:root {
  --bg: #0b0d12;
  --bg-grad: radial-gradient(1200px 600px at 10% -10%, rgba(108,140,255,0.16), transparent 60%),
             radial-gradient(900px 500px at 100% 0%, rgba(118,185,0,0.08), transparent 55%),
             var(--bg);
  --panel: #151822;
  --panel-2: #1b1f2b;
  --panel-glass: rgba(21, 24, 34, 0.72);
  --border: #2a2f3d;
  --border-soft: rgba(255,255,255,0.06);
  --text: #eef0f4;
  --muted: #94a0b2;
  --accent: #6c8cff;
  --accent-2: #ff6c8c;
  --success: #4caf7d;
  --nvidia: #76b900;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-soft: 0 8px 24px rgba(0,0,0,0.28);
  --shadow-pop: 0 14px 40px rgba(0,0,0,0.38);
}

* { box-sizing: border-box; }

::selection { background: rgba(108,140,255,0.35); }

* { scrollbar-width: thin; scrollbar-color: #3a4155 transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-thumb { background: #3a4155; border-radius: 20px; }
*::-webkit-scrollbar-track { background: transparent; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, "Segoe UI", system-ui, Roboto, Arial, sans-serif;
  background: var(--bg-grad);
  background-attachment: fixed;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--panel-glass);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 10;
}

header.topbar .brand {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.3px;
}

header.topbar .brand span {
  background: linear-gradient(135deg, var(--accent), #9a6cff 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.topbar-right {
  display: flex;
  align-items: center;
}

nav.topnav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 26px;
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
  transition: color 0.2s ease;
}

nav.topnav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: right 0.25s ease;
}

nav.topnav a:hover { color: var(--text); }
nav.topnav a:hover::after,
nav.topnav a.active::after { right: 0; }
nav.topnav a.active { color: var(--text); }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 24px;
  padding: 3px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.4px;
  padding: 5px 11px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-btn:hover { color: var(--text); }

.lang-btn.active {
  background: linear-gradient(135deg, var(--accent), #8a7bff);
  color: #fff;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.hero {
  padding: 48px 0 28px;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin: 0 0 10px;
  background: linear-gradient(135deg, #ffffff, #b9c2d6 70%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p { color: var(--muted); margin: 0; font-size: 1.02rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.card {
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-pop);
  border-color: rgba(108,140,255,0.35);
}

.card .product-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: var(--panel-2);
}
.card h3 { margin: 0; font-size: 1.05rem; font-weight: 700; }
.card .category {
  color: var(--accent);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 700;
}
.card .desc { color: var(--muted); font-size: 0.85rem; flex-grow: 1; line-height: 1.45; }
.card .price-row { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; }
.card .price { font-weight: 800; font-size: 1.15rem; }
.card .stock { color: var(--muted); font-size: 0.75rem; }

.btn {
  background: linear-gradient(135deg, var(--accent), #8a7bff);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1px;
  box-shadow: 0 6px 16px rgba(108,140,255,0.28);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}

.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(108,140,255,0.4); }
.btn:active { transform: translateY(0); }
.btn.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  box-shadow: none;
}
.btn.secondary:hover { background: var(--panel-2); box-shadow: none; }

.toggle-comments { margin-top: 4px; }

.product-comments {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.comment-form input, .comment-form textarea, .comment-form select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.comment-form input:focus, .comment-form textarea:focus, .comment-form select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108,140,255,0.18);
}

.comment-list { display: flex; flex-direction: column; gap: 10px; }

.comment-list .no-comments { color: var(--muted); font-size: 0.82rem; margin: 0; }

.comment-item {
  background: var(--panel-2);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

.comment-item .meta {
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.comment-item .author { color: var(--accent); font-weight: 700; }

.delete-comment {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 4px;
  transition: color 0.15s;
}
.delete-comment:hover { color: var(--accent-2); }

/* --- chatbot page --- */

.chat-layout {
  display: grid;
  grid-template-columns: 270px 1fr;
  gap: 24px;
}

.level-panel {
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 18px;
  height: fit-content;
  box-shadow: var(--shadow-soft);
}

.level-panel h3 {
  margin-top: 0;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 700;
}

.level-option {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.level-option:hover { transform: translateX(2px); background: #202432; }
.level-option strong { display: block; margin-bottom: 3px; }
.level-option small { color: var(--muted); }

.level-option.active {
  border-color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(108,140,255,0.12);
  box-shadow: 0 0 0 1px rgba(108,140,255,0.25) inset;
}

.level-option[data-level="facil"] { border-left-color: var(--success); }
.level-option[data-level="medio"] { border-left-color: #e0b84c; }
.level-option[data-level="moderado"] { border-left-color: var(--accent-2); }
.level-option[data-level="dificil"] { border-left-color: #8a8fa0; }
.level-option[data-level="super_dificil"] { border-left-color: var(--nvidia); }
.level-option[data-level="super_dificil"].active {
  border-color: var(--nvidia);
  border-left-color: var(--nvidia);
  background: rgba(118,185,0,0.12);
  box-shadow: 0 0 0 1px rgba(118,185,0,0.3) inset;
}

.hint-toggle {
  display: block;
  width: 100%;
  margin-top: 6px;
  background: var(--panel-2);
  border: 1px dashed var(--border);
  color: var(--muted);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  text-align: left;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.hint-toggle:hover { border-color: var(--accent); color: var(--text); }

.hint-box {
  margin-top: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(224,184,76,0.08);
  border: 1px solid rgba(224,184,76,0.35);
  color: var(--text);
  font-size: 0.82rem;
  line-height: 1.45;
  display: none;
}

.hint-box.open { display: block; }

.level-badge {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--panel-2);
  color: var(--muted);
}

.chat-window {
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  height: 70vh;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.msg {
  max-width: 78%;
  padding: 11px 15px;
  border-radius: 16px;
  font-size: 0.92rem;
  line-height: 1.45;
  white-space: pre-wrap;
  animation: msg-in 0.2s ease;
}
.msg.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--accent), #8a7bff);
  color: #fff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 14px rgba(108,140,255,0.3);
}
.msg.bot {
  align-self: flex-start;
  background: var(--panel-2);
  border: 1px solid var(--border-soft);
  border-bottom-left-radius: 4px;
}
.msg.bot.blocked {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 1px rgba(255,108,140,0.2) inset;
}
.msg.system-note {
  align-self: center;
  color: var(--muted);
  font-size: 0.75rem;
  font-style: italic;
}

.submit-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px 16px;
}

.btn.submit-conversation {
  background: transparent;
  border: 1px solid var(--nvidia);
  color: var(--nvidia);
  flex-shrink: 0;
  font-weight: 700;
  box-shadow: none;
}

.btn.submit-conversation:hover:not(:disabled) { background: rgba(118,185,0,0.12); transform: translateY(-1px); box-shadow: none; }
.btn.submit-conversation:disabled { opacity: 0.6; cursor: default; transform: none; }

.submit-note {
  display: none;
  font-size: 0.78rem;
  line-height: 1.4;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  animation: msg-in 0.2s ease;
}

.submit-note.open { display: block; }

.submit-note.success { color: var(--success); background: rgba(76,175,125,0.12); border: 1px solid rgba(76,175,125,0.3); }
.submit-note.error { color: var(--accent-2); background: rgba(255,108,140,0.1); border: 1px solid rgba(255,108,140,0.25); }
.submit-note.warning { color: #e0b84c; background: rgba(224,184,76,0.1); border: 1px solid rgba(224,184,76,0.3); }

.chat-input-row {
  display: flex;
  gap: 10px;
  padding: 16px;
  border-top: 1px solid var(--border-soft);
}

.chat-input-row textarea {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 18px;
  font-size: 0.92rem;
  font-family: inherit;
  resize: none;
  max-height: 150px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.chat-input-row textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108,140,255,0.18);
}

.objectives {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--border-soft);
}

.objectives h2 {
  margin: 0 0 6px;
  font-size: 1.3rem;
  font-weight: 800;
}

.objectives-intro {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 20px;
}

.objectives-intro code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 0.85em;
  color: var(--text);
}

.objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.goal-card {
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.goal-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-pop);
  border-color: rgba(118,185,0,0.35);
}

.goal-card .goal-icon {
  display: inline-block;
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.goal-card h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 700;
}

.goal-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.goal-card code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 4px;
  font-size: 0.85em;
}

.footer-note {
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}