/* Osmolality Calculator — Stylesheet v1.0 */

.osm-page { display:flex; flex-direction:column; gap:20px; }
.osm-hero { text-align:center; padding:32px 0 8px; }
.osm-hero h1 { font-size:clamp(1.875rem,4vw,2.5rem); font-weight:800; color:var(--color-dark,#0f172a); margin:8px 0 10px; letter-spacing:-0.02em; }
.osm-hero-sub { font-size:var(--text-lg,1.125rem); color:var(--color-text-muted,#64748b); margin:0; }

/* Tabs */
.osm-tabs { display:flex; gap:0; border:1.5px solid var(--color-border,#e2e8f0); border-radius:var(--radius-lg,12px); overflow:hidden; }
.osm-tab { flex:1; padding:12px 20px; font-size:14px; font-weight:600; background:#fff; color:var(--color-text-muted,#64748b); border:none; cursor:pointer; transition:all .15s; text-align:center; }
.osm-tab.active { background:var(--color-primary,#0D7C7C); color:#fff; }
.osm-tab:not(.active):hover { background:var(--color-surface,#f8fafc); }

/* Card */
.osm-card { background:#fff; border:1.5px solid var(--color-border,#e2e8f0); border-radius:var(--radius-lg,12px); overflow:hidden; }
.osm-card-header { padding:14px 20px; border-bottom:1px solid var(--color-border-light,#f1f5f9); background:var(--color-surface,#f8fafc); }
.osm-card-title { display:flex; align-items:center; gap:8px; font-size:13px; font-weight:700; color:var(--color-text,#1e293b); text-transform:uppercase; letter-spacing:.04em; }
.osm-card-title svg { stroke:var(--color-primary,#0D7C7C); }

.osm-form { padding:24px 20px; display:flex; flex-direction:column; gap:20px; }
.osm-form-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.osm-form-grid--2 { grid-template-columns:1fr 1fr; }
.osm-field-group { display:flex; flex-direction:column; gap:6px; }
.osm-field-group label { font-size:14px; font-weight:600; color:var(--color-text,#1e293b); }
.osm-optional { font-size:12px; font-weight:400; color:var(--color-text-muted,#64748b); }
.osm-input-row { display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.osm-input { height:44px; padding:0 14px; border:1.5px solid var(--color-border,#e2e8f0); border-radius:var(--radius,8px); font-size:16px; font-weight:600; color:var(--color-text,#1e293b); background:#fff; transition:border-color .15s; width:140px; min-width:0; }
.osm-input:focus { outline:none; border-color:var(--color-primary,#0D7C7C); box-shadow:0 0 0 3px rgba(13,124,124,.12); }
.osm-unit { font-size:13px; font-weight:600; color:var(--color-text-muted,#64748b); white-space:nowrap; }
.osm-hint { font-size:12px; color:var(--color-text-muted,#64748b); margin:0; line-height:1.5; }

.osm-unit-toggle { display:flex; border:1.5px solid var(--color-border,#e2e8f0); border-radius:6px; overflow:hidden; }
.osm-unit-btn, .osm-unit-btn-bun { padding:8px 10px; font-size:11px; font-weight:700; background:#fff; color:var(--color-text-muted,#64748b); border:none; cursor:pointer; transition:all .15s; white-space:nowrap; }
.osm-unit-btn.active, .osm-unit-btn-bun.active { background:var(--color-primary,#0D7C7C); color:#fff; }

.osm-btn-calc { display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:14px 32px; background:var(--color-primary,#0D7C7C); color:#fff; font-size:15px; font-weight:700; border:none; border-radius:var(--radius,8px); cursor:pointer; width:100%; max-width:340px; align-self:center; }
.osm-btn-calc:hover { background:var(--color-primary-dark,#0a5f5f); }

/* Results */
.osm-result { background:#fff; border:1.5px solid var(--color-border,#e2e8f0); border-radius:var(--radius-lg,12px); overflow:hidden; }
.osm-result-header { display:flex; align-items:center; gap:8px; padding:14px 20px; background:var(--color-surface,#f8fafc); border-bottom:1px solid var(--color-border-light,#f1f5f9); font-size:13px; font-weight:700; color:var(--color-text,#1e293b); text-transform:uppercase; letter-spacing:.04em; }
.osm-result-header svg { stroke:var(--color-primary,#0D7C7C); }

.osm-vals-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); border-bottom:1px solid var(--color-border-light,#f1f5f9); }
.osm-val-box { padding:20px 16px; text-align:center; border-right:1px solid var(--color-border-light,#f1f5f9); }
.osm-val-box:last-child { border-right:none; }
.osm-val-label { font-size:11px; font-weight:700; text-transform:uppercase; letter-spacing:.06em; color:var(--color-text-muted,#64748b); margin-bottom:6px; }
.osm-val-number { font-size:2.2rem; font-weight:900; color:var(--color-dark,#0f172a); line-height:1; margin-bottom:4px; }
.osm-val-unit { font-size:11px; color:var(--color-text-muted,#64748b); margin-bottom:6px; }
.osm-val-badge { display:inline-block; padding:2px 10px; border-radius:20px; font-size:10px; font-weight:800; text-transform:uppercase; }
.osm-badge-normal  { background:#dcfce7; color:#166534; }
.osm-badge-high    { background:#fee2e2; color:#991b1b; }
.osm-badge-low     { background:#fef3c7; color:#92400e; }
.osm-badge-alert   { background:#fee2e2; color:#991b1b; }
.osm-badge-info    { background:#e0f2fe; color:#075985; }

.osm-interp { padding:20px; border-bottom:1px solid var(--color-border-light,#f1f5f9); }
.osm-interp-title { font-size:14px; font-weight:700; color:var(--color-dark,#0f172a); margin-bottom:10px; }
.osm-interp-list { list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:8px; }
.osm-interp-item { padding:10px 14px; border-radius:8px; font-size:14px; color:var(--color-text,#1e293b); line-height:1.6; }
.osm-item-normal { background:#f0fdf4; border-left:3px solid #22c55e; }
.osm-item-warn   { background:#fffbeb; border-left:3px solid #f59e0b; }
.osm-item-alert  { background:#fef2f2; border-left:3px solid #ef4444; }
.osm-item-info   { background:#f0f9ff; border-left:3px solid #38bdf8; }

.osm-actions { padding:20px; background:var(--color-surface,#f8fafc); }
.osm-actions-title { font-size:13px; font-weight:700; text-transform:uppercase; letter-spacing:.04em; color:var(--color-text-muted,#64748b); margin-bottom:12px; }
.osm-action-list { list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:8px; }
.osm-action-item { display:flex; align-items:flex-start; gap:10px; font-size:14px; color:var(--color-text,#1e293b); line-height:1.5; }
.osm-action-item::before { content:'→'; color:var(--color-primary,#0D7C7C); font-weight:700; flex-shrink:0; margin-top:1px; }

/* Formulas */
.osm-formulas { padding:16px 20px; display:flex; flex-direction:column; gap:10px; border-bottom:1px solid var(--color-border-light,#f1f5f9); }
.osm-formula-row { display:flex; gap:12px; align-items:flex-start; flex-wrap:wrap; }
.osm-formula-label { font-size:12px; font-weight:700; color:var(--color-text-muted,#64748b); text-transform:uppercase; letter-spacing:.04em; min-width:130px; flex-shrink:0; padding-top:4px; }
.osm-formula-eq { font-size:13px; color:var(--color-text,#1e293b); font-family:monospace; background:var(--color-surface,#f8fafc); padding:6px 12px; border-radius:6px; flex:1; }
.osm-ref-table-wrap { overflow-x:auto; border-top:1px solid var(--color-border-light,#f1f5f9); }
.osm-ref-table { width:100%; border-collapse:collapse; font-size:12px; }
.osm-ref-table th { padding:9px 14px; background:var(--color-surface,#f8fafc); font-weight:700; color:var(--color-text-muted,#64748b); text-align:left; border-bottom:1px solid var(--color-border,#e2e8f0); font-size:11px; text-transform:uppercase; letter-spacing:.04em; white-space:nowrap; }
.osm-ref-table td { padding:10px 14px; border-bottom:1px solid var(--color-border-light,#f1f5f9); color:var(--color-text,#1e293b); vertical-align:middle; }
.osm-ref-table tr:last-child td { border-bottom:none; }
.osm-ref-note { padding:10px 20px; font-size:11px; color:var(--color-text-muted,#64748b); border-top:1px solid var(--color-border-light,#f1f5f9); }

@media(max-width:600px) {
    .osm-form-grid, .osm-form-grid--2 { grid-template-columns:1fr; }
    .osm-tabs { flex-direction:column; }
    .osm-vals-grid { grid-template-columns:1fr 1fr; }
}