/* Minimal, clean UI for Steganography Online */

/* Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

:root {
  --bg: #0f172a;           /* slate-900 */
  --panel: #111827;        /* gray-900 */
  --muted: #9ca3af;        /* gray-400 */
  --text: #e5e7eb;         /* gray-200 */
  --accent: #3b82f6;       /* blue-500 */
  --accent-600: #2563eb;   /* blue-600 */
  --border: #1f2937;       /* gray-800 */
}

body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Apple Color Emoji', 'Segoe UI Emoji', sans-serif;
  background: radial-gradient(1200px 800px at 20% -10%, #1f2937, #0b1020 50%, #060a18 100%);
  color: var(--text);
}

/* Container */
.container {
  max-width: 980px;
}

/* Header */
.page-header {
  border: none;
  padding-bottom: 0;
  margin-top: 24px;
  text-align: center;
}
.page-header h1 {
  font-weight: 600;
  letter-spacing: 0.2px;
}

/* Header logo image */
.header-logo {
  display: block;
  margin: 0 auto 10px;
  max-width: 420px;
  width: 100%;
  height: auto;
}

/* Tabs */
.nav-tabs {
  border-bottom: 1px solid var(--border);
}
.nav-tabs > li > a {
  color: var(--muted);
}
.nav-tabs > li.active > a,
.nav-tabs > li.active > a:focus,
.nav-tabs > li.active > a:hover {
  color: var(--text);
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--accent);
}
.nav-tabs > li > a:hover {
  background: transparent;
  border-color: transparent;
  color: var(--text);
}

/* Panels */
.alert-info {
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  border: 1px solid var(--border);
}

.form .form-control,
select.form-control {
  background: #0b1224;
  border: 1px solid var(--border);
  color: var(--text);
}
.form .form-control::placeholder {
  color: #7b8794;
}

/* Buttons */
.btn {
  border-radius: 8px;
  border: 1px solid var(--border);
}
.btn-default {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.btn-default:hover {
  background: var(--accent-600);
  border-color: var(--accent-600);
  color: white;
}

/* Image grids */
.images.row,
.decode.row {
  margin-top: 10px;
  padding-bottom: 70px;
}

.images .col-xs-4,
.decode .col-xs-4 {
  text-align: center;
}

.images h4,
.decode h4 {
  margin-top: 8px;
  font-size: 15px;
  color: var(--muted);
  font-weight: 600;
}

/* Canvases as thumbnails */
.images canvas,
.decode canvas {
  max-width: 100%;
  max-height: 180px;
  width: auto;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

/* Encoded canvas is clickable for download */
.images .message canvas { cursor: pointer; }
.images .message canvas:hover { box-shadow: 0 12px 34px rgba(0,0,0,0.4); }

/* Error + Binary blocks */
.error {
  background: #3f1d1d;
  color: #ffcccc;
  border: 1px solid #5f2a2a;
  padding: 10px 12px;
  border-radius: 8px;
}

.binary textarea,
.binary-decode textarea {
  background: #0b1224;
  color: var(--muted);
  border: 1px solid var(--border);
  min-height: 80px;
}

/* Footer */
footer {
  color: var(--muted);
}
footer a { color: var(--text); }

/* Floating capsule credit badge */
.credit-badge {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  background: rgba(17, 24, 39, 0.9); /* var(--panel) w/ slight transparency */
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 9999px; /* capsule */
  font-size: 12px;
  line-height: 1.2;
  box-shadow: 0 10px 25px rgba(0,0,0,0.35);
}
.credit-badge a {
  color: #93c5fd; /* lighter blue for contrast */
  text-decoration: none;
}
.credit-badge a:hover {
  color: #bfdbfe;
  text-decoration: underline;
}