/* CSS Custom Properties for Light & Dark Themes */
:root {
  /* HSL Colors - Light Mode */
  --bg-color: hsl(210, 40%, 98%);
  --bg-secondary: hsl(0, 0%, 100%);
  --text-main: hsl(220, 20%, 20%);
  --text-muted: hsl(220, 15%, 45%);
  --border-color: hsl(214, 25%, 90%);
  --primary-color: hsl(228, 70%, 55%);
  --primary-hover: hsl(228, 70%, 45%);
  
  --card-bg: hsl(0, 0%, 100%);
  --card-hover-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
  
  /* Icon Background Colors */
  --color-blue: hsl(210, 100%, 92%);
  --color-blue-text: hsl(210, 100%, 40%);
  --color-green: hsl(150, 100%, 92%);
  --color-green-text: hsl(150, 100%, 25%);
  --color-orange: hsl(30, 100%, 92%);
  --color-orange-text: hsl(30, 100%, 40%);
  --color-purple: hsl(270, 100%, 92%);
  --color-purple-text: hsl(270, 100%, 40%);
  --color-yellow: hsl(50, 100%, 92%);
  --color-yellow-text: hsl(50, 100%, 30%);
  --color-red: hsl(0, 100%, 92%);
  --color-red-text: hsl(0, 100%, 45%);
  --color-teal: hsl(180, 100%, 92%);
  --color-teal-text: hsl(180, 100%, 30%);
  --color-pink: hsl(330, 100%, 92%);
  --color-pink-text: hsl(330, 100%, 45%);
  --color-indigo: hsl(240, 100%, 92%);
  --color-indigo-text: hsl(240, 100%, 50%);

  /* Typography */
  --font-family: 'Inter', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-theme="dark"] {
  /* HSL Colors - Dark Mode */
  --bg-color: hsl(222, 47%, 11%);
  --bg-secondary: hsl(222, 47%, 15%);
  --text-main: hsl(210, 40%, 98%);
  --text-muted: hsl(215, 20%, 65%);
  --border-color: hsl(216, 34%, 17%);
  --primary-color: hsl(228, 80%, 65%);
  --primary-hover: hsl(228, 80%, 75%);
  
  --card-bg: hsl(222, 47%, 15%);
  --card-hover-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);

  /* Icon Background Colors */
  --color-blue: hsl(210, 100%, 20%);
  --color-blue-text: hsl(210, 100%, 75%);
  --color-green: hsl(150, 100%, 15%);
  --color-green-text: hsl(150, 100%, 60%);
  --color-orange: hsl(30, 100%, 20%);
  --color-orange-text: hsl(30, 100%, 65%);
  --color-purple: hsl(270, 100%, 25%);
  --color-purple-text: hsl(270, 100%, 75%);
  --color-yellow: hsl(50, 100%, 20%);
  --color-yellow-text: hsl(50, 100%, 60%);
  --color-red: hsl(0, 100%, 20%);
  --color-red-text: hsl(0, 100%, 70%);
  --color-teal: hsl(180, 100%, 15%);
  --color-teal-text: hsl(180, 100%, 60%);
  --color-pink: hsl(330, 100%, 20%);
  --color-pink-text: hsl(330, 100%, 70%);
  --color-indigo: hsl(240, 100%, 25%);
  --color-indigo-text: hsl(240, 100%, 75%);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}

ul {
  list-style: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography Utilities */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-main);
  text-align: center;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(var(--bg-secondary), 0.8) /* We need to use background from vars but with opacity. So: */;
  background-color: var(--bg-secondary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border-bottom: 1px solid var(--border-color);
}
[data-theme="dark"] .header {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav {
  display: none;
}
@media (min-width: 768px) {
  .nav {
    display: block;
  }
}

.nav-list {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-weight: 500;
  color: var(--text-muted);
}
.nav-link:hover, .nav-link.active {
  color: var(--primary-color);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1.25rem;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.icon-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.mobile-menu-btn {
  display: flex;
}
@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Nav */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  max-width: 100%;
  height: 100vh;
  background-color: var(--bg-secondary);
  z-index: 100;
  box-shadow: -5px 0 25px rgba(0,0,0,0.1);
  transition: right 0.3s ease;
  padding: 24px;
}
.mobile-nav.open {
  right: 0;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  display: block;
  font-size: 1.1rem;
  font-weight: 500;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}
.mobile-nav-link:hover {
  background-color: var(--border-color);
  color: var(--primary-color);
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-bg-shapes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
}
[data-theme="dark"] .shape {
  opacity: 0.15;
}

.shape-1 {
  top: -10%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: var(--primary-color);
}
.shape-2 {
  bottom: -20%;
  right: -5%;
  width: 500px;
  height: 500px;
  background: var(--color-purple);
}

.hero-container {
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}
@media (min-width: 768px) {
  .hero-title {
    font-size: 3.5rem;
  }
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}
@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.25rem;
  }
}

.search-container {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.2rem;
}

.search-input {
  width: 100%;
  padding: 18px 24px 18px 56px;
  font-size: 1.1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  color: var(--text-main);
  outline: none;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
[data-theme="dark"] .search-input {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(100, 108, 255, 0.2);
}

/* Calculator Grid */
.main-content {
  flex: 1;
  padding: 40px 24px 80px;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.calc-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  will-change: transform, box-shadow;
}

.calc-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.calc-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-hover-shadow);
  border-color: transparent;
}
.calc-card:hover::after {
  transform: scaleX(1);
}

.calc-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

/* Base Icon Colors */
.bg-blue { background-color: var(--color-blue); color: var(--color-blue-text); }
.bg-green { background-color: var(--color-green); color: var(--color-green-text); }
.bg-orange { background-color: var(--color-orange); color: var(--color-orange-text); }
.bg-purple { background-color: var(--color-purple); color: var(--color-purple-text); }
.bg-yellow { background-color: var(--color-yellow); color: var(--color-yellow-text); }
.bg-red { background-color: var(--color-red); color: var(--color-red-text); }
.bg-teal { background-color: var(--color-teal); color: var(--color-teal-text); }
.bg-pink { background-color: var(--color-pink); color: var(--color-pink-text); }
.bg-indigo { background-color: var(--color-indigo); color: var(--color-indigo-text); }


.calc-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.calc-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.no-results {
  text-align: center;
  padding: 60px 0;
}
.no-results.hidden {
  display: none;
}
.no-results-icon {
  font-size: 3rem;
  color: var(--border-color);
  margin-bottom: 16px;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 20px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-desc {
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 400px;
}

.footer-links-group h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.footer-links a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Calculator Wrapper Page Styles (for specific calculator pages) */
.calc-page-wrapper {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 24px;
}

.calc-header {
  text-align: center;
  margin-bottom: 40px;
}

.calc-page-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: inline-block;
  padding: 16px;
  border-radius: var(--radius-md);
}

.calc-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.calc-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.calc-container {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.03);
}
[data-theme="dark"] .calc-container {
  box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-main);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-color);
  color: var(--text-main);
  transition: var(--transition);
  font-family: var(--font-family);
}
.form-input:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(100, 108, 255, 0.15);
}

.btn {
  display: inline-block;
  width: 100%;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  color: #fff;
  background-color: var(--primary-color);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}
.btn:hover {
  background-color: var(--primary-hover);
}

.calc-result {
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  display: none; /* hidden by default */
}
.calc-result.show {
  display: block;
}

.result-box {
  background-color: var(--bg-color);
  padding: 24px;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--border-color);
}
.result-box h3 {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.result-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* Page content forms specific to footers */
.page-content {
  max-width: 800px;
  margin: 40px auto 80px;
  padding: 0 24px;
}

.page-content h1 {
  font-size: 2.5rem;
  margin-bottom: 24px;
}

.page-content h2 {
  font-size: 1.5rem;
  margin-top: 32px;
  margin-bottom: 16px;
}

.page-content p {
  margin-bottom: 16px;
  color: var(--text-muted);
}