:root {
  color-scheme: dark;
  --bg: #111716;
  --panel: rgba(255, 255, 255, 0.082);
  --panel-strong: rgba(255, 255, 255, 0.14);
  --line: rgba(229, 237, 232, 0.17);
  --text: #f8fbf6;
  --muted: #b8c7c1;
  --terracotta: #c96f43;
  --clay: #8f3f2b;
  --teal: #2fb7a5;
  --river: #0e6f78;
  --gold: #f3bf5b;
  --danger: #f25f5c;
  --ok: #47d18c;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 6%, rgba(201, 111, 67, .27), transparent 24%),
    radial-gradient(circle at 78% 10%, rgba(47, 183, 165, .22), transparent 26%),
    linear-gradient(135deg, #26170f 0%, #123638 46%, #101716 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.7), transparent);
}

#rainCanvas, .atmosphere {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#rainCanvas { z-index: 0; opacity: .62; }
.atmosphere {
  z-index: 0;
  background: linear-gradient(120deg, rgba(255,255,255,.05), transparent 32%, rgba(243,191,91,.08));
  mix-blend-mode: screen;
}

button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
input, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 12px;
  color: var(--text);
  background: rgba(9, 20, 20, .68);
  outline: none;
}

label { display: grid; gap: 7px; color: var(--muted); font-size: .86rem; }
h1, h2, p { margin: 0; }
h1 { font-size: clamp(2.7rem, 7vw, 6.5rem); line-height: .9; letter-spacing: 0; }
h2 { font-size: 1.05rem; letter-spacing: 0; }
small { color: var(--muted); }

.app-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr);
  gap: 18px;
  padding: 18px;
}

.sidebar, .panel, .hero {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.sidebar {
  position: sticky;
  top: 18px;
  height: calc(100vh - 36px);
  border-radius: 8px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.brand { display: flex; align-items: center; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.brand-mark {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--terracotta), var(--gold));
  color: #16100c;
  font-weight: 950;
}
.brand strong, .brand small { display: block; }

.nav { display: grid; gap: 8px; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 12px 13px;
  border: 1px solid transparent;
  border-radius: 8px;
}
.nav a:hover { color: var(--text); background: var(--panel-strong); border-color: var(--line); }
.project-box { margin-top: auto; display: grid; gap: 12px; }

.workspace { display: grid; gap: 18px; min-width: 0; }
.hero {
  position: relative;
  min-height: min(78vh, 720px);
  border-radius: 8px;
  padding: clamp(28px, 6vw, 74px);
  display: grid;
  align-content: end;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 30px;
  overflow: hidden;
}

#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: .88;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(17,23,22,.92) 0%, rgba(17,23,22,.66) 42%, rgba(17,23,22,.22) 100%),
    linear-gradient(0deg, rgba(17,23,22,.86) 0%, transparent 45%);
}

.hero-content,
.hero-kpis {
  position: relative;
  z-index: 1;
}

.eyebrow {
  text-transform: uppercase;
  color: var(--gold);
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .08em;
  margin-bottom: 8px;
}
.hero-copy { max-width: 780px; color: #dce7e1; margin-top: 18px; font-size: 1.05rem; line-height: 1.65; }
.hero-kpis {
  align-self: end;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.hero-kpis span {
  min-height: 112px;
  display: grid;
  align-content: center;
  padding: 15px;
  border-radius: 8px;
  background: rgba(0,0,0,.22);
  border: 1px solid var(--line);
  color: var(--muted);
}
.hero-kpis strong { display: block; color: var(--text); font-size: 1.45rem; }

.module { display: grid; gap: 18px; scroll-margin-top: 18px; }
.hydro-grid { grid-template-columns: minmax(320px, .9fr) minmax(300px, .65fr); }
.section-grid, .reinforce-grid, .report-grid { grid-template-columns: minmax(320px, .95fr) minmax(300px, .75fr); }
.plans-grid { grid-template-columns: minmax(400px, 1fr) minmax(320px, .55fr); }
.panel {
  border-radius: 8px;
  padding: 18px;
  overflow: hidden;
}
.wide { grid-column: 1 / -1; }
.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
}
.switch {
  display: flex;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  margin: 15px 0;
}
.switch input { width: 20px; height: 20px; accent-color: var(--teal); }
.stack, .actions { display: flex; gap: 10px; }
.wrap { flex-wrap: wrap; }
.range-row { margin-top: 14px; }

.primary-btn, .ghost-btn {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 14px;
  font-weight: 850;
}
.primary-btn {
  background: linear-gradient(135deg, var(--terracotta), var(--gold));
  color: #17100b;
  border: 0;
}
.ghost-btn { color: var(--text); background: rgba(255,255,255,.09); }
.file-btn { position: relative; text-align: center; }
.file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.badge {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  padding: 7px 10px;
  border-radius: 999px;
  color: #20140d;
  background: var(--gold);
  font-size: .78rem;
  font-weight: 850;
}
.badge.teal { background: var(--teal); color: #031313; }

.result-panel { display: grid; align-content: center; gap: 18px; }
.result-ring {
  width: 210px;
  height: 210px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at center, #10201e 0 54%, transparent 55%),
    conic-gradient(var(--teal) var(--angle, 40deg), rgba(255,255,255,.12) 0);
}
.result-ring span { font-size: 2.5rem; font-weight: 950; }
.result-ring small { margin-top: -76px; }
.flow-bar { height: 14px; border-radius: 999px; background: rgba(255,255,255,.12); overflow: hidden; }
.flow-bar span { display: block; height: 100%; width: 0%; border-radius: inherit; background: linear-gradient(90deg, var(--teal), var(--gold), var(--danger)); transition: width 450ms ease; }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.metric, .warning, .steel-card, .architecture span {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(0,0,0,.18);
}
.metric strong { display: block; color: var(--text); font-size: 1.25rem; margin-bottom: 3px; }
.metric span, .warning, .steel-card p, .architecture span { color: var(--muted); }
.warnings { display: grid; gap: 9px; }
.warning.critical { border-color: rgba(242,95,92,.48); color: #ffd8d6; }
.warning.ok { border-color: rgba(71,209,140,.45); color: #d9ffe9; }

.chart { width: 100%; height: auto; min-height: 360px; }
.chart text { fill: var(--muted); font-size: 12px; }
.chart .grid { stroke: rgba(255,255,255,.12); }
.chart .curve { fill: none; stroke-width: 3; }
.chart .axis { stroke: rgba(255,255,255,.38); }

.big-result {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}
.big-result .headline {
  font-size: 2rem;
  font-weight: 950;
  color: var(--gold);
}
.json-box {
  margin: 15px 0 0;
  max-height: 330px;
  overflow: auto;
  padding: 14px;
  border-radius: 8px;
  background: rgba(0,0,0,.28);
  border: 1px solid var(--line);
  color: #d5fff7;
}

.steel-list { display: grid; gap: 12px; margin-top: 14px; }
.steel-card strong { display: block; color: var(--text); margin-bottom: 7px; }
.steel-card .steel-line { color: var(--gold); font-weight: 900; }

.manual-steel {
  margin: 16px 0;
  padding: 14px;
  border: 1px solid rgba(47, 183, 165, .28);
  border-radius: 8px;
  background: rgba(47, 183, 165, .08);
}
.manual-steel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.bar-picker {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.manual-steel-check {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.manual-steel-check span {
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.18);
  font-size: .82rem;
  font-weight: 800;
}

.plan-svg {
  width: 100%;
  min-height: 520px;
  border-radius: 8px;
  background: #f7f4ee;
  color: #19211f;
}
#threeCanvas {
  width: 100%;
  aspect-ratio: 1.25;
  border-radius: 8px;
  background: linear-gradient(#dce8e5, #f0eee6);
}

.report-preview {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}
.report-preview article {
  padding: 13px;
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  border: 1px solid var(--line);
}
.architecture { display: grid; gap: 10px; margin-top: 14px; }

@media (max-width: 1180px) {
  .app-shell, .hero, .hydro-grid, .section-grid, .reinforce-grid, .plans-grid, .report-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .nav { grid-template-columns: repeat(5, 1fr); display: grid; }
}

@media (max-width: 720px) {
  .app-shell { padding: 10px; }
  .hero, .panel, .sidebar { padding: 14px; }
  .form-grid, .metric-grid, .hero-kpis, .manual-steel-grid, .manual-steel-check { grid-template-columns: 1fr; }
  .nav { grid-template-columns: repeat(2, 1fr); }
  .stack, .actions { flex-direction: column; }
  h1 { font-size: 3rem; }
}