:root {
  --bg: #0b0d10;
  --card: #131720;
  --text: #e7eaf0;
  --muted: #a9b1c3;
  --border: rgba(255,255,255,0.08);
  --error: #ffb4b4;
  --link: #9cc9ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
}

/* ---------------- NAV ---------------- */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
}

.logo {
  border: 1px solid rgba(255,255,255,0.15); /* white border */
  border-radius: 10px;
}

/* Desktop menu */
.nav-menu {
  display: inline-flex;
  gap: 10px;
}

.nav-btn {
  padding: 8px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  font-weight: 600;
}

.nav-btn:hover {
  background: rgba(255,255,255,0.06);
}

/* Hamburger */

.nav-toggle {
  display: none;
  width: 44px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.05);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(0,0,0,0.5);
  flex: 0 0 auto;
}

.nav-toggle .bar {
  width: 20px;
  height: 2px;
  margin: 3px 0;
  background: rgba(255,255,255,0.9);
  border-radius: 2px;
}

/* Mobile */

@media (max-width: 760px) {
  .nav-menu {
    position: absolute;
    right: 0;
    top: 56px;
    display: none;
    flex-direction: column;
    min-width: 200px;
    padding: 12px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: rgba(10,12,18,0.98);
    box-shadow: 0 20px 50px rgba(0,0,0,0.45);
  }

  .nav-menu[data-open="true"] {
    display: flex;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

/* ---------------- HEADER ---------------- */

.header h1 {
  margin: 0 0 6px;
  font-size: 28px;
}

.header p {
  margin: 0 0 18px;
  color: var(--muted);
}

/* ---------------- CARDS ---------------- */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  margin: 12px 0;
}

.cardInner {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

/* ---------------- GRID ---------------- */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 760px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------------- FORM ---------------- */

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

input,
select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  outline: none;
}

button {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
}

/* ---------------- UTIL ---------------- */

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

.footer {
  margin-top: 18px;
  color: var(--muted);
}