/* ============================================================
   Hydrocyclone Simulator — Design System
   ============================================================ */

:root {
    /* Palette */
    --bg-primary: #0c0e1a;
    --bg-secondary: #111428;
    --bg-card: rgba(18, 22, 48, 0.85);
    --bg-glass: rgba(22, 28, 58, 0.65);
    --border: rgba(100, 120, 200, 0.15);
    --border-hover: rgba(100, 160, 255, 0.35);
    --text-primary: #e8ecf4;
    --text-secondary: #8a92b0;
    --text-muted: #5a6180;
    --accent-cyan: #00d4ff;
    --accent-blue: #4d7cff;
    --accent-purple: #8b5cf6;
    --accent-red: #ff6b6b;
    --accent-amber: #fbbf24;
    --accent-green: #34d399;
    --accent-pink: #f472b6;
    --glow-cyan: rgba(0, 212, 255, 0.15);
    --glow-blue: rgba(77, 124, 255, 0.12);
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    /* Sizing */
    --panel-width: 340px;
    --radius: 12px;
    --radius-sm: 8px;
}

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

html {
    font-size: 14px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(77, 124, 255, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.06) 0%, transparent 60%);
}

/* ---- Header ---- */
#app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
}
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1800px;
    margin: 0 auto;
}
.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.logo-icon {
    font-size: 1.8rem;
    color: var(--accent-cyan);
    text-shadow: 0 0 20px var(--glow-cyan);
}
.logo-area h1 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}
.subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
}
.header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}
.header-actions select {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}
.header-actions select:hover { border-color: var(--border-hover); }

.model-selector {
    background: linear-gradient(135deg, rgba(77,124,255,0.15) 0%, rgba(139,92,246,0.15) 100%) !important;
    border-color: var(--accent-blue) !important;
    font-weight: 600 !important;
    color: var(--accent-cyan) !important;
    padding: 0.5rem 0.9rem !important;
    letter-spacing: 0.02em;
    transition: box-shadow 0.3s, border-color 0.2s;
}
.model-selector:hover {
    box-shadow: 0 0 12px var(--glow-blue);
    border-color: var(--accent-cyan) !important;
}
.model-selector:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--glow-cyan);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.55rem 1.2rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}
.btn-primary:hover { opacity: 0.9; }
.btn-primary:active { transform: scale(0.97); }

.btn-lang {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.45rem 0.8rem;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    letter-spacing: 0.02em;
}
.btn-lang:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.06);
}

/* ---- Main Layout ---- */
#app-main {
    display: flex;
    flex: 1;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
    padding: 1rem;
    gap: 1rem;
}

/* ---- Controls Panel ---- */
#controls-panel {
    width: var(--panel-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    overflow-y: auto;
    max-height: calc(100vh - 80px);
    padding-right: 0.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}
#controls-panel::-webkit-scrollbar { width: 4px; }
#controls-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.control-group {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem;
    backdrop-filter: blur(12px);
    transition: border-color 0.3s;
}
.control-group:hover {
    border-color: var(--border-hover);
}
.group-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.7rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.group-icon {
    color: var(--accent-cyan);
    font-size: 0.9rem;
}

.param-row {
    margin-bottom: 0.55rem;
}
.param-row:last-child { margin-bottom: 0; }
.param-row.param-output {
    opacity: 0.55;
    position: relative;
}
.param-row.param-output::after {
    content: '← OUTPUT';
    position: absolute;
    right: 0;
    top: 0;
    font-size: 0.55rem;
    font-weight: 700;
    color: var(--accent-amber);
    letter-spacing: 0.06em;
    opacity: 0.8;
}
.param-row label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    font-weight: 500;
}
.input-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.input-wrap input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}
.input-wrap input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    border: 2px solid var(--bg-primary);
    cursor: pointer;
    box-shadow: 0 0 6px var(--glow-cyan);
    transition: transform 0.15s;
}
.input-wrap input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}
.input-wrap input[type="number"] {
    width: 70px;
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    padding: 0.3rem 0.4rem;
    text-align: right;
    outline: none;
    transition: border-color 0.2s;
}
.input-wrap input[type="number"]:focus {
    border-color: var(--accent-cyan);
}
.unit {
    font-size: 0.7rem;
    color: var(--text-muted);
    min-width: 32px;
}

/* Targets grid */
.control-group.compact { padding: 0.7rem 0.9rem; }
.targets-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem 0.6rem;
}
.target-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.target-item label {
    font-size: 0.68rem;
    color: var(--text-muted);
    min-width: 50px;
}
.target-item input {
    width: 56px;
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--accent-amber);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 0.2rem 0.3rem;
    text-align: right;
    outline: none;
}
.target-item input:focus { border-color: var(--accent-amber); }
.computed-targets {
    margin-top: 0.5rem;
    padding: 0.45rem 0.6rem;
    background: rgba(0, 212, 255, 0.04);
    border: 1px solid rgba(0, 212, 255, 0.12);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.computed-targets .ct-label {
    color: var(--text-muted);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.2rem;
    display: block;
}
.computed-targets .ct-val {
    color: var(--accent-cyan);
    font-weight: 600;
}
.target-item span {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ---- Results Panel ---- */
#results-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
}

/* KPI Strip */
#kpi-strip {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.kpi-card {
    flex: 1;
    min-width: 130px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem 1rem;
    text-align: center;
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
    opacity: 0.6;
}
.kpi-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.08);
}
.kpi-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
    margin-bottom: 0.35rem;
}
.kpi-value {
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
}
.kpi-unit {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.kpi-status {
    font-size: 0.65rem;
    font-weight: 600;
    margin-top: 0.4rem;
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    display: inline-block;
}
.kpi-status.ok {
    color: var(--accent-green);
    background: rgba(52, 211, 153, 0.1);
}
.kpi-status.warn {
    color: var(--accent-amber);
    background: rgba(251, 191, 36, 0.1);
}
.kpi-status.bad {
    color: var(--accent-red);
    background: rgba(255, 107, 107, 0.1);
}

/* Charts */
#charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    backdrop-filter: blur(12px);
    transition: border-color 0.3s;
}
.chart-card:hover { border-color: var(--border-hover); }
.chart-card h4 {
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.6rem;
    font-weight: 600;
}
.chart-card canvas {
    width: 100% !important;
    max-height: 360px;
}

/* Tables */
.table-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    backdrop-filter: blur(12px);
}
.table-card h4 {
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.6rem;
    font-weight: 600;
}
.table-card table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}
.table-card th {
    text-align: left;
    padding: 0.5rem 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--border);
}
.table-card td {
    padding: 0.45rem 0.8rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    border-bottom: 1px solid rgba(100,120,200,0.06);
}
.table-card tbody tr:hover {
    background: rgba(77, 124, 255, 0.05);
}
.table-card tfoot td {
    font-weight: 600;
    color: var(--accent-amber);
    border-top: 1px solid var(--border);
    border-bottom: none;
}

#arterburn-content {
    font-size: 0.82rem;
    font-family: var(--font-mono);
    line-height: 1.8;
    color: var(--text-secondary);
}
#arterburn-content .art-val {
    color: var(--accent-cyan);
    font-weight: 600;
}
#arterburn-content .art-ratio {
    font-weight: 700;
}
#arterburn-content .art-ratio.good { color: var(--accent-green); }
#arterburn-content .art-ratio.warn { color: var(--accent-amber); }
#arterburn-content .art-ratio.bad { color: var(--accent-red); }

/* Footer */
footer {
    text-align: center;
    padding: 0.8rem;
    font-size: 0.68rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

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

/* Tablet */
@media (max-width: 1100px) {
    #app-main { flex-direction: column; }
    #controls-panel {
        width: 100%;
        max-height: none;
        flex-direction: row;
        flex-wrap: wrap;
        padding-right: 0;
    }
    .control-group { flex: 1; min-width: 280px; }
    #charts-grid { grid-template-columns: 1fr; }
}

/* Phone */
@media (max-width: 640px) {
    html { font-size: 13px; }

    /* Header: stack vertically */
    .header-content {
        flex-direction: column;
        gap: 0.5rem;
        align-items: stretch;
    }
    .logo-area { justify-content: center; }
    .header-actions {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.4rem;
    }
    .header-actions select,
    .header-actions button {
        font-size: 0.72rem;
        padding: 0.4rem 0.6rem;
    }
    .model-selector { padding: 0.4rem 0.6rem !important; }

    /* Main */
    #app-main {
        flex-direction: column;
        padding: 0.5rem;
        gap: 0.5rem;
    }

    /* Controls */
    #controls-panel {
        width: 100%;
        max-height: none;
        flex-direction: column;
        padding-right: 0;
        overflow-y: visible;
    }
    .control-group {
        min-width: 100%;
        padding: 0.7rem;
    }

    /* Touch-friendly slider thumb */
    .input-wrap input[type="range"]::-webkit-slider-thumb {
        width: 20px;
        height: 20px;
    }
    .input-wrap input[type="range"] {
        height: 6px;
    }
    .input-wrap input[type="number"] {
        width: 60px;
        font-size: 0.82rem;
        padding: 0.35rem;
    }

    /* KPIs */
    #kpi-strip {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.4rem;
    }
    .kpi-card {
        min-width: 0;
        padding: 0.6rem 0.5rem;
    }
    .kpi-value { font-size: 1.2rem; }
    .kpi-label { font-size: 0.62rem; }

    /* Charts: single column, reduced height */
    #charts-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    .chart-card {
        padding: 0.6rem;
    }
    .chart-card canvas {
        max-height: 240px;
    }

    /* Tables: horizontal scroll */
    .table-card {
        padding: 0.6rem;
        overflow-x: auto;
    }
    .table-card table {
        font-size: 0.72rem;
        min-width: 400px;
    }
    .table-card th,
    .table-card td {
        padding: 0.35rem 0.5rem;
    }

    /* Footer */
    footer {
        flex-direction: column;
        gap: 0.3rem;
        padding: 0.6rem;
    }

    /* Targets grid */
    .targets-grid {
        grid-template-columns: 1fr;
    }
}

/* Extra-small phones */
@media (max-width: 360px) {
    html { font-size: 12px; }
    #kpi-strip { grid-template-columns: 1fr; }
    .kpi-value { font-size: 1rem; }
    .header-actions { gap: 0.3rem; }
}

/* ---- Doc button in header ---- */
.btn-doc {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.45rem 0.8rem;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    letter-spacing: 0.02em;
}
.btn-doc:hover {
    border-color: var(--accent-green);
    color: var(--accent-green);
    background: rgba(52, 211, 153, 0.06);
}