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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
}

.screen { min-height: 100vh; }

/* Login */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: #1e293b;
  padding: 2.5rem;
  border-radius: 12px;
  text-align: center;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 4px 24px rgba(0,0,0,.4);
}

.login-card h1 { margin-bottom: .5rem; font-size: 1.5rem; }
.login-card p { color: #94a3b8; margin-bottom: 1.5rem; }

.login-card input {
  width: 100%;
  padding: .75rem 1rem;
  border: 1px solid #334155;
  border-radius: 8px;
  background: #0f172a;
  color: #e2e8f0;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.login-card button {
  width: 100%;
  padding: .75rem;
  border: none;
  border-radius: 8px;
  background: #3b82f6;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}
.login-card button:hover { background: #2563eb; }

.error { color: #f87171; margin-top: .75rem; font-size: .9rem; }

/* App */
#app-screen { padding: 1.5rem 2rem; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
header h1 { font-size: 1.4rem; }

.btn-secondary {
  padding: .5rem 1rem;
  border: 1px solid #475569;
  border-radius: 6px;
  background: transparent;
  color: #e2e8f0;
  cursor: pointer;
  font-size: .85rem;
  transition: background .2s;
}
.btn-secondary:hover { background: #1e293b; }

/* Tabs */
.tabs {
  display: flex;
  gap: .5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid #334155;
  padding-bottom: .5rem;
}

.tab {
  padding: .5rem 1.25rem;
  border: none;
  border-radius: 6px 6px 0 0;
  background: transparent;
  color: #94a3b8;
  cursor: pointer;
  font-size: .9rem;
  transition: all .2s;
}
.tab.active { background: #1e293b; color: #e2e8f0; font-weight: 600; }
.tab:hover:not(.active) { color: #cbd5e1; }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Table */
.table-container { margin-top: 1rem; overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
th, td {
  padding: .6rem .8rem;
  text-align: left;
  border-bottom: 1px solid #1e293b;
}
th { color: #94a3b8; font-weight: 600; background: #1e293b; }
tr:hover td { background: #1e293b44; }

.placeholder { color: #64748b; padding: 2rem 0; text-align: center; }

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 700px;
}
.form-grid label {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .85rem;
  color: #94a3b8;
}
.form-grid input, .form-grid select {
  padding: .6rem .8rem;
  border: 1px solid #334155;
  border-radius: 6px;
  background: #1e293b;
  color: #e2e8f0;
  font-size: .9rem;
}
.form-grid button {
  grid-column: 1 / -1;
  padding: .75rem;
  border: none;
  border-radius: 8px;
  background: #3b82f6;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}
.form-grid button:hover { background: #2563eb; }

.result-box {
  margin-top: 1rem;
  padding: 1rem;
  background: #1e293b;
  border-radius: 8px;
  white-space: pre-wrap;
  word-break: break-all;
  font-size: .8rem;
  max-height: 400px;
  overflow-y: auto;
}