:root {
  --bg: #0f1115;
  --bg-elevated: #171a21;
  --bg-card: #1c2028;
  --border: #2a2f3a;
  --text: #e8eaed;
  --text-dim: #9aa1ae;
  --accent: #4f8cff;
  --red: #ef5b5b;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(0,0,0,0.35);
  font-size: 16px;
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0 0 .4em 0; font-weight: 650; }
a { color: var(--accent); }

button { font-family: inherit; cursor: pointer; }
input { font-family: inherit; font-size: 1rem; }

/* ---------------- Login ---------------- */

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  width: 100%;
  max-width: 340px;
  text-align: center;
  box-shadow: var(--shadow);
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.login-card input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 8px;
  outline: none;
}
.login-card input:focus { border-color: var(--accent); }

.login-card button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 12px 14px;
  border-radius: 8px;
  font-weight: 600;
}
.login-card button:hover { background: #3f78e0; }

.login-error {
  color: var(--red);
  margin-top: 12px;
  min-height: 1.2em;
  font-size: .9rem;
}

/* ---------------- App shell (for pages after login) ---------------- */

.app-header {
  position: sticky;
  top: 0;
  background: rgba(15,17,21,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 550;
}
.icon-btn:hover { border-color: var(--accent); }
.btn-sm { padding: 6px 10px; font-size: .82rem; }

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 20px;
}