.diagram-hero { padding: 88px 0 64px; background: linear-gradient(135deg, #0f4d3a, #17664e); color: #fff; }
.diagram-hero .eyebrow, .diagram-hero .lead { color: #fff; }
.diagram-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 32px; align-items: center; }
.diagram-hero h1 { margin: 12px 0 16px; font-size: clamp(36px, 6vw, 72px); line-height: 1.02; }
.sign-card { border: 1px solid rgba(255,255,255,.22); border-radius: 8px; padding: 24px; background: rgba(255,255,255,.12); }
.sign-card h2 { margin: 0 0 10px; font-size: 22px; }
.sign-card p { margin: 0; color: rgba(255,255,255,.84); }
.diagram-layout { display: grid; grid-template-columns: minmax(280px, 360px) minmax(0, 1fr); gap: 22px; align-items: start; max-width: 100%; }
.diagram-panel { min-width: 0; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 16px 40px rgba(15,77,58,.08); }
.input-panel { position: sticky; top: 94px; padding: 18px; }
.diagram-main { display: grid; gap: 22px; min-width: 0; }
.editor-panel, .result-panel { padding: 22px; }
.panel-heading { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.panel-heading span { display: inline-flex; width: 42px; height: 42px; align-items: center; justify-content: center; border-radius: 8px; background: var(--soft); color: var(--primary); font-weight: 900; }
.panel-heading h2 { margin: 0; color: var(--primary); font-size: 24px; }
details { border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-bottom: 12px; background: #fbfdfc; }
summary { cursor: pointer; color: var(--primary); font-weight: 900; }
.form-grid { display: grid; gap: 10px; margin-top: 12px; }
.form-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form-grid.single { grid-template-columns: 1fr; }
.form-grid label, .output-switch label { display: block; margin-bottom: 6px; color: var(--primary); font-size: 13px; font-weight: 900; }
.span-2 { grid-column: 1 / -1; }
.full-btn { width: 100%; margin-top: 10px; }
.diagram-preset-card { display: grid; gap: 10px; margin: 14px 0 16px; padding: 12px; border: 1px solid rgba(217,197,41,.48); border-radius: 8px; background: #fffbe8; }
.diagram-preset-card label { color: var(--primary); font-size: 13px; font-weight: 900; }
.action-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.model-message { margin-top: 12px; color: #8a4b00; font-weight: 800; }
.model-message.ok { color: var(--primary); }
.svg-wrap {
  width: 100%; max-width: 100%; overflow-x: auto; overflow-y: hidden;
  border: 1px solid var(--line); border-radius: 12px;
  background:
    linear-gradient(rgba(15,77,58,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,77,58,.045) 1px, transparent 1px),
    linear-gradient(135deg, #f0f8f5 0%, #fff 60%, #f5faf8 100%);
  background-size: 40px 40px, 40px 40px, auto;
  box-shadow: inset 0 2px 8px rgba(15,77,58,.06), 0 8px 32px rgba(15,77,58,.08);
}
#beamCanvas { display: block; width: 100%; min-width: 620px; min-height: 460px; }
.model-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 14px; }
.model-list article { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: #fbfdfc; }
.model-list h3 { margin: 0 0 8px; color: var(--primary); font-size: 15px; }
.model-list p { margin: 3px 0; color: var(--muted); font-size: 13px; }
.output-switch { display: flex; align-items: end; gap: 12px; margin-bottom: 16px; }
.output-switch .control { width: min(280px, 100%); }
.result-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-bottom: 18px; }
.result-card-small { border: 1px solid var(--line); border-radius: 8px; padding: 14px; background: var(--soft); }
.result-card-small.highlight { background: #fff8d8; border-color: rgba(217,197,41,.8); }
.result-card-small span { display: block; color: var(--muted); font-size: 13px; }
.result-card-small strong { color: var(--primary); font-size: 22px; }
.chart-grid { display: grid; grid-template-columns: 1fr; gap: 16px; max-width: 100%; }
.chart-card { min-width: 0; border: 1px solid var(--line); border-radius: 10px; padding: 18px; height: 360px; min-height: 360px; background: linear-gradient(135deg,#fff,#f8fcfa); box-shadow: 0 4px 20px rgba(15,77,58,.06); }
.chart-card canvas { max-height: 290px; }
.combined-chart-card { height: 420px; min-height: 420px; }
.combined-chart-card canvas { max-height: 350px; }
.chart-card h3 { margin: 0 0 12px; color: var(--primary); }
.table-wrap { overflow-x: auto; margin-top: 18px; border: 1px solid var(--line); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; min-width: 980px; }
th, td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
th { background: var(--soft); color: var(--primary); }
/* ── Beam diagram SVG elements ── */
.diagram-node-ring { fill: rgba(255,255,255,.92); stroke: rgba(15,77,58,.2); stroke-width: 3; }
.diagram-node { fill: #fff; stroke: #0f4d3a; stroke-width: 3; filter: drop-shadow(0 3px 6px rgba(15,77,58,.28)); }
.diagram-node-online { fill: #e8f9f1; }
.diagram-element-glow { stroke: rgba(15,77,58,.1); stroke-width: 34; stroke-linecap: round; }
.diagram-element-shadow { stroke: rgba(12,47,38,.18); stroke-width: 19; stroke-linecap: round; filter: drop-shadow(0 8px 9px rgba(15,77,58,.18)); }
.diagram-element-edge { stroke: url(#beamEdgeGrad); stroke-width: 21; stroke-linecap: round; opacity: .9; }
.diagram-element { stroke: url(#beamGrad); stroke-width: 15; stroke-linecap: round; }
.diagram-element-highlight { stroke: rgba(255,255,255,.78); stroke-width: 3; stroke-linecap: round; }
.diagram-element-cap { fill: #e6f2ee; stroke: #0f4d3a; stroke-width: 2.4; filter: drop-shadow(0 2px 4px rgba(15,77,58,.2)); }
.diagram-element-label-bg { fill: rgba(255,255,255,.94); stroke: rgba(15,77,58,.24); stroke-width: 1; filter: drop-shadow(0 1px 3px rgba(0,0,0,.12)); }
.diagram-element-label { fill: #0f4d3a; font-size: 12px; font-weight: 900; }
.diagram-load { stroke: #c93434; stroke-width: 4; stroke-linecap: round; filter: drop-shadow(0 2px 4px rgba(201,52,52,.24)); }
.diagram-hload { stroke: #6b4fd8; stroke-width: 4; stroke-linecap: round; filter: drop-shadow(0 2px 4px rgba(107,79,216,.22)); }
.diagram-udl-band { fill: url(#udlBandGrad); stroke: rgba(214,122,0,.12); stroke-width: 1; }
.diagram-udl { stroke: #d67a00; stroke-width: 3.3; marker-end: url(#arrowOrange); filter: drop-shadow(0 2px 3px rgba(214,122,0,.2)); }
.diagram-udl-top { stroke: #d67a00; stroke-width: 4; stroke-linecap: round; }
.diagram-udl-base { stroke: rgba(214,122,0,.32); stroke-width: 1.4; stroke-dasharray: 5 5; }
.diagram-load-head { fill: #c93434; stroke: #fff; stroke-width: 1.2; filter: drop-shadow(0 2px 3px rgba(201,52,52,.24)); }
.diagram-hload-head { fill: #6b4fd8; stroke: #fff; stroke-width: 1.2; filter: drop-shadow(0 2px 3px rgba(107,79,216,.22)); }
.diagram-load-seat { stroke: #c93434; stroke-width: 4; stroke-linecap: round; }
.diagram-load-anchor { fill: #fff; stroke: #c93434; stroke-width: 2.6; }
.diagram-support-group { filter: drop-shadow(0 3px 5px rgba(15,77,58,.2)); }
.diagram-support { fill: #d9c529; stroke: #0f4d3a; stroke-width: 2.4; }
.diagram-support-cap { stroke: #0f4d3a; stroke-width: 4; stroke-linecap: round; }
.diagram-ground-line { stroke: #0f4d3a; stroke-width: 3; stroke-linecap: round; }
.diagram-ground-hatch, .diagram-fixed-hatch { stroke: rgba(15,77,58,.72); stroke-width: 1.5; stroke-linecap: round; }
.diagram-support-type { fill: #0f4d3a; font-size: 8px; font-weight: 900; text-anchor: middle; letter-spacing: .08em; }
.diagram-roller { fill: #fffef3; stroke: #0f4d3a; stroke-width: 2; }
.diagram-fixed-wall { fill: #d9c529; stroke: #0f4d3a; stroke-width: 2.6; filter: drop-shadow(0 3px 5px rgba(15,77,58,.24)); }
.diagram-fixed-face { stroke: #0f4d3a; stroke-width: 4; stroke-linecap: round; }
.diagram-label { fill: #17231f; font-size: 14px; font-weight: 800; }
.diagram-load-label { font-size: 12px; font-weight: 900; }
.diagram-label-bg { fill: rgba(255,255,255,.97); stroke: rgba(201,52,52,.28); rx: 6; filter: drop-shadow(0 2px 5px rgba(0,0,0,.12)); }
.diagram-label-bg.orange { stroke: rgba(214,122,0,.36); }
.diagram-node-label { fill: #0f4d3a; font-size: 16px; font-weight: 900; text-anchor: middle; }
.diagram-dim-label { fill: #17231f; font-size: 12px; font-weight: 800; text-anchor: middle; }
.diagram-axis-label { fill: #6b7d77; font-size: 12px; font-weight: 800; }
.diagram-dim-line { stroke: #0f4d3a; stroke-width: 1.2; stroke-dasharray: 4 3; opacity: .5; }
.diagram-end-val { font-size: 11px; font-weight: 900; text-anchor: middle; }
@media (max-width: 1280px) { .diagram-layout { grid-template-columns: 1fr; } .input-panel { position: static; } }
@media (max-width: 980px) { .diagram-hero-grid, .chart-grid { grid-template-columns: 1fr; } .model-list, .result-grid { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .diagram-hero { padding-top: 56px; } .form-grid.two, .action-row, .output-switch { grid-template-columns: 1fr; display: grid; } .editor-panel, .result-panel, .input-panel { padding: 14px; } #beamCanvas { min-width: 520px; } .chart-card, .combined-chart-card { height: 320px; min-height: 320px; } .chart-card canvas, .combined-chart-card canvas { max-height: 250px; } }