/* ============================================================
   PipeDeck — ASME B36.10M pipe data & weight calculator
   ============================================================ */

:root {
  --teal-50:  #f0fdfa;
  --teal-100: #ccfbf1;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  --teal-800: #115e59;

  --bg:        #f6f8f9;
  --surface:   #ffffff;
  --surface-2: #f1f5f5;
  --border:    #e2e8e9;
  --border-strong: #cbd5d6;

  --text:      #142026;
  --text-soft: #4a5b63;
  --text-mute: #76888f;

  --accent:    var(--teal-700);
  --accent-soft: var(--teal-50);
  --danger:    #c0392b;
  --warn-bg:   #fff8e6;
  --warn-border: #f0d98a;
  --warn-text: #7a5c00;

  --shadow-sm: 0 1px 2px rgba(16,40,48,.06), 0 1px 3px rgba(16,40,48,.05);
  --shadow-md: 0 4px 14px rgba(16,40,48,.08), 0 2px 6px rgba(16,40,48,.05);
  --radius: 14px;
  --radius-sm: 9px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, "Cascadia Code", Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  --bg:        #0d1417;
  --surface:   #141e22;
  --surface-2: #1b272c;
  --border:    #263438;
  --border-strong: #354549;

  --text:      #e7eef0;
  --text-soft: #aebdc2;
  --text-mute: #7d9097;

  --accent:    var(--teal-500);
  --accent-soft: #11302d;
  --danger:    #e57363;
  --warn-bg:   #2c2410;
  --warn-border: #5c4d1c;
  --warn-text: #e3c86b;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 6px 20px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2 { margin: 0; font-weight: 650; letter-spacing: -0.01em; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: 10px 16px; z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ---------------- Header ---------------- */
.app-header {
  display: flex; align-items: center; gap: 20px;
  padding: 12px clamp(14px, 4vw, 32px);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 40;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark { color: var(--accent); display: flex; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 1.15rem; letter-spacing: -0.02em; }
.brand-text small { color: var(--text-mute); font-size: .72rem; font-weight: 600; letter-spacing: .03em; }

.tabs { display: flex; gap: 4px; margin: 0 auto 0 8px; background: var(--surface-2); padding: 4px; border-radius: 999px; }
.tab {
  border: none; background: transparent; cursor: pointer;
  padding: 8px 18px; border-radius: 999px; font-size: .9rem; font-weight: 600;
  color: var(--text-soft); font-family: inherit; transition: .15s;
}
.tab:hover { color: var(--text); }
.tab.is-active { background: var(--surface); color: var(--accent); box-shadow: var(--shadow-sm); }

.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.unit-switch { display: flex; background: var(--surface-2); border-radius: 999px; padding: 3px; }
.unit-btn {
  border: none; background: transparent; cursor: pointer; font-family: inherit;
  padding: 6px 14px; border-radius: 999px; font-size: .82rem; font-weight: 600; color: var(--text-soft);
  transition: .15s;
}
.unit-btn.is-active { background: var(--accent); color: #fff; }

.prec-select {
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-soft);
  border-radius: 999px; padding: 7px 28px 7px 13px; font-size: .82rem; font-weight: 600; cursor: pointer;
  font-family: inherit; 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 d='M2 4l4 4 4-4' fill='none' stroke='%2376888f' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 11px center;
}
.prec-select:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------- Auth (Supabase) ---------------- */
.auth-chip { border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-soft);
  border-radius: 999px; padding: 7px 14px; font-size: .82rem; font-weight: 600; cursor: pointer; font-family: inherit;
  display: inline-flex; align-items: center; gap: 7px; transition: .15s; }
.auth-chip:hover { border-color: var(--accent); color: var(--accent); }
.auth-badge { background: var(--danger); color: #fff; border-radius: 999px; min-width: 18px; height: 18px;
  padding: 0 5px; font-size: .72rem; display: inline-flex; align-items: center; justify-content: center; }

body.auth-locked { overflow: hidden; }
body.auth-locked .app-header, body.auth-locked main, body.auth-locked .app-footer { pointer-events: none; filter: blur(3px); }

.auth-overlay { position: fixed; inset: 0; z-index: 200; display: grid; place-items: center;
  background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(4px); padding: 20px; }
.auth-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-md); padding: 30px clamp(22px, 4vw, 36px); width: 100%; max-width: 380px; text-align: center; }
.auth-brand { display: flex; align-items: center; justify-content: center; gap: 11px; color: var(--accent); margin-bottom: 18px; }
.auth-brand strong { display: block; font-size: 1.2rem; letter-spacing: -0.02em; color: var(--text); text-align: left; }
.auth-brand small { display: block; color: var(--text-mute); font-size: .72rem; font-weight: 600; text-align: left; }
.auth-card h2 { font-size: 1.15rem; margin-bottom: 10px; }
.auth-card .field { text-align: left; }
.auth-msg { color: var(--text-soft); font-size: .9rem; margin: 6px 0 16px; }
.auth-err { color: var(--danger); }
.auth-foot { color: var(--text-mute); font-size: .78rem; margin: 14px 0 0; }
.auth-seg { margin-bottom: 18px; }
.auth-card .btn-block { margin-top: 4px; }
.auth-card .btn-ghost { margin-top: 10px; width: 100%; }

.admin-modal { position: fixed; inset: 0; z-index: 210; display: grid; place-items: center; padding: 20px;
  background: rgba(0,0,0,.45); }
.admin-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-md); width: 100%; max-width: 720px; max-height: 85vh; overflow: auto; padding: 22px; }
.admin-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.admin-x { border: none; background: var(--surface-2); color: var(--text-soft); width: 32px; height: 32px;
  border-radius: 8px; font-size: 1.2rem; cursor: pointer; }
.admin-sub { font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-mute); margin: 18px 0 8px; }
.admin-empty { color: var(--text-mute); font-size: .9rem; padding: 8px 0; }
.admin-act { text-align: right; white-space: nowrap; }
.admin-you { color: var(--text-mute); font-size: .8rem; }
.row-btn.ap { border-color: var(--accent); color: var(--accent); }
.row-btn.rj { margin-left: 6px; }
.row-btn.rj:hover { border-color: var(--danger); color: var(--danger); }
.status-tag { font-size: .74rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.status-tag.s-pending { background: var(--warn-bg); color: var(--warn-text); }
.status-tag.s-approved { background: var(--accent-soft); color: var(--accent); }
.status-tag.s-rejected { background: var(--surface-2); color: var(--text-mute); }
.admin-badge2 { font-size: .68rem; font-weight: 700; color: var(--accent); border: 1px solid var(--accent); border-radius: 4px; padding: 0 4px; }

.theme-toggle {
  border: 1px solid var(--border); background: var(--surface); cursor: pointer;
  width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center;
  color: var(--text-soft); transition: .15s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* ---------------- Layout ---------------- */
main { min-height: calc(100vh - 130px); }
.panel { display: none; }
.panel.is-active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.panel-inner { max-width: 1180px; margin: 0 auto; padding: clamp(20px, 4vw, 38px) clamp(14px, 4vw, 32px) 60px; }

.page-intro { margin-bottom: 24px; }
.page-intro h1 { font-size: clamp(1.5rem, 3vw, 2rem); }
.page-intro p { color: var(--text-soft); margin: 8px 0 0; max-width: 60ch; }

/* ---------------- Cards ---------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.card-title { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-mute); margin-bottom: 16px; }

/* ---------------- Calculator ---------------- */
.calc-grid { display: grid; grid-template-columns: minmax(280px, 360px) 1fr; gap: 20px; margin-bottom: 20px; }
@media (max-width: 820px) { .calc-grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field label { font-size: .82rem; font-weight: 600; color: var(--text-soft); }
.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }
.field-narrow { max-width: 100px; }
.field-grow { flex: 1 1 220px; }

input, select {
  font-family: inherit; font-size: .95rem; color: var(--text);
  background: var(--surface); border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); padding: 10px 12px; width: 100%;
  transition: border-color .15s, box-shadow .15s;
}
select { cursor: pointer; 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 d='M2 4l4 4 4-4' fill='none' stroke='%2376888f' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px;
}
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------------- Buttons ---------------- */
.btn {
  font-family: inherit; font-size: .9rem; font-weight: 600; cursor: pointer;
  border-radius: var(--radius-sm); padding: 10px 16px; border: 1px solid transparent;
  transition: .15s; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--teal-800); }
[data-theme="dark"] .btn-primary:hover:not(:disabled) { background: var(--teal-600); }
.btn-block { width: 100%; margin-top: 4px; }
.btn-ghost { background: var(--surface); border-color: var(--border-strong); color: var(--text-soft); }
.btn-ghost:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn-danger:hover:not(:disabled) { border-color: var(--danger); color: var(--danger); }

/* ---------------- Result card ---------------- */
.result-card { display: flex; flex-direction: column; }
.result-headline {
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 18px 20px; margin-bottom: 18px;
}
.result-main { display: flex; align-items: baseline; gap: 8px; }
.result-value { font-size: clamp(2rem, 5vw, 2.8rem); font-weight: 700; letter-spacing: -0.02em; color: var(--accent); line-height: 1; }
.result-unit { font-size: 1.1rem; font-weight: 600; color: var(--text-soft); }
.result-caption { margin: 6px 0 0; color: var(--text-soft); font-size: .85rem; }

.result-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.result-stats > div { background: var(--surface); padding: 11px 14px; }
.result-stats dt { font-size: .73rem; color: var(--text-mute); text-transform: uppercase; letter-spacing: .04em; }
.result-stats dd { margin: 3px 0 0; font-size: 1rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.result-op { background: var(--accent-soft) !important; }
.result-note { margin: 14px 0 0; font-size: .82rem; color: var(--text-mute); min-height: 1em; }

/* Cross-section + headline row */
.result-top { display: flex; align-items: center; gap: 18px; margin-bottom: 18px; flex-wrap: wrap; }
.result-top .result-headline { flex: 1 1 200px; margin-bottom: 0; }
.xsec-figure { margin: 0; flex: 0 0 auto; text-align: center; }
.xsec { width: 220px; max-width: 46vw; }
.xsec svg { width: 100%; height: auto; display: block; }
.xsec-figure figcaption { font-size: .72rem; color: var(--text-mute); margin-top: 2px; }

/* SVG cross-section theming */
.xs-steel { fill: var(--accent); opacity: .18; }
.xs-bore  { fill: var(--surface); }
.xs-line  { fill: none; stroke: var(--accent); stroke-width: 2; }
.xs-dim   { stroke: var(--text-mute); stroke-width: 1; }
.xs-tick  { stroke: var(--text-mute); stroke-width: 1; }
.xs-text  { fill: var(--text); font-size: 12px; font-weight: 600; font-family: var(--font); }
.xs-text.sub { fill: var(--text-mute); font-size: 10.5px; font-weight: 500; }
.xs-arrow { fill: var(--text-mute); }

.row-sub { display: block; font-size: .72rem; font-weight: 500; color: var(--text-mute); }

.subsection-title { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-mute); margin: 16px 0 8px; }
.result-props > div { background: var(--surface) !important; }

/* ---------------- Flange evaluator ---------------- */
.field-hint { margin: 4px 0 0; font-size: .78rem; color: var(--text-mute); }
.input-unit { display: flex; gap: 8px; align-items: stretch; }
.input-unit input { flex: 1; }
.input-unit select { width: auto; flex: 0 0 auto; min-width: 92px; }
.unit-tag { display: flex; align-items: center; padding: 0 12px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); background: var(--surface-2); color: var(--text-soft); font-size: .85rem; font-weight: 600; }

.fl-headline { font-size: clamp(1.8rem, 4.5vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; color: var(--text); }
.fl-headline.pass { color: var(--accent); }
.fl-headline.fail { color: var(--danger); }

.fl-all-units { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 520px) { .fl-all-units { grid-template-columns: 1fr 1fr; } }

.fl-warn { margin: 14px 0 0; background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: var(--radius-sm); padding: 10px 14px; }
.fl-warn p { margin: 4px 0; font-size: .84rem; color: var(--warn-text); }

.fl-ok { color: var(--accent); font-weight: 700; }
.fl-no { color: var(--danger); font-weight: 700; }
.fl-dash { color: var(--text-mute); }
.data-table tr.is-fail td { color: var(--text-mute); }

/* ---------------- Section properties ---------------- */
.seg { display: flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: var(--radius-sm); margin-bottom: 18px; }
.seg-btn { flex: 1; border: none; background: transparent; cursor: pointer; font-family: inherit;
  padding: 8px 6px; border-radius: 7px; font-size: .86rem; font-weight: 600; color: var(--text-soft); transition: .15s; }
.seg-btn:hover { color: var(--text); }
.seg-btn.is-active { background: var(--surface); color: var(--accent); box-shadow: var(--shadow-sm); }

.sec-fill { fill: var(--accent); fill-opacity: .16; stroke: var(--accent); stroke-width: 2; stroke-linejoin: round; }
.sec-weld-fill { fill: var(--danger); fill-opacity: .55; stroke: none; }
.sec-na { stroke: var(--danger); stroke-width: 1.2; stroke-dasharray: 5 3; }

.result-top .sec-stats { flex: 1 1 240px; margin-bottom: 0; }
.sec-stats .sec-key { background: var(--accent-soft) !important; }
.sec-stats .sec-solved { background: var(--accent) !important; }
.sec-stats .sec-solved dt { color: rgba(255,255,255,.85); }
.sec-stats .sec-solved dd { color: #fff; }
.sec-divider { font-size: .76rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-mute);
  margin: 6px 0 12px; padding-top: 12px; border-top: 1px solid var(--border); }

/* flange mode toggle + dimensions */
.seg-wide { max-width: 360px; margin-bottom: 20px; }
#fl-mat-search { margin-bottom: 8px; }
.fd-hi td { background: var(--accent-soft); font-weight: 600; }

.flange-sketch { width: 100%; max-width: 760px; margin: 0 auto; }
.flange-sketch svg { width: 100%; height: auto; display: block; }
.fs-t { fill: var(--text); font-size: 15px; font-weight: 600; font-family: var(--font); }
.fs-cl { stroke: var(--accent); stroke-width: 1.2; stroke-dasharray: 10 4 3 4; opacity: .8; }
.fs-bolt { stroke: var(--text-mute); stroke-width: 1.4; stroke-dasharray: 6 3; }
.fs-cap { fill: var(--text-mute); font-size: 12px; font-family: var(--font); }
.xs-ext { stroke: var(--text-mute); stroke-width: .8; }

/* shell static head sub-section */
.sub-block { border: 1px dashed var(--border-strong); border-radius: var(--radius-sm); padding: 12px 14px; margin-top: 4px; }
.sub-block .checkbox { margin: 0; padding: 0; }
.sub-block .field:last-child { margin-bottom: 0; }
.sub-block-fields { margin-top: 14px; }
.sec-weld { margin: 4px 0 12px; }
#sections-form .seg { margin-bottom: 12px; }
#sections-form .seg:nth-of-type(2) { margin-bottom: 18px; }

/* ---------------- Tables ---------------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); }
.data-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.data-table th, .data-table td { padding: 10px 14px; text-align: left; white-space: nowrap; }
.data-table thead th {
  position: sticky; top: 0; background: var(--surface-2); color: var(--text-soft);
  font-size: .76rem; text-transform: uppercase; letter-spacing: .04em; font-weight: 700;
  border-bottom: 1px solid var(--border); z-index: 1;
}
.data-table tbody tr { border-bottom: 1px solid var(--border); }
.data-table tbody tr:hover { background: var(--surface-2); }
.data-table td { font-variant-numeric: tabular-nums; }
.data-table .num { text-align: right; }
.data-table .strong { font-weight: 700; }
.sortable { cursor: pointer; user-select: none; }
.sortable:hover { color: var(--accent); }
.sortable.sorted-asc::after { content: " ▲"; font-size: .65em; color: var(--accent); }
.sortable.sorted-desc::after { content: " ▼"; font-size: .65em; color: var(--accent); }

.nps-cell { font-weight: 650; }
.sch-tag {
  display: inline-block; font-size: .76rem; font-weight: 600; padding: 2px 8px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}
.sch-tag.is-plain { background: var(--surface-2); color: var(--text-mute); font-weight: 500; }

.std-tag {
  display: inline-block; font-size: .7rem; font-weight: 700; padding: 2px 7px; border-radius: 6px;
  background: var(--surface-2); color: var(--text-soft); letter-spacing: .02em; white-space: nowrap;
}

.row-btn {
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-soft);
  border-radius: 7px; padding: 4px 10px; font-size: .78rem; font-weight: 600; cursor: pointer; font-family: inherit;
}
.row-btn:hover { border-color: var(--accent); color: var(--accent); }
.remove-btn {
  border: none; background: transparent; color: var(--text-mute); cursor: pointer;
  font-size: 1.2rem; line-height: 1; padding: 2px 6px; border-radius: 6px;
}
.remove-btn:hover { color: var(--danger); background: var(--surface-2); }

/* ---------------- Takeoff ---------------- */
.takeoff-card { margin-top: 4px; }
.takeoff-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.takeoff-head .card-title { margin-bottom: 0; }
.takeoff-actions { display: flex; gap: 8px; }
.takeoff-table tfoot td { padding: 12px 14px; border-top: 2px solid var(--border-strong); font-weight: 600; background: var(--surface-2); }

/* ---------------- Filters ---------------- */
.filters-card { margin-bottom: 18px; }
.filters { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end; }
.filters .field { margin-bottom: 0; }
.checkbox { display: flex; align-items: center; gap: 8px; font-size: .88rem; color: var(--text-soft); cursor: pointer; padding-bottom: 10px; font-weight: 600; }
.checkbox input { width: auto; }
.filters-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.result-count { font-size: .85rem; color: var(--text-mute); font-weight: 600; }

.table-card { padding: 0; overflow: hidden; }
.table-card .table-wrap { max-height: 65vh; overflow-y: auto; }

/* ---------------- Empty / misc ---------------- */
.empty-state { padding: 32px 20px; text-align: center; color: var(--text-mute); font-size: .92rem; }

.app-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 20px clamp(14px, 4vw, 32px); }
.app-footer p { max-width: 1180px; margin: 0 auto; color: var(--text-mute); font-size: .82rem; }

/* ---------------- Toast ---------------- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--surface); padding: 11px 20px; border-radius: 999px;
  font-size: .88rem; font-weight: 600; box-shadow: var(--shadow-md); opacity: 0;
  transition: .25s; z-index: 80; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  .tabs { order: 3; width: 100%; margin: 6px 0 0; justify-content: center; }
  .header-actions { margin-left: auto; }
  .result-stats { grid-template-columns: 1fr; }
}