/* ============================================================
   ENV — Interactive Lake Phosphorus Management guide
   Site-token re-skin of the Tailwind original. Depends on
   tokens.css, main.css, subpage.css, guide.css. Adds no new
   brand colors; the low/mid/high table tints are data tints
   for Byran's comparison heat map, not status messaging.
   ============================================================ */

/* ---- in-page section nav (sticky under the site nav) ---- */
.lakep-nav {
    position: sticky;
    top: var(--nav-h);
    z-index: 40;
    background: rgba(2, 6, 23, 0.82);
    backdrop-filter: var(--blur-glass);
    -webkit-backdrop-filter: var(--blur-glass);
    border-bottom: 1px solid var(--overlay-border-weak);
}
.lakep-nav__inner {
    max-width: var(--content-max, 1120px);
    margin: 0 auto;
    padding: var(--s-3) var(--s-6);
    display: flex;
    gap: var(--s-2);
    flex-wrap: wrap;
    align-items: center;
}
.lakep-nav__label {
    font-size: var(--label-xs-size, 0.7rem);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--fg-5);
    margin-right: var(--s-2);
}
.lakep-nav__link {
    color: var(--fg-3);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    transition: color var(--duration-fast) var(--ease-standard),
                background var(--duration-fast) var(--ease-standard),
                border-color var(--duration-fast) var(--ease-standard);
}
.lakep-nav__link:hover,
.lakep-nav__link.is-active {
    color: var(--fg-1);
    background: var(--overlay-weak);
    border-color: var(--overlay-border-medium);
}

/* ---- sections ---- */
.lakep-section {
    padding: var(--s-8) 0;
    scroll-margin-top: 110px;
}
.lakep-section--alt { background: var(--surface-elevated); }
.lakep-inner {
    max-width: var(--content-max, 1120px);
    margin: 0 auto;
    padding: 0 var(--s-6);
}
.lakep-head { text-align: center; max-width: 780px; margin: 0 auto var(--s-6); }
.lakep-head h1 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--fg-1);
    margin: 0 0 var(--s-3);
}
.lakep-head h2 {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--fg-1);
    margin: 0 0 var(--s-3);
}
.lakep-head p {
    color: var(--fg-3);
    font-size: 1.08rem;
    line-height: 1.65;
    margin: 0;
}
.lakep-head p + p { margin-top: var(--s-4); color: var(--fg-2); }
.lakep-head em { font-style: italic; }
.lakep-head strong { font-weight: 600; }

/* ---- cards ---- */
.lakep-grid {
    display: grid;
    gap: var(--s-5);
    margin-top: var(--s-6);
}
.lakep-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.lakep-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.lakep-card {
    background: var(--surface-raised);
    border: 1px solid var(--overlay-border-weak);
    border-radius: var(--radius-md);
    padding: var(--s-5);
    color: var(--fg-3);
    font-size: 0.95rem;
    line-height: 1.6;
    transition: transform var(--duration-base) var(--ease-standard),
                border-color var(--duration-base) var(--ease-standard);
}
.lakep-card:hover { transform: translateY(-2px); border-color: var(--overlay-border-medium); }
.lakep-card--block { margin-top: var(--s-6); }
.lakep-card h3 {
    color: var(--fg-1);
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 var(--s-3);
}
.lakep-card h3.is-center { text-align: center; }
.lakep-card h4 {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin: var(--s-4) 0 var(--s-2);
    color: var(--fg-2);
}
.lakep-card p { margin: 0 0 var(--s-3); }
.lakep-card p:last-child { margin-bottom: 0; }
.lakep-card .lakep-sub {
    color: var(--fg-5);
    font-size: 0.8rem;
    margin: -6px 0 var(--s-3);
}
.lakep-card--al    { border-top: 3px solid var(--brand-blue-light); }
.lakep-card--pac   { border-top: 3px solid var(--status-warning); }
.lakep-card--ach   { border-top: 3px solid var(--status-success); }
.lakep-card--lmb   { border-top: 3px solid var(--status-success); }
.lakep-card--con   { border-top: 3px solid var(--status-danger); }
.lakep-card--combo { border-top: 3px solid var(--fg-2); }

/* ---- badges ---- */
.lakep-badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: var(--s-3);
    color: #ffffff;
}
.lakep-badge--al    { background: var(--brand-blue); }
.lakep-badge--lmb   { background: #15803d; }
.lakep-badge--combo { background: var(--surface-base); border: 1px solid var(--overlay-border-strong); }

/* ---- pro / con lists ---- */
.lakep-list { list-style: none; margin: 0; padding: 0; }
.lakep-list li { padding: 4px 0 4px 1.4em; position: relative; }
.lakep-list li::before { position: absolute; left: 0; font-weight: 700; }
.lakep-list--pro li::before { content: "\2713"; color: var(--status-success); }
.lakep-list--con li::before { content: "\2717"; color: var(--status-danger); }
.lakep-list--plain li::before { content: "\2022"; color: var(--fg-5); }
.lakep-list strong { color: var(--fg-2); font-weight: 600; }
.lakep-h-pro { color: var(--status-success); }
.lakep-h-con { color: var(--status-danger); }

/* ---- convergence panel ---- */
.lakep-converge {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--s-4);
}
.lakep-converge__item {
    text-align: center;
    padding: var(--s-4);
    border-radius: var(--radius-sm);
    background: var(--overlay-weak);
    border-left: 4px solid var(--overlay-border-strong);
}
.lakep-converge__item h4 { margin: 0 0 4px; color: var(--fg-1); font-size: 1rem; }
.lakep-converge__item p { margin: 0; font-style: italic; color: var(--fg-4); font-size: 0.9rem; }
.lakep-converge__item--al  { border-left-color: var(--brand-blue-light); }
.lakep-converge__item--pac { border-left-color: var(--status-warning); }
.lakep-converge__item--ach { border-left-color: var(--status-success); }
.lakep-converge__arrow { text-align: center; color: var(--brand-blue-light); font-size: 1.6rem; margin: var(--s-3) 0; }
.lakep-converge__result {
    text-align: center;
    padding: var(--s-4);
    border-radius: var(--radius-sm);
    background: var(--brand-blue-tint);
    border: 1px solid var(--brand-blue-rule);
}
.lakep-converge__result p:first-child { color: var(--fg-1); font-weight: 700; font-size: 1.05rem; }
.lakep-converge__result p:last-child { color: var(--fg-4); font-style: italic; font-size: 0.9rem; }

/* ---- tables ---- */
.lakep-table-wrap { overflow-x: auto; }
.lakep-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    min-width: 640px;
}
.lakep-table th, .lakep-table td {
    padding: var(--s-3);
    border-bottom: 1px solid var(--overlay-border-weak);
    text-align: center;
    vertical-align: middle;
}
.lakep-table th { color: var(--fg-1); font-weight: 600; border-bottom: 2px solid var(--overlay-border-medium); }
.lakep-table th:first-child, .lakep-table td:first-child { text-align: left; }
.lakep-table td:first-child { color: var(--fg-2); font-weight: 500; }
.lakep-table td.is-note { font-style: italic; color: var(--fg-4); }
.lakep-table .th-al  { color: #93c5fd; }
.lakep-table .th-pac { color: #fcd34d; }
.lakep-table .th-ach { color: #86efac; }
.lakep-table .th-lmb { color: #86efac; }
.lakep-table .th-combo { color: var(--fg-1); }
.cell-low  { background: rgba(40, 199, 111, 0.14); color: #bbf7d0; }
.cell-mid  { background: rgba(245, 158, 11, 0.14); color: #fde68a; }
.cell-high { background: rgba(239, 68, 68, 0.14); color: #fecaca; }
.cell-low small, .cell-high small { font-size: 0.75em; opacity: 0.85; }

/* ---- chart ---- */
.chart-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    height: 320px;
}
@media (min-width: 768px) { .chart-container { height: 380px; } }

/* ---- reaction strip ---- */
.lakep-reaction {
    margin: var(--s-4) 0;
    padding: var(--s-3);
    border-radius: var(--radius-sm);
    background: rgba(40, 199, 111, 0.10);
    border: 1px solid rgba(40, 199, 111, 0.35);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--fg-2);
}
.lakep-reaction strong { color: var(--fg-1); }

/* ---- product notes ---- */
.lakep-product { border-left: 4px solid var(--status-success); padding: var(--s-2) 0 var(--s-2) var(--s-4); margin-bottom: var(--s-4); }
.lakep-product h4 { margin: 0 0 4px; color: var(--fg-1); font-size: 1rem; }
.lakep-product p { margin: 0; font-size: 0.9rem; }
.lakep-product-note { font-size: 0.8rem; color: var(--fg-5); font-style: italic; margin: 0; }

/* ---- pH window bars ---- */
.lakep-ph { max-width: 760px; margin: 0 auto; }
.lakep-ph__axis {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    margin: 0 0 8px 200px;
    font-size: 12px;
    color: var(--fg-4);
    font-weight: 500;
}
.lakep-ph__axis div { text-align: center; }
.lakep-ph__row { display: flex; align-items: center; margin-bottom: 14px; }
.lakep-ph__row:last-child { margin-bottom: 0; }
.lakep-ph__name { width: 200px; flex-shrink: 0; font-size: 14px; font-weight: 600; }
.lakep-ph__name--al { color: #93c5fd; }
.lakep-ph__name--lmb { color: #86efac; }
.lakep-ph__track {
    flex: 1;
    position: relative;
    height: 32px;
    background: var(--overlay-medium);
    border-radius: 16px;
    overflow: hidden;
}
.lakep-ph__fill { position: absolute; top: 0; height: 100%; }
.lakep-ph__fill--al { left: 33.3%; width: 33.3%; background: var(--brand-blue-light); }
.lakep-ph__fill--lmb { left: 16.7%; width: 83.3%; background: #16a34a; }
.lakep-ph__label {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    font-weight: 600;
    color: #ffffff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}
.lakep-note {
    margin: var(--s-5) auto 0;
    max-width: 760px;
    text-align: center;
    font-size: 0.9rem;
    font-style: italic;
    color: var(--fg-4);
    line-height: 1.6;
}

/* ---- callout ---- */
.lakep-callout {
    margin: var(--s-6) auto 0;
    max-width: 880px;
    padding: var(--s-5);
    border-radius: var(--radius-md);
    background: var(--brand-blue-tint);
    border-left: 4px solid var(--brand-blue-light);
    color: var(--fg-2);
    font-size: 0.95rem;
    line-height: 1.65;
}
.lakep-callout strong { color: var(--fg-1); }

/* ---- decision flowchart ---- */
.lakep-flow { display: flex; flex-direction: column; align-items: center; gap: var(--s-7); margin-top: var(--s-6); }
.lakep-flow__step {
    position: relative;
    width: 100%;
    max-width: 480px;
    text-align: center;
    padding: var(--s-4);
    border-radius: var(--radius-md);
    background: var(--brand-blue-tint);
    border: 2px solid var(--brand-blue-rule);
    color: var(--fg-1);
}
.lakep-flow__step--wide { max-width: 820px; }
.lakep-flow__step--decision { background: rgba(245, 158, 11, 0.10); border-color: rgba(245, 158, 11, 0.45); }
.lakep-flow__step h4 { margin: 0 0 4px; font-size: 1rem; font-weight: 700; }
.lakep-flow__step p { margin: 0; font-size: 0.9rem; color: var(--fg-3); }
.lakep-flow__step--arrow::after {
    content: "\25BC";
    position: absolute;
    left: 50%;
    bottom: -30px;
    transform: translateX(-50%);
    color: var(--brand-blue-light);
    font-size: 1.3rem;
}
.lakep-branches {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--s-5);
    width: 100%;
}
.lakep-branch h3 {
    text-align: center;
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 var(--s-4);
}
.lakep-branch--al h3 { color: #93c5fd; }
.lakep-branch--lmb h3 { color: #86efac; }
.lakep-branch--combo h3 { color: var(--fg-1); }
.lakep-branch .lakep-card { font-size: 0.9rem; }
.lakep-branch h4 { color: var(--fg-1); margin-top: var(--s-4); }
.lakep-branch h4:first-child { margin-top: 0; }

/* ---- sources ---- */
.lakep-sources {
    max-width: var(--content-max, 1120px);
    margin: 0 auto;
    padding: var(--s-6) var(--s-6) var(--s-8);
    text-align: center;
    color: var(--fg-4);
    font-size: 0.9rem;
    line-height: 1.6;
}
.lakep-sources a { color: var(--brand-blue-light); }
.lakep-sources small { display: block; margin-top: var(--s-2); color: var(--fg-5); font-size: 0.78rem; }

/* ---- responsive ---- */
@media (max-width: 900px) {
    .lakep-grid--3, .lakep-branches, .lakep-converge { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .lakep-grid--2 { grid-template-columns: 1fr; }
    .lakep-section { padding: var(--s-7) 0; }
    .lakep-inner, .lakep-nav__inner { padding-left: 16px; padding-right: 16px; }
    .lakep-ph__axis { margin-left: 0; }
    .lakep-ph__row { flex-direction: column; align-items: stretch; gap: 6px; }
    .lakep-ph__name { width: auto; }
    .lakep-nav__label { display: none; }
}