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

:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

body {
  background: radial-gradient(circle at top, #181a35 0, #050614 45%, #02020a 100%);
  color: #f7f7ff;
  min-height: 100vh;
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: .03em;
}
.logo span {
  color: #8b5cf6;
}

.nav a {
  margin-left: 16px;
  font-size: 0.9rem;
  text-decoration: none;
  color: #cbd5ff;
  opacity: 0.85;
}
.nav a:hover {
  opacity: 1;
}

.main {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 20px;
}

.tool-card,
.info-card {
  background: rgba(12, 14, 35, 0.92);
  border-radius: 18px;
  padding: 20px 20px 22px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.48);
  border: 1px solid rgba(148, 163, 255, 0.18);
}

.tool-card h1 {
  font-size: 1.7rem;
  margin-bottom: 4px;
}

.subtitle {
  font-size: 0.95rem;
  color: #d1d5ff;
  margin-bottom: 12px;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.pill {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 255, 0.4);
  opacity: 0.9;
}
.pill.active {
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border: none;
  color: #f9fafb;
}

.field-label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 6px;
}

.input-row input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 255, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7ff;
  font-size: 0.9rem;
}
.input-row input::placeholder {
  color: #64748b;
}

.button-base {
  border: none;
  cursor: pointer;
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 500;
}

#paste-btn {
  composes: button-base;
  background: rgba(30, 64, 175, 0.8);
  color: #e5e7ff;
}
#paste-btn:hover {
  background: rgba(37, 99, 235, 1);
}

.hint {
  font-size: 0.8rem;
  color: #94a3b8;
  margin-bottom: 10px;
}

.select-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

select {
  flex-shrink: 0;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 255, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7ff;
  font-size: 0.85rem;
}

#generate-btn {
  flex: 1;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  background: linear-gradient(135deg, #6366f1, #ec4899);
  color: white;
  box-shadow: 0 14px 30px rgba(79, 70, 229, 0.6);
}
#generate-btn:hover {
  transform: translateY(-1px);
}

.status {
  font-size: 0.82rem;
  min-height: 18px;
  color: #f97373;
  margin-bottom: 6px;
}

.result.hidden {
  display: none;
}

.result h2 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.result video {
  width: 100%;
  border-radius: 12px;
  margin: 6px 0 10px;
  background: black;
}

.download-btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  background: linear-gradient(135deg, #22c55e, #14b8a6);
  color: #022c22;
}

.info-card h2 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.info-card ol {
  padding-left: 18px;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.small {
  font-size: 0.8rem;
  color: #cbd5f5;
}

.ad-card {
  margin-top: 12px;
}

.ad-slot {
  margin-top: 6px;
  padding: 18px;
  border-radius: 12px;
  border: 1px dashed rgba(248, 250, 252, 0.4);
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.8;
}

.footer {
  margin-top: 24px;
  font-size: 0.78rem;
  text-align: center;
  color: #94a3b8;
}

/* responsive */
@media (max-width: 840px) {
  .main {
    grid-template-columns: minmax(0, 1fr);
  }

  .top-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .nav a {
    margin-left: 0;
    margin-right: 12px;
  }
}