:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #111;
  --muted: #777;
  --border: #e5e7eb;
  --hover: #f7f7f9;
  --icon: #b5b7bb;
}

[data-theme="dark"] {
  --bg: #0e0f11;
  --card: #15161a;
  --text: #fff;
  --muted: #aaa;
  --border: #2a2b30;
  --hover: #1b1c21;
  --icon: #6f737b;
}

[data-theme="dark"] nav {
  background: rgba(21, 22, 26, 0.6);
  box-shadow: 0 10px 30px rgba(0,0,0,.45);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Inter, system-ui, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  transition: background .3s, color .3s;
}

/* ===== NAV ===== */
nav {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 92%;
  max-width: 1100px;
  padding: 14px 24px;
  background: rgba(255,255,255,.65);
  backdrop-filter: blur(18px) saturate(160%);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.12);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
}

.logo {
  font-family: 'Comfortaa', sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.5px;
  text-transform: lowercase;   /* makes AttoZip → attozip */
  cursor: pointer;
}
.logo:hover {
  color:#001B94;
}
.nav-right {
  display: flex;
  gap: 16px;
  align-items: center;
}

.toggle {
  font-size: .85rem;
  cursor: pointer;
  opacity: .7;
}
.toggle:hover { opacity: 1; }

.back {
  font-size: .85rem;
  text-decoration: none;
  color: var(--text);
  opacity: .6;
}
.back:hover { opacity: 1; }

.nav-spacer { height: 110px; }

/* ===== CARD ===== */
.card {
  width: 92%;
  max-width: 950px;
  margin: 0 auto 48px;
  padding: 36px;
  background: var(--card);
  border-radius: 22px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0,0,0,.12);
}

/* ===== HEADER ===== */
.title {
  text-align: center;
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.subtitle {
  text-align: center;
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: 42px;
}

/* ===== FEATURES ===== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.feature {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 26px;
  transition: .25s ease;
  opacity: 0;
  transform: translateY(16px);
}

.feature.show {
  opacity: 1;
  transform: translateY(0);
}

.feature:hover {
  background: var(--hover);
  transform: translateY(-4px);
}

.feature-icon {
  width: 22px;
  height: 22px;
  margin-bottom: 14px;
  color: var(--icon);
  transition: color .25s ease;
}

.feature:hover .feature-icon {
  color: var(--text);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
}

.feature h3 {
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature p {
  font-size: .85rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ===== NOTE ===== */
.note {
  margin-top: 42px;
  text-align: center;
  font-size: .85rem;
  color: var(--muted);
}

body { user-select: none; }