:root {
  --bg: #eaf5f7;
  --ink: #11365a;
  --accent: #1f8f6a;
  --panel: #ffffff;
  --line: #9ec7d7;
  --accent-strong: #167657;
  --banner-bg: #0d3b66;
  --banner-text: #e9f6fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% -5%, #d7eef7 0%, transparent 38%),
    radial-gradient(circle at 90% 15%, #d9f3e8 0%, transparent 32%),
    linear-gradient(180deg, #dff1f6 0%, var(--bg) 62%, #dcefe8 100%);
  min-height: 100vh;
}

.banner {
  background: var(--banner-bg);
  color: var(--banner-text);
  padding: 0.75rem 1rem;
  text-align: center;
  border-bottom: 2px solid #2f9e78;
}

.banner a {
  color: #b8f2d4;
  font-weight: 600;
}

.banner a:hover {
  color: #dcfff0;
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
}

.carousel {
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: 0 8px 24px rgba(17, 54, 90, 0.15);
}

.frame {
  width: 100%;
  height: min(72vh, 700px);
  background: linear-gradient(145deg, #eef8fb, #e8f4ee);
  border: 1px solid var(--line);
  border-radius: 10px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.frame img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.controls {
  margin-top: 0.9rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.5rem 0.95rem;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-size: 0.95rem;
}

button:hover {
  background: var(--accent-strong);
}

.filename,
.status {
  margin: 0.6rem 0 0;
  text-align: center;
}

.filename {
  font-weight: 600;
}

.status {
  color: #2a6482;
}

@media (max-width: 700px) {
  .frame {
    height: min(58vh, 480px);
  }

  .controls {
    gap: 0.7rem;
  }
}