:root {
  --bg: #0b0d17;
  --bg-2: #12142400;
  --card: #151827;
  --card-hover: #1c2033;
  --border: #262a3d;
  --text: #e8eaf2;
  --muted: #8a90a8;
  --primary: #6d5efc;
  --primary-2: #22d3ee;
  --accent: #ff5c8a;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 20% -10%, #1a1f3a 0%, transparent 60%),
              radial-gradient(900px 500px at 100% 0%, #1e2a4a 0%, transparent 55%),
              var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 13, 23, 0.7);
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo { font-size: 22px; }
.brand-name { letter-spacing: 0.3px; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.hero { text-align: center; margin-bottom: 40px; }
.hero h1 {
  font-size: clamp(28px, 5vw, 44px);
  margin: 0 0 12px;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.hero .grad {
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p { color: var(--muted); margin: 0; font-size: 16px; }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  text-align: left;
  color: var(--text);
  font: inherit;
}
.tool-card:hover {
  background: var(--card-hover);
  border-color: #3a3f5c;
  transform: translateY(-3px);
}
.tool-icon { font-size: 26px; display: block; margin-bottom: 10px; }
.tool-name { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.tool-desc { font-size: 13px; color: var(--muted); line-height: 1.5; }

.panel {
  margin-top: 32px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}
.panel-head h2 { margin: 0; font-size: 20px; }
.panel-desc { color: var(--muted); margin: 0 0 16px; font-size: 14px; }

.input-box {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  background: #0f1220;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  font-size: 14px;
  line-height: 1.6;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s ease;
}
.input-box:focus { border-color: var(--primary); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0;
}

.primary-btn, .ghost-btn {
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  font-family: inherit;
}

.primary-btn {
  background: linear-gradient(90deg, var(--primary), #8b7dff);
  color: white;
  box-shadow: 0 6px 18px rgba(109, 94, 252, 0.35);
}
.primary-btn:hover { filter: brightness(1.08); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.ghost-btn {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.ghost-btn:hover { background: #1b1f33; border-color: #3a3f5c; }

.output {
  background: #0f1220;
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 16px;
  min-height: 80px;
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  color: #d6d9e6;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 24px;
  border-top: 1px solid var(--border);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}
.modal-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.modal-card h3 { margin: 0 0 6px; }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 16px; }
.modal-card label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
}
.modal-card input {
  display: block;
  width: 100%;
  margin-top: 6px;
  background: #0f1220;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
}
.modal-card input:focus { border-color: var(--primary); }
.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 8px;
}

@media (max-width: 520px) {
  .container { padding: 24px 14px 60px; }
  .panel { padding: 18px; }
  .actions { flex-direction: column; }
  .primary-btn, .ghost-btn { width: 100%; text-align: center; }
}