/* 🌈 Base Styling */
:root {
  --bg: #f8f9fb;
  --card-bg: #fff;
  --text: #222;
  --muted: #666;
  --accent: #007bff;
  --border: #e2e6ea;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(0,0,0,0.08);
}

body {
  font-family: "Inter", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 20px;
}

/* 🧱 Wrapper */
.wrapper {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

/* 🧩 Header */
header {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--card-bg);
  padding: 20px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.logo {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1.5rem;
  border-radius: 50%;
  width: 55px;
  height: 55px;
  display: flex;
  align-items: center;
  justify-content: center;
}

header h1 {
  font-size: 1.6rem;
  margin: 0;
}

header .lead {
  color: var(--muted);
  margin-top: 4px;
  font-size: 0.95rem;
}

/* 🔢 Grid Layout */
.grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
}

/* 🪶 Card */
.card {
  background: var(--card-bg);
  padding: 20px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* 📅 Inputs & Labels */
label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

input, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  transition: 0.2s;
  background: #fff;
}

input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0,123,255,0.2);
}

/* 🧮 Buttons */
.actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s;
}

.btn:hover {
  background: #0064d2;
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

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

/* ⚠️ Error */
.error {
  margin-top: 10px;
  color: #d93025;
  background: #fdecea;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
}

/* 📊 Result Area */
.result {
  margin-top: 20px;
  background: #f9fbff;
  padding: 14px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.result .muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.result .big {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 4px;
}

.result .small {
  font-size: 0.9rem;
  color: var(--muted);
}

/* 💡 Tips Panel */
.panel-right .chip {
  background: var(--accent);
  color: #fff;
  border-radius: 20px;
  font-size: 0.75rem;
  padding: 2px 10px;
}

.panel-right strong {
  font-size: 1rem;
}

.panel-right ul {
  margin-top: 10px;
  padding-left: 18px;
}

.panel-right li {
  margin-bottom: 6px;
}

.panel-right .small {
  font-size: 0.85rem;
  color: var(--muted);
}

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

/* 📱 Responsive */
@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }

  header {
    flex-direction: column;
    text-align: center;
  }

  .logo {
    width: 60px;
    height: 60px;
  }
}

@media (max-width: 600px) {
  body {
    padding: 14px;
  }

  header, .card {
    padding: 16px;
  }

  .btn {
    flex: 1 1 100%;
  }
}