*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f0f4f9;--white:#fff;--border:#e1e8f0;
  --blue:#2563eb;--blue-d:#1d4ed8;--blue-l:#dbeafe;--blue-xl:#eff6ff;
  --text:#1e293b;--text-mid:#475569;--text-light:#94a3b8;
  --shadow:0 2px 20px rgba(0,0,0,0.08);--r:14px;
}
body{background:var(--bg);font-family:'Quicksand',sans-serif;color:var(--text);min-height:100vh}

/* HEADER */
.page-hd{background:var(--white);border-bottom:1px solid var(--border);padding:1rem 2rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.hd-title h1{font-size:1.1rem;font-weight:700;letter-spacing:-0.01em}
.hd-title p{font-size:0.73rem;color:var(--text-light);margin-top:2px}
.hd-badges{display:flex;gap:0.5rem;flex-wrap:wrap}
.hbadge{font-family:'Fira Code',monospace;font-size:0.6rem;font-weight:600;letter-spacing:0.07em;padding:0.28rem 0.75rem;border-radius:6px}
.hb-blue{background:#eff6ff;border:1px solid #bfdbfe;color:var(--blue)}
.hb-green{background:#ecfdf5;border:1px solid #a7f3d0;color:#059669}

/* MAIN */
.main{max-width:1200px;margin:1.5rem auto;padding:0 1.5rem}

/* SEARCH */
.search-wrap{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:1.5rem;margin-bottom:1.5rem}
.search-input{width:100%;border:2px solid var(--border);border-radius:10px;padding:0.85rem 1.2rem 0.85rem 3rem;font-family:'Quicksand',sans-serif;font-size:0.95rem;font-weight:600;color:var(--text);background:#fafbfd url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="%2394a3b8" stroke-width="2"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.35-4.35"/></svg>') no-repeat 1rem center;outline:none;transition:all 0.2s}
.search-input:focus{border-color:var(--blue);background-color:var(--white)}
.search-hint{font-size:0.72rem;color:var(--text-light);margin-top:0.6rem;font-weight:500}

/* ALPHABET NAV */
.alphabet-nav{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:1rem 1.5rem;margin-bottom:1.5rem;display:flex;flex-wrap:wrap;gap:0.5rem;justify-content:center;align-items:center}
.letter-btn{font-family:'Fira Code',monospace;font-size:0.82rem;font-weight:700;width:36px;height:36px;border-radius:8px;border:1.5px solid var(--border);background:var(--white);color:var(--text-mid);cursor:pointer;transition:all 0.15s;display:flex;align-items:center;justify-content:center;letter-spacing:0.02em}
.letter-btn:hover{border-color:var(--blue);color:var(--blue);transform:translateY(-1px)}
.letter-btn.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.letter-btn.disabled{opacity:0.3;cursor:not-allowed;pointer-events:none}
.letter-btn.all-btn{width:auto;padding:0 0.9rem;background:var(--blue-xl);border-color:var(--blue-l);color:var(--blue)}
.letter-btn.all-btn.active{background:var(--blue);color:#fff}

/* RESULTS */
.results-wrap{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden}
.results-hd{padding:1rem 1.5rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.75rem}
.results-title{font-size:0.85rem;font-weight:700;color:var(--text)}
.results-count{font-family:'Fira Code',monospace;font-size:0.65rem;color:var(--text-light);font-weight:600}

/* TABLE */
.glossary-table{width:100%;border-collapse:collapse}
.glossary-table thead th{font-family:'Fira Code',monospace;font-size:0.62rem;font-weight:700;letter-spacing:0.1em;color:var(--text-light);padding:0.75rem 1.5rem;text-align:left;background:#fafbfd;border-bottom:2px solid var(--border);position:sticky;top:0;z-index:10}
.glossary-table tbody td{padding:1rem 1.5rem;border-bottom:1px solid #f1f5f9;vertical-align:top}
.glossary-table tbody tr:last-child td{border-bottom:none}
.glossary-table tbody tr{transition:background 0.12s}
.glossary-table tbody tr:hover{background:#fafbfd}
.term-col{width:28%;font-size:0.88rem;font-weight:700;color:var(--text)}
.meaning-col{font-size:0.82rem;color:var(--text-mid);line-height:1.5}
.term-highlight{background:linear-gradient(120deg,#fef3c7 0%,#fef3c7 100%);background-size:100% 40%;background-position:0 85%;background-repeat:no-repeat;padding:0 2px}

/* EMPTY STATE */
.empty-state{text-align:center;padding:4rem 2rem;color:var(--text-light)}
.empty-icon{font-size:3rem;margin-bottom:1rem;opacity:0.5}
.empty-text{font-size:0.92rem;font-weight:600;color:var(--text-mid)}
.empty-sub{font-size:0.78rem;color:var(--text-light);margin-top:0.5rem}

/* FOOTER */
.page-ft{background:var(--white);border-top:1px solid var(--border);text-align:center;padding:1.25rem;font-size:0.72rem;color:var(--text-light);margin-top:1.5rem}

/* RESPONSIVE */
@media(max-width:768px){
  .term-col{width:35%}
  .alphabet-nav{gap:0.35rem}
  .letter-btn{width:32px;height:32px;font-size:0.75rem}
  .glossary-table thead th{padding:0.6rem 1rem;font-size:0.58rem}
  .glossary-table tbody td{padding:0.85rem 1rem}
}
@media(max-width:480px){
  .term-col{display:block;width:100%;padding-bottom:0.4rem;border-bottom:none}
  .meaning-col{display:block;width:100%;padding-top:0}
  .glossary-table tbody td{display:block;width:100%!important;border-bottom:1px solid #f1f5f9}
  .glossary-table tbody tr{border-bottom:1px solid var(--border)}
}