/* Material Design 3 inspired theme */
:root {
  --primary: #0b57d0;
  --on-primary: #ffffff;
  --primary-container: #d3e3fd;
  --on-primary-container: #041e49;
  --secondary-container: #c2e7ff;
  --surface: #f8fafd;
  --surface-1: #ffffff;
  --surface-2: #f0f4f9;
  --surface-3: #e9eef6;
  --on-surface: #1f1f1f;
  --on-surface-variant: #444746;
  --outline: #747775;
  --outline-variant: #c4c7c5;
  --error: #b3261e;
  --error-container: #f9dedc;
  --on-error-container: #410e0b;
  --success: #146c2e;
  --success-container: #c4eed0;
  --warning-container: #ffdf99;
  --on-warning-container: #3f2e00;
  --info-container: #d3e3fd;
  --lvl-min: #0b57d0;
  --lvl-med: #b06000;
  --lvl-max: #b3261e;
  --lvl-min-bg: #d3e3fd;
  --lvl-med-bg: #ffe0b2;
  --lvl-max-bg: #f9dedc;
  --radius-s: 8px;
  --radius-m: 12px;
  --radius-l: 16px;
  --radius-xl: 28px;
  --shadow-1: 0 1px 2px rgba(0,0,0,.08), 0 1px 3px 1px rgba(0,0,0,.05);
  --shadow-2: 0 1px 2px rgba(0,0,0,.1), 0 2px 6px 2px rgba(0,0,0,.06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #a8c7fa;
    --on-primary: #062e6f;
    --primary-container: #0842a0;
    --on-primary-container: #d3e3fd;
    --secondary-container: #004a77;
    --surface: #131314;
    --surface-1: #1e1f20;
    --surface-2: #282a2c;
    --surface-3: #333537;
    --on-surface: #e3e3e3;
    --on-surface-variant: #c4c7c5;
    --outline: #8e918f;
    --outline-variant: #444746;
    --error: #f2b8b5;
    --error-container: #8c1d18;
    --on-error-container: #f9dedc;
    --success: #6dd58c;
    --success-container: #0f5223;
    --warning-container: #5c4300;
    --on-warning-container: #ffdf99;
    --info-container: #0842a0;
    --lvl-min: #a8c7fa;
    --lvl-med: #ffb95c;
    --lvl-max: #f2b8b5;
    --lvl-min-bg: #0842a0;
    --lvl-med-bg: #5c3a00;
    --lvl-max-bg: #8c1d18;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  font: 400 16px/1.5 Roboto, system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--surface); color: var(--on-surface);
}
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; font-weight: 500; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 1rem; }
.muted { color: var(--on-surface-variant); }
.fine { font-size: .82rem; color: var(--on-surface-variant); }
.center { text-align: center; }
.inline { display: inline; margin: 0; }

.material-symbols-rounded {
  font-family: 'Material Symbols Rounded'; font-weight: normal; font-style: normal;
  font-size: 24px; line-height: 1; display: inline-block; white-space: nowrap;
  letter-spacing: normal; text-transform: none; word-wrap: normal; direction: ltr;
  -webkit-font-smoothing: antialiased; font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  user-select: none; flex-shrink: 0;
}
.material-symbols-rounded.tiny { font-size: 16px; vertical-align: -3px; }

/* ---- Top bar ---- */
.top-bar {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 8px 16px; background: var(--surface); border-bottom: 1px solid var(--outline-variant);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--on-surface); min-width: 0; }
.brand-icon { color: var(--primary); background: var(--primary-container); border-radius: 12px; padding: 8px; }
.brand-name { font-weight: 500; font-size: 1.1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-nav { display: flex; align-items: center; gap: 4px; }

.container { width: 100%; max-width: 980px; margin: 0 auto; padding: 24px 16px 48px; flex: 1; }
.container-wide { width: 100%; max-width: 1320px; margin: 0 auto; padding: 24px 16px 48px; flex: 1; }

.footer {
  display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: center; padding: 20px 16px;
  font-size: .85rem; color: var(--on-surface-variant); border-top: 1px solid var(--outline-variant);
}
.footer a { color: inherit; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 20px; border-radius: 20px; border: 0; cursor: pointer;
  font: 500 .9rem/1 Roboto, sans-serif; letter-spacing: .01em; text-decoration: none;
  transition: box-shadow .15s, background-color .15s, opacity .15s;
}
.btn .material-symbols-rounded { font-size: 20px; }
.btn-filled { background: var(--primary); color: var(--on-primary); }
.btn-filled:hover { box-shadow: var(--shadow-1); }
.btn-outlined { background: transparent; color: var(--primary); border: 1px solid var(--outline); }
.btn-text { background: transparent; color: var(--primary); padding: 0 12px; }
.btn-text:hover, .btn-outlined:hover { background: color-mix(in srgb, var(--primary) 8%, transparent); }
.btn-lg { height: 52px; padding: 0 28px; border-radius: 26px; font-size: 1rem; }
.btn-block { width: 100%; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .45; cursor: not-allowed; box-shadow: none; }
.btn:focus-visible, .chip:focus-visible, a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }

/* ---- Cards ---- */
.card { background: var(--surface-1); border-radius: var(--radius-l); padding: 24px; box-shadow: var(--shadow-1); }

/* ---- Landing ---- */
.hero { text-align: center; padding: 32px 0 24px; }
.hero h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); max-width: 720px; margin: 16px auto 12px; }
.hero .lead { font-size: 1.1rem; color: var(--on-surface-variant); max-width: 640px; margin: 0 auto 24px; }
.beta-badge {
  display: inline-flex; align-items: center; gap: 6px; margin: 0 auto 16px; padding: 6px 14px; border-radius: 999px;
  background: var(--secondary-container); color: var(--on-primary-container); font-weight: 500; font-size: .85rem;
}
.beta-badge .material-symbols-rounded { font-size: 18px; }
.hero .beta-badge { display: flex; width: fit-content; }
.hero-icon { font-size: 56px; color: var(--primary); background: var(--primary-container); border-radius: 24px; padding: 16px; }
.hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-bottom: 8px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 24px; }
.feature-icon { color: var(--on-primary-container); background: var(--secondary-container); border-radius: 12px; padding: 10px; margin-bottom: 12px; }
.feature p { color: var(--on-surface-variant); margin: 0; }

/* ---- Auth ---- */
.auth-card { max-width: 440px; margin: 16px auto; }
.auth-head { text-align: center; margin-bottom: 20px; }
.auth-icon { font-size: 36px; color: var(--primary); background: var(--primary-container); border-radius: 50%; padding: 14px; margin-bottom: 12px; }
.auth-icon.success { color: var(--success); background: var(--success-container); }
.stack { display: flex; flex-direction: column; gap: 16px; margin-bottom: 16px; }
.checkbox { display: flex; gap: 10px; align-items: flex-start; font-size: .9rem; color: var(--on-surface-variant); }
.checkbox input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--primary); }
.price-box { display: flex; align-items: baseline; justify-content: center; gap: 6px; margin: 8px 0 16px; }
.price { font-size: 3rem; font-weight: 500; }
.price-cur { font-weight: 500; color: var(--on-surface-variant); }
.price-note { color: var(--on-surface-variant); }
.check-list { list-style: none; padding: 0; margin: 0 0 24px; }
.check-list li { display: flex; gap: 10px; align-items: center; padding: 6px 0; }
.check-list .material-symbols-rounded { color: var(--success); font-size: 20px; }

/* ---- Text fields (outlined) ---- */
.field { position: relative; display: flex; align-items: center; }
.field input {
  width: 100%; height: 56px; padding: 22px 16px 6px; font: inherit; color: var(--on-surface);
  background: transparent; border: 1px solid var(--outline); border-radius: var(--radius-s); outline: none;
  transition: border-color .15s, box-shadow .15s; -moz-appearance: textfield;
}
.field input::-webkit-outer-spin-button, .field input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field.has-icon input { padding-left: 48px; }
.field.has-suffix input { padding-right: 40px; }
.field-icon { position: absolute; left: 14px; color: var(--on-surface-variant); pointer-events: none; }
.field-suffix { position: absolute; right: 14px; color: var(--on-surface-variant); pointer-events: none; font-weight: 500; }
.field-label {
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--on-surface-variant);
  pointer-events: none; transition: all .15s; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: calc(100% - 64px);
}
.field.has-icon .field-label { left: 48px; }
.field input:focus + .field-label, .field input:not(:placeholder-shown) + .field-label {
  top: 14px; font-size: .75rem;
}
.field input:focus { border: 2px solid var(--primary); padding-left: 15px; }
.field.has-icon input:focus { padding-left: 47px; }
.field input:focus + .field-label { color: var(--primary); }
.field-wrap.invalid .field input { border: 2px solid var(--error); padding-left: 15px; }
.field-wrap.invalid .field.has-icon input { padding-left: 47px; }
.field-wrap.invalid .field-label, .field-wrap.invalid .field-icon { color: var(--error); }
.field-wrap.valid .field-icon { color: var(--primary); }
.helper, .error-text { font-size: .78rem; margin: 4px 16px 0; color: var(--on-surface-variant); }
.error-text { color: var(--error); display: none; }
.field-wrap.invalid .helper { display: none; }
.field-wrap.invalid .error-text { display: block; }

.field.field-missing input { border: 2px solid var(--error); }
.field.field-missing .field-label, .checkbox.field-missing { color: var(--error); }

/* ---- Banners ---- */
.banner {
  display: flex; gap: 12px; align-items: flex-start; padding: 12px 16px; border-radius: var(--radius-m);
  margin-bottom: 16px; font-size: .92rem;
}
.banner-error { background: var(--error-container); color: var(--on-error-container); }
.banner-success { background: var(--success-container); color: var(--on-surface); }
.banner-info { background: var(--info-container); color: var(--on-primary-container); }
.banner-warning { background: var(--warning-container); color: var(--on-warning-container); }

/* ---- Calculator ---- */
.calc-layout { display: grid; grid-template-columns: minmax(0, 520px) minmax(0, 1fr); gap: 24px; align-items: start; }
.calc-form { position: sticky; top: 80px; }
.form-title { margin-bottom: 8px; }
.form-title h1 { font-size: 1.4rem; }
.section { border: 0; padding: 0; margin: 0 0 20px; }
.section legend { display: flex; align-items: center; gap: 10px; font-weight: 500; margin-bottom: 14px; padding: 0; }
.section-icon { color: var(--on-primary-container); background: var(--secondary-container); border-radius: 10px; padding: 6px; font-size: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; }
.field-wrap { margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.chip {
  height: 32px; padding: 0 14px; border-radius: 8px; border: 1px solid var(--outline); background: transparent;
  color: var(--on-surface-variant); font: 500 .82rem Roboto, sans-serif; cursor: pointer;
}
.chip:hover { background: color-mix(in srgb, var(--on-surface) 6%, transparent); }
.chip.selected { background: var(--secondary-container); border-color: transparent; color: var(--on-primary-container); }
.form-actions { display: flex; align-items: center; justify-content: flex-end; gap: 8px; flex-wrap: wrap; border-top: 1px solid var(--outline-variant); padding-top: 16px; }
.missing-count { margin: 0 auto 0 0; font-size: .85rem; color: var(--on-surface-variant); display: flex; align-items: center; gap: 6px; }
.missing-count.ok { color: var(--success); }

.results { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.empty-state { text-align: center; padding: 56px 24px; }
.empty-state .material-symbols-rounded { font-size: 48px; color: var(--outline); margin-bottom: 12px; }
.results-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.results-head h2 { margin: 0; display: flex; align-items: center; gap: 10px; }
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.stat { background: var(--surface-2); border-radius: var(--radius-m); padding: 14px 16px; }
.stat-label { font-size: .78rem; color: var(--on-surface-variant); display: flex; align-items: center; gap: 6px; }
.stat-label .material-symbols-rounded { font-size: 18px; }
.stat-value { font: 500 1.3rem 'Roboto Mono', monospace; margin-top: 4px; }

.levels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.level { border-radius: var(--radius-l); padding: 18px; background: var(--surface-1); box-shadow: var(--shadow-1); border-top: 4px solid var(--lvl); }
.level.min { --lvl: var(--lvl-min); --lvl-bg: var(--lvl-min-bg); }
.level.med { --lvl: var(--lvl-med); --lvl-bg: var(--lvl-med-bg); }
.level.max { --lvl: var(--lvl-max); --lvl-bg: var(--lvl-max-bg); }
.level-head { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.level-icon { background: var(--lvl-bg); color: var(--lvl); border-radius: 10px; padding: 6px; }
.level-name { font-weight: 500; }
.level-desc { font-size: .78rem; color: var(--on-surface-variant); margin: 0 0 12px; min-height: 2.4em; }
.level-big { font: 500 1.7rem 'Roboto Mono', monospace; color: var(--lvl); word-break: break-word; }
.level-unit { font-size: .82rem; color: var(--on-surface-variant); margin-bottom: 12px; }
.level dl { margin: 0; display: grid; grid-template-columns: auto auto; gap: 4px 8px; font-size: .85rem; }
.level dt { color: var(--on-surface-variant); }
.level dd { margin: 0; text-align: right; font-family: 'Roboto Mono', monospace; }

.table-card { padding: 0; overflow: hidden; }
.table-card h3 { padding: 18px 20px 0; display: flex; align-items: center; gap: 10px; }
.table-scroll { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: .88rem; }
table.data th, table.data td { padding: 10px 14px; text-align: right; white-space: nowrap; border-bottom: 1px solid var(--outline-variant); }
table.data th:first-child, table.data td:first-child { text-align: left; }
table.data thead th { color: var(--on-surface-variant); font-weight: 500; font-size: .78rem; background: var(--surface-2); }
table.data td { font-family: 'Roboto Mono', monospace; }
table.data td:first-child { font-family: Roboto, sans-serif; font-weight: 500; }
table.data tr:last-child td { border-bottom: 0; }
table.data td .amps { font-weight: 500; }
table.data td .circuit { font-size: .72rem; color: var(--on-surface-variant); }
.results { scroll-margin-top: 80px; }
.field.has-suffix .field-label { max-width: calc(100% - 92px); }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; vertical-align: 0; }
.table-note { font-size: .78rem; color: var(--on-surface-variant); padding: 12px 20px 18px; margin: 0; }

.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { margin-top: 1.5rem; }

@media (max-width: 1000px) {
  .calc-layout { grid-template-columns: 1fr; }
  .calc-form { position: static; }
}
@media (max-width: 640px) {
  .hide-sm { display: none; }
  .grid-2 { grid-template-columns: 1fr; }
  .levels { grid-template-columns: 1fr; }
  .card { padding: 18px; }
  .top-bar .btn-filled { padding: 0 14px; }
  .form-actions .btn-lg { flex: 1; }
  table.data th, table.data td { padding: 8px 8px; font-size: .8rem; }
  table.data th .dot { display: none; }
}

@media print {
  .top-bar, .footer, .calc-form, .no-print { display: none !important; }
  .calc-layout { display: block; }
  body { background: #fff; color: #000; }
  .card, .level { box-shadow: none; border: 1px solid #ccc; }
}