@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --primary: #E63946;
  --primary-hover: #C1121F;
  --bg: #F8F9FA;
  --white: #FFFFFF;
  --text: #1D3557;
  --text-light: #6C757D;
  --border: #E0E0E0;
  --shadow: 0 10px 30px rgba(230, 57, 70, 0.08);
  --radius: 14px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 92%;
  max-width: 680px;
  margin: 2.5rem auto;
  padding: 2rem;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-top: 4px solid var(--primary);
}

@media (max-width: 768px) {
  .container { margin: 1.5rem 1rem; padding: 1.5rem; }
}

h2 {
  text-align: center;
  color: var(--primary);
  margin-bottom: 1.2rem;
  font-weight: 700;
  font-size: 1.75rem;
  letter-spacing: -0.5px;
}

.subtext {
  text-align: center;
  color: var(--text-light);
  margin-bottom: 1.8rem;
  font-size: 0.95rem;
}

label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
}

input, textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: var(--transition);
  background: #FCFCFC;
  margin-bottom: 1.2rem;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
  background: var(--white);
}

textarea { resize: vertical; min-height: 100px; }

button, .btn {
  display: block;
  width: 100%;
  padding: 1rem;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 0.5rem;
}

button:hover, .btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(230, 57, 70, 0.25);
}

.message {
  text-align: center;
  padding: 0.9rem;
  border-radius: 8px;
  margin-bottom: 1.2rem;
  font-weight: 500;
  font-size: 0.95rem;
}
.message.success { background: #E6F4EA; color: #1B5E20; }
.message.error { background: #FDECEA; color: #B71C1C; }

.nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  transition: var(--transition);
  background: rgba(230, 57, 70, 0.08);
  font-size: 0.95rem;
}

.nav a:hover {
  background: var(--primary);
  color: var(--white);
}

.chart-container {
  position: relative;
  height: 320px;
  margin: 1.5rem 0;
  padding: 1rem;
  background: #FAFAFA;
  border-radius: 10px;
  border: 1px solid var(--border);
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-light);
  font-size: 0.85rem;
  margin-top: auto;
  background: var(--white);
  border-top: 1px solid var(--border);
}

@media (max-width: 480px) {
  h2 { font-size: 1.4rem; }
  input, textarea, button { font-size: 0.95rem; padding: 0.8rem; }
  .chart-container { height: 260px; }
}