/* ═══════════════════════════════════════════
   ТЕНТ-ОПТ — Design System
   Brand: Navy + Blue + subtle violet
   ═══════════════════════════════════════════ */

:root {
  --c-bg: #0f172a;
  --c-surface: #1e293b;
  --c-surface-2: #273548;
  --c-border: #334155;
  --c-border-light: #475569;
  --c-text: #f1f5f9;
  --c-text-2: #94a3b8;
  --c-text-3: #64748b;
  --c-accent: #3b82f6;
  --c-accent-hover: #2563eb;
  --c-accent-soft: rgba(59, 130, 246, .12);
  --c-success: #22c55e;
  --c-danger: #ef4444;
  --c-warning: #f59e0b;
  --c-purple: #7c3aed;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0, 0, 0, .35);
  --font: 'Inter', -apple-system, sans-serif;
  --transition: .2s ease;
}

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

html {
  font-size: 14px;
}

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

/* ═══ HEADER ═══ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header__icon {
  width: 36px;
  height: 36px;
}

.header__title {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: .5px;
  color: var(--c-text);
}

.header__sub {
  display: block;
  font-size: .7rem;
  color: var(--c-text-3);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* ═══ BUTTONS ═══ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--c-accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--c-accent-hover);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
}

.btn--outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.btn--small {
  padding: 4px 10px;
  font-size: .75rem;
}

.btn--accent {
  background: var(--c-accent-soft);
  color: var(--c-accent);
  border: 1px solid transparent;
}

.btn--accent:hover {
  border-color: var(--c-accent);
}

.btn--full {
  width: 100%;
  justify-content: center;
  padding: 12px;
  font-size: .95rem;
  margin-top: 20px;
}

.btn--danger {
  color: var(--c-danger);
  background: rgba(239, 68, 68, .08);
}

.btn--danger:hover {
  background: rgba(239, 68, 68, .18);
}

.btn--ghost {
  background: none;
  border: none;
  color: var(--c-text-3);
  padding: 4px;
}

.btn--ghost:hover {
  color: var(--c-accent);
}

/* ═══ MAIN LAYOUT ═══ */
.main {
  display: grid;
  grid-template-columns: 340px 1fr 360px;
  gap: 0;
  min-height: calc(100vh - 61px);
}

.panel {
  padding: 20px;
  border-right: 1px solid var(--c-border);
  overflow-y: auto;
  max-height: calc(100vh - 61px);
}

.panel:last-child {
  border-right: none;
}

.panel__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border);
}

/* ═══ FORMS ═══ */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  grid-column: 1 / -1;
}

.form-grid>.form-group {
  height: 100%;
}

.form-group--half {
  grid-column: auto;
}

label {
  font-size: .75rem;
  font-weight: 600;
  color: var(--c-text-2);
  text-transform: uppercase;
  letter-spacing: .5px;
  min-height: 1.2rem;
  display: block;
  margin-bottom: auto;
  padding-bottom: 4px;
}

input,
select,
textarea {
  padding: 8px 12px;
  height: 38px;
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  color: var(--c-text);
  font-family: var(--font);
  font-size: .9rem;
  transition: var(--transition);
  width: 100%;
}

textarea {
  height: auto;
  min-height: 60px;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-soft);
}

textarea {
  resize: vertical;
}

select {
  cursor: pointer;
}

input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button {
  opacity: 1;
}

/* ═══ FITTINGS ═══ */
.fittings-section {
  margin-top: 16px;
}

.fittings-section__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .85rem;
  font-weight: 600;
  color: var(--c-text-2);
  margin-bottom: 8px;
}

.fitting-row {
  display: grid;
  grid-template-columns: 1fr 1fr 60px 28px;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
  animation: slideIn .2s ease;
}

/* ═══ PRINT OPTIMIZATION ═══ */
@media print {
  body * {
    visibility: hidden;
  }

  .modal-overlay.active,
  .modal-overlay.active * {
    visibility: visible;
  }

  .modal-overlay.active {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    background: #fff;
    backdrop-filter: none;
    padding: 0;
  }

  .modal {
    border: none;
    box-shadow: none;
    width: 100%;
    max-height: none;
  }

  .modal__header,
  .modal__footer {
    display: none !important;
  }

  .kp-document,
  .spec-document {
    padding: 0 !important;
    margin: 0 !important;
  }
}

.fitting-row input {
  font-size: .8rem;
  padding: 7px 8px;
}

.fitting-row label {
  font-size: .65rem;
}

/* ═══ PREVIEW ═══ */
.preview {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.drawing-container {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.drawing-placeholder {
  color: var(--c-text-3);
  font-size: .9rem;
}

/* ═══ RESULTS ═══ */
.results {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 16px;
}

.results__empty {
  color: var(--c-text-3);
  text-align: center;
  padding: 20px;
}

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

.results__item {
  display: flex;
  flex-direction: column;
}

.results__label {
  font-size: .7rem;
  font-weight: 600;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.results__value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-text);
}

.results__value--accent {
  color: var(--c-accent);
}

.results__value--large {
  font-size: 1.4rem;
}

.results__divider {
  grid-column: 1 / -1;
  height: 1px;
  background: var(--c-border);
  margin: 4px 0;
}

/* ═══ CART ═══ */
.cart {
  display: flex;
  flex-direction: column;
}

.cart__badge {
  background: var(--c-accent);
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 99px;
  margin-left: auto;
}

.cart__items {
  flex: 1;
  overflow-y: auto;
}

.cart__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  gap: 8px;
}

.cart__empty p {
  color: var(--c-text-3);
  font-size: .9rem;
}

.cart__hint {
  font-size: .75rem !important;
}

/* Cart Item Card */
.cart-item {
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 8px;
  animation: slideIn .25s ease;
  transition: var(--transition);
}

.cart-item:hover {
  border-color: var(--c-accent);
}

.cart-item__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 6px;
}

.cart-item__name {
  font-weight: 700;
  font-size: .9rem;
  color: var(--c-text);
}

.cart-item__actions {
  display: flex;
  gap: 2px;
}

.cart-item__params {
  font-size: .75rem;
  color: var(--c-text-2);
  line-height: 1.6;
}

.cart-item__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--c-border);
}

.cart-item__qty {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cart-item__qty button {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  font-size: .9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.cart-item__qty button:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.cart-item__qty span {
  font-weight: 700;
  font-size: .9rem;
  min-width: 20px;
  text-align: center;
}

.cart-item__price {
  font-weight: 800;
  font-size: 1rem;
  color: var(--c-accent);
}

/* Cart Footer */
.cart__footer {
  padding-top: 12px;
  border-top: 1px solid var(--c-border);
  margin-top: auto;
}

.cart__total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  margin-bottom: 4px;
}

.cart__total strong {
  font-size: 1.3rem;
  color: var(--c-accent);
}

.cart__total--sub {
  font-size: .8rem;
  color: var(--c-text-3);
  margin-bottom: 12px;
}

.cart__buttons {
  display: flex;
  gap: 8px;
}

.cart__buttons .btn {
  flex: 1;
  justify-content: center;
}

/* ═══ MODAL ═══ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: modalIn .25s ease;
}

.modal--wide {
  max-width: 900px;
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--c-border);
}

.modal__header h2 {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal__close {
  background: none;
  border: none;
  color: var(--c-text-3);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0 4px;
  transition: var(--transition);
}

.modal__close:hover {
  color: var(--c-danger);
}

.modal__body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal__footer {
  display: flex;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--c-border);
  justify-content: flex-end;
}

/* ═══ DOCUMENTS ═══ */
.kp-document,
.spec-document {
  font-family: 'Times New Roman', serif;
  background: #fff;
  color: #000;
  padding: 40px;
  border-radius: 8px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.spec-table th,
.spec-table td {
  border: 1px solid #ccc;
  padding: 6px;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}