:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 1.1rem; text-decoration: none; color: var(--text); }
.site-nav { display: flex; gap: 16px; align-items: center; }
.link-btn {
  background: none; border: none; color: var(--primary);
  cursor: pointer; font: inherit; padding: 0;
}
.link-btn:hover { text-decoration: underline; }

main { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 32px 24px; }

.hero { text-align: center; padding: 40px 0 24px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); margin: 0 0 12px; }
.tagline { color: var(--primary); font-weight: 600; font-size: 1.05rem; letter-spacing: .01em; margin: 0 0 16px; }
.lead { color: var(--muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto 24px; }
.hint { color: var(--muted); font-size: 0.9rem; margin-top: 16px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 32px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.card h2 { margin-top: 0; font-size: 1.2rem; }
.card p { color: var(--muted); margin-bottom: 0; }

.btn-google {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 12px 22px; font-weight: 600; text-decoration: none;
  box-shadow: var(--shadow); transition: transform .08s ease, box-shadow .08s ease;
}
.btn-google:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(15,23,42,.12); }
.g-icon { flex: none; }

.btn-primary {
  background: var(--primary); color: #fff; border: none;
  border-radius: 999px; padding: 12px 22px; font-weight: 600;
  cursor: pointer; font-size: 1rem; align-self: flex-start;
}
.btn-primary:hover { background: var(--primary-dark); }

.auth-main { display: flex; align-items: center; justify-content: center; min-height: 70dvh; }
.auth-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); width: 100%; max-width: 420px; text-align: center; }
.auth-card.wide { max-width: 560px; text-align: left; }

.msg { border-radius: 10px; padding: 10px 14px; margin: 12px 0; font-size: 0.95rem; }
.msg-err { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.msg-ok { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }

form { display: flex; flex-direction: column; gap: 16px; margin-top: 16px; }
label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: 0.95rem; text-align: left; }
input, textarea {
  font: inherit; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 10px; background: #fff; color: var(--text);
}
input:focus, textarea:focus { outline: 3px solid rgba(37,99,235,.35); border-color: var(--primary); }
input[readonly] { background: #f1f5f9; color: var(--muted); }

.dashboard h1 { margin-bottom: 4px; }
.filter-bar { display: flex; gap: 12px; align-items: center; margin: 12px 0 4px; flex-wrap: wrap; }
.filter-bar input { flex: 1; min-width: 200px; }
.filter-bar .btn-sm { flex: none; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-top: 24px; box-shadow: var(--shadow); }
.panel h2 { margin-top: 0; }

.user-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-top: 16px; }
.user-card { border: 1px solid var(--border); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.user-card .avatar { width: 56px; height: 56px; border-radius: 50%; object-fit: cover; background: #e2e8f0; }
.user-card h3 { margin: 4px 0 0; font-size: 1.05rem; }
.user-card .meta { color: var(--muted); font-size: 0.85rem; }
.user-card .bio { font-size: 0.9rem; }
.user-card .actions { margin-top: auto; display: flex; gap: 8px; flex-wrap: wrap; }
.tag { display: inline-block; background: #eff6ff; color: var(--primary); border-radius: 999px; padding: 2px 10px; font-size: 0.8rem; }

.btn-sm { border: 1px solid var(--border); background: #fff; border-radius: 999px; padding: 6px 14px; font: inherit; font-size: 0.85rem; cursor: pointer; text-decoration: none; color: var(--text); display: inline-flex; align-items: center; gap: 6px; }
.btn-sm:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-sm.primary:hover { background: var(--primary-dark); color: #fff; }

.empty { color: var(--muted); font-style: italic; }

.site-footer { text-align: center; color: var(--muted); padding: 24px; font-size: 0.85rem; border-top: 1px solid var(--border); background: var(--surface); }

@media (max-width: 600px) {
  main { padding: 20px 16px; }
  .auth-card { padding: 24px 18px; }
}

:focus-visible { outline: 3px solid rgba(37,99,235,.5); outline-offset: 2px; }