/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0a0e27;
  --bg-card: #111530;
  --bg-input: #1a1f3a;
  --accent: #3375BB;
  --accent-light: #4a90d9;
  --success: #00c087;
  --danger: #f04f5e;
  --warning: #f5a623;
  --text-primary: #ffffff;
  --text-secondary: #8a8fb5;
  --text-muted: #555a7a;
  --border: #1e2448;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
  font-family: var(--font);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

/* ── App Shell (mobile-first, 390px wide) ── */
.app-shell {
  width: 100%;
  max-width: 430px;
  min-height: 100vh;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* ── Typography ── */
h1 { font-size: 26px; font-weight: 700; }
h2 { font-size: 20px; font-weight: 600; }
h3 { font-size: 16px; font-weight: 600; }
p  { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 15px 20px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  text-decoration: none;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { opacity: 0.9; }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}

.btn-outline:hover { border-color: var(--accent); }

.btn-ghost {
  background: var(--bg-input);
  color: var(--text-primary);
  border-radius: var(--radius-md);
}

/* ── Form Elements ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus { border-color: var(--accent); }
.form-control::placeholder { color: var(--text-muted); }

/* ── Card ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

/* ── Divider ── */
.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  color: var(--text-muted);
  font-size: 13px;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Toast notification ── */
.toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 20px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 999;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Bottom Nav ── */
.bottom-nav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 12px 0 20px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  position: sticky;
  bottom: 0;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 11px;
  padding: 4px 16px;
  border-radius: var(--radius-sm);
  transition: color 0.2s;
}

.nav-item.active,
.nav-item:hover { color: var(--accent); }

.nav-icon {
  font-size: 22px;
  line-height: 1;
}

/* ── Utility ── */
.text-center { text-align: center; }
.text-success { color: var(--success); }
.text-danger  { color: var(--danger); }
.text-muted   { color: var(--text-muted); }
.text-accent  { color: var(--accent); }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }