/* ============================================================
   VDI Calculator - Modern Design System
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-bg: #f4f6f9;
  --color-surface: #ffffff;
  --color-surface-alt: #f8f9fb;
  --color-border: #e2e6ed;
  --color-text: #1a1d23;
  --color-text-secondary: #5a6170;
  --color-text-muted: #8b92a0;

  --color-primary: #2563eb;
  --color-primary-light: #dbeafe;
  --color-primary-dark: #1d4ed8;

  --color-host: #f59e0b;
  --color-host-bg: #fffbeb;
  --color-host-border: #fde68a;

  --color-storage: #3b82f6;
  --color-storage-bg: #eff6ff;
  --color-storage-border: #bfdbfe;

  --color-virt: #10b981;
  --color-virt-bg: #ecfdf5;
  --color-virt-border: #a7f3d0;

  --color-azure: #8b5cf6;
  --color-azure-bg: #f5f3ff;
  --color-azure-border: #c4b5fd;

  --color-danger: #ef4444;
  --color-danger-bg: #fef2f2;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.06), 0 4px 6px rgba(0,0,0,0.03);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ---------- Layout ---------- */
.app-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

/* ---------- Header ---------- */
.app-header {
  text-align: center;
  margin-bottom: 32px;
  padding: 32px 0 24px;
}

.app-header__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.app-header__logo svg {
  width: 28px;
  height: 28px;
  color: #fff;
}

.app-header__title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 4px;
}

.app-header__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* ---------- Profile Bar ---------- */
.profile-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.profile-bar__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.profile-bar__tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.profile-tab {
  padding: 7px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.profile-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.profile-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

/* ---------- Section Card ---------- */
.section-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.section-card:hover {
  box-shadow: var(--shadow-md);
}

.section-card__header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.section-card__header:hover {
  background: #f0f2f5;
}

.section-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.section-card__icon svg {
  width: 18px;
  height: 18px;
}

.section-card__icon--vm {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.section-card__icon--host {
  background: var(--color-host-bg);
  color: var(--color-host);
}

.section-card__icon--storage {
  background: var(--color-storage-bg);
  color: var(--color-storage);
}

.section-card__icon--virt {
  background: var(--color-virt-bg);
  color: var(--color-virt);
}

.section-card__title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  flex: 1;
}

.section-card__chevron {
  color: var(--color-text-muted);
  transition: transform var(--transition-base);
}

.section-card__chevron svg {
  width: 18px;
  height: 18px;
  display: block;
}

.section-card.collapsed .section-card__chevron {
  transform: rotate(-90deg);
}

.section-card__body {
  padding: 16px 20px 20px;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow), opacity var(--transition-base);
  max-height: 600px;
  opacity: 1;
}

.section-card.collapsed .section-card__body {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
}

/* ---------- Form Grid ---------- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-field__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.01em;
}

.form-field__help {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  margin-top: -2px;
}

.form-field input,
.form-field select {
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
}

.form-field input:hover,
.form-field select:hover {
  border-color: #c8cdd6;
}

.form-field input:focus,
.form-field select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.form-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235a6170' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

/* ---------- Results Dashboard ---------- */
.results-section {
  margin-top: 28px;
  margin-bottom: 24px;
}

.results-section__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 12px;
}

.result-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.result-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.result-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
}

.result-card__content {
  flex: 1;
  min-width: 0;
}

.result-card__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  line-height: 1.3;
}

.result-card__value {
  font-size: 1.375rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  line-height: 1.2;
  transition: color var(--transition-fast);
}

/* Result card color variants */
.result-card--host {
  background: var(--color-host-bg);
  border-color: var(--color-host-border);
}
.result-card--host .result-card__dot { background: var(--color-host); }
.result-card--host .result-card__value { color: #92400e; }

.result-card--storage {
  background: var(--color-storage-bg);
  border-color: var(--color-storage-border);
}
.result-card--storage .result-card__dot { background: var(--color-storage); }
.result-card--storage .result-card__value { color: #1e40af; }

.result-card--virt {
  background: var(--color-virt-bg);
  border-color: var(--color-virt-border);
}
.result-card--virt .result-card__dot { background: var(--color-virt); }
.result-card--virt .result-card__value { color: #065f46; }

.result-card--azure {
  background: var(--color-azure-bg);
  border-color: var(--color-azure-border);
}
.result-card--azure .result-card__dot { background: var(--color-azure); }
.result-card--azure .result-card__value { color: #5b21b6; font-size: 1.125rem; }

/* ---------- Category Headers in Results ---------- */
.results-category {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
}

.results-category:first-child {
  margin-top: 0;
}

.results-category__label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.results-category__line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.results-category--host .results-category__label { color: var(--color-host); }
.results-category--storage .results-category__label { color: var(--color-storage); }
.results-category--virt .results-category__label { color: var(--color-virt); }
.results-category--azure .results-category__label { color: var(--color-azure); }

/* ---------- Error Banner ---------- */
.error-banner {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--color-danger-bg);
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  animation: slideDown var(--transition-base);
}

.error-banner.visible {
  display: flex;
}

.error-banner__icon {
  color: var(--color-danger);
  flex-shrink: 0;
}

.error-banner__icon svg {
  width: 18px;
  height: 18px;
}

.error-banner__text {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-danger);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Action Bar ---------- */
.action-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
  text-decoration: none;
}

.btn:hover {
  border-color: #c8cdd6;
  color: var(--color-text);
  background: var(--color-surface-alt);
}

.btn svg {
  width: 15px;
  height: 15px;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.2);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  padding: 20px;
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0,0,0,0.05);
  max-width: 480px;
  width: 100%;
  transform: translateY(12px) scale(0.97);
  transition: transform var(--transition-base);
}

.modal-overlay.visible .modal-content {
  transform: translateY(0) scale(1);
}

.modal-content__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.modal-content__title {
  font-size: 1.125rem;
  font-weight: 700;
}

.modal-content__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-content__close:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.modal-content__close svg {
  width: 18px;
  height: 18px;
}

.modal-content__body {
  padding: 16px 24px 24px;
}

.modal-content__body p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
}

.modal-content__body p:last-child {
  margin-bottom: 0;
}

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  padding: 20px 0 8px;
  border-top: 1px solid var(--color-border);
  margin-top: 8px;
}

.app-footer__text {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ---------- Print Styles ---------- */
@media print {
  body {
    background: #fff;
  }

  .d-print-none {
    display: none !important;
  }

  .section-card {
    break-inside: avoid;
    box-shadow: none;
    border-color: #ddd;
  }

  .result-card {
    break-inside: avoid;
  }

  .app-header {
    margin-bottom: 16px;
    padding: 8px 0;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .app-container {
    padding: 16px 12px 32px;
  }

  .app-header {
    margin-bottom: 20px;
    padding: 20px 0 16px;
  }

  .app-header__title {
    font-size: 1.375rem;
  }

  .profile-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
  }

  .profile-bar__tabs {
    width: 100%;
  }

  .profile-tab {
    flex: 1;
    text-align: center;
    padding: 8px 12px;
  }

  .form-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .results-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .section-card__header {
    padding: 12px 16px;
  }

  .section-card__body {
    padding: 12px 16px 16px;
  }

  .result-card {
    padding: 12px;
  }

  .result-card__value {
    font-size: 1.125rem;
  }
}

@media (max-width: 480px) {
  .form-grid {
    grid-template-columns: 1fr;
  }

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

  .action-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }
}