/* ===== RESET ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f8fafc;
  color: #0f172a;
  line-height: 1.6;
}

/* ===== HEADER ===== */
.header {
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}

.header-inner {
  max-width: 900px;
  margin: auto;
}

.nav {
  margin-top: 20px;
}

.nav a {
  color: #e0e7ff;
  text-decoration: none;
  margin: 0 12px;
  font-weight: 600;
}

.nav a.active {
  text-decoration: underline;
}

/* ===== HERO ===== */
.hero {
  max-width: 900px;
  margin: 50px auto;
  text-align: center;
  padding: 0 20px;
}

/* ===== TOOL ===== */
.tool {
  max-width: 1100px;
  margin: auto;
  padding: 20px;
}

.input-card {
  background: #fff;
  padding: 25px;
  border-radius: 10px;
  display: flex;
  gap: 10px;
  box-shadow: 0 10px 25px rgba(0,0,0,.08);
}

.input-card input {
  flex: 1;
  padding: 14px;
  border-radius: 6px;
  border: 1px solid #cbd5f5;
}

.input-card button {
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 14px 22px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.input-card button:hover {
  background: #1d4ed8;
}

/* ===== SUMMARY ===== */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
  gap: 15px;
  margin: 30px 0;
}

.card {
  background: #fff;
  padding: 18px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 6px 18px rgba(0,0,0,.06);
}

/* ===== TABLE ===== */
table {
  width: 100%;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  margin-top: 20px;
}

th, td {
  padding: 14px;
  border-bottom: 1px solid #e5e7eb;
}

th {
  background: #f1f5f9;
  cursor: pointer;
}

/* ===== FEATURES ===== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px,1fr));
  gap: 20px;
  max-width: 1100px;
  margin: 60px auto;
  padding: 0 20px;
}

.feature {
  background: #fff;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(0,0,0,.08);
}

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  padding: 25px;
  background: #0f172a;
  color: #c7d2fe;
}

/* ===== ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(10px);
  transition: .6s ease;
}

.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: .7s ease;
}

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

.animate-text {
  animation: textSlide 1s ease forwards;
}

@keyframes textSlide {
  from { opacity: 0; transform: translateY(25px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== UTIL ===== */
.hidden { display: none; }