.admin-bar{ display:flex; gap:10px; margin-top:26px; flex-wrap:wrap; }
.hint{ font-size:12.5px; color:var(--text-low); margin-top:-8px; margin-bottom:18px; }

@media (max-width:820px){
  .admin-shell{ grid-template-columns:1fr; }
  .admin-side{ border-right:none; border-bottom:1px solid var(--line); display:flex; overflow-x:auto; gap:4px; padding:14px 18px; }
  .admin-side button{ white-space:nowrap; margin-bottom:0; }
  .admin-main{ padding:26px 20px; }
  .two-col{ grid-template-columns:1fr; }
  .hero .container{ grid-template-columns:1fr; }
  .hero-photo-wrap{ max-width:340px; margin:0 auto; }
}