/* GearPro Web Calculator - Professional Industrial UI */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2128;
    --bg-input: #0d1117;
    --border: #30363d;
    --border-active: #2563eb;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --accent-blue: #2563eb;
    --accent-green: #22c55e;
    --accent-yellow: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #a855f7;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    font-size: 14px;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    align-items: center;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 32px; height: 32px;
    background: var(--accent-blue);
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
}

.logo-text { font-weight: 700; font-size: 16px; color: var(--text-primary); }
.logo-version { font-size: 11px; color: var(--text-muted); margin-left: 4px; }

.header-subtitle {
    margin-left: 24px;
    padding-left: 24px;
    border-left: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 13px;
}

.header-actions { margin-left: auto; display: flex; gap: 8px; }

/* Main layout */
.main-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: calc(100vh - 56px);
}

/* Sidebar */
.sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 16px 0;
}

.sidebar-section { margin-bottom: 24px; }
.sidebar-label {
    padding: 4px 16px 8px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.15s;
    border-left: 3px solid transparent;
    font-size: 13px;
}

.sidebar-item:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.sidebar-item.active {
    background: rgba(37,99,235,0.12);
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
}

.sidebar-item .icon { width: 18px; text-align: center; font-size: 14px; }

/* Content */
.content { overflow: auto; }

/* Tab panes */
.tab-pane { display: none; padding: 24px; }
.tab-pane.active { display: block; }

/* Page title */
.page-title {
    margin-bottom: 24px;
}
.page-title h1 {
    font-size: 20px; font-weight: 600;
    display: flex; align-items: center; gap: 8px;
}
.page-title p { color: var(--text-secondary); margin-top: 4px; font-size: 13px; }

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 16px;
}

.card-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 13px;
    display: flex; align-items: center; gap: 8px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.card-header .dot {
    width: 8px; height: 8px; border-radius: 50%;
}

.card-body { padding: 16px; }

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.col-span-2 { grid-column: span 2; }

/* Form elements */
.form-group { margin-bottom: 14px; }

.form-label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 5px;
    font-weight: 500;
}

.form-label .unit {
    color: var(--text-muted);
    font-weight: 400;
    margin-left: 4px;
}

.form-label .symbol {
    font-style: italic;
    color: var(--accent-blue);
}

.form-control {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 7px 10px;
    color: var(--text-primary);
    font-size: 13px;
    font-family: 'Consolas', 'Courier New', monospace;
    transition: border-color 0.15s;
    outline: none;
}

.form-control:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

.form-control.error { border-color: var(--accent-red); }

.form-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 3px;
}

/* Result fields */
.result-group { margin-bottom: 10px; }

.result-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 2px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.result-value {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    padding: 6px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 5px;
    min-height: 34px;
    display: flex; align-items: center;
}

.result-value.highlight { color: var(--accent-green); border-color: rgba(34,197,94,0.3); }
.result-value.warning   { color: var(--accent-yellow); border-color: rgba(245,158,11,0.3); }
.result-value.info      { color: var(--accent-blue);  border-color: rgba(37,99,235,0.3); }

.result-unit {
    font-size: 11px;
    color: var(--text-muted);
    margin-left: 4px;
    font-weight: 400;
}

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s;
    outline: none;
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
}
.btn-primary:hover { background: #1d4ed8; }

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: rgba(255,255,255,0.06); color: var(--text-primary); }

.btn-success {
    background: rgba(34,197,94,0.15);
    color: var(--accent-green);
    border: 1px solid rgba(34,197,94,0.3);
}
.btn-success:hover { background: rgba(34,197,94,0.25); }

.btn-lg { padding: 10px 20px; font-size: 14px; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.btn-group { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* Canvas */
.canvas-wrapper {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    display: flex; align-items: center; justify-content: center;
}

canvas { display: block; max-width: 100%; }

/* Table */
.result-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.result-table th {
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    text-align: left;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
}

.result-table td {
    padding: 8px 12px;
    border-bottom: 1px solid rgba(48,54,61,0.5);
    color: var(--text-primary);
}

.result-table td.symbol {
    font-style: italic;
    color: var(--accent-blue);
    font-family: 'Consolas', monospace;
    width: 80px;
}

.result-table td.value {
    font-family: 'Consolas', monospace;
    font-weight: 600;
    text-align: right;
    color: var(--accent-green);
}

.result-table td.unit {
    color: var(--text-muted);
    width: 50px;
    font-size: 11px;
}

.result-table tr:hover td { background: rgba(255,255,255,0.02); }

/* Status badge */
.badge {
    display: inline-flex; align-items: center;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 600;
}

.badge-ok    { background: rgba(34,197,94,0.15); color: var(--accent-green); }
.badge-warn  { background: rgba(245,158,11,0.15); color: var(--accent-yellow); }
.badge-error { background: rgba(239,68,68,0.15); color: var(--accent-red); }

/* Separator */
.section-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 20px 0;
}

/* Info tooltip */
.info-row {
    display: flex; align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid rgba(48,54,61,0.4);
}
.info-row:last-child { border-bottom: none; }
.info-key {
    flex: 0 0 180px;
    color: var(--text-secondary);
    font-size: 12px;
}
.info-val {
    font-family: monospace;
    font-weight: 600;
    color: var(--text-primary);
}
.info-unit { color: var(--text-muted); font-size: 11px; margin-left: 4px; }

/* Responsive */
.mobile-menu-btn { display: none; }

@media (max-width: 900px) {
    .main-layout { grid-template-columns: 1fr; }
    .sidebar {
        display: block; position: fixed; left: -260px; top: 56px; bottom: 0;
        width: 240px; z-index: 99; transition: left 0.3s;
    }
    .sidebar.open { left: 0; box-shadow: 4px 0 20px rgba(0,0,0,0.5); }
    .mobile-menu-btn { display: inline-flex !important; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Print */
@media print {
    .header, .sidebar, .btn { display: none; }
    .main-layout { grid-template-columns: 1fr; }
    .card { break-inside: avoid; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #4b5563; }

/* Gear animation */
@keyframes spin { to { transform: rotate(360deg); } }
.spinning { animation: spin 4s linear infinite; transform-origin: center; }