/* Responsive Multi-View Tester — Design Purple theme */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #6C5CE7;
  --primary-dim: rgba(108,92,231,0.12);
  --primary-glow: rgba(108,92,231,0.3);
  --secondary: #A29BFE;
  --accent: #00CEC9;
  --accent-dim: rgba(0,206,201,0.12);
  --bg: #0D1117;
  --bg-card: #161B22;
  --bg-input: #0B0F14;
  --border: rgba(108,92,231,0.15);
  --border-focus: rgba(108,92,231,0.5);
  --text: #E6E8EB;
  --text-dim: #8B949E;
  --text-muted: #484F58;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif;
  --transition: 0.2s ease;
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; line-height: 1.6; }

.header { border-bottom: 1px solid var(--border); background: rgba(22,27,34,0.95); backdrop-filter: blur(12px); position: sticky; top: 0; z-index: 10; }
.header-inner { max-width: 100%; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.header-left { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon { font-size: 1.1rem; width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; background: var(--primary-dim); border-radius: var(--radius-sm); }
.header h1 { font-size: 0.95rem; font-weight: 700; }
.subtitle { font-size: 0.68rem; color: var(--text-dim); }

.header-actions { display: flex; align-items: center; gap: 6px; flex: 1; max-width: 600px; }
.url-input { flex: 1; padding: 6px 10px; font-family: var(--font); font-size: 0.78rem; color: var(--text); background: var(--bg-input); border: 1px solid var(--border); border-radius: 6px; outline: none; }
.url-input:focus { border-color: var(--border-focus); }
.layout-select { padding: 6px 8px; font-family: var(--font); font-size: 0.75rem; color: var(--text-dim); background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; outline: none; cursor: pointer; }

.btn { display: inline-flex; align-items: center; gap: 4px; padding: 6px 14px; font-family: var(--font); font-size: 0.78rem; font-weight: 600; border: none; border-radius: 6px; cursor: pointer; transition: all var(--transition); }
.btn-primary { background: linear-gradient(135deg, var(--primary), #5A4BD1); color: #fff; }
.btn-primary:hover { box-shadow: 0 4px 16px var(--primary-glow); transform: translateY(-1px); }

.main { padding: 16px; display: grid; gap: 12px; grid-template-columns: repeat(2, 1fr); min-height: calc(100vh - 60px); }
.main.layout-3x1 { grid-template-columns: repeat(3, 1fr); }
.main.layout-4x1 { grid-template-columns: repeat(4, 1fr); }

.viewport-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; min-height: 300px; }
.viewport-header { display: flex; align-items: center; justify-content: space-between; padding: 6px 10px; border-bottom: 1px solid var(--border); flex-shrink: 0; }
.viewport-label { font-size: 0.72rem; font-weight: 600; color: var(--accent); }
.viewport-size { font-size: 0.68rem; color: var(--text-muted); }
.viewport-toggle { background: none; border: 1px solid var(--border); color: var(--text-muted); padding: 2px 6px; border-radius: 3px; cursor: pointer; font-size: 0.62rem; transition: all var(--transition); }
.viewport-toggle:hover { border-color: var(--primary); color: var(--primary); }

.viewport-frame-wrap { flex: 1; overflow: hidden; display: flex; align-items: flex-start; justify-content: center; padding: 8px; background: var(--bg-input); }
.viewport-frame-wrap iframe { border: none; background: #fff; border-radius: 4px; box-shadow: 0 2px 12px rgba(0,0,0,0.3); transform-origin: top center; }

.toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 200; display: flex; flex-direction: column-reverse; gap: 8px; }
.toast { padding: 10px 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: 0 4px 24px rgba(0,0,0,0.5); font-size: 0.82rem; animation: toastIn 0.3s ease; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }