/* -------- Design tokens -------- */
:root{
  --bg: #f6f8fc;
  --surface: #ffffff;
  --text: #141824;
  --muted:#64748b;
  --border: #e2e8f0;
  --primary:#2563eb;
  --primary-dim: rgba(37, 99, 235, 0.08);
  --accent:#3b82f6;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 4px 16px rgba(0,0,0,0.04);
  --shadow-lg:0 12px 40px rgba(0,0,0,0.06);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --spring: 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

body.dark, body.dark-amber{
  --bg: #0b0f17;
  --surface: rgba(18, 22, 34, 0.85);
  --text: #e8edf5;
  --muted: #8895aa;
  --border: rgba(255,255,255,0.06);
  --primary:#f59e0b;
  --primary-dim: rgba(245, 158, 11, 0.1);
  --accent:#fbbf24;
  --shadow:0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg:0 12px 40px rgba(0,0,0,0.4);
}

body.dark-purple{
  --bg: #0c0818;
  --surface: rgba(22, 16, 36, 0.85);
  --text: #ede9fe;
  --muted: #9b8ec4;
  --border: rgba(255,255,255,0.06);
  --primary:#8b5cf6;
  --primary-dim: rgba(139, 92, 246, 0.12);
  --accent:#a78bfa;
  --shadow:0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg:0 12px 40px rgba(0,0,0,0.45);
}

/* -------- Reset & base -------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,system-ui,sans-serif;
  color:var(--text);background:var(--bg);
  padding-bottom:90px;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--primary);color:#fff}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{opacity:0.85}
img{max-width:100%;height:auto}
.container{max-width:1000px;margin:0 auto;padding:24px}
@media(max-width:768px){.container{padding:16px}}

/* -------- Page fade-in (modal backdrop only) -------- */
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* -------- Page header (shared) -------- */
.page-header{margin-bottom:2rem}
.page-header h1{margin:0 0 0.5rem;font-size:2rem;letter-spacing:-0.5px}
.page-header p{color:var(--muted);margin:0;font-size:0.95rem}
@keyframes pulseGlow{0%,50%,100%{transform:scale(1);opacity:0.5}70%{transform:scale(1.1);opacity:1}}
.section-title{font-size:1.15rem;font-weight:700;margin:2.5rem 0 1.25rem;letter-spacing:-0.3px;color:var(--text)}
.section-title::after{content:"";display:block;width:32px;height:3px;background:var(--primary);border-radius:4px;margin-top:6px}

/* -------- Floating theme toggle -------- */
.theme-float{
  position:fixed;bottom:80px;right:20px;z-index:40;
  width:44px;height:44px;border-radius:50%;border:1px solid var(--border);
  background:rgba(255,255,255,0.85);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  color:var(--text);cursor:pointer;font-size:18px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 16px rgba(0,0,0,0.06);
  transition:var(--transition);
}
body.dark .theme-float, body.dark-amber .theme-float{background:rgba(18,22,34,0.85)}
body.dark-purple .theme-float{background:rgba(22,16,36,0.85)}
.theme-float:hover{transform:scale(1.12);box-shadow:0 6px 24px rgba(0,0,0,0.1)}

/* -------- Bottom Navigation -------- */
.bottom-nav{
  position:fixed;bottom:16px;left:50%;transform:translateX(-50%);
  z-index:30;display:flex;align-items:center;justify-content:space-around;
  max-width:600px;width:calc(100% - 32px);padding:6px 4px;
  background:rgba(255,255,255,0.45);backdrop-filter:blur(14px) saturate(1.3);
  -webkit-backdrop-filter:blur(14px) saturate(1.3);
  border:1px solid var(--border);border-radius:24px;
  box-shadow:0 8px 32px rgba(0,0,0,0.06),inset 0 1px 0 rgba(255,255,255,0.6);
}
body.dark .bottom-nav, body.dark-amber .bottom-nav{
  background:rgba(18,22,34,0.4);
  border-color:rgba(255,255,255,0.06);
  box-shadow:0 8px 32px rgba(0,0,0,0.3),inset 0 1px 0 rgba(255,255,255,0.04);
}
body.dark-purple .bottom-nav{
  background:rgba(22,16,36,0.4);
  border-color:rgba(255,255,255,0.06);
  box-shadow:0 8px 32px rgba(0,0,0,0.35),inset 0 1px 0 rgba(255,255,255,0.04);
}
.nav-item{
  position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:2px;padding:8px 14px;min-width:56px;
  color:var(--muted);text-decoration:none;transition:var(--transition);
  cursor:pointer;user-select:none;
}
.nav-item:hover{color:var(--text)}
.nav-item.active{color:var(--primary)}
.nav-icon{font-size:1.25rem;line-height:1;transition:var(--transition)}
.nav-label{font-size:0.6rem;font-weight:600;letter-spacing:0.4px;text-transform:uppercase}
.nav-item.active .nav-icon{transform:translateY(-3px) scale(1.1)}
.nav-item.active .nav-label{font-weight:700}
.nav-item.active::after{
  content:'';position:absolute;top:-3px;left:50%;transform:translateX(-50%);
  width:20px;height:3px;border-radius:4px;background:var(--primary);
}
.nav-slider{
  position:absolute;top:4px;bottom:4px;z-index:1;
  background:var(--primary);border-radius:20px;
  transition:left 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  opacity:0.1;
}
body.dark .nav-slider, body.dark-amber .nav-slider{opacity:0.18}
body.dark-purple .nav-slider{opacity:0.18}

/* -------- Buttons -------- */
.btn{
  display:inline-block;background:var(--primary);color:#fff;
  padding:0.55rem 1.25rem;border-radius:999px;text-decoration:none;
  font-weight:600;font-size:0.9rem;transition:var(--transition);
  border:none;cursor:pointer;
}
.btn:hover{opacity:0.9;transform:translateY(-2px);box-shadow:0 4px 16px rgba(37,99,235,0.2)}
.btn.secondary{background:var(--border);color:var(--text)}
.btn.secondary:hover{box-shadow:none}

/* -------- Cards (shared) -------- */
.card{
  padding:1.5rem;border-radius:var(--radius);border:1px solid var(--border);
  background:var(--surface);box-shadow:var(--shadow);
  transition:var(--transition);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.badge{
  display:inline-block;background:var(--primary);color:#fff;
  border-radius:6px;padding:3px 10px;font-size:0.7rem;font-weight:700;
  letter-spacing:0.3px;margin-bottom:0.75rem;
}

/* -------- Tech tags (shared) -------- */
.tech-tag{
  display:inline-block;padding:3px 10px;border-radius:6px;
  font-size:0.7rem;font-weight:600;letter-spacing:0.2px;
  background:var(--primary-dim);color:var(--primary);
  margin-right:6px;margin-top:6px;
}

/* -------- Skill tags (shared with skills page) -------- */
.skill-grid{display:flex;flex-wrap:wrap;gap:0.6rem;margin-bottom:2rem}
.skill-tag{
  display:inline-block;padding:0.5rem 1rem;border-radius:var(--radius-sm);
  background:var(--surface);border:1px solid var(--border);
  font-size:0.9rem;color:var(--text);transition:var(--transition);
}
.skill-tag:hover{border-color:var(--primary);transform:translateY(-2px)}

/* -------- Cert card & grid -------- */
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0.75rem}
@media(max-width:768px){.cert-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.cert-grid{grid-template-columns:1fr}}
.cert-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:12px;padding:1.1rem 1.25rem;
  transition:var(--transition);display:flex;flex-direction:column;
}
.cert-card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:var(--shadow)}
.cert-card h3{margin:0 0 0.2rem;font-size:0.9rem;flex:1}
.cert-card p{margin:0;color:var(--muted);font-size:0.8rem}
.cert-badge{
  display:inline-block;background:var(--primary);color:#fff;
  font-size:0.55rem;font-weight:700;padding:2px 8px;border-radius:4px;
  letter-spacing:0.5px;text-transform:uppercase;margin-bottom:0.5rem;align-self:flex-start;
}

/* -------- Project card (shared) -------- */
.app-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.5rem;margin-bottom:1rem;
  transition:var(--transition);
}
.app-card:hover{border-color:var(--primary);transform:translateY(-2px)}
.app-card h3{margin:0 0 0.5rem;font-size:1.05rem}
.app-card .tag{
  display:inline-block;background:var(--primary-dim);color:var(--primary);
  padding:2px 10px;border-radius:6px;font-size:0.7rem;font-weight:600;
  margin-bottom:0.5rem;
}
.app-card p{margin:0 0 1rem;color:var(--muted);font-size:0.9rem;line-height:1.6}
.app-card a{font-weight:600}

/* -------- Blog cards (shared) -------- */
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:1rem}
.blog-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.25rem;cursor:pointer;
  transition:var(--transition);
}
.blog-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.blog-card .card-date{font-size:0.7rem;color:var(--muted);margin-bottom:0.4rem;text-transform:uppercase;letter-spacing:0.5px}
.blog-card .card-title{margin:0 0 0.4rem;font-size:1rem;line-height:1.4}
.blog-card .card-desc{margin:0;color:var(--muted);font-size:0.85rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.blog-card .card-tags{margin-top:0.75rem;display:flex;flex-wrap:wrap;gap:0.4rem}
.blog-card .tag{font-size:0.6rem;background:var(--primary-dim);color:var(--primary);padding:2px 8px;border-radius:4px;font-weight:600}

/* -------- Contact cards (shared) -------- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.25rem;max-width:800px;margin:0 auto}
.contact-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.5rem;text-align:center;
  transition:var(--transition);
}
.contact-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.contact-icon{font-size:2rem;margin-bottom:0.75rem}
.contact-card h3{margin:0 0 0.25rem;font-size:1rem}
.contact-card p{margin:0;color:var(--muted)}
.contact-card a{font-weight:600}
.cta-box{
  max-width:600px;margin:3rem auto 0;text-align:center;
  padding:2rem;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);
}
.cta-box h2{margin:0 0 0.5rem;font-size:1.35rem}
.cta-box p{color:var(--muted);margin:0 0 1.5rem}

/* -------- Modal (shared with blog) -------- */
.modal{
  display:none;position:fixed;inset:0;z-index:100;
  align-items:flex-start;justify-content:center;padding:2rem 1rem;
  overscroll-behavior:contain;
}
.modal.active{display:flex}
.modal-backdrop{
  position:fixed;inset:0;
  background:rgba(0,0,0,0.5);backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);animation:fadeIn 0.2s ease;
}
.modal-content{
  position:relative;background:var(--surface);border:1px solid var(--border);
  border-radius:20px;max-width:720px;width:100%;
  max-height:80vh;overflow-y:auto;margin-top:1rem;
  box-shadow:0 25px 60px rgba(0,0,0,0.15);
  animation:modalIn 0.3s ease;
}
.modal-content::-webkit-scrollbar{width:6px}
.modal-content::-webkit-scrollbar-track{background:transparent}
.modal-content::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
@keyframes modalIn{from{opacity:0;transform:scale(0.97) translateY(12px)}to{opacity:1;transform:scale(1) translateY(0)}}
.modal-close{
  position:absolute;top:1rem;right:1rem;z-index:10;
  width:36px;height:36px;border-radius:50%;border:1px solid var(--border);
  background:var(--surface);color:var(--text);font-size:1.4rem;
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:var(--transition);
}
.modal-close:hover{background:var(--muted);color:#fff}
.modal-body{padding:2rem}
.modal-header{margin-bottom:1.5rem}
.modal-date{font-size:0.8rem;color:var(--muted);margin-bottom:0.5rem}
.modal-title{margin:0;font-size:1.4rem;line-height:1.3}
.modal-text{color:var(--text);line-height:1.7}
.modal-text h3{margin:1.5rem 0 0.5rem;font-size:1.05rem}
.modal-text p{margin:0 0 1rem}
.modal-text ul,.modal-text ol{margin:0 0 1rem;padding-left:1.5rem}
.modal-text li{margin-bottom:0.4rem}
.modal-text .badge{display:inline-block;background:var(--primary);color:#fff;font-size:0.65rem;padding:2px 8px;border-radius:4px;margin-bottom:0.5rem}

/* -------- Loading spinner -------- */
.spinner{display:none;width:28px;height:28px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 0.7s linear infinite;margin:2rem auto}
.spinner.active{display:block}
@keyframes spin{to{transform:rotate(360deg)}}

/* -------- Footer -------- */
.site-footer{
  max-width:1100px;margin:16px auto;padding:12px 16px 100px;
  text-align:center;color:var(--muted);font-size:0.7rem;
  letter-spacing:0.5px;text-transform:uppercase;
}

/* -------- Responsive -------- */
@media(max-width:768px){
  .grid{grid-template-columns:1fr}
  .bottom-nav{bottom:12px;border-radius:20px;padding:4px 2px}
  .nav-item{padding:6px 10px;min-width:48px}
  .nav-icon{font-size:1.15rem}
  .nav-label{font-size:0.55rem}
  .theme-float{bottom:74px;right:14px;width:38px;height:38px;font-size:15px}
  .site-footer{padding:12px 16px 90px}
  .blog-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .bottom-nav{width:calc(100% - 20px)}
  .nav-item{padding:4px 6px;min-width:40px}
}