/* ═══════════════════════════════════════════════════════════════════════
   Rhino Plastics — Canopy Designer
   Design tokens + light / dark theme
   ═══════════════════════════════════════════════════════════════════════ */

/* ─── Brand & shared tokens ─────────────────────────────────────────────── */
:root {
  --accent: #c8102e;
  --accent-hover: #a00d24;
  --accent-light: rgba(200, 16, 46, 0.1);
  --accent-text: #ffffff;

  --font: "Segoe UI", "Inter", Tahoma, Geneva, Verdana, sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --trans: 0.18s ease;
}

/* ─── Dark theme (default) ────────────────────────────────────────────────
   Overridden by [data-theme="light"] below.
   ─────────────────────────────────────────────────────────────────────── */
:root,
[data-theme="dark"] {
  color-scheme: dark;

  --bg: #121212;
  --surface: #1c1c1c;
  --surface-2: #252525;
  --border: #2e2e2e;
  --border-2: #3c3c3c;

  --text: #f0f0f0;
  --text-muted: #888888;
  --text-dim: #444444;

  --input-bg: #181818;
  --input-border: #363636;

  --card-bg: #1e1e1e;
  --result-bg: #161616;
  --table-head: #1a1a1a;
  --table-stripe: #161616;
  --table-border: #2e2e2e;

  --header-bg: #161616;
  --header-border: #272727;

  --tab-idle: #606060;
  --tab-hover-bg: #252525;

  --canvas-section-bg: #181818;
  --canvas-section-border: #2a2a2a;
  --view-label-color: #555555;

  --note-border: #272727;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.55);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.45);

  /* Symbol accent colours */
  --sym: #e8a87c;
  --sym-ground: #7dce82;
  --sym-spacing: #c49fe0;
  --sym-elastic: #ff9f80;
  --sym-result: #7ed9d9;

  --canvas3d-bg: #111111;
}

/* ─── Light theme ─────────────────────────────────────────────────────── */
[data-theme="light"] {
  color-scheme: light;

  --bg: #f0f0f0;
  --surface: #ffffff;
  --surface-2: #f6f6f6;
  --border: #e0e0e0;
  --border-2: #cccccc;

  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --text-dim: #bbbbbb;

  --input-bg: #ffffff;
  --input-border: #d4d4d4;

  --card-bg: #f7f7f7;
  --result-bg: #efefef;
  --table-head: #f4f4f4;
  --table-stripe: #fafafa;
  --table-border: #e8e8e8;

  --header-bg: #ffffff;
  --header-border: #e4e4e4;

  --tab-idle: #909090;
  --tab-hover-bg: #f5f5f5;

  --canvas-section-bg: #ffffff;
  --canvas-section-border: #e2e2e2;
  --view-label-color: #999999;

  --note-border: #ebebeb;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.07);

  --sym: #b5601a;
  --sym-ground: #2d8a2d;
  --sym-spacing: #7a3b9a;
  --sym-elastic: #c04a20;
  --sym-result: #1a7a7a;

  --canvas3d-bg: #111111;
}

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

/* ─── Base ────────────────────────────────────────────────────────────── */
html {
  height: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition:
    background var(--trans),
    color var(--trans);
}

/* ─── App Header ──────────────────────────────────────────────────────── */
.app-header {
  width: 100%;
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  transition:
    background var(--trans),
    border-color var(--trans);
}

.app-header__inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 28px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
  flex-shrink: 0;
}

.app-header__logo {
  height: 34px;
  width: auto;
  display: block;
}

.app-header__divider {
  width: 1px;
  height: 26px;
  background: var(--border-2);
  flex-shrink: 0;
}

.app-header__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

/* ─── Theme toggle ────────────────────────────────────────────────────── */
#themeToggle {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px 6px 10px;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background var(--trans),
    border-color var(--trans),
    color var(--trans);
}

#themeToggle:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

#themeToggle svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* ─── Page body wrapper ───────────────────────────────────────────────── */
.app-body {
  width: 100%;
  max-width: 1440px;
  padding: 26px 28px 48px;
  flex: 1;
}

/* ─── Tab nav ─────────────────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  gap: 0;
  margin-bottom: 26px;
  border-bottom: 2px solid var(--border);
}

.tab-btn {
  background: transparent;
  color: var(--tab-idle);
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  padding: 11px 26px;
  font-size: 0.88rem;
  font-family: var(--font);
  font-weight: 500;
  cursor: pointer;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 7px;
  transition:
    color var(--trans),
    border-color var(--trans),
    background var(--trans);
}

.tab-btn:hover {
  color: var(--text);
  background: var(--tab-hover-bg);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.tab-content {
  display: none;
  width: 100%;
}

.tab-content.active {
  display: block;
}

/* ─── Two-column layout ───────────────────────────────────────────────── */
.layout {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: flex-start;
  width: 100%;
}

/* ─── Panel (left sidebar) ────────────────────────────────────────────── */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 22px 24px;
  min-width: 278px;
  max-width: 320px;
  flex: 0 0 auto;
  box-shadow: var(--shadow-sm);
  transition:
    background var(--trans),
    border-color var(--trans);
}

.panel h2 {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 14px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--border);
}

/* ─── Input group ─────────────────────────────────────────────────────── */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.field--row {
  flex-direction: row;
  align-items: center;
  gap: 10px;
}

.field--row label {
  margin: 0;
  cursor: pointer;
  user-select: none;
}

label {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

label span.sym {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--sym);
  margin-right: 3px;
  font-style: italic;
}

label span.sym.ground {
  color: var(--sym-ground);
}
label span.sym.spacing {
  color: var(--sym-spacing);
}
label span.sym.elastic {
  color: var(--sym-elastic);
}

input[type="number"] {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.97rem;
  font-weight: 500;
  padding: 8px 11px;
  outline: none;
  width: 100%;
  transition:
    border-color var(--trans),
    box-shadow var(--trans),
    background var(--trans);
}

input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* hide browser spinner arrows — we use custom ± buttons */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}
input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* ── Custom spinner (± buttons + unit label) ─────────────────────────── */
.spinner {
  display: flex;
  align-items: stretch;
}

.spinner input[type="number"] {
  flex: 1;
  width: auto;
  min-width: 0;
  text-align: center;
  border-radius: 0;
  border-left: none;
  border-right: none;
}

.spin-btn {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1;
  width: 30px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition:
    background var(--trans),
    color var(--trans),
    border-color var(--trans);
  user-select: none;
}

.spin-btn--dec {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.spin-btn--inc {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.spin-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.spin-btn:active {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.spinner .unit {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-left: 7px;
  align-self: center;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

input[type="checkbox"] {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ─── Result cards ────────────────────────────────────────────────────── */
.results {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-card {
  background: var(--result-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition:
    background var(--trans),
    border-color var(--trans);
}

.result-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.result-label span.sym {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--sym-result);
  margin-right: 4px;
}

.result-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--sym-result);
  white-space: nowrap;
}

/* ─── Error + note ────────────────────────────────────────────────────── */
.error-msg {
  margin-top: 12px;
  font-size: 0.78rem;
  color: var(--accent);
  min-height: 1.2em;
  font-weight: 500;
}

.note {
  margin-top: 16px;
  font-size: 0.73rem;
  color: var(--text-dim);
  line-height: 1.7;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

/* ─── Divider utility ─────────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 5px 0 16px;
}

/* ─── Diagram area ────────────────────────────────────────────────────── */
.diagrams {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1 1 580px;
  min-width: 0;
}

.canvas-section {
  background: var(--canvas-section-bg);
  border: 1px solid var(--canvas-section-border);
  border-radius: var(--radius-lg);
  padding: 13px 16px 16px;
}

.canvas-section canvas {
  background: #181818; /* diagrams are drawn on dark; keep pixel area dark in all themes */
  border-radius: var(--radius-md);
}

[data-theme="light"] .canvas-section canvas {
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.15),
    inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.view-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--view-label-color);
  margin-bottom: 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--canvas-section-border);
}

canvas {
  display: block;
  border-radius: var(--radius-sm);
  width: 100%;
  height: auto;
}

/* ─── Materials table ─────────────────────────────────────────────────── */
.mat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
}

.mat-table th {
  background: var(--table-head);
  color: var(--text-muted);
  padding: 9px 13px;
  text-align: left;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--table-border);
}

.mat-section-header td {
  background: var(--table-head);
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 6px 13px;
  border-top: 1px solid var(--table-border);
}

.mat-table th:last-child {
  text-align: right;
}

.mat-table td {
  padding: 9px 13px;
  border-bottom: 1px solid var(--table-border);
  color: var(--text);
  vertical-align: middle;
}

.mat-table tr:last-child td {
  border-bottom: none;
}

.mat-table td.val {
  color: var(--sym-result);
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

.mat-table tr.total-row td {
  background: var(--table-stripe);
}

/* ─── 3D View ─────────────────────────────────────────────────────────── */
.view3d-layout {
  align-items: stretch;
}

#canvas3d {
  flex: 1 1 580px;
  min-height: 580px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--canvas3d-bg);
  border: 1px solid var(--border);
  position: relative;
}

#canvas3d canvas {
  display: block;
}

#fsBtn {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 10;
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition:
    background var(--trans),
    border-color var(--trans),
    color var(--trans);
}

#fsBtn:hover {
  background: rgba(200, 16, 46, 0.75);
  border-color: rgba(200, 16, 46, 0.9);
  color: #ffffff;
}

#fsBtn svg {
  width: 17px;
  height: 17px;
  pointer-events: none;
}

#canvas3d:fullscreen,
#canvas3d:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  border-radius: 0;
}

/* ─── Legend ──────────────────────────────────────────────────────────── */
.legend {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 7px;
}

.swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.panel h2 + .legend,
.panel h2 ~ .legend:first-of-type {
  margin-top: 0;
}

.panel h2:not(:first-child) {
  margin-top: 22px;
}
@media (max-width: 700px) {
  .app-header__inner {
    padding: 0 16px;
  }
  .app-header__title {
    display: none;
  }
  .app-body {
    padding: 16px 14px 32px;
  }
  .tab-btn {
    padding: 10px 14px;
    font-size: 0.82rem;
  }
  .panel {
    max-width: 100%;
    min-width: 0;
  }
}