/* ==========================================================================
   HydraulicCalc.Web — engineering-blue theme
   Restores the standard Blazor layout classes (lost in the prototype) and
   layers a cohesive professional look on top.
   ========================================================================== */

:root {
    --hc-primary: #1b6ec2;
    --hc-primary-dark: #15497e;
    --hc-accent: #2c7fb8;
    --hc-sidebar-bg: #15263b;
    --hc-sidebar-bg2: #1d3a5f;
    --hc-sidebar-text: #c9d6e3;
    --hc-sidebar-hover: rgba(255, 255, 255, 0.08);
    --hc-sidebar-active: rgba(44, 127, 184, 0.38);
    --hc-content-bg: #f4f6f9;
    --hc-card-bg: #ffffff;
    --hc-border: #e3e8ee;
    --hc-text: #1f2a37;
    --hc-muted: #6b7785;
}

html, body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--hc-content-bg);
    color: var(--hc-text);
}

h1:focus { outline: none; }

a, .btn-link {
    color: var(--hc-primary);
}

/* ---- Layout (standard Blazor template classes, previously missing) ------ */

.page {
    position: relative;
    display: flex;
    flex-direction: row;
    min-height: 100vh;
}

.sidebar {
    flex: 0 0 320px;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, var(--hc-sidebar-bg) 0%, var(--hc-sidebar-bg2) 100%);
    color: var(--hc-sidebar-text);
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.18);
    z-index: 10;
}

main {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--hc-content-bg);
}

.sidebar .top-row {
    height: 3.5rem;
    background: rgba(0, 0, 0, 0.20);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    flex: 0 0 auto;
    padding-right: 0.75rem;
}

.sidebar .navbar-brand {
    color: #fff;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.15rem rgba(255, 255, 255, 0.25);
}

.nav-scrollable {
    overflow-y: auto;
    flex: 1 1 auto;
    padding-top: 0.5rem;
    padding-bottom: 1rem;
}

.nav-item {
    margin: 1px 0.6rem;
}

    .nav-item ::deep a {
        color: var(--hc-sidebar-text);
        border-radius: 6px;
        padding: 0.55rem 0.9rem;
        display: flex;
        align-items: flex-start;
        line-height: 1.25;
        font-size: 0.9rem;
        white-space: normal;
        word-break: break-word;
        transition: background-color .15s ease, color .15s ease;
    }

        .nav-item ::deep a:hover {
            background: var(--hc-sidebar-hover);
            color: #fff;
        }

        .nav-item ::deep a.active {
            background: var(--hc-sidebar-active);
            color: #fff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--hc-accent);
        }

.nav-group-title {
    font-weight: 700;
    color: #7f93ab;
    font-size: 0.7rem;
    margin: 0.9rem 0.8rem 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* Main content top bar */
main > .top-row {
    height: 3.5rem;
    background: var(--hc-card-bg);
    border-bottom: 1px solid var(--hc-border);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 5;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.top-row .hc-home-link {
    font-weight: 600;
    color: var(--hc-accent);
    text-decoration: none;
    font-size: 0.92rem;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--hc-accent);
    border-radius: 6px;
    margin-right: 0.6rem;
    white-space: nowrap;
}

.top-row .hc-home-link:hover {
    background: var(--hc-accent);
    color: #fff;
}

.top-row .hc-app-title {
    font-weight: 600;
    color: var(--hc-text);
    text-decoration: none;
    font-size: 1rem;
}

.top-row .hc-app-sub {
    color: var(--hc-muted);
    font-size: 0.82rem;
    margin-left: 0.5rem;
}

.top-row .hc-lang {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.top-row .hc-lang-label {
    color: var(--hc-muted);
    font-size: 0.8rem;
    margin: 0;
}

.top-row .hc-lang .form-select {
    width: auto;
    min-width: 7.5rem;
}

.content {
    padding: 1.5rem 1.75rem;
    flex: 1 1 auto;
}

/* Collapse behaviour: hidden on mobile, forced open on desktop */
.collapse { display: none; }

@media (min-width: 641px) {
    .navbar-toggler { display: none; }
    .sidebar .collapse { display: block; }
}

/* ---- Form / validation (kept from original) ----------------------------- */

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

.btn-primary {
    color: #fff;
    background-color: var(--hc-primary);
    border-color: var(--hc-primary-dark);
    border-radius: 8px;
    font-weight: 600;
}

    .btn-primary:hover {
        background-color: var(--hc-primary-dark);
        border-color: var(--hc-primary-dark);
    }

.valid.modified:not([type=checkbox]) { outline: 1px solid #26b050; }

.invalid { outline: 1px solid red; }

.validation-message { color: red; }

#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after { content: "An error has occurred."; }

.loading-progress {
    position: absolute;
    display: block;
    width: 8rem;
    height: 8rem;
    inset: 20vh 0 auto 0;
    margin: 0 auto;
}

    .loading-progress circle {
        fill: none;
        stroke: #e0e0e0;
        stroke-width: 0.6rem;
        transform-origin: 50% 50%;
        transform: rotate(-90deg);
    }

        .loading-progress circle:last-child {
            stroke: var(--hc-primary);
            stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
            transition: stroke-dasharray 0.05s ease-in-out;
        }

.loading-progress-text {
    position: absolute;
    text-align: center;
    font-weight: bold;
    inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
}

    .loading-progress-text:after { content: var(--blazor-load-percentage-text, "Loading"); }

code { color: #c02d76; }

/* ---- Navigation search + collapsible groups (enhanced NavMenu) ---------- */

.nav-search {
    margin: 0.4rem 0.6rem 0.5rem;
}

    .nav-search .form-control {
        background: rgba(255, 255, 255, 0.10);
        border: 1px solid rgba(255, 255, 255, 0.18);
        color: #fff;
        border-radius: 6px;
        font-size: 0.85rem;
        padding: 0.35rem 0.6rem;
    }

        .nav-search .form-control::placeholder { color: rgba(255, 255, 255, 0.5); }

        .nav-search .form-control:focus {
            background: rgba(255, 255, 255, 0.16);
            color: #fff;
            box-shadow: none;
            border-color: var(--hc-accent);
        }

.nav-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0.7rem 0.8rem 0.15rem;
    padding: 0.25rem 0.35rem;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
}

    .nav-group-header:hover { background: rgba(255, 255, 255, 0.05); }

    .nav-group-header .nav-group-title { margin: 0; cursor: pointer; }

.nav-group-count {
    background: rgba(255, 255, 255, 0.12);
    color: #cfe0ee;
    font-size: 0.7rem;
    border-radius: 10px;
    padding: 0 0.42rem;
    line-height: 1.4;
}

.nav-group-items.collapsed { display: none; }

.nav-empty {
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.82rem;
    padding: 0.5rem 0.9rem;
}

/* ---- Home (hero + grouped card grid) ------------------------------------ */

.hc-hero {
    background: linear-gradient(135deg, var(--hc-primary) 0%, var(--hc-primary-dark) 100%);
    color: #fff;
    border-radius: 12px;
    padding: 2rem 2.25rem;
    margin-bottom: 1.75rem;
    box-shadow: 0 6px 20px rgba(27, 110, 194, 0.18);
}

    .hc-hero h1 {
        font-size: 1.8rem;
        margin: 0 0 0.5rem;
        font-weight: 700;
    }

    .hc-hero p {
        margin: 0;
        opacity: 0.92;
        max-width: 48rem;
        line-height: 1.5;
    }

.hc-group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.hc-group-card {
    background: var(--hc-card-bg);
    border: 1px solid var(--hc-border);
    border-radius: 10px;
    padding: 1rem 1.1rem 1.1rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: box-shadow .15s ease, transform .15s ease;
}

    .hc-group-card:hover {
        box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
        transform: translateY(-2px);
    }

    .hc-group-card h3 {
        font-size: 1rem;
        margin: 0 0 0.25rem;
        color: var(--hc-text);
        display: flex;
        align-items: center;
        gap: 0.45rem;
    }

    .hc-group-card .badge {
        background: var(--hc-primary);
        font-weight: 600;
    }

    .hc-group-card ul {
        list-style: none;
        margin: 0.4rem 0 0;
        padding: 0;
        max-height: 220px;
        overflow-y: auto;
    }

    .hc-group-card li { padding: 1px 0; }

    .hc-group-card a {
        color: var(--hc-muted);
        text-decoration: none;
        font-size: 0.88rem;
        display: block;
        padding: 3px 6px;
        border-radius: 4px;
        transition: background-color .12s ease, color .12s ease;
    }

        .hc-group-card a:hover {
            background: var(--hc-content-bg);
            color: var(--hc-primary);
        }

/* ---- CalcPage (card wrapping, responsive input grid) ------------------- */

.calc-card {
    background: var(--hc-card-bg);
    border: 1px solid var(--hc-border);
    border-radius: 12px;
    padding: 1.5rem 1.5rem 1.75rem;
    max-width: 780px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

    .calc-card h2 {
        margin: 0 0 1.1rem;
        font-size: 1.4rem;
        color: var(--hc-text);
    }

.calc-form {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.9rem 1rem;
    max-width: none;
}

.calc-field { margin-bottom: 0; }

    .calc-field label {
        display: block;
        font-size: 0.8rem;
        font-weight: 600;
        color: var(--hc-muted);
        margin-bottom: 4px;
    }

    .calc-field .form-control,
    .calc-field .form-select {
        border-radius: 8px;
    }

.calc-form > .btn {
    grid-column: 1 / -1;
    justify-self: start;
    margin-top: 0.35rem;
    padding: 0.5rem 1.6rem;
}

.result-card {
    background: var(--hc-card-bg);
    border: 1px solid var(--hc-border);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin-top: 1.25rem;
    max-width: 780px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.result table {
    margin: 0;
    font-size: 0.92rem;
}

    .result table td:first-child {
        font-weight: 600;
        color: var(--hc-text);
        white-space: nowrap;
        width: 45%;
    }

    .result table td:last-child {
        color: var(--hc-primary-dark);
    }

.chart-box {
    margin-top: 1rem;
    background: #fff;
    border: 1px solid var(--hc-border);
    border-radius: 10px;
    padding: 10px;
    overflow-x: auto;
}

/* ---- Responsive tweaks -------------------------------------------------- */

@media (max-width: 640px) {
    .page { flex-direction: column; }

    .sidebar {
        flex: 0 0 auto;
        width: 100%;
        min-width: 0;
        box-shadow: none;
    }

    .nav-scrollable { max-height: 65vh; }

    main > .top-row { position: static; }

    .content { padding: 1rem; }

    .hc-hero { padding: 1.5rem; }
}