/**
 * calculator.css — Gradbau.com
 * Step-by-step calculator UI components.
 * Selectors target DOM produced by calc-ui.js (do not rename).
 * Requires tokens.css and base.css to be loaded first.
 */

/* ═══════ HEADER (calculator page) ═══════ */
.calc-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-header);
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 36px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.calc-logo {
  font-family: var(--font-d);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.03em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 7px;
  text-decoration: none;
}
.calc-logo-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
}
.calc-hdr-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.calc-hdr-back {
  font-size: 13px;
  color: var(--text-2);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.calc-hdr-back:hover { color: var(--text); }
.calc-th-btn {
  width: 32px; height: 32px;
  border-radius: 7px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-2);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}
.calc-th-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ═══════ PROGRESS BAR ═══════ */
.progress-wrap {
  position: fixed;
  top: 58px;
  left: 0; right: 0;
  z-index: var(--z-sticky);
  background: color-mix(in srgb, var(--bg) 95%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 12px 36px 14px;
}
.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.progress-step {
  font-family: var(--font-m);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-2);
}
.progress-step-cur {
  color: var(--accent);
  font-weight: 500;
}
.progress-block {
  font-family: var(--font-m);
  font-size: 10px;
  color: var(--text-2);
  letter-spacing: .04em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.progress-block-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
}
.progress-bar {
  display: flex;
  gap: 3px;
  height: 3px;
}
.prog-seg {
  flex: 1;
  border-radius: 2px;
  background: var(--bg-3);
  transition: background .3s var(--ease);
}
.prog-seg.done   { background: var(--accent); }
.prog-seg.active { background: linear-gradient(90deg, var(--accent) 50%, var(--bg-3) 50%); }

/* ═══════ MAIN LAYOUT ═══════ */
.calc-main {
  min-height: 100vh;
  padding: 140px 36px 80px;
  max-width: 1080px;
  margin: 0 auto;
}
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 24px;
  align-items: start;
}

/* ═══════ QUESTION CARD ═══════ */
.q-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  position: relative;
}
.q-card::before {
  content: '';
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: .5;
  pointer-events: none;
}
.q-head {
  padding: 24px 28px 18px;
}
.q-tag {
  font-family: var(--font-m);
  font-size: 9px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.q-tag::before {
  content: '';
  width: 12px; height: 1px;
  background: var(--accent);
}
.q-text {
  font-family: var(--font-d);
  font-size: clamp(18px, 2.5vw, 26px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.025em;
  color: var(--text);
}
.q-div {
  height: 1px;
  background: var(--line);
}

/* ═══════ RADIO OPTIONS ═══════ */
.q-options {
  padding: 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.opt {
  background: var(--bg-3);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 13px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  overflow: hidden;
  user-select: none;
  transition: border-color .15s, background .15s, transform .1s;
}
.opt::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
  transform: scaleY(0);
  transition: transform .18s var(--ease);
}
.opt:hover {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-3));
}
.opt:hover::before  { transform: scaleY(1); }
.opt:active         { transform: scale(.985); }
.opt.sel {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-3));
}
.opt.sel::before { transform: scaleY(1); }

.opt-radio {
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 2px solid var(--line);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .15s, background .15s;
}
.opt.sel .opt-radio {
  border-color: var(--accent);
  background: var(--accent);
}
.opt-radio-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #fff;
  transform: scale(0);
  transition: transform .2s var(--ease);
}
.opt.sel .opt-radio-dot { transform: scale(1); }
.opt-icon {
  font-size: 19px;
  flex-shrink: 0;
  width: 26px;
  text-align: center;
}
.opt-label {
  font-family: var(--font-d);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -.01em;
}
.opt-desc {
  font-size: 11px;
  color: var(--text-2);
  margin-top: 1px;
  line-height: 1.4;
}

/* ═══════ SELECT ═══════ */
.q-select { padding: 18px 24px; }
.sel-wrap { position: relative; }
.sel-input {
  width: 100%;
  background: var(--bg-3);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 15px 44px 15px 18px;
  font-family: var(--font-d);
  font-size: 15px;
  color: var(--text);
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color .15s;
}
.sel-input:focus,
.sel-input.has-val { border-color: var(--accent); }
.sel-input option {
  background: var(--bg-2);
  color: var(--text);
}
.sel-arrow {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-2);
}

/* ═══════ NUMBER ═══════ */
.q-number { padding: 18px 24px; }
.num-wrap { position: relative; }
.num-input {
  width: 100%;
  background: var(--bg-3);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 15px 56px 15px 18px;
  font-family: var(--font-m);
  font-size: 28px;
  font-weight: 500;
  color: var(--text);
  outline: none;
  -moz-appearance: textfield;
  transition: border-color .15s;
}
.num-input::-webkit-inner-spin-button,
.num-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}
.num-input:focus { border-color: var(--accent); }
.num-unit {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-m);
  font-size: 14px;
  color: var(--text-2);
  pointer-events: none;
}
.num-range {
  font-family: var(--font-m);
  font-size: 10px;
  color: var(--text-2);
  letter-spacing: .04em;
  margin-top: 7px;
}

/* ═══════ POINTS (electrical category) ═══════ */
.q-points { padding: 18px 24px; }
.points-quick-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}
.points-quick {
  background: var(--bg-3);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 8px 14px;
  font-family: var(--font-m);
  font-size: 13px;
  color: var(--text-2);
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.points-quick:hover {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
  color: var(--text);
}
.points-quick.on {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-3));
}

/* ═══════ TOGGLE ═══════ */
.q-toggle { padding: 18px 24px; }
.toggle-card {
  background: var(--bg-3);
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.toggle-card.on {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--bg-3));
}
.toggle-sw {
  width: 44px; height: 24px;
  border-radius: 12px;
  background: var(--bg-2);
  border: 1.5px solid var(--line);
  position: relative;
  flex-shrink: 0;
  margin-top: 2px;
  transition: background .2s, border-color .2s;
}
.toggle-card.on .toggle-sw {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle-knob {
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .3);
  transition: transform .2s var(--ease);
}
.toggle-card.on .toggle-knob { transform: translateX(20px); }
.toggle-title {
  font-family: var(--font-d);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 3px;
}
.toggle-desc {
  font-size: 11px;
  color: var(--text-2);
  line-height: 1.5;
}

/* ═══════ NAVIGATION ═══════ */
.q-nav {
  padding: 14px 24px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
}
.btn-back {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 0;
  transition: color .15s;
}
.btn-back:hover:not(:disabled) { color: var(--text); }
.btn-back:disabled {
  opacity: .3;
  cursor: default;
}
.btn-next {
  font-family: var(--font-d);
  font-size: 14px;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 11px 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -.01em;
  transition: background .15s, transform .12s, opacity .2s;
  will-change: transform;
}
.btn-next:hover:not(:disabled) {
  background: var(--accent-h);
  transform: translateY(-1px);
}
.btn-next:active:not(:disabled) { transform: translateY(0); }
.btn-next:disabled {
  opacity: .35;
  cursor: default;
  transform: none;
}
.btn-enter {
  font-family: var(--font-d);
  font-size: 14px;
  font-weight: 600;
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 11px 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -.01em;
  transition: background .15s, transform .12s;
}
.btn-enter:hover {
  background: var(--red-h);
  transform: translateY(-1px);
}

/* ═══════ DISCLAIMER ═══════ */
.disclaimer {
  margin-top: 14px;
  padding: 12px 16px;
  background: color-mix(in srgb, var(--amber) 8%, var(--bg-2));
  border: 1px solid color-mix(in srgb, var(--amber) 25%, var(--line));
  border-radius: 10px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 11px;
  color: var(--text-2);
  line-height: 1.6;
}

/* ═══════ SUMMARY SIDEBAR ═══════ */
.summary-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  position: sticky;
  top: 140px;
}
.sum-title {
  font-family: var(--font-m);
  font-size: 9px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.sum-title::before {
  content: '';
  width: 10px; height: 1px;
  background: var(--text-2);
}
.sum-item {
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.sum-item:last-child { border-bottom: none; }
.sum-lbl {
  font-size: 10px;
  color: var(--text-2);
}
.sum-val {
  font-family: var(--font-d);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
}
.sum-empty {
  font-family: var(--font-m);
  font-size: 10px;
  color: var(--text-3);
  text-align: center;
  padding: 14px 0;
  letter-spacing: .04em;
}

/* ═══════ RESPONSIVE ═══════ */
@media (max-width: 880px) {
  .calc-layout { grid-template-columns: 1fr; }
  .summary-card {
    position: static;
    order: -1;
  }
}
@media (max-width: 680px) {
  .calc-header { padding: 0 18px; }
  .progress-wrap { padding: 10px 18px 12px; }
  .calc-main { padding: 128px 18px 60px; }
  .summary-card { display: none; }
  .q-head { padding: 20px 20px 16px; }
  .q-options { padding: 14px 18px; }
  .q-select, .q-number, .q-toggle, .q-points { padding: 14px 18px; }
  .q-nav { padding: 12px 18px 18px; }
}