/* ── Variables ──────────────────────────────────────────────── */
:root {
    --main-theme-color: #F96302;
    --nav-bg: #1a1a1a;
    --nav-width: 200px;
    --bg: #dcdcdc;
}

/* ── Base ────────────────────────────────────────────────────── */
html {
    background-color: var(--bg);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: medium;
}

body {
    margin-left: auto;
    margin-right: auto;
    max-width: 960px;
}

h1 {
    color: #1a1a1a;
    text-align: left;
    font-size: 1.6rem;
    margin-top: 0;
    margin-bottom: 16px;
}

h2 {
    color: #1a1a1a;
    font-size: 1.1rem;
    margin-top: 0;
    margin-bottom: 12px;
}

/* ── SPA shell layout ────────────────────────────────────────── */
body:has(#shell) {
    max-width: none;
    margin: 0;
}

#shell {
    display: flex;
    min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────────────── */
#sidebar {
    width: var(--nav-width);
    flex-shrink: 0;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    background: var(--nav-bg);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    z-index: 100;
}

#sidebar-header {
    padding: 20px 16px 14px;
    border-bottom: 1px solid #2a2a2a;
}

#sidebar-header h2 {
    color: #F96302;
    font-size: 1rem;
    margin: 0 0 2px 0;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

#sidebar-header p {
    color: #666;
    font-size: 0.72rem;
    margin: 0;
}

#sidebar nav {
    flex: 1;
    padding: 8px 0;
    display: flex;
    flex-direction: column;
}

.nav-section-label {
    color: #555;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 14px 16px 4px;
}

.nav-divider {
    border: none;
    border-top: 1px solid #2a2a2a;
    margin: 6px 0;
}

#sidebar .nav-link {
    display: block;
    color: #bbb;
    text-decoration: none;
    padding: 11px 20px;
    font-size: 0.92rem;
    transition: background 120ms, color 120ms;
    border-left: 3px solid transparent;
}

#sidebar .nav-link:hover {
    background: #2a2a2a;
    color: white;
}

#sidebar .nav-link.active {
    background: rgba(249, 99, 2, 0.12);
    color: #F96302;
    border-left-color: #F96302;
}

#sidebar .nav-link.external {
    font-style: italic;
    color: #666;
    font-size: 0.82rem;
}

#sidebar .nav-link.external:hover {
    color: #999;
}

/* ── Main content area ───────────────────────────────────────── */
#main-content {
    margin-left: var(--nav-width);
    padding: 28px 32px;
    background: var(--bg);
    min-height: 100vh;
    flex: 1;
    box-sizing: border-box;
}

/* ── Views ───────────────────────────────────────────────────── */
.view {
    display: none;
}

.view.active {
    display: block;
}

/* ── Cards ───────────────────────────────────────────────────── */
.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.10), 0 1px 4px rgba(0, 0, 0, 0.06);
    padding: 24px 28px;
    margin-bottom: 20px;
}

/* ── Formula input grids (both ID and class selectors) ───────── */
#colorsContainer,
.colorsContainer {
    display: flex;
    gap: 10px;
    width: 100%;
}

.colorGroup {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.formulaPaste {
    border: 2px solid var(--main-theme-color);
    box-sizing: border-box;
    padding: 8px 10px;
    font-size: 0.85rem;
    margin-bottom: 6px;
    width: 100%;
    border-radius: 8px;
}

#colorsContainer .color,
.colorsContainer .color {
    display: flex;
    flex-direction: column;
    padding: 3px 6px;
}

#colorsContainer .formulaRow,
.colorsContainer .formulaRow {
    display: flex;
}

#colorsContainer .formulaRow *,
.colorsContainer .formulaRow * {
    border: 2px solid var(--main-theme-color);
    box-sizing: border-box;
    margin: 0;
    padding-top: 9px;
    padding-bottom: 9px;
    font-size: 0.95rem;
    flex: 1;
    max-width: 110px;
}

/* ── Size selectors (resizer) ────────────────────────────────── */
#sizeSelectors {
    display: flex;
    gap: 8px;
    padding: 8px 6px;
    flex-wrap: wrap;
}

#sizeSelectors select {
    border: 2px solid var(--main-theme-color);
    padding: 8px;
    font-size: 0.95rem;
    box-sizing: border-box;
}

/* ── Results tables ──────────────────────────────────────────── */
table, th, td {
    background-color: white;
    text-align: center;
    color: black;
    border: 2px solid var(--main-theme-color);
    border-collapse: collapse;
    font-weight: bold;
}

th {
    background-color: var(--main-theme-color);
    color: white;
}

td {
    width: 40px;
    background-color: #f0f0f0;
}

/* ── Buttons ─────────────────────────────────────────────────── */
button, Button {
    display: inline-block;
    padding: 10px 22px;
    background-color: var(--main-theme-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 120ms, box-shadow 120ms;
    margin: 10px 0 4px 4px;
    box-shadow: 0 2px 6px rgba(249, 99, 2, 0.35);
}

button:hover, Button:hover {
    background-color: #d85400;
    box-shadow: 0 4px 12px rgba(249, 99, 2, 0.45);
}


/* ── Old-page bottom nav (kept for scaler/combiner/resizer/differ.html) ── */
body:not(:has(#shell)) nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: auto;
    white-space: nowrap;
    background-color: #333;
}

li {
    border-right: 1px solid gray;
    display: inline-block;
}

li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    transition-duration: 100ms;
}

li a:hover {
    background-color: #111;
    color: white;
}

.active {
    background-color: var(--main-theme-color);
}

.externalWebsite {
    font-style: oblique;
}

/* ── Responsive: mobile bottom tab bar ──────────────────────── */
@media (max-width: 640px) {
    #sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
        z-index: 100;
    }

    #sidebar-header {
        display: none;
    }

    #sidebar nav {
        flex-direction: row;
        flex: 1;
        padding: 0;
        overflow-x: auto;
    }

    .nav-section-label,
    .nav-divider {
        display: none;
    }

    #sidebar .nav-link {
        flex: 1;
        text-align: center;
        padding: 10px 6px;
        font-size: 0.75rem;
        border-left: none;
        border-top: 3px solid transparent;
        white-space: nowrap;
        min-width: 56px;
    }

    #sidebar .nav-link.active {
        background: rgba(249, 99, 2, 0.15);
        border-left-color: transparent;
        border-top-color: #F96302;
    }

    #sidebar .nav-link.external {
        display: none;
    }

    #main-content {
        margin-left: 0;
        padding: 16px;
        padding-bottom: 68px;
    }
}