:root {
  --bg-1: #e8ecf1;
  --bg-2: #ffffff;
  --surface: rgba(255,255,255,0.92);
  --surface-2: #f1f4f8;
  --border: #d1d9e6;
  --border-hover: #3b82f680;
  --text-main: #1e293b;
  --text-muted: #5a6a7e;
  --text-dim: #8694a7;
  --accent: #1e56b0;
  --accent-strong: #163d82;
  --green: #059669;
  --green-bg: #ecfdf5;
  --amber: #d97706;
  --amber-bg: #fffbeb;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.15), 0 8px 20px rgba(0,0,0,0.1);
  --radius: 1rem;
}

* { box-sizing: border-box; margin: 0; }
html, body { min-height: 100%; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-main);
  background: var(--bg-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.backdrop {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, #1e56b012 0%, transparent 100%),
    radial-gradient(ellipse 60% 40% at 80% 100%, #64748b0a 0%, transparent 100%);
  pointer-events: none;
  z-index: -1;
}

.container { width: min(1100px, calc(100% - 2rem)); margin-inline: auto; }

/* ── Hero ────────────────────────────────────────── */
.hero {
  position: relative;
  padding: 4rem 2rem 3rem;
  margin-top: 1rem;
  border-radius: var(--radius);
  background: url('hero-bg.png') center/cover no-repeat, linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #0f172a 100%);
  overflow: hidden;
  animation: fade-in 0.6s ease;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(30,64,175,0.82) 0%, rgba(15,23,42,0.75) 100%);
  z-index: 0;
}

.hero > * { position: relative; z-index: 1; }

.hero-icon { color: #fff; margin-bottom: 0.75rem; }

.eyebrow {
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #93c5fd;
  font-size: 0.78rem;
  font-weight: 600;
}

h1 {
  margin: 0.4rem 0 0;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.lead {
  max-width: 58ch;
  margin-top: 1rem;
  color: #cbd5e1;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.hero-badges span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 999px;
  padding: 0.38rem 0.85rem;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  font-size: 0.82rem;
  font-weight: 500;
  color: #e2e8f0;
}

.hero-badges svg { color: #93c5fd; flex-shrink: 0; }

/* ── Sections ────────────────────────────────────── */
section { margin-top: 2.5rem; }

.section-head { margin-bottom: 1.15rem; }
.section-head h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.section-head p { margin-top: 0.3rem; color: var(--text-muted); font-size: 0.95rem; }

/* ── Tool grid ───────────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-2);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.tool-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.tool-card.featured {
  border-color: #3b82f660;
  background: linear-gradient(135deg, #eef4ff 0%, #ffffff 100%);
  box-shadow: var(--shadow), 0 0 0 1px #3b82f615;
}

.model-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.15rem;
}

.chip {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.chip.local { background: #ecfdf5; color: var(--green); border: 1px solid #a7f3d0; }
.chip.cloud { background: #fffbeb; color: var(--amber); border: 1px solid #fde68a; }

.tool-icon {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 0.75rem;
  margin-bottom: 0.15rem;
}

.chat-icon      { background: #dbeafe; color: #2563eb; }
.image-icon     { background: #ede9fe; color: #7c3aed; }
.audio-icon     { background: #d1fae5; color: #059669; }
.translate-icon { background: #fef3c7; color: #d97706; }
.address-icon   { background: #fce7f3; color: #db2777; }

.tool-badge {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.tool-card h3 { font-size: 1.12rem; font-weight: 700; }
.tool-card p  { color: var(--text-muted); font-size: 0.9rem; line-height: 1.5; }

.tool-actions { margin-top: auto; padding-top: 0.3rem; display: flex; gap: 0.5rem; }

/* ── Buttons ─────────────────────────────────────── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 0.6rem;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: filter 0.15s, transform 0.15s;
}

.button:hover { filter: brightness(1.08); transform: translateY(-1px); }

.button.primary {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  box-shadow: 0 2px 8px rgba(37,99,235,0.25);
}

.button.disabled {
  background: #f1f5f9;
  color: var(--text-dim);
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.5;
}

.tool-local-note {
  font-size: 0.75rem;
  color: var(--amber);
  font-weight: 500;
  margin-top: -0.25rem;
}

.button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.button.ghost:hover { border-color: var(--accent); color: var(--text-main); }

.mindmap-panel .button.ghost {
  border-color: rgba(255,255,255,0.2);
  color: #94a3b8;
}
.mindmap-panel .button.ghost:hover { border-color: #60a5fa; color: #e2e8f0; }

/* ── Safety panel ────────────────────────────────── */
.safety-panel {
  border: none;
  border-radius: var(--radius);
  padding: 1.5rem;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  box-shadow: var(--shadow-lg);
  color: #cbd5e1;
}

.safety-panel .section-head h2 { color: #f1f5f9; }
.safety-panel .section-head h2 svg { color: #60a5fa; }
.safety-panel .section-head p { color: #94a3b8; }

.safety-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.safety-card {
  border-radius: 0.75rem;
  padding: 1.1rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.safety-card h3 {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
}

.safety-card ul {
  padding-left: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.safety-card li {
  font-size: 0.88rem;
  line-height: 1.5;
  color: #cbd5e1;
}

.safety-card li strong { color: #f1f5f9; }

.safety-card.safe {
  background: rgba(5,150,105,0.12);
  border: 1px solid rgba(5,150,105,0.3);
}
.safety-card.safe h3 { color: #34d399; }
.safety-card.safe h3 svg { color: #34d399; }

.safety-card.caution {
  background: rgba(217,119,6,0.12);
  border: 1px solid rgba(217,119,6,0.3);
}
.safety-card.caution h3 { color: #fbbf24; }
.safety-card.caution h3 svg { color: #fbbf24; }

.safety-footer {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.safety-footer p {
  font-size: 0.88rem;
  color: #94a3b8;
  line-height: 1.55;
}
.safety-footer p strong { color: #e2e8f0; }
.safety-footer a { color: #60a5fa; text-decoration: underline; text-underline-offset: 2px; }

/* ── LLM panel ───────────────────────────────────── */
.llm-panel {
  border: none;
  border-radius: var(--radius);
  padding: 1.5rem;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  box-shadow: var(--shadow-lg);
  color: #cbd5e1;
}

.llm-panel .section-head h2 { color: #f1f5f9; }
.llm-panel .section-head h2 svg { color: #60a5fa; }
.llm-panel .section-head p { color: #94a3b8; }

.llm-how-to {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding: 1rem;
  background: rgba(255,255,255,0.06);
  border-radius: 0.75rem;
  border: 1px solid rgba(255,255,255,0.1);
}

.how-to-step {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 1;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-strong);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.how-to-step p {
  font-size: 0.88rem;
  color: #94a3b8;
}

.how-to-step p strong { color: #e2e8f0; }

.llm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
}

.llm-card {
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 0.75rem;
  background: rgba(255,255,255,0.05);
  padding: 1rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.llm-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  background: rgba(255,255,255,0.08);
}

.llm-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.45rem;
}

.llm-tag.local { background: rgba(5,150,105,0.2); color: #34d399; }
.llm-tag.cloud { background: rgba(217,119,6,0.2); color: #fbbf24; }

.llm-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}

.llm-recommended {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #60a5fa;
}

.llm-card.recommended {
  border-color: rgba(96,165,250,0.3);
  background: rgba(96,165,250,0.1);
  box-shadow: 0 2px 12px rgba(0,0,0,0.2), 0 0 0 1px rgba(96,165,250,0.2);
}

.llm-speed {
  font-size: 0.78rem;
  font-weight: 600;
  color: #64748b;
  margin-top: 0.15rem;
}

.llm-card h3 { font-size: 0.98rem; font-weight: 700; color: #f1f5f9; }
.llm-card p  { margin-top: 0.35rem; color: #94a3b8; font-size: 0.88rem; }
.llm-card p strong { color: #e2e8f0; }

.llm-card-wide {
  grid-column: 1 / -1;
}

.llm-details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}

@media (max-width: 600px) {
  .llm-details-grid { grid-template-columns: 1fr; }
}

.llm-detail-col { min-width: 0; }

.llm-detail-title {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.45rem;
}

.llm-detail-title.can-do    { color: #34d399; }
.llm-detail-title.cannot-do { color: #f87171; }

.llm-detail-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.llm-detail-list li {
  font-size: 0.82rem;
  color: #94a3b8;
  line-height: 1.45;
  padding-left: 0.6rem;
  position: relative;
}

.llm-detail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.4;
}

.llm-detail-list li strong {
  color: #e2e8f0;
}

.llm-detail-list li em {
  color: #cbd5e1;
  font-style: italic;
}

.llm-use-cases {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.6rem;
}

.llm-use-cases span {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  color: #94a3b8;
}

.caution-text { color: #fbbf24; }

/* ── Mindmap panel ───────────────────────────────── */
.mindmap-panel {
  border: none;
  border-radius: var(--radius);
  padding: 1.5rem;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  box-shadow: var(--shadow-lg);
  color: #cbd5e1;
}

.mindmap-panel .section-head h2 { color: #f1f5f9; }
.mindmap-panel .section-head p { color: #94a3b8; }

.mindmap-workspace {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(300px, 1.4fr);
  gap: 1rem;
}

.editor-wrap { display: flex; flex-direction: column; gap: 0.5rem; }
.editor-wrap label { font-weight: 600; font-size: 0.9rem; color: #e2e8f0; }

textarea {
  width: 100%;
  min-height: 280px;
  border-radius: 0.65rem;
  border: 1px solid rgba(255,255,255,0.12);
  padding: 0.8rem;
  background: rgba(255,255,255,0.05);
  color: #e2e8f0;
  font-family: "Cascadia Code", "Fira Code", "Consolas", monospace;
  font-size: 0.88rem;
  resize: vertical;
  transition: border-color 0.2s;
}
textarea:focus { outline: none; border-color: #60a5fa; }

.editor-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.status { min-height: 1.2rem; color: #60a5fa; font-size: 0.85rem; }

.map-wrap {
  min-height: 340px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 0.65rem;
  overflow: hidden;
  background: #ffffff;
}

#mindmapSvg { width: 100%; height: 100%; min-height: 340px; }

/* ── Footer ──────────────────────────────────────── */
.footer {
  margin-top: 2.5rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
  background: var(--bg-2);
  box-shadow: 0 -4px 20px rgba(0,0,0,0.04);
}

.footer-inner { text-align: center; }
.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer-note { margin-top: 0.25rem; color: var(--text-dim); font-size: 0.8rem; }

/* ── Animations ──────────────────────────────────── */
@keyframes fade-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 920px) {
  .mindmap-workspace { grid-template-columns: 1fr; }
  .map-wrap, #mindmapSvg { min-height: 300px; }
}

@media (max-width: 640px) {
  .tool-grid { grid-template-columns: 1fr; }
  .safety-grid { grid-template-columns: 1fr; }
  .llm-how-to { flex-direction: column; gap: 0.6rem; }
  .hero { padding-top: 2rem; }
}