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

:root {
  --bg: #0d0f1a;
  --bg2: #131629;
  --bg3: #1a1e35;
  --card: #1e2340;
  --border: #2a3060;
  --accent: #5b8dee;
  --accent2: #a78bfa;
  --accent3: #34d399;
  --text: #e8eaf6;
  --text2: #9ba3c9;
  --text3: #6b7399;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent2);
}

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

button {
  cursor: pointer;
  font-family: var(--font);
}

input,
select,
textarea {
  font-family: var(--font);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-sm {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

nav {
  background: rgba(13, 15, 26, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.3px;
}

.logo-text span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  color: var(--text2);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-links a:hover {
  color: var(--text);
  background: var(--bg3);
}

.nav-links a.active {
  color: var(--accent);
  background: rgba(91, 141, 238, 0.1);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 22px;
  padding: 4px;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  height: 100vh;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 12px 0;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  color: var(--text2);
  font-size: 15px;
  padding: 10px 24px;
  transition: all var(--transition);
}

.nav-mobile a:hover {
  color: var(--text);
  background: var(--bg3);
}

footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.footer-inner {
  padding: 48px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 14px;
}

.footer-brand p {
  color: var(--text3);
  font-size: 14px;
  line-height: 1.7;
  max-width: 280px;
}

.footer-col h4 {
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  color: var(--text3);
  font-size: 14px;
  transition: color var(--transition);
}

.footer-col ul a:hover {
  color: var(--text);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: var(--text3);
  font-size: 13px;
}

.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--accent2);
  transform: translateY(-2px);
}

.page-hero {
  padding: 56px 0 40px;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.page-hero p {
  color: var(--text2);
  font-size: 17px;
  max-width: 560px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(91, 141, 238, 0.12);
  color: var(--accent);
  border: 1px solid rgba(91, 141, 238, 0.25);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  border: none;
  transition: all var(--transition);
  cursor: pointer;
}

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

.btn-primary:hover {
  background: #4a7de0;
  color: var(--white);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--card);
  color: var(--white);
}

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

.btn-outline:hover {
  background: rgba(91, 141, 238, 0.1);
  color: var(--accent);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.tool-link-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.tool-link-bar a {
  font-size: 13px;
  color: var(--text2);
  display: flex;
  align-items: center;
  gap: 6px;
}

.tool-link-bar a:hover {
  color: var(--accent);
}

.result-box {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-top: 20px;
}

.result-box h3 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text3);
  margin-bottom: 12px;
}

.result-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.result-sub {
  font-size: 14px;
  color: var(--text2);
  margin-top: 6px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
select,
textarea {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 10px 14px;
  font-size: 15px;
  transition: border-color var(--transition);
  outline: none;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.form-group {
  margin-bottom: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 32px 0;
}

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

  .nav-toggle {
    display: flex;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
}