/* css/components.css — nav, buttons, cards, chips, table, accordion, footer */

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
}
.nav-logo {
  font-weight: 800;
  color: var(--color-heading);
  font-size: 18px;
}
.nav-logo span { color: var(--color-accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--color-body);
  font-weight: 600;
  font-size: 14px;
}
.nav-links a:hover { color: var(--color-accent); }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-heading);
  margin: 4px 0;
}

@media (max-width: 1024px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: var(--space-3) var(--space-4);
    width: 100%;
    border-top: 1px solid var(--color-border);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-hover); color: #fff; }
.btn-secondary {
  background: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.btn-secondary:hover { background: var(--color-accent-light); }
.btn-outline-light {
  background: transparent;
  border-color: rgba(248, 250, 252, 0.4);
  color: var(--color-contrast-text);
}
.btn-outline-light:hover { background: rgba(248, 250, 252, 0.1); }

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}
.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}
.card-icon svg { width: 22px; height: 22px; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
}
.card h3 { margin-bottom: var(--space-2); }
.card p { color: var(--color-muted); font-size: 14px; margin-bottom: var(--space-2); }

/* Chips */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}
.chip {
  background: var(--color-accent-light);
  color: var(--color-accent-light-text);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
}
.section-alt .chip {
  background: rgba(99, 102, 241, 0.25);
  color: #E0E7FF;
}

/* Table */
.table-responsive table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.table-responsive th, .table-responsive td {
  text-align: left;
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}
.table-responsive th {
  background: var(--color-accent-light);
  color: var(--color-accent-light-text);
}
.table-responsive tr:last-child td { border-bottom: none; }

.section-alt .table-responsive table {
  color: var(--color-body);
}
.section-alt .table-responsive th {
  color: var(--color-accent-light-text);
}

@media (max-width: 640px) {
  .table-responsive thead { display: none; }
  .table-responsive table, .table-responsive tbody, .table-responsive tr, .table-responsive td {
    display: block;
    width: 100%;
  }
  .table-responsive tr {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) 0;
  }
  .table-responsive td {
    border: none;
    padding: 4px var(--space-3);
  }
  .table-responsive td::before {
    content: attr(data-label);
    display: block;
    font-weight: 700;
    color: var(--color-heading);
    font-size: 12px;
    text-transform: uppercase;
    margin-bottom: 2px;
  }
}

/* Accordion */
.accordion-toggle {
  background: none;
  border: none;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.accordion-toggle svg {
  width: 14px;
  height: 14px;
  transition: transform 0.15s ease;
}
.accordion-toggle.open > svg { transform: rotate(90deg); }
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease;
}
.accordion-body.open { max-height: 600px; }
.accordion-body ul {
  margin: var(--space-2) 0 0 0;
  padding-left: var(--space-4);
  font-size: 13px;
  color: var(--color-muted);
}
.accordion-body li { margin-bottom: 4px; }

/* Stepper (Product Lifecycle) */
.stepper {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding-bottom: var(--space-2);
}
.stepper-step {
  flex: 1 0 160px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}
.stepper-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  margin-bottom: var(--space-2);
}

.section-alt .stepper-step {
  color: var(--color-body);
}
.section-alt .stepper-step h3 {
  color: var(--color-heading);
}

@media (max-width: 640px) {
  .stepper { flex-direction: column; overflow-x: visible; }
  .stepper-step { flex: none; }
}

/* Footer */
.footer {
  background: var(--color-contrast-bg);
  color: var(--color-contrast-muted);
  padding: var(--space-6) 0 var(--space-4);
}
.footer h3 { color: var(--color-contrast-text); }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-links li { margin-bottom: var(--space-2); }
.footer-links a { color: var(--color-contrast-muted); font-size: 14px; }
.footer-links a:hover { color: var(--color-contrast-text); }
.footer-bottom {
  border-top: 1px solid rgba(248, 250, 252, 0.12);
  padding-top: var(--space-4);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 13px;
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}

/* Form (contact.html) */
.form-field {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-heading);
}
.form-field span { display: block; margin-bottom: 4px; }
.form-field input, .form-field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-body);
  background: var(--color-bg);
  font-weight: 400;
}
.form-field input:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.form-field.invalid input, .form-field.invalid textarea {
  border-color: #DC2626;
}