/* ── Variables ── */
:root {
  --bg:         #0a0e1a;
  --surface:    #111827;
  --card:       #151e30;
  --border:     #1e3a5f;
  --accent:     #00d4ff;
  --accent2:    #7c3aed;
  --accent3:    #f59e0b;
  --text:       #e2e8f0;
  --text-muted: #94a3b8;
  --green:      #10b981;
  --red:        #ef4444;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

/* ── Stars background ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 10%, rgba(0,212,255,.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 60%, rgba(255,255,255,.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 40% 80%, rgba(124,58,237,.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 10% 70%, rgba(255,255,255,.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 40%, rgba(0,212,255,.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 50% 50%, rgba(255,255,255,.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 15%, rgba(124,58,237,.3) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* ═══════════════════════ HEADER ═══════════════════════ */
header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 56px 24px 40px;
}

.badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

header h1 {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 800;
  background: linear-gradient(135deg, #fff 30%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.15;
  margin-bottom: 16px;
}

header p {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

.stats {
  display: inline-flex;
  gap: 32px;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px 32px;
}

.stat span { display: block; }
.stat .val { font-size: 22px; font-weight: 700; color: var(--accent); }
.stat .lbl { font-size: 11px; color: var(--text-muted); letter-spacing: 1px; text-transform: uppercase; }

/* ═══════════════════════ CONTROLS ═══════════════════════ */
.controls {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto 28px;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Search */
.search-wrap {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
  pointer-events: none;
}

.search-input {
  width: 100%;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px 12px 44px;
  font-size: 15px;
  color: var(--text);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}

.search-input::placeholder { color: var(--text-muted); }

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,212,255,.1);
}

/* Category tabs */
.cat-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.cat-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.03);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}

.cat-tab:hover {
  border-color: rgba(0,212,255,.5);
  color: var(--text);
  background: rgba(0,212,255,.06);
}

.cat-tab.active {
  background: linear-gradient(135deg, rgba(124,58,237,.25), rgba(0,212,255,.15));
  border-color: var(--accent);
  color: var(--accent);
}

.cat-tab .cat-count {
  background: rgba(255,255,255,.08);
  border-radius: 999px;
  padding: 1px 7px;
  font-size: 11px;
  font-weight: 700;
}

.cat-tab.active .cat-count {
  background: rgba(0,212,255,.2);
  color: var(--accent);
}

/* Results info */
.results-info {
  font-size: 13px;
  color: var(--text-muted);
}

.results-info strong { color: var(--accent); }

/* ═══════════════════════ GRID ═══════════════════════ */
.grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: 200px;
}

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 64px 24px;
  color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state p { font-size: 16px; }

/* ═══════════════════════ CARD ═══════════════════════ */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  cursor: pointer;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(0,212,255,.06));
  pointer-events: none;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,.4), 0 0 0 1px var(--accent);
  border-color: var(--accent);
}

.card-num {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 1px;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}

.card h2 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.3;
}

.card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── Tags ── */
.tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: .5px;
}

.tag-ai       { background: rgba(0,212,255,.12);   color: var(--accent); }
.tag-game     { background: rgba(124,58,237,.15);  color: #a78bfa; }
.tag-eco      { background: rgba(16,185,129,.12);  color: var(--green); }
.tag-edu      { background: rgba(56,189,248,.12);  color: #38bdf8; }
.tag-creative { background: rgba(245,158,11,.12);  color: var(--accent3); }

/* Arrow button */
.arrow-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0,212,255,.12);
  border: 1px solid rgba(0,212,255,.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: background .2s;
}

.card:hover .arrow-btn { background: var(--accent); color: #000; }

/* ═══════════════════════ PAGINATION ═══════════════════════ */
.pagination {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 40px 24px 64px;
  flex-wrap: wrap;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.03);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all .2s;
}

.page-btn:hover:not(:disabled) {
  border-color: rgba(0,212,255,.5);
  color: var(--text);
  background: rgba(0,212,255,.08);
}

.page-btn.active {
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,212,255,.3);
}

.page-btn:disabled {
  opacity: .35;
  cursor: not-allowed;
}

.page-dots {
  color: var(--text-muted);
  font-size: 14px;
  padding: 0 4px;
  display: flex;
  align-items: center;
}

/* ═══════════════════════ MODAL ═══════════════════════ */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  backdrop-filter: blur(6px);
  z-index: 100;
  align-items: flex-start;
  justify-content: center;
  padding: 24px;
  overflow-y: auto;
}

.overlay.open { display: flex; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  width: 100%;
  max-width: 680px;
  margin: auto;
  overflow: hidden;
  animation: slideUp .3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.modal-header {
  padding: 28px 28px 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.modal-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  flex-shrink: 0;
}

.modal-title { flex: 1; }
.modal-title h2 { font-size: 20px; font-weight: 800; margin-bottom: 6px; }
.modal-title .subtitle { font-size: 13px; color: var(--text-muted); }

.close-btn {
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .2s, color .2s;
}

.close-btn:hover { background: var(--red); color: #fff; border-color: var(--red); }

.modal-body { padding: 24px 28px 28px; }

.section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.desc-box {
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 20px;
}

.feat-list { list-style: none; margin-bottom: 24px; }

.feat-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 9px 0;
  border-bottom: 1px solid rgba(255,255,255,.05);
  font-size: 14px;
  line-height: 1.5;
}

.feat-list li:last-child { border-bottom: none; }

.feat-list li::before {
  content: '✦';
  color: var(--accent);
  font-size: 10px;
  flex-shrink: 0;
  margin-top: 4px;
}

/* Hint */
.hint-section { margin-top: 4px; }

.hint-toggle-btn {
  width: 100%;
  background: linear-gradient(135deg, rgba(124,58,237,.2), rgba(0,212,255,.12));
  border: 1px solid rgba(0,212,255,.3);
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background .2s, box-shadow .2s;
  letter-spacing: .5px;
}

.hint-toggle-btn:hover {
  background: linear-gradient(135deg, rgba(124,58,237,.35), rgba(0,212,255,.25));
  box-shadow: 0 0 20px rgba(0,212,255,.2);
}

.hint-box {
  display: none;
  margin-top: 12px;
  background: rgba(0,0,0,.3);
  border: 1px solid rgba(0,212,255,.25);
  border-radius: 12px;
  overflow: hidden;
}

.hint-box.visible { display: block; animation: fadeIn .25s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hint-bar {
  background: rgba(0,212,255,.06);
  border-bottom: 1px solid rgba(0,212,255,.15);
  padding: 8px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hint-bar span {
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.copy-btn {
  background: rgba(0,212,255,.12);
  border: 1px solid rgba(0,212,255,.3);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: background .2s;
}

.copy-btn:hover { background: var(--accent); color: #000; }
.copy-btn.copied { background: var(--green); border-color: var(--green); color: #fff; }

.hint-prompt {
  padding: 16px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 13px;
  line-height: 1.7;
  color: #c8e6f7;
  white-space: pre-wrap;
}

/* ═══════════════════════ FOOTER ═══════════════════════ */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
}

footer strong { color: var(--accent); }

/* ═══════════════════════ RESPONSIVE ═══════════════════════ */
@media (max-width: 640px) {
  .stats { gap: 16px; padding: 12px 20px; }
  .cat-tabs { gap: 6px; }
  .cat-tab { padding: 6px 12px; font-size: 12px; }
  .modal-header { flex-wrap: wrap; }
  .modal-body { padding: 20px; }
  .pagination { gap: 6px; }
  .page-btn { min-width: 36px; height: 36px; font-size: 13px; }
}