:root {
  color-scheme: dark;
  --bg-color: #0a0f2c;
  --bg-secondary: #111739;
  --card-bg: rgba(17, 23, 57, 0.9);
  --accent: #35e7ff;
  --accent-secondary: #7a5cff;
  --text-primary: #f3f6ff;
  --text-secondary: #c2c8ff;
  --border-color: rgba(122, 92, 255, 0.3);
  --shadow-color: rgba(53, 231, 255, 0.2);
  --success: #37f59c;
  --warning: #ffb347;
  --danger: #ff6b91;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(circle at top, #1a214f, var(--bg-color));
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(#ffffff 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.1;
  animation: float-stars 20s linear infinite;
  pointer-events: none;
  z-index: 0;
}

body::after {
  background-size: 180px 180px;
  opacity: 0.06;
  animation-duration: 28s;
}

@keyframes float-stars {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-120px);
  }
}

main,
header,
footer {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  padding: 32px 0 12px;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.2rem;
}

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

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--accent);
}

.hero {
  padding: 72px 0 40px;
  text-align: left;
}

.hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  margin-bottom: 16px;
}

.hero p {
  color: var(--text-secondary);
  max-width: 620px;
  line-height: 1.6;
}

.glow {
  color: var(--accent);
  text-shadow: 0 0 16px rgba(53, 231, 255, 0.5);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
  margin: 36px 0 80px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 20px 40px rgba(9, 12, 30, 0.6);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(12px);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 25px 45px rgba(53, 231, 255, 0.2);
}

.card h3 {
  margin-top: 0;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: linear-gradient(130deg, var(--accent), var(--accent-secondary));
  color: #08111f;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button.secondary {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 18px rgba(53, 231, 255, 0.35);
}

.section-title {
  font-size: 1.7rem;
  margin-bottom: 14px;
}

.tool-layout {
  display: grid;
  grid-template-columns: minmax(250px, 320px) 1fr;
  gap: 32px;
  align-items: start;
  padding-bottom: 80px;
}

.tool-panel {
  background: var(--card-bg);
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.tool-panel label {
  display: block;
  margin: 16px 0 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.tool-panel input,
.tool-panel select,
.tool-panel textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(122, 92, 255, 0.4);
  background: rgba(10, 15, 44, 0.6);
  color: var(--text-primary);
}

.tool-panel textarea {
  min-height: 150px;
  resize: vertical;
}

.tool-panel .checkbox-group {
  display: grid;
  gap: 10px;
}

.status {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.output-box {
  padding: 20px;
  background: rgba(9, 12, 30, 0.7);
  border-radius: 14px;
  border: 1px dashed rgba(53, 231, 255, 0.4);
  min-height: 140px;
  white-space: pre-wrap;
  word-break: break-word;
}

.strength {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.strength span {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
}

.strength span.active {
  background: var(--success);
  box-shadow: 0 0 10px rgba(55, 245, 156, 0.5);
}

.notice {
  padding: 20px;
  border-radius: 16px;
  background: rgba(17, 23, 57, 0.7);
  border: 1px solid rgba(53, 231, 255, 0.2);
  margin-bottom: 24px;
}

.footer {
  padding: 32px 0 40px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .tool-layout {
    grid-template-columns: 1fr;
  }

  .nav-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}