:root {
  --primary: #00dc82;
  --primary-hover: #00b36b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 0.5rem;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.75rem 1rem;
}
.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-main);
  text-decoration: none;
}
.logo span { color: var(--text-muted); font-weight: 400; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-primary { background-color: var(--primary); color: #ffffff; }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-outline { background-color: transparent; border-color: var(--border); color: var(--text-main); }
.btn-outline:hover { background-color: #f1f5f9; }
.btn-danger { background-color: #ef4444; color: #fff; }
.btn-danger:hover { background-color: #dc2626; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.5rem; }
.form-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px rgba(0, 220, 130, 0.2); }

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem 1rem; }
.center-box { max-width: 400px; margin: 4rem auto; }

/* Utils */
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary); }
.flex { display: flex; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.w-full { width: 100%; }
.text-center { text-align: center; }
.avatar {
  width: 64px; height: 64px; border-radius: 50%; background: var(--primary);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: bold; margin: 0 auto 1rem;
}
.msg { padding: 0.75rem; border-radius: var(--radius); margin-bottom: 1rem; text-align: center; font-size: 0.875rem; }
.msg.error { background: #fef2f2; color: #ef4444; border: 1px solid #fecaca; }
.msg.success { background: #f0fdf4; color: #16a34a; border: 1px solid #bbf7d0; }