/* ============================================
   UltraSafe Data — Corporate Site Styles
   ============================================ */

:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-input: #1c2129;
  --green: #4caf50;
  --green-light: #81c784;
  --green-pale: #c8e6c9;
  --green-dark: #2e7d32;
  --white: #ffffff;
  --text: #e0e0e0;
  --text-muted: #9e9e9e;
  --border: #2a3040;
  --radius: 8px;
  --max-width: 1100px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--green-light); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--green-pale); }

/* ---- Nav ---- */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(22, 27, 34, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.3px;
}
.nav-brand:hover { color: var(--green-light); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 22px;
  cursor: pointer;
  padding: 8px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--white); }

/* ---- Hero ---- */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  background: radial-gradient(ellipse at 50% 30%, rgba(46, 125, 50, 0.08) 0%, transparent 70%);
}

#hero h1 {
  font-size: 56px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: 22px;
  color: var(--green-light);
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s, transform 0.1s;
}
.btn:active { transform: scale(0.98); }

.btn-primary {
  background-color: var(--green-dark);
  color: var(--white);
}
.btn-primary:hover { background-color: var(--green); color: var(--white); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---- Sections ---- */
section { padding: 96px 0; }

section:nth-child(even) {
  background-color: var(--bg-card);
}

section h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 32px;
}

.section-icon {
  color: var(--green);
  margin-right: 10px;
  font-size: 28px;
}

section p {
  font-size: 16px;
  color: var(--text);
  max-width: 800px;
  line-height: 1.8;
  margin-bottom: 16px;
}

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.card {
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.2s;
}

section:nth-child(even) .card {
  background-color: var(--bg-card);
  border-color: var(--border);
}
section:nth-child(odd) .card {
  background-color: var(--bg-card);
}

.card:hover { border-color: var(--green-dark); }

.card-icon {
  font-size: 28px;
  color: var(--green);
  margin-bottom: 16px;
}

.card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.card-note {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
}

.card p {
  font-size: 15px;
  color: var(--text);
  max-width: none;
  margin-bottom: 12px;
}

.card-compact { padding: 24px; }

.card-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--green-light);
  margin-top: 8px;
}
.card-link i { margin-left: 4px; font-size: 12px; }

/* ---- Contact Form ---- */
.contact-intro {
  color: var(--text-muted);
  margin-bottom: 32px;
}

#contact-form {
  max-width: 700px;
}

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

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

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.required { color: var(--green); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--green);
}

.form-group input.field-error,
.form-group select.field-error,
.form-group textarea.field-error {
  border-color: #ef5350;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239e9e9e' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.captcha-group {
  margin: 24px 0;
}

.form-error {
  display: none;
  color: #ef5350;
  font-size: 14px;
  padding: 12px 16px;
  background-color: rgba(239, 83, 80, 0.1);
  border: 1px solid rgba(239, 83, 80, 0.3);
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.form-success {
  display: none;
  color: var(--green-light);
  font-size: 15px;
  padding: 20px 24px;
  background-color: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  border-radius: var(--radius);
  margin-bottom: 16px;
  line-height: 1.6;
}

.btn-submit {
  width: 100%;
  max-width: 260px;
  text-align: center;
}

.btn-submit i { margin-right: 6px; }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 48px;
  text-align: center;
  position: relative;
  max-width: 400px;
  width: 90%;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}
.modal-close:hover { color: var(--white); }

.modal-icon {
  font-size: 48px;
  color: var(--green);
  margin-bottom: 16px;
}

.modal-box h3 {
  font-size: 22px;
  color: var(--white);
  margin-bottom: 8px;
}

.modal-box p {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 24px;
  max-width: none;
}

.modal-ok {
  min-width: 120px;
}

/* ---- Footer ---- */
#footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 13px;
}
.footer-links a:hover { color: var(--white); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: rgba(22, 27, 34, 0.98);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

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

  #hero h1 { font-size: 36px; }
  .hero-tagline { font-size: 18px; }
  .hero-sub { font-size: 15px; }

  section { padding: 64px 0; }
  section h2 { font-size: 26px; }

  .card-grid { grid-template-columns: 1fr; }

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

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  #hero h1 { font-size: 28px; }
  .hero-tagline { font-size: 16px; }
  .container { padding: 0 16px; }
  .card { padding: 20px; }
}