/* ===== SST CALCULATOR — Dark Theme Styles ===== */

/* Force dark theme on calculator page */
:root {
  --calc-bg: #0f1923;
  --calc-surface: #1a2736;
  --calc-surface-2: #223344;
  --calc-border: #2d3f52;
  --calc-text: #e2e8f0;
  --calc-muted: #94a3b8;
  --calc-primary: #003b71;
  --calc-primary-light: #0a5ba8;
  --calc-accent: #ffb000;
  --calc-accent-hover: #ff9500;
  --calc-success: #22c55e;
  --calc-error: #ef4444;
  --calc-glow: rgba(0, 59, 113, 0.4);
  --calc-radius: 16px;
  --calc-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Override body for dark */
body {
  background: var(--calc-bg) !important;
  color: var(--calc-text) !important;
}

/* Main */
.calc-main {
  min-height: 100vh;
  padding-top: 20px;
  padding-bottom: 80px;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--calc-muted);
}
.breadcrumbs a {
  color: var(--calc-muted);
  transition: color var(--calc-transition);
}
.breadcrumbs a:hover { color: var(--calc-accent); }
.breadcrumbs span { margin: 0 6px; }
.breadcrumbs .current { color: var(--calc-text); }

/* Hero */
.calc-hero {
  text-align: center;
  padding: 40px 0 30px;
}
.calc-hero__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.calc-hero__subtitle {
  font-size: 1.1rem;
  color: var(--calc-muted);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

/* Steps indicator */
.calc-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 20px;
}
.calc-step {
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0.5;
  transition: opacity var(--calc-transition);
}
.calc-step.active { opacity: 1; }
.calc-step__num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--calc-surface-2);
  border: 2px solid var(--calc-border);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--calc-muted);
  transition: all var(--calc-transition);
}
.calc-step.active .calc-step__num {
  background: var(--calc-primary);
  border-color: var(--calc-primary-light);
  color: #fff;
  box-shadow: 0 0 20px var(--calc-glow);
}
.calc-step.completed .calc-step__num {
  background: var(--calc-success);
  border-color: var(--calc-success);
  color: #fff;
}
.calc-step__label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--calc-muted);
}
.calc-step.active .calc-step__label { color: #fff; }
.calc-step__line {
  width: 60px;
  height: 2px;
  background: var(--calc-border);
  margin: 0 16px;
  transition: background var(--calc-transition);
}
.calc-step__line.active { background: var(--calc-primary-light); }

/* Section */
.calc-section {
  padding: 20px 0 40px;
  animation: fadeInUp 0.5s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Card */
.calc-card {
  background: var(--calc-surface);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
  padding: 40px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transition: border-color var(--calc-transition);
}
.calc-card:hover {
  border-color: rgba(0, 59, 113, 0.4);
}
.calc-card__header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--calc-border);
}
.calc-card__icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--calc-primary) 0%, var(--calc-primary-light) 100%);
  display: grid;
  place-items: center;
  color: #fff;
  flex-shrink: 0;
}
.calc-card__title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.calc-card__desc {
  font-size: 0.9rem;
  color: var(--calc-muted);
}

/* Form */
.calc-form__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
}
.form-group input,
.form-group select,
.form-group textarea {
  background: #223344;
  border: 1px solid #3d5166;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 1rem;
  color: #e2e8f0;
  font-family: inherit;
  transition: all var(--calc-transition);
  outline: none;
  width: 100%;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--calc-muted);
  opacity: 0.6;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--calc-primary-light);
  box-shadow: 0 0 0 3px var(--calc-glow);
  background: rgba(10, 91, 168, 0.08);
}
.form-group input.error,
.form-group select.error {
  border-color: var(--calc-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}
.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpolyline points='2 4 6 8 10 4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.form-hint {
  font-size: 0.75rem;
  color: var(--calc-muted);
  opacity: 0.7;
}
.form-error {
  font-size: 0.75rem;
  color: var(--calc-error);
  min-height: 16px;
}

/* Select with search */
.select-search-wrap {
  position: relative;
}
.select-search {
  width: 100%;
}
.select-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  max-height: 220px;
  overflow-y: auto;
  z-index: 100;
  display: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}
.select-dropdown.open { display: block; }
.select-dropdown__item {
  padding: 10px 16px;
  cursor: pointer;
  font-size: 0.9rem;
  color: #1f2937;
  transition: background var(--calc-transition);
}
.select-dropdown__item:hover,
.select-dropdown__item.highlighted {
  background: #f0f4f8;
}
.select-dropdown__item.selected {
  background: #003b71;
  color: #fff;
}

/* Buttons */
.calc-form__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--calc-transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}
.btn-primary {
  background: linear-gradient(135deg, var(--calc-primary) 0%, var(--calc-primary-light) 100%);
  color: #fff;
  box-shadow: 0 4px 16px var(--calc-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--calc-glow);
}
.btn-accent {
  background: linear-gradient(135deg, var(--calc-accent) 0%, var(--calc-accent-hover) 100%);
  color: #1a1a1a;
  box-shadow: 0 4px 16px rgba(255, 176, 0, 0.3);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 176, 0, 0.4);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--calc-border);
  color: var(--calc-text);
}
.btn-outline:hover {
  border-color: var(--calc-primary-light);
  background: rgba(0, 59, 113, 0.1);
}
.calc-btn {
  position: relative;
  overflow: hidden;
}
.calc-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}
.calc-btn:active::after {
  width: 300px;
  height: 300px;
}

/* Results */
.calc-result {
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--calc-border);
  animation: fadeInUp 0.4s ease;
}
.calc-result__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  color: var(--calc-success);
}
.calc-result__header h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
}
.calc-result__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.calc-result__item {
  background: var(--calc-surface-2);
  border: 1px solid var(--calc-border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.calc-result__label {
  font-size: 0.8rem;
  color: var(--calc-muted);
  font-weight: 500;
}
.calc-result__value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--calc-accent);
}
.calc-result__formula {
  background: rgba(0, 59, 113, 0.15);
  border: 1px solid rgba(0, 59, 113, 0.3);
  border-radius: 10px;
  padding: 14px 18px;
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--calc-muted);
  margin-bottom: 24px;
  overflow-x: auto;
}
.calc-result__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.calc-result__note {
  font-size: 0.85rem;
  color: var(--calc-muted);
  margin: 16px 0;
  font-style: italic;
}

/* Table */
.calc-result__table-wrap {
  overflow-x: auto;
  margin: 16px 0;
  border-radius: 12px;
  border: 1px solid var(--calc-border);
}
.calc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.calc-table th {
  background: #1a2736;
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: #94a3b8;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid #3d5166;
}
.calc-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--calc-border);
  color: var(--calc-text);
}
.calc-table tr:last-child td { border-bottom: none; }
.calc-table tr:hover td {
  background: rgba(0, 59, 113, 0.1);
}
.calc-table .model-name {
  font-weight: 700;
  color: var(--calc-accent);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.modal-card {
  background: var(--calc-surface);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
  padding: 40px;
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp 0.3s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--calc-border);
  background: var(--calc-surface-2);
  color: var(--calc-text);
  font-size: 1.2rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all var(--calc-transition);
}
.modal-close:hover {
  background: var(--calc-error);
  border-color: var(--calc-error);
  color: #fff;
}
.modal-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.modal-desc {
  font-size: 0.9rem;
  color: var(--calc-muted);
  margin-bottom: 24px;
}
.modal-success {
  text-align: center;
  padding: 40px 20px;
}
.modal-success h4 {
  font-size: 1.2rem;
  color: #fff;
  margin: 16px 0 8px;
}
.modal-success p {
  color: var(--calc-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .calc-card {
    padding: 24px 16px;
  }
  .calc-form__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .calc-result__grid {
    grid-template-columns: 1fr;
  }
  .calc-form__actions {
    flex-direction: column;
  }
  .calc-form__actions .btn {
    width: 100%;
    justify-content: center;
  }
  .calc-result__actions {
    flex-direction: column;
  }
  .calc-result__actions .btn {
    width: 100%;
    justify-content: center;
  }
  .calc-steps {
    flex-wrap: wrap;
    gap: 8px;
  }
  .calc-step__line {
    width: 30px;
    margin: 0 8px;
  }
  .calc-hero__title {
    font-size: 1.6rem;
  }
  .modal-card {
    padding: 24px 16px;
  }
  .calc-table {
    font-size: 0.8rem;
  }
  .calc-table th,
  .calc-table td {
    padding: 8px 10px;
  }
}

@media (max-width: 480px) {
  .calc-step__label {
    font-size: 0.75rem;
  }
  .calc-card__header {
    flex-direction: column;
    text-align: center;
  }
}

/* Scrollbar */
.select-dropdown::-webkit-scrollbar,
.modal-card::-webkit-scrollbar {
  width: 6px;
}
.select-dropdown::-webkit-scrollbar-track,
.modal-card::-webkit-scrollbar-track {
  background: transparent;
}
.select-dropdown::-webkit-scrollbar-thumb,
.modal-card::-webkit-scrollbar-thumb {
  background: var(--calc-border);
  border-radius: 3px;
}

/* Loading state */
.btn.loading {
  pointer-events: none;
  opacity: 0.7;
}
.btn.loading::before {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 8px;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Dark header for calculator page ===== */
.site-header {
  background: rgba(15, 25, 35, 0.97) !important;
  border-bottom: 1px solid var(--calc-border) !important;
}
.desktop-nav a {
  color: #cbd5e1 !important;
}
.desktop-nav a:hover {
  color: #fff !important;
}
.header-email {
  color: #e2e8f0 !important;
}
.header-phone {
  color: #e2e8f0 !important;
}
.header-phone:hover {
  color: #fff !important;
}
.topbar {
  background: #0a121c !important;
}
.topbar a {
  color: #cbd5e1 !important;
}
.topbar a:hover {
  color: #fff !important;
}