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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #f8fafc;
  --white: #ffffff;
  --border: #e5e7eb;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; width: 100%; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Header ===== */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.logo span { color: var(--primary); }
.logo:hover { text-decoration: none; }
.main-nav { display: flex; gap: 22px; }
.main-nav a {
  color: var(--text-light);
  font-weight: 500;
  font-size: .92rem;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: all .2s;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  text-decoration: none;
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 50px 20px 30px;
}
.hero h1 {
  font-size: 2.2rem;
  margin-bottom: 14px;
  color: var(--text);
}
.hero p {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 720px;
  margin: 0 auto;
}

.badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
  margin-bottom: 14px;
}

/* ===== Tool Grid (homepage) ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin: 30px 0 40px;
}
.tool-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: all .25s;
  border: 1px solid var(--border);
  display: block;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  text-decoration: none;
}
.tool-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}
.tool-card h3 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}
.tool-card p {
  font-size: .88rem;
  color: var(--text-light);
}

/* ===== Tool Page ===== */
.tool-page {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  margin: 30px 0;
}
.tool-page h1 {
  font-size: 1.7rem;
  margin-bottom: 8px;
}
.tool-desc {
  color: var(--text-light);
  margin-bottom: 24px;
  font-size: .95rem;
}

textarea, input[type="text"], input[type="number"], input[type="password"], input[type="email"], select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  font-family: inherit;
  color: var(--text);
  background: #fcfcfd;
  transition: border-color .2s;
}
textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
textarea { resize: vertical; }

label { font-weight: 500; font-size: .9rem; }

.result-box {
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  font-family: "SF Mono", Monaco, Consolas, monospace;
  font-size: .9rem;
  word-break: break-all;
  min-height: 50px;
}

.field-group { margin-bottom: 18px; }
.field-group > label { display: block; margin-bottom: 6px; }

.options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 14px 0;
}
.options-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .9rem;
  cursor: pointer;
  font-weight: 400;
}
.options-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

/* ===== Buttons ===== */
.btn-row { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.btn {
  padding: 10px 22px;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .2s;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #e2e8f0; color: var(--text); }
.btn-secondary:hover { background: #cbd5e1; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; }

/* ===== Password Strength ===== */
.strength-meter {
  height: 8px;
  border-radius: 4px;
  background: #e5e7eb;
  overflow: hidden;
  margin: 12px 0;
}
.strength-bar {
  height: 100%;
  border-radius: 4px;
  transition: all .3s;
  width: 0;
}
.strength-label { font-weight: 600; font-size: .9rem; }
.strength-weak { background: var(--danger); }
.strength-fair { background: var(--warning); }
.strength-good { background: #3b82f6; }
.strength-strong { background: var(--success); }

/* ===== Password Display ===== */
.password-display {
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  font-family: "SF Mono", Monaco, Consolas, monospace;
  font-size: 1.1rem;
  word-break: break-all;
  letter-spacing: 1px;
  min-height: 54px;
  display: flex;
  align-items: center;
}

/* ===== Info Section ===== */
.info-section {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}
.info-section h2 { margin-bottom: 12px; font-size: 1.3rem; }
.info-section h3 { margin: 18px 0 8px; font-size: 1.05rem; }
.info-section p { margin-bottom: 12px; color: var(--text-light); }
.info-section ul { margin: 0 0 14px 22px; color: var(--text-light); }
.info-section ul li { margin-bottom: 6px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-top: 20px;
}
.feature {
  background: var(--bg);
  padding: 18px;
  border-radius: var(--radius);
}
.feature h3 { margin-bottom: 6px; font-size: 1rem; }
.feature p { margin: 0; font-size: .88rem; }

/* ===== Content pages ===== */
.content-page {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  margin: 30px 0 40px;
}
.content-page h1 { margin-bottom: 20px; font-size: 1.8rem; }
.content-page h2 { margin: 24px 0 10px; font-size: 1.2rem; }
.content-page p { margin-bottom: 14px; color: var(--text-light); }
.content-page ul { margin: 0 0 14px 22px; color: var(--text-light); }
.content-page ul li { margin-bottom: 6px; }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 500px;
  margin-top: 20px;
}

/* ===== Footer ===== */
.site-footer {
  background: #1e293b;
  color: #cbd5e1;
  margin-top: auto;
}
.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 30px;
  padding: 40px 20px;
}
.footer-col h4 { color: #fff; margin-bottom: 12px; font-size: 1rem; }
.footer-col p, .footer-col a { color: #94a3b8; font-size: .88rem; display: block; margin-bottom: 6px; }
.footer-col a:hover { color: #fff; text-decoration: none; }
.copyright {
  border-top: 1px solid #334155;
  padding: 16px 20px;
  font-size: .85rem;
  text-align: center;
  color: #64748b;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #1e293b;
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: .9rem;
  opacity: 0;
  transition: all .3s;
  z-index: 999;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    gap: 14px;
  }
  .main-nav.open { display: flex; }
  .hero h1 { font-size: 1.6rem; }
  .tool-page, .info-section, .content-page { padding: 20px; }
}