/* =======================================================================
   forms.css — Inputs, Selects, Textareas, Toggles, Validation States
   Advanced Solar Load Calculator — Production CSS Architecture
   ======================================================================= */

/* ── Base input style ──────────────────────────────────────────────── */
.ipt,
.form-input {
  width: 100%;
  background: rgba(15, 20, 36, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 7px 10px;
  font-size: var(--fs-sm);
  color: var(--text);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  font-family: inherit;
}

.ipt:focus,
.form-input:focus {
  border-color: var(--accent);
  background: rgba(15, 20, 36, 0.9);
  outline: none;
}

.ipt::placeholder,
.form-input::placeholder {
  color: var(--text-4);
}

/* Textarea */
textarea.ipt,
textarea.form-input {
  resize: vertical;
  min-height: 2.5rem;
}

/* Select */
select.ipt,
select.form-input {
  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'%3E%3Cpath fill='%236b7a9c' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: left 10px center;
  padding-left: 28px;
  cursor: pointer;
}

/* ── Search input ──────────────────────────────────────────────────── */
.search-input {
  width: 100%;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: var(--fs-sm);
  transition: border-color var(--transition-fast);
}
.search-input:focus {
  border-color: var(--accent);
  outline: none;
}
.search-input::placeholder {
  color: var(--text-4);
}

/* ── Filter select ─────────────────────────────────────────────────── */
.filter-select {
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: var(--fs-sm);
  cursor: pointer;
}
.filter-select:focus {
  border-color: var(--accent);
  outline: none;
}

/* ── Project name input (header) ───────────────────────────────────── */
.project-name-input {
  background: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: 2px 0;
  width: 12rem;
  transition: border-color var(--transition-fast);
}
.project-name-input:hover {
  border-bottom-color: var(--text-3);
}
.project-name-input:focus {
  border-bottom-color: var(--accent);
  outline: none;
}

/* ── Expert level select (header) ──────────────────────────────────── */
.expert-level-select {
  padding: var(--sp-1) var(--sp-2);
  border-radius: var(--radius-md);
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--border-2);
  color: var(--text-2);
  font-size: var(--fs-xs);
  cursor: pointer;
}
.expert-level-select:focus {
  border-color: var(--accent);
  outline: none;
}

/* ── Form grid ─────────────────────────────────────────────────────── */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}

@media (min-width: 768px) {
  .form-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .form-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ── Form field ────────────────────────────────────────────────────── */
.form-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-label {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-3);
}

.form-subtitle {
  font-size: var(--fs-xs);
  color: var(--text-3);
  margin-bottom: var(--sp-2);
}

/* ── Toggle switch ─────────────────────────────────────────────────── */
.toggle-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  font-size: var(--fs-xs);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: none;
  width: 100%;
  text-align: right;
  color: var(--text-3);
}
.toggle-btn:hover {
  background: rgba(30,41,59,0.4);
}
.toggle-btn.active {
  background: rgba(16,185,129,0.15);
  border-color: rgba(16,185,129,0.4);
  color: #a7f3d0;
}

.toggle-track {
  width: 2rem;
  height: 1rem;
  border-radius: var(--radius-full);
  position: relative;
  transition: background var(--transition-fast);
  background: rgba(51,65,85,1);
  flex-shrink: 0;
}
.toggle-btn.active .toggle-track {
  background: var(--emerald);
}
.toggle-thumb {
  position: absolute;
  top: 2px;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: #fff;
  transition: left var(--transition-fast);
  left: 2px;
}
.toggle-btn.active .toggle-thumb {
  left: calc(100% - 0.75rem - 2px);
}

/* ── Validation states ─────────────────────────────────────────────── */
.input-error {
  border-color: var(--red) !important;
  box-shadow: 0 0 0 1px rgba(239,68,68,0.3);
}
.input-warning {
  border-color: var(--solar) !important;
}
.input-valid {
  border-color: var(--emerald) !important;
}

.field-error {
  font-size: var(--fs-xs);
  color: #fca5a5;
  margin-top: 2px;
}
.field-warning {
  font-size: var(--fs-xs);
  color: #fcd34d;
  margin-top: 2px;
}

/* ── Checkbox ──────────────────────────────────────────────────────── */
input[type="checkbox"] {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  cursor: pointer;
}

/* ── Inventory filters row ─────────────────────────────────────────── */
.inventory-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}
.inventory-filters .search-input {
  flex: 1;
  min-width: 200px;
}

/* ── Disabled state ────────────────────────────────────────────────── */
input:disabled, select:disabled, textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Date/time inputs ──────────────────────────────────────────────── */
input[type="date"],
input[type="time"] {
  color-scheme: dark;
}