:root {
  --bg-1: #f4f6f8;
  --bg-2: #e7ecf2;
  --ink: #1f2937;
  --muted: #4b5563;
  --card: #ffffff;
  --line: #d1d9e3;
  --brand: #0f3a64;
  --brand-2: #1c5a94;
  --brand-soft: #eff4fa;
  --ok: #137333;
  --bad: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(145deg, rgba(15, 58, 100, 0.06) 0%, rgba(15, 58, 100, 0) 40%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 100%);
  min-height: 100vh;
}

.layout {
  width: min(1200px, 94vw);
  margin: 24px auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 10px 26px rgba(20, 35, 60, 0.08);
}

.eyebrow {
  margin: 0 0 8px 0;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 6px 0;
  font-size: 1.64rem;
  letter-spacing: 0.01em;
}

.subtitle {
  color: var(--muted);
}

.video-shell {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #0b1d2c;
}

video {
  width: 100%;
  display: block;
  min-height: 340px;
  object-fit: cover;
}

.pill {
  position: absolute;
  left: 12px;
  top: 12px;
  background: rgba(13, 29, 44, 0.82);
  color: #fff;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 14px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
}

.tab {
  border: 0;
  padding: 12px;
  background: #f5f7fa;
  color: #243447;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.tab.active {
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
  color: #fff;
}

.card {
  display: grid;
  gap: 11px;
  background: var(--brand-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.card h2 {
  margin: 0 0 4px 0;
  font-size: 1.1rem;
}

label {
  font-weight: 700;
  color: #2b3d52;
  font-size: 0.92rem;
}

input {
  width: 100%;
  padding: 12px 13px;
  border-radius: 10px;
  border: 1px solid #bcc8d7;
  font-size: 0.98rem;
  background: #fff;
  color: var(--ink);
}

input:focus {
  outline: none;
  border-color: var(--brand-2);
  box-shadow: 0 0 0 3px rgba(28, 90, 148, 0.12);
}

button.primary {
  border: 0;
  background: linear-gradient(120deg, #123e69, #1f619c);
  color: #fff;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.01em;
}

button.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result {
  margin-top: 14px;
  border: 1px dashed #bfd0e1;
  border-radius: 12px;
  padding: 12px;
  min-height: 64px;
  background: #f6f9fc;
  white-space: pre-wrap;
  font-size: 0.93rem;
}

.result.ok {
  border-color: #86d7a0;
  color: var(--ok);
}

.result.bad {
  border-color: #efb5ac;
  color: var(--bad);
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  video {
    min-height: 260px;
  }
}