* {
  box-sizing: border-box;
}

:root {
  --bg-main: #0b1220;
  --bg-soft: #111a2e;
  --card: rgba(255, 255, 255, 0.96);
  --card-border: rgba(255, 255, 255, 0.2);
  --text-main: #0f172a;
  --text-soft: #475569;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #b42318;
  --success: #027a48;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at 10% 20%, #1e3a8a 0%, transparent 35%),
    radial-gradient(circle at 90% 10%, #0f766e 0%, transparent 30%),
    linear-gradient(145deg, var(--bg-main), var(--bg-soft));
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 18px 26px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.hero-kicker {
  margin: 0 0 8px;
  color: #93c5fd;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.78rem;
  font-weight: 700;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  color: #f8fafc;
  letter-spacing: 0.2px;
}

.subtitle {
  margin-top: 0;
  margin-bottom: 18px;
  color: #cbd5e1;
}

.badge-live {
  background: rgba(16, 185, 129, 0.18);
  border: 1px solid rgba(52, 211, 153, 0.45);
  color: #a7f3d0;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 8px 12px;
  white-space: nowrap;
}

.layout-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  box-shadow: 0 14px 38px rgba(15, 23, 42, 0.22);
  padding: 18px;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
}

.label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
  color: #0f172a;
}

.panel-upload h2,
.panel-tips h2,
.viewer-head h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.panel-text {
  margin: 0 0 10px;
  color: #64748b;
  font-size: 0.93rem;
}

input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-name {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px dashed #cbd5e1;
  background: #f8fafc;
  color: var(--text-soft);
  font-size: 0.93rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.actions-upload {
  align-items: center;
}

button {
  border: 0;
  border-radius: 10px;
  background: linear-gradient(180deg, #3b82f6, var(--primary));
  color: #fff;
  padding: 11px 16px;
  font-weight: 600;
  letter-spacing: 0.2px;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.28);
}

button:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #2563eb, var(--primary-hover));
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.status {
  margin-top: 14px;
  min-height: 22px;
  padding: 8px 10px;
  border-radius: 10px;
  font-weight: 600;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
}

.status.error {
  color: var(--danger);
  border-color: #fecaca;
  background: #fef2f2;
}

.status.success {
  color: var(--success);
  border-color: #bbf7d0;
  background: #f0fdf4;
}

.viewer {
  height: min(78vh, 860px);
}

.viewer-head {
  margin-bottom: 12px;
}

.tips-list {
  margin: 8px 0 0;
  padding-left: 18px;
  color: #334155;
  line-height: 1.6;
}

.tips-list li + li {
  margin-top: 6px;
}

#pdfFrame {
  width: 100%;
  height: 100%;
  border: 1px solid #dbe1ea;
  border-radius: 12px;
  background: #fff;
}

@media (max-width: 768px) {
  .container {
    padding-top: 24px;
  }

  .hero {
    flex-direction: column;
  }

  .layout-grid {
    grid-template-columns: 1fr;
  }

  .card {
    border-radius: 12px;
    padding: 14px;
  }

  .actions {
    flex-direction: column;
  }

  button {
    width: 100%;
  }

  .file-name {
    width: 100%;
  }
}