/* =========================
   THEME VARIABLES
========================= */
:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #64ffda 0%, #00b4d8 100%);
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --card-bg: rgba(255, 255, 255, 0.06);
  --card-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #ffffff;
  --text-secondary: #b4b4b4;
  --text-tertiary: #8a8a8a;
  --accent-primary: #64ffda;
  --accent-secondary: #ff6b9d;
  --border-glass: rgba(255, 255, 255, 0.12);
  --shadow-glass: 0 12px 40px rgba(31, 38, 135, 0.45);
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.1);
  --border-radius: 16px;
  --border-radius-sm: 10px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light {
  --bg-primary: #f5f7fb;
  --bg-secondary: #ffffff;
  --card-bg: #ffffff;
  --card-glass: rgba(255, 255, 255, 0.9);
  --text-primary: #1a1a1a;
  --text-secondary: #555555;
  --text-tertiary: #777777;
  --border-glass: #e2e2e2;
  --shadow-glass: 0 8px 22px rgba(0, 0, 0, 0.1);
  --accent-primary: #007a63;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  animation: pageFade 0.7s ease;
  overflow-x: hidden;
}

/* =========================
   NAVBAR
========================= */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 15, 35, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-glass);
  transition: var(--transition);
}

body.light .header {
  background: rgba(245, 247, 251, 0.85);
}

.nav-container {
  max-width: 1200px;
  margin: auto;
  padding: 1.1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  gap: .6rem;
  align-items: center;
  font-weight: 700;
  font-size: 1.4rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  gap: 1.6rem;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
  padding: 0.5rem 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-primary);
}

.theme-toggle {
  cursor: pointer;
  font-size: 1.25rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--card-glass);
  border: 1px solid var(--border-glass);
  transition: var(--transition);
}

.theme-toggle:hover {
  transform: rotate(30deg);
  background: var(--accent-primary);
  color: var(--bg-primary);
}

/* =========================
   MAIN CONTENT
========================= */
.main-content {
  padding-top: 95px;
  padding-bottom: 3rem;
}

.hero-section {
  text-align: center;
  padding: 3.5rem 2rem 2rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(100, 255, 218, 0.05) 0%, transparent 70%);
  z-index: -1;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  display: inline-block;
}

.hero-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: var(--accent-primary);
  border-radius: 2px;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 1.5rem auto 0;
  line-height: 1.6;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 0 2rem;
}

/* =========================
   CONVERTER CARD
========================= */
.converter-card {
  background: var(--card-glass);
  border-radius: 24px;
  border: 1px solid var(--border-glass);
  padding: 2.5rem;
  box-shadow: var(--shadow-glass);
  animation: cardIn 0.6s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.converter-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(100, 255, 218, 0.03) 0%, transparent 70%);
  z-index: -1;
}

.converter-card h3 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
}

.converter-card h3 i {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.converter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.input-group {
  position: relative;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.converter-grid input {
  width: 100%;
  padding: 1.2rem 1rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-glass);
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 500;
  transition: var(--transition);
}

.converter-grid input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.25);
  transform: translateY(-2px);
}

.converter-grid input[disabled] {
  opacity: 0.7;
  cursor: not-allowed;
  background: rgba(0, 0, 0, 0.1);
}

body.light .converter-grid input[disabled] {
  background: rgba(0, 0, 0, 0.05);
}

/* =========================
   ENHANCED DROPDOWN
========================= */
.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: '\f078';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
  font-size: 0.9rem;
}

.converter-grid select {
  width: 100%;
  padding: 1.2rem 1rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-glass);
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 500;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  transition: var(--transition);
}

.converter-grid select:hover {
  border-color: var(--accent-primary);
}

.converter-grid select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.25);
}

.converter-grid select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 1rem;
}

/* =========================
   SWAP BUTTON
========================= */
.swap-container {
  display: flex;
  justify-content: center;
  margin: 1rem 0;
}

.swap-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--secondary-gradient);
  border: none;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(100, 255, 218, 0.3);
}

.swap-btn:hover {
  transform: rotate(180deg) scale(1.1);
  box-shadow: 0 6px 20px rgba(100, 255, 218, 0.5);
}

/* =========================
   CONVERT BUTTON
========================= */
.convert-btn {
  margin-top: 2rem;
  width: 100%;
  padding: 1.2rem;
  border: none;
  border-radius: var(--border-radius-sm);
  background: var(--primary-gradient);
  color: #fff;
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.convert-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: 0.5s;
}

.convert-btn:hover::before {
  left: 100%;
}

.convert-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(102, 126, 234, 0.45);
}

.convert-btn:active {
  transform: translateY(-1px);
}

/* =========================
   RESULT BOX
========================= */
.result-box {
  margin-top: 2.5rem;
  padding: 2rem;
  text-align: center;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-glass);
  animation: glowPulse 4s infinite alternate;
  position: relative;
  overflow: hidden;
}

.result-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--secondary-gradient);
}

.result-label {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.result-value {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-details {
  font-size: 1rem;
  color: var(--text-tertiary);
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-glass);
}

/* =========================
   CURRENCY FLAGS
========================= */
.currency-flag {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  margin-right: 0.5rem;
  vertical-align: middle;
}

/* =========================
   FOOTER
========================= */
.footer {
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border-glass);
  background: var(--bg-secondary);
  border-radius: 24px 24px 0 0;
}

.footer-container {
  max-width: 1200px;
  margin: auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
}

.footer-logo {
  display: flex;
  gap: .5rem;
  align-items: center;
  font-weight: 700;
  font-size: 1.4rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.footer-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 1rem;
}

.footer h4 {
  font-size: 1.2rem;
  margin-bottom: 1.2rem;
  color: var(--text-primary);
  position: relative;
  display: inline-block;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent-primary);
  border-radius: 2px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links a:hover {
  color: var(--accent-primary);
  transform: translateX(5px);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.social-link {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-glass);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--accent-primary);
  color: var(--bg-primary);
  transform: translateY(-5px);
}

.footer-bottom {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-glass);
  color: var(--text-tertiary);
  font-size: .9rem;
  letter-spacing: 0.5px;
}

/* =========================
   ANIMATIONS
========================= */
@keyframes pageFade {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

@keyframes cardIn {
  from { opacity: 0; transform: scale(0.96) translateY(20px); }
  to { opacity: 1; transform: none; }
}

@keyframes glowPulse {
  0% { box-shadow: 0 0 20px rgba(100, 255, 218, 0.1); }
  100% { box-shadow: 0 0 30px rgba(100, 255, 218, 0.2); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 768px) {
  .converter-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .converter-card {
    padding: 1.5rem;
  }
  
  .nav-container {
    padding: 1rem;
  }
  
  .nav-menu {
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .result-value {
    font-size: 2rem;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}
/* ============================= */
/* 🔵 Blue Cursor Trail Effect  */
/* ============================= */

.circle-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999999;
}

.cursor-circle {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #3b82f6;
  box-shadow:
    0 0 10px #3b82f6,
    0 0 20px rgba(59,130,246,0.8),
    0 0 35px rgba(59,130,246,0.6);
  transform: translate(-50%, -50%);
  mix-blend-mode: screen;
  will-change: transform;
}

.cursor-circle:first-child {
  width: 14px;
  height: 14px;
  background: #60a5fa;
  box-shadow:
    0 0 15px #60a5fa,
    0 0 35px rgba(96,165,250,0.9);
}

.cursor-clicking {
  transform: translate(-50%, -50%) scale(2.2) !important;
}

.cursor-hovering {
  transform: translate(-50%, -50%) scale(1.6);
}

/* Optional */
body {
  cursor: none;
}