:root {
    --bg: #0a1612;
    --green: #4ade80;
    --text: #e8f5e9;
    --muted: #7fb89a;
    --card-bg: rgba(255,255,255,0.03);
    --border: rgba(255,255,255,0.07);
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
  }

  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
    opacity: .5;
  }

  /* ── NAV ── */
  nav {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    background: rgba(10,22,18,0.8);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 10px 28px;
    display: flex;
    gap: 32px;
    animation: fadeDown .6s ease both;
  }
  nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color .2s;
  }
  nav a:hover, nav a.active { color: var(--text); }

  /* ── WRAPPER ── */
  .wrapper {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 120px 24px 80px;
  }

  /* ── BREADCRUMB ── */
  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 40px;
    animation: fadeUp .5s ease both;
  }
  .breadcrumb a {
    color: var(--muted);
    text-decoration: none;
    transition: color .2s;
  }
  .breadcrumb a:hover { color: var(--green); }
  .breadcrumb-sep { opacity: .4; }
  .breadcrumb-current { color: var(--text); font-weight: 500; }

  /* ── HEADING BLOCK ── */
  .page-heading {
    margin-bottom: 60px;
    animation: fadeUp .6s .1s ease both;
    opacity: 0;
    animation-fill-mode: forwards;
  }
  .page-tag {
    font-size: 12px;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--green);
    margin-bottom: 12px;
  }
  .page-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(36px, 6vw, 72px);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -.02em;
    margin-bottom: 16px;
  }
  .page-title em { font-style: italic; color: var(--green); }
  .page-subtitle {
    color: var(--muted);
    font-size: 16px;
    line-height: 1.7;
    max-width: 500px;
  }

  /* ── STATS ROW ── */
  .stats-row {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
    margin-bottom: 56px;
    padding: 24px 32px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    animation: fadeUp .6s .2s ease both;
    opacity: 0;
    animation-fill-mode: forwards;
  }
  .stat-item { display: flex; flex-direction: column; gap: 4px; }
  .stat-num {
    font-family: 'Playfair Display', serif;
    font-size: 32px;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
  }
  .stat-num span { color: var(--green); }
  .stat-label { font-size: 12px; color: var(--muted); letter-spacing: .06em; }
  .stat-divider { width: 1px; background: var(--border); align-self: stretch; }

  /* ── SEARCH + FILTER BAR ── */
  .controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 40px;
    animation: fadeUp .6s .3s ease both;
    opacity: 0;
    animation-fill-mode: forwards;
  }

  .search-wrap {
    position: relative;
    flex: 1;
    min-width: 220px;
  }
  .search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
    font-size: 15px;
    pointer-events: none;
  }
  .search-input {
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 12px 20px 12px 44px;
    font-size: 14px;
    font-family: 'DM Sans', sans-serif;
    color: var(--text);
    outline: none;
    transition: border-color .2s, box-shadow .2s;
  }
  .search-input::placeholder { color: var(--muted); }
  .search-input:focus {
    border-color: rgba(74,222,128,0.35);
    box-shadow: 0 0 0 3px rgba(74,222,128,0.07);
  }

  .filter-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
  }
  .chip {
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--muted);
    transition: all .2s;
    white-space: nowrap;
    user-select: none;
  }
  .chip:hover { border-color: rgba(74,222,128,0.3); color: var(--text); }
  .chip.active {
    background: rgba(74,222,128,0.12);
    border-color: rgba(74,222,128,0.4);
    color: var(--green);
  }

  /* ── RESULTS COUNT ── */
  .results-count {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 24px;
    animation: fadeUp .5s .35s ease both;
    opacity: 0;
    animation-fill-mode: forwards;
  }
  .results-count strong { color: var(--text); }

  /* ── CASE STUDY LIST ── */
  .works-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .case-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    overflow: hidden;
    transition: transform .3s, box-shadow .3s, border-color .3s;
    min-height: 260px;
    animation: fadeUp .5s ease both;
    opacity: 0;
    animation-fill-mode: forwards;
  }
  .case-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 60px rgba(0,0,0,0.5);
    border-color: rgba(74,222,128,0.2);
  }
  .case-card.hidden { display: none; }

  @media (max-width: 660px) {
    .case-card { grid-template-columns: 1fr; }
    .case-visual { min-height: 200px; }
    .page-title { font-size: 36px; }
    .stats-row { gap: 20px; padding: 18px 20px; }
    nav { gap: 16px; padding: 10px 18px; }
  }

  .case-info {
    padding: 32px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 12px;
  }
  .case-meta {
    font-size: 11px;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--green);
    font-weight: 500;
  }
  .case-category-tag {
    display: inline-block;
    font-size: 10px;
    letter-spacing: .1em;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 999px;
    border: 1px solid rgba(74,222,128,0.2);
    color: var(--muted);
    margin-left: 8px;
  }
  .case-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(18px, 2.2vw, 24px);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text);
  }
  .case-desc {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.7;
  }
  .case-stats {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 5px;
  }
  .case-stats li {
    font-size: 13px;
    color: var(--muted);
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .check {
    color: var(--green);
    font-size: 10px;
    width: 16px; height: 16px;
    border: 1px solid rgba(74,222,128,0.35);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .case-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: 999px;
    font-size: 13px;
    color: var(--text);
    text-decoration: none;
    width: fit-content;
    transition: background .2s, border-color .2s, transform .2s;
    margin-top: 4px;
  }
  .case-btn:hover {
    background: rgba(255,255,255,0.07);
    border-color: rgba(255,255,255,0.35);
    transform: translateX(3px);
  }

  /* visual side */
  .case-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px;
    position: relative;
    overflow: hidden;
  }
  .case-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 60% 40%, rgba(74,222,128,0.06) 0%, transparent 65%);
  }
  .case-mockup-img {
    width: 100%;
    max-width: 280px;
    max-height: 240px;
    object-fit: contain;
    border-radius: 14px;
    position: relative;
    z-index: 1;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  }

  /* phone mockup */
  .mockup-phone {
    width: 130px;
    background: #111;
    border-radius: 22px;
    padding: 8px 5px;
    border: 2px solid rgba(255,255,255,0.1);
    box-shadow: 0 20px 50px rgba(0,0,0,0.6);
    position: relative; z-index: 1;
  }
  .mockup-phone::before {
    content: '';
    display: block;
    width: 36px; height: 5px;
    background: rgba(255,255,255,0.12);
    border-radius: 3px;
    margin: 0 auto 7px;
  }
  .phone-screen { border-radius: 14px; overflow: hidden; min-height: 180px; }

  /* browser mockup */
  .mockup-browser {
    width: 100%;
    max-width: 270px;
    background: #1a1a1a;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 20px 50px rgba(0,0,0,0.6);
    position: relative; z-index: 1;
  }
  .browser-bar {
    background: #2a2a2a;
    padding: 7px 10px;
    display: flex;
    align-items: center;
    gap: 5px;
  }
  .b-dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
  .b-url {
    margin-left: 8px;
    font-size: 8px;
    color: #888;
    background: rgba(255,255,255,0.07);
    padding: 2px 10px;
    border-radius: 4px;
    flex: 1;
  }
  .browser-body { min-height: 130px; }

  /* ── NO RESULTS ── */
  .no-results {
    display: none;
    text-align: center;
    padding: 80px 20px;
    color: var(--muted);
  }
  .no-results.show { display: block; }
  .no-results-icon { font-size: 48px; margin-bottom: 16px; }
  .no-results h3 { font-family: 'Playfair Display', serif; font-size: 24px; color: var(--text); margin-bottom: 8px; }

  /* ── BACK TO TOP ── */
  .back-to-home {
    display: flex;
    justify-content: center;
    margin-top: 60px;
  }
  .back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    transition: color .2s, border-color .2s;
  }
  .back-btn:hover { color: var(--text); border-color: rgba(255,255,255,0.2); }

  /* ── KEYFRAMES ── */
  @keyframes fadeDown { from { opacity:0; transform:translateX(-50%) translateY(-20px); } to { opacity:1; transform:translateX(-50%) translateY(0); } }
  @keyframes fadeUp { from { opacity:0; transform:translateY(28px); } to { opacity:1; transform:translateY(0); } }

  /* Fun ZOne */
.game-btn{
  position:fixed;
  left:30px;
  bottom:30px;

  display:flex;
  align-items:center;
  justify-content:center;
  width:60px;
  height:60px;

  background:linear-gradient(135deg,#1a3a2a,#2a5a3a);
  color:white;
  border-radius:16px;
  box-shadow:0 2px 5px rgba(24,190,2,0.4);
  transition:all .3s ease;
  z-index:9999;
}

/* ICON */
.btn-icon{
  font-size:26px;
}

/* 🔥 Tooltip */
.game-btn::after{
  content:"Fun Zone";
  position:absolute;
  bottom:70px;          /* button এর ডান পাশে */
  background:#1a3a2a;
  color:#fff;
  padding:8px 14px;
  border-radius:999px;
  font-size:14px;
  white-space:nowrap;

  opacity:0;
  transform:translateX(-5px);
  transition:all .25s ease;
  pointer-events:none;
}

/* Hover */
.game-btn:hover::after{
  opacity:1;
  transform:translateX(0);
}