/* ============================================================
   OLS CALCULATOR — SHARED THEME  (Material Design 3 / Geist)
   ============================================================ */

:root {
    --clr-primary:               #4b626a;
    --clr-on-primary:            #ffffff;
    --clr-primary-fixed:         #cee7f0;
    --clr-primary-fixed-dim:     #b2cad3;
    --clr-primary-container:     #aec6cf;
    --clr-secondary:             #505f76;
    --clr-secondary-container:   #d0e1fb;
    --clr-secondary-fixed:       #d3e4fe;
    --clr-secondary-fixed-dim:   #b7c8e1;
    --clr-tertiary:              #5c5f61;
    --clr-tertiary-container:    #c0c2c4;
    --clr-error:                 #ba1a1a;
    --clr-error-container:       #ffdad6;
    --clr-bg:                    #faf9f9;
    --clr-surface:               #faf9f9;
    --clr-surface-bright:        #faf9f9;
    --clr-surface-dim:           #dbdada;
    --clr-surface-container-lowest: #ffffff;
    --clr-surface-container-low: #f5f3f3;
    --clr-surface-container:     #efedee;
    --clr-surface-container-high:#e9e8e8;
    --clr-surface-container-highest:#e3e2e2;
    --clr-surface-variant:       #e3e2e2;
    --clr-on-surface:            #1b1c1c;
    --clr-on-surface-variant:    #42484a;
    --clr-outline:               #72787a;
    --clr-outline-variant:       #c2c7ca;
    --clr-ok:                    #1a8a3e;
    --clr-ok-bg:                 #d6f0e0;
    --clr-warn:                  #7c5200;
    --clr-warn-bg:               #fef3cd;
    --shadow-sm: 0 1px 4px rgba(0,0,0,.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,.10);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Geist', 'Inter', system-ui, sans-serif;
    background-color: var(--clr-bg);
    color: var(--clr-on-surface);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── TOPNAV ─────────────────────────────────────────────── */
.topnav {
    position: sticky;
    top: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 24px;
    height: 64px;
    background: rgba(250,249,249,.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--clr-outline-variant);
    box-shadow: var(--shadow-sm);
}

.topnav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 17px;
    color: var(--clr-primary);
}

.topnav-brand-icon {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-sm);
    background: var(--clr-primary-fixed);
    color: var(--clr-primary);
}

.topnav-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    min-height: 40px;
    border: 1px solid var(--clr-outline-variant);
    border-radius: var(--radius-sm);
    background: var(--clr-surface-container-lowest);
    color: var(--clr-on-surface);
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, box-shadow .15s, transform .12s;
}

.btn:hover { background: var(--clr-surface-container); box-shadow: var(--shadow-sm); }
.btn:active { transform: scale(.97); }

.btn-primary {
    background: var(--clr-primary);
    border-color: var(--clr-primary);
    color: var(--clr-on-primary);
    box-shadow: 0 2px 8px rgba(75,98,106,.25);
}

.btn-primary:hover { background: #3d5059; box-shadow: 0 4px 14px rgba(75,98,106,.35); }

.btn-teal {
    background: #0f766e;
    border-color: #0f766e;
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: var(--clr-on-surface-variant);
}

.btn-ghost:hover { background: var(--clr-surface-container); }

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-sm);
}

/* ── CARD ─────────────────────────────────────────────────── */
.card {
    background: var(--clr-surface-container-lowest);
    border: 1px solid var(--clr-surface-variant);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    overflow-wrap: break-word;
    max-width: 100%;
    overflow-x: hidden;
}

.card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.card-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--clr-on-surface);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--clr-primary);
    margin-bottom: 4px;
}

.card-note {
    font-size: 13px;
    color: var(--clr-on-surface-variant);
}

/* ── FORM CONTROLS ─────────────────────────────────────────── */
.field { display: grid; gap: 6px; }

.field label, .label {
    font-size: 13px;
    font-weight: 700;
    color: var(--clr-on-surface);
}

select,
textarea,
input[type="number"],
input[type="text"] {
    width: 100%;
    border: 1px solid var(--clr-outline-variant);
    border-radius: var(--radius-sm);
    background: var(--clr-surface-container-low);
    color: var(--clr-on-surface);
    font: inherit;
    font-size: 14px;
    padding: 10px 12px;
    outline: none;
    transition: border-color .15s, box-shadow .15s, background .15s;
    appearance: none;
}

textarea { min-height: 148px; resize: vertical; }

select:focus,
textarea:focus,
input:focus {
    border-color: var(--clr-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(75,98,106,.12);
}

/* Custom select arrow */
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24'%3E%3Cpath fill='%2372787a' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
}

/* ── TABLES ─────────────────────────────────────────────────── */
.table-wrap {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--clr-outline-variant);
    border-radius: var(--radius-md);
    background: var(--clr-surface-container-lowest);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
    font-size: 14px;
}

th {
    background: var(--clr-surface-container-low);
    color: var(--clr-on-surface-variant);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    padding: 10px 12px;
    border-bottom: 1px solid var(--clr-outline-variant);
    text-align: center;
}

td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--clr-surface-container);
    text-align: center;
    color: var(--clr-on-surface);
}

td input { text-align: right; }
tr:last-child td { border-bottom: 0; }
tr:hover td { background: var(--clr-surface-container-low); }

/* ── BADGE ───────────────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge-ok   { background: var(--clr-ok-bg);   color: var(--clr-ok);  }
.badge-fail { background: var(--clr-error-container); color: var(--clr-error); }
.badge-warn { background: var(--clr-warn-bg);  color: var(--clr-warn); }

/* ── STAT METRICS ─────────────────────────────────────────────── */
.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.metric-tile {
    background: var(--clr-surface-container-low);
    border: 1px solid var(--clr-outline-variant);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metric-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--clr-on-surface-variant);
}

.metric-value {
    font-size: 22px;
    font-weight: 600;
    color: var(--clr-primary);
}

/* ── INSIGHT BOX ─────────────────────────────────────────────── */
.insight-box {
    margin-top: 16px;
    padding: 14px 16px;
    background: var(--clr-primary-fixed);
    border-left: 4px solid var(--clr-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 14px;
    line-height: 1.7;
    color: var(--clr-on-surface);
}

.insight-box strong { color: var(--clr-primary); }

/* ── UTILITY ─────────────────────────────────────────────────── */
.muted { color: var(--clr-on-surface-variant); font-size: 13px; }
.over  { text-decoration: overline; }

.icon { font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24; }
.icon.fill { font-variation-settings: 'FILL' 1; }

.row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

/* Loading spinner */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
    width: 16px; height: 16px;
    border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}

/* Fix MathJax overflow on mobile */
mjx-container[display="true"] {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    max-width: 100%;
    padding-bottom: 4px; /* for scrollbar spacing */
}

/* ── RESPONSIVE ──────────────────────────────────────────────── */
@media (max-width: 880px) {
    .metric-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
    .topnav { padding: 0 14px; }
    .topnav-subtitle { display: none; }
    .topnav-brand-text > div:first-child { font-size: 14px !important; }
    .topnav-actions .btn { padding: 0; width: 36px; height: 36px; min-height: unset; justify-content: center; }
    .topnav-actions .btn-text { display: none; }
    .metric-grid { grid-template-columns: 1fr 1fr; }
    .card { padding: 16px; }
}

/* ── PRINT ───────────────────────────────────────────────────── */
@media print {
    .no-print { display: none !important; }
    body { background: #fff; }
    .card { box-shadow: none; page-break-inside: avoid; }
}