/* ==========================================
   FinFormulas Style Sheet
   Elegant, professional finance design
   ========================================== */

/* --- Root Variables --- */
:root {
  --emerald: #2ecc71;
  --gold: #f1c40f;
  --dark-green: #145a32;
  --white: #ffffff;
  --gray: #f6f6f6;
  --text: #1c1c1c;
  --shadow: rgba(0, 0, 0, 0.05);
  --radius: 10px;
  --transition: 0.25s ease;
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
}

/* --- Global Reset --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  background: var(--white);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
}

img {
  max-width: 100%;
  display: block;
}

/* --- Layout Containers --- */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

.wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* --- Header --- */
.header {
  background: var(--emerald);
  color: var(--white);
  padding: 14px 0;
  box-shadow: 0 2px 5px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header .brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.2rem;
  text-decoration: none;
  color: var(--white);
}

.header .nav a {
  color: var(--white);
  text-decoration: none;
  margin-left: 25px;
  font-weight: 500;
  transition: color var(--transition);
}

.header .nav a:hover,
.header .nav a.active {
  color: var(--gold);
}

/* --- Hero Section --- */
.hero {
  background: linear-gradient(135deg, var(--emerald) 0%, var(--gold) 100%);
  color: var(--white);
  text-align: center;
  padding: 80px 20px;
  border-bottom: 4px solid var(--emerald);
}

.hero h1 {
  font-size: 2.4rem;
  margin-bottom: 12px;
  font-weight: 700;
}

.hero p {
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto 20px auto;
  line-height: 1.7;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  background: var(--emerald);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: 10px 22px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
}

.btn:hover {
  background: var(--gold);
  color: var(--dark-green);
}

.btn.primary {
  background: var(--white);
  color: var(--emerald);
  border: 2px solid var(--emerald);
}

.btn.primary:hover {
  background: var(--emerald);
  color: var(--white);
}

/* --- Sections --- */
.section {
  padding: 60px 0;
  background: var(--white);
}

.section-title {
  color: var(--dark-green);
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 30px;
  font-weight: 700;
}

.content-block {
  text-align: center;
  margin-bottom: 40px;
}

.content-block p {
  max-width: 700px;
  margin: 0 auto 20px;
  color: #333;
  line-height: 1.7;
}

/* --- Cards --- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.card {
  background: var(--gray);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px var(--shadow);
  padding: 25px;
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  color: var(--text);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 12px var(--shadow);
}

.card h4 {
  margin-top: 10px;
  font-weight: 600;
  color: var(--dark-green);
}

.card p {
  color: #444;
  font-size: 0.95rem;
}

/* --- Calculator Forms --- */
.calculator-section {
  padding: 50px 0;
  background: var(--gray);
}

.calculator-form {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: 0 3px 8px var(--shadow);
  padding: 30px;
  max-width: 600px;
  margin: 0 auto;
}

.form-row {
  display: flex;
  flex-direction: column;
  margin-bottom: 15px;
}

.form-row label {
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--dark-green);
}

.form-row input,
.form-row select {
  padding: 10px;
  border-radius: var(--radius);
  border: 1px solid #ccc;
  transition: border var(--transition);
}

.form-row input:focus,
.form-row select:focus {
  border: 1px solid var(--emerald);
  outline: none;
}

.unit-toggle {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
}

.result-box {
  margin-top: 20px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--gray);
  font-size: 1rem;
  text-align: center;
}

/* --- Footer --- */
.footer {
  background: var(--dark-green);
  color: var(--white);
  padding: 40px 20px;
  text-align: center;
  border-top: 5px solid var(--emerald);
}

.footer .footer-links a {
  color: var(--emerald);
  text-decoration: none;
  margin: 0 6px;
  font-weight: 500;
}

.footer .footer-links a:hover {
  text-decoration: underline;
}

.footer .disclaimer {
  max-width: 800px;
  margin: 20px auto;
  color: #ddd;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer small {
  display: block;
  margin-top: 25px;
  font-size: 0.85rem;
  opacity: 0.85;
}

.lang-block {
  margin-top: 20px;
}

/* --- Mobile --- */
.menu {
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.8rem;
  display: none;
}

@media (max-width: 768px) {
  .menu { display: block; }
  .nav { display: none; flex-direction: column; background: var(--emerald); width: 100%; }
  .nav.open { display: flex; }
  .nav a { padding: 12px; text-align: center; border-top: 1px solid rgba(255,255,255,0.15); }
}