:root {
  --bg: #f4f7fa;
  --surface: #ffffff;
  --text: #1f2a37;
  --muted: #6b7280;
  --primary: #0a7ea4;
  --primary-hover: #086483;
  --border: #e5e7eb;
  --error: #b42318;
  --error-bg: #fee4e2;
  --radius: 10px;
  --shadow: 0 4px 14px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

body { display: flex; flex-direction: column; min-height: 100vh; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
  letter-spacing: 0.2px;
}
.brand-link { text-decoration: none; }

.nav { display: flex; align-items: center; gap: 0.75rem; }

.site-footer {
  margin-top: auto;
  padding: 1rem 1.5rem;
  text-align: center;
  color: var(--muted);
}

/* Home / hero */
.hero {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.hero-card {
  background: var(--surface);
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 520px;
  width: 100%;
}

.hero-card h1 { margin: 0 0 0.5rem; font-size: 1.6rem; }
.hero-card p { color: var(--muted); margin: 0 0 1.5rem; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: var(--primary-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--bg); }

.btn-block { width: 100%; }

/* Auth */
.auth-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.auth-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 380px;
}

.auth-card h1 { margin: 0 0 0.25rem; font-size: 1.4rem; }
.auth-card .muted { margin: 0 0 1.5rem; }

.auth-card label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0.75rem 0 0.35rem;
}

.auth-card input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}

.auth-card input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(10, 126, 164, 0.15);
}

.auth-card .hint {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.auth-card .back {
  margin: 0.5rem 0 0;
  text-align: center;
  font-size: 0.9rem;
}

.error {
  background: var(--error-bg);
  color: var(--error);
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius);
  margin: 1rem 0 0;
  font-size: 0.9rem;
}

.muted { color: var(--muted); }

/* Dashboard */
.dashboard {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

.dashboard h1 { margin-top: 0; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card h2 { margin: 0 0 0.5rem; font-size: 1.05rem; color: var(--primary); }
.card p { margin: 0; color: var(--muted); }