/* V-STREAM Core Design System */
:root {
  --primary: #0052D9;
  --primary-light: #E8F3FF;
  --bg: #F2F3F5;
  --card-bg: #FFFFFF;
  --text-main: #1D2129;
  --text-sub: #86909C;
  --border: #E5E6EB;
  --nav-height: 64px;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
}

nav {
  height: var(--nav-height);
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 40px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.card {
  background: #fff;
  padding: 24px;
  border-radius: 14px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 20px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn-primary:hover { opacity: 0.9; }