/* Mermaid ocean theme */
:root {
  --deep: #0b2e3d; --sea: #12475c; --teal: #1d7a8c; --aqua: #4fc3c7; --foam: #d8f3f1;
  --sand: #f6e7c9; --coral: #ff8a70; --gold: #f4c95d; --ink: #10333f; --card: #ffffff;
  --ok: #2e9e7b; --warn: #d97742; --bad: #c94f4f;
}
* { box-sizing: border-box; margin: 0; }
body {
  font-family: 'Segoe UI', 'Avenir Next', system-ui, sans-serif;
  background: linear-gradient(180deg, var(--foam) 0%, #bfe6e4 55%, #9fd6d6 100%);
  color: var(--ink); min-height: 100vh;
}
header {
  background: linear-gradient(180deg, var(--deep), var(--sea));
  color: var(--foam); padding: 18px 28px 0; position: relative; overflow: hidden;
}
.header-inner { display: flex; align-items: center; gap: 18px; max-width: 1100px; margin: 0 auto; }
header h1 { font-size: 1.5rem; font-weight: 600; letter-spacing: 0.4px; }
header .asof { margin-left: auto; font-size: 0.85rem; opacity: 0.85; text-align: right; }
.waves { display: block; margin: 10px auto -1px; width: 100%; max-width: none; }
nav { background: var(--sea); }
.nav-inner { max-width: 1100px; margin: 0 auto; display: flex; gap: 4px; padding: 0 28px; }
nav button {
  background: none; border: none; color: var(--foam); padding: 12px 20px; font-size: 0.95rem;
  cursor: pointer; border-bottom: 3px solid transparent; opacity: 0.75;
}
nav button.active { border-bottom-color: var(--gold); opacity: 1; font-weight: 600; }
nav button:hover { opacity: 1; }
main { max-width: 1100px; margin: 24px auto 80px; padding: 0 28px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border-radius: 14px; padding: 20px 22px;
  box-shadow: 0 3px 14px rgba(11, 46, 61, 0.10);
}
.card h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; color: var(--teal); margin-bottom: 8px; }
.big { font-size: 2rem; font-weight: 700; color: var(--deep); }
.sub { font-size: 0.85rem; color: #4a6b76; margin-top: 4px; }
.delta-up { color: var(--ok); font-weight: 600; }
.delta-down { color: var(--bad); font-weight: 600; }
.section { margin-top: 30px; }
.section > h2 { color: var(--deep); font-size: 1.15rem; margin-bottom: 14px; }
.scenario { margin-bottom: 18px; }
.scenario .head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.scenario .head .pct { margin-left: auto; font-size: 1.6rem; font-weight: 700; color: var(--teal); }
.bar { background: var(--foam); border-radius: 20px; height: 22px; margin: 10px 0 6px; overflow: hidden; position: relative; }
.bar .fill {
  height: 100%; border-radius: 20px;
  background: linear-gradient(90deg, var(--aqua), var(--teal));
  transition: width 0.6s ease; display: flex; align-items: center; justify-content: flex-end;
}
.bar .swimmer { font-size: 15px; margin-right: 2px; transform: scaleX(-1); }
.meta-row { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.85rem; color: #4a6b76; }
details { margin-top: 8px; font-size: 0.85rem; }
details summary { cursor: pointer; color: var(--teal); font-weight: 600; }
details ul { margin: 8px 0 0 18px; color: #445f6b; line-height: 1.5; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid #e3f0ef; }
th { color: var(--teal); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.7px; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.neg { color: var(--bad); }
.badge { font-size: 0.7rem; background: var(--warn); color: white; border-radius: 8px; padding: 2px 7px; margin-left: 6px; }
.badge.ok { background: var(--ok); }
.chart-wrap { height: 300px; }
/* auth */
#auth {
  position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, var(--deep), var(--sea) 70%, var(--teal));
}
#auth .box { background: white; border-radius: 16px; padding: 36px; width: 340px; text-align: center; }
#auth h2 { color: var(--deep); margin: 10px 0 4px; }
#auth p { font-size: 0.85rem; color: #4a6b76; margin-bottom: 16px; }
#auth input {
  width: 100%; padding: 10px 12px; border: 2px solid var(--aqua); border-radius: 8px; font-size: 1rem;
}
#auth button {
  margin-top: 12px; width: 100%; padding: 10px; background: var(--teal); border: none; color: white;
  font-size: 1rem; border-radius: 8px; cursor: pointer;
}
#auth .err { color: var(--bad); font-size: 0.8rem; height: 1em; margin-top: 8px; }
/* upload */
.drop {
  border: 2px dashed var(--teal); border-radius: 14px; padding: 40px; text-align: center;
  background: rgba(255,255,255,0.6); color: var(--sea); cursor: pointer; font-size: 0.95rem;
}
.drop.hover { background: var(--foam); }
.upload-summary { margin-top: 16px; }
button.primary {
  background: var(--teal); color: white; border: none; padding: 10px 22px; border-radius: 8px;
  font-size: 0.95rem; cursor: pointer; margin-top: 12px;
}
button.primary:disabled { opacity: 0.4; cursor: default; }
/* assumptions */
.assump-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.assump { background: white; border-radius: 10px; padding: 12px 14px; }
.assump label { display: block; font-size: 0.78rem; color: var(--teal); font-weight: 600; margin-bottom: 4px; }
.assump input { width: 100%; padding: 7px 9px; border: 1px solid #cde5e3; border-radius: 6px; font-size: 0.92rem; }
.assump .hint { font-size: 0.72rem; color: #6b8894; margin-top: 4px; line-height: 1.35; }
footer { text-align: center; padding: 20px; font-size: 0.78rem; color: var(--sea); }

/* what-if slider */
.whatif-card { margin-bottom: 18px; }
.whatif-row { display: flex; align-items: center; gap: 16px; margin: 10px 0 6px; }
.whatif-row input[type=range] { flex: 1; accent-color: var(--coral); height: 6px; }
.whatif-row strong { color: var(--coral); min-width: 130px; text-align: right; font-size: 1.05rem; }
.whatif-eta { color: var(--coral); font-weight: 600; }