@import url('https://fonts.googleapis.com/css2?family=Syne:wght@700;800&family=Inter:wght@400;500;600&display=swap');

:root {
  --purple:        #a855f7;
  --purple-deep:   #7c3aed;
  --purple-light:  #c084fc;
  --purple-glow:   rgba(168,85,247,0.25);
  --purple-dim:    rgba(168,85,247,0.10);
  --purple-border: rgba(168,85,247,0.28);
  --indigo:        #6C63FF;
  --bg:            #060610;
  --bg-card:       #111122;
  --bg-card2:      #16152a;
  --border:        rgba(255,255,255,0.06);
  --text:          #f0eeff;
  --text-muted:    #8b87aa;
  --text-dim:      #4a4769;
  --radius:        14px;
  --transition:    0.35s cubic-bezier(0.4,0,0.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.65; overflow-x: hidden; min-height: 100vh;
  padding-bottom: 3rem;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--purple); border-radius: 3px; }

@media (min-width: 769px) {
  body::before {
    content: '';
    position: fixed; top: -200px; right: -200px;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(124,58,237,0.10) 0%, transparent 65%);
    pointer-events: none; z-index: 0;
  }
}

/* ============================================================
   PAGE HEADER
   ============================================================ */
.page-header {
  padding: 4rem 1.5rem 1.5rem;
  text-align: center; position: relative; z-index: 1;
}
.page-header h2 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  font-weight: 800; letter-spacing: -1px;
  background: linear-gradient(135deg, var(--purple), var(--indigo));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 0.4rem;
}
.page-header p { font-size: 0.88rem; color: var(--text-muted); }

/* ============================================================
   BACK BUTTON
   ============================================================ */
.back-btn {
  position: fixed; top: 16px; right: 16px;
  padding: 0.55rem 1.1rem; font-size: 0.82rem; font-weight: 600;
  font-family: 'Inter', sans-serif;
  background: var(--purple-dim); color: var(--purple);
  border: 1px solid var(--purple-border); border-radius: 10px;
  cursor: pointer; transition: all var(--transition); z-index: 9999;
  backdrop-filter: blur(10px); white-space: nowrap;
}
.back-btn:hover { background: var(--purple); color: white; transform: translateY(-2px); }

/* ============================================================
   TAB BUTTONS
   ============================================================ */
.tab-buttons {
  display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap;
  padding: 0 1.5rem 1.8rem; position: relative; z-index: 1;
}

.tab-btn {
  padding: 0.5rem 1.2rem; font-size: 0.83rem; font-weight: 600;
  font-family: 'Inter', sans-serif;
  background: var(--bg-card); color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; transition: all var(--transition);
}
.tab-btn.active, .tab-btn:hover {
  background: linear-gradient(135deg, var(--purple), var(--indigo));
  color: white; border-color: transparent;
  box-shadow: 0 4px 14px var(--purple-glow);
}

.hidden { display: none !important; }

/* ============================================================
   CONTENT WRAPPER
   ============================================================ */
.page-content {
  max-width: 1200px; margin: 0 auto;
  padding: 0 1.5rem 1rem;
  position: relative; z-index: 1;
}

/* ============================================================
   GRIDS
   ============================================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

.section-content { display: none; }
.section-content.active { display: grid; grid-template-columns: repeat(auto-fit, minmax(310px,1fr)); gap: 14px; }

/* ============================================================
   CARDS — shared
   ============================================================ */
.exp-card, .proj-card {
  background: var(--bg-card); border: 1px solid var(--purple-border);
  border-radius: var(--radius); padding: 1.6rem 1.4rem;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.exp-card::before, .proj-card::before {
  content: ''; position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px; background: linear-gradient(180deg, var(--purple), var(--indigo));
  transform: scaleY(0); transform-origin: top; transition: transform var(--transition);
}
.exp-card:hover::before, .proj-card:hover::before { transform: scaleY(1); }
.exp-card:hover, .proj-card:hover {
  background: var(--bg-card2); transform: translateY(-4px);
  box-shadow: 0 10px 36px var(--purple-glow); border-color: var(--purple);
}

.card-meta { font-size: 0.7rem; font-weight: 700; color: var(--purple); text-transform: uppercase; letter-spacing: 1.2px; margin-bottom: 0.45rem; }
.card-title { font-family: 'Syne', sans-serif; font-size: 1rem; font-weight: 800; color: var(--text); margin-bottom: 0.4rem; line-height: 1.3; }
.card-sub { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.9rem; }

.card-points { display: flex; flex-direction: column; gap: 0.45rem; }
.card-points li {
  font-size: 0.82rem; color: var(--text-muted); line-height: 1.6;
  padding: 0.55rem 0.85rem; background: var(--bg-card2);
  border-radius: 7px; border-left: 2px solid var(--purple-border);
  transition: all var(--transition);
  display: flex; align-items: flex-start; gap: 0.5rem;
}
.card-points li::before { content: '›'; color: var(--purple); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.card-points li:hover { border-left-color: var(--purple); background: var(--purple-dim); color: var(--text); }

.card-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.8rem; font-weight: 600; color: var(--purple);
  margin-bottom: 0.7rem; transition: all var(--transition);
}
.card-link:hover { color: var(--purple-light); gap: 0.65rem; }

.tag-stack { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.8rem; }
.tag {
  font-size: 0.68rem; font-weight: 600; color: var(--purple);
  background: var(--purple-dim); border: 1px solid var(--purple-border);
  padding: 0.18rem 0.6rem; border-radius: 20px; letter-spacing: 0.3px;
}

/* ============================================================
   CERT + BADGE CARDS
   ============================================================ */
.cert-container, .badges-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  padding: 0 1.5rem 1rem;
  max-width: 1200px; margin: 0 auto;
  position: relative; z-index: 1;
}

.cert-card, .badge-card {
  background: var(--bg-card);
  padding: 1.8rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--purple-border);
  transition: all var(--transition);
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 0.7rem;
}
.cert-card:hover, .badge-card:hover {
  transform: translateY(-6px); border-color: var(--purple);
  box-shadow: 0 12px 36px var(--purple-glow); background: var(--bg-card2);
}
.cert-card img, .badge-card img {
  width: 100%; height: 100px; object-fit: contain;
  filter: brightness(0.95);
}
.cert-card h3, .badge-card h3 {
  font-family: 'Syne', sans-serif; font-size: 0.92rem; font-weight: 700;
  color: var(--text);
}
.view-link {
  font-size: 0.8rem; font-weight: 600; color: var(--purple);
  transition: all var(--transition); margin-top: auto; padding-top: 0.3rem;
}
.view-link:hover { color: var(--purple-light); text-decoration: underline; }

/* Filter buttons for certificates */
.filter-buttons {
  display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap;
  padding: 0 1.5rem 1.4rem; position: relative; z-index: 1;
}

/* ============================================================
   SKILL CARDS
   ============================================================ */
#main-content { padding-top: 80px; position: relative; z-index: 1; }
.section-title {
  font-family: 'Syne', sans-serif; font-size: 1rem; font-weight: 800;
  margin: 1.8rem 1rem 0.8rem; color: var(--purple);
  text-transform: uppercase; letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(168,85,247,0.4);
  text-align: center;
}
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px; padding: 0 1rem;
}
.skill-card {
  background: rgba(30,30,50,0.9); padding: 1.4rem 1rem;
  border-radius: 12px; border: 1px solid var(--purple-border);
  text-align: center; transition: all var(--transition);
}
.skill-card i { font-size: 28px; color: var(--purple); display: block; margin-bottom: 0.6rem; }
.skill-card h3 { font-size: 0.82rem; color: var(--text); font-weight: 600; }
.skill-card:hover { transform: translateY(-4px) scale(1.04); box-shadow: 0 0 18px var(--purple-glow); border-color: var(--purple); }

.tech-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
  gap: 12px; padding: 0 1rem 1rem;
}
.tech-card {
  background: var(--bg-card); border-radius: 14px; padding: 1.4rem;
  text-align: center; transition: all var(--transition); border: 1px solid var(--border);
}
.tech-card i { font-size: 28px; color: var(--purple); margin-bottom: 0.7rem; }
.tech-card h3 { font-size: 0.92rem; margin-bottom: 0.4rem; color: var(--text); font-weight: 700; }
.tech-card p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }
.tech-card:hover { transform: translateY(-5px); box-shadow: 0 0 20px rgba(155,92,255,0.28); border-color: var(--purple-border); }

nav.skill-nav {
  position: fixed; top: 0; left: 0; right: 0;
  background: rgba(6,6,16,0.9); backdrop-filter: blur(16px);
  display: flex; justify-content: center; align-items: center;
  padding: 1rem 1.5rem; z-index: 1000;
  border-bottom: 1px solid var(--purple-border);
}
nav.skill-nav .logo {
  font-family: 'Syne', sans-serif; color: var(--purple); font-size: 1.1rem; font-weight: 800;
}

/* ============================================================
   RESPONSIVE — TABLET  (max 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .section-content.active { grid-template-columns: repeat(2,1fr); }
  .cert-container, .badges-container { grid-template-columns: repeat(3, 1fr); }
  .skills-container { grid-template-columns: repeat(auto-fit, minmax(120px,1fr)); }
}

/* ============================================================
   RESPONSIVE — MOBILE  (max 768px)
   ============================================================ */
@media (max-width: 768px) {
  .page-header { padding: 4.5rem 1rem 1.2rem; }
  .page-header h2 { font-size: 1.7rem; }

  .back-btn { top: 12px; right: 12px; padding: 0.45rem 0.9rem; font-size: 0.78rem; }

  .page-content { padding: 0 1rem 1rem; }

  .cards-grid { grid-template-columns: 1fr; }
  .section-content.active { grid-template-columns: 1fr; }

  .cert-container, .badges-container { grid-template-columns: repeat(2, 1fr); padding: 0 1rem 1rem; }

  .skills-container { grid-template-columns: repeat(3, 1fr); padding: 0 0.8rem; gap: 8px; }
  .skill-card { padding: 1.1rem 0.7rem; }
  .skill-card i { font-size: 22px; }
  .skill-card h3 { font-size: 0.75rem; }

  .tech-grid { grid-template-columns: repeat(2,1fr); padding: 0 0.8rem 0.8rem; gap: 10px; }
  .tech-card { padding: 1.1rem; }

  .section-title { font-size: 0.85rem; margin: 1.4rem 0.8rem 0.6rem; }

  .exp-card, .proj-card { padding: 1.2rem 1.1rem; }
  .card-title { font-size: 0.93rem; }

  .tab-buttons { padding: 0 1rem 1.4rem; gap: 0.4rem; }
  .tab-btn { padding: 0.45rem 0.9rem; font-size: 0.8rem; }

  .filter-buttons { padding: 0 1rem 1.2rem; gap: 0.4rem; }

  #main-content { padding-top: 70px; }
}

/* ============================================================
   RESPONSIVE — SMALL MOBILE  (max 480px)
   ============================================================ */
@media (max-width: 480px) {
  .page-header { padding: 4rem 0.8rem 1rem; }

  .cert-container, .badges-container { grid-template-columns: 1fr; }

  .skills-container { grid-template-columns: repeat(2, 1fr); }

  .tech-grid { grid-template-columns: 1fr; }

  .exp-card, .proj-card { padding: 1.1rem 1rem; }
  .card-points li { font-size: 0.79rem; padding: 0.5rem 0.7rem; }

  .tag { font-size: 0.64rem; padding: 0.15rem 0.5rem; }

  .tab-btn { padding: 0.4rem 0.8rem; font-size: 0.78rem; }

  .section-title { font-size: 0.8rem; letter-spacing: 1.5px; }
}