:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --input-bg: rgba(15, 23, 42, 0.8);
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--panel-border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Layout */
.container {
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
}

.app-grid {
    display: grid;
    grid-template-columns: 600px 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    .app-grid {
        grid-template-columns: 1fr;
    }
}

/* Glass Panels */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

/* Typography & Elements */
.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #e2e8f0;
}

.divider {
    border: 0;
    height: 1px;
    background: var(--panel-border);
    margin: 1.5rem 0;
}

/* Form Elements */
.form-group {
    margin-bottom: 1rem;
}

.form-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

input, select {
    width: 100%;
    padding: 0.6rem;
    border-radius: 8px;
    border: 1px solid var(--panel-border);
    background: var(--input-bg);
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: all 0.2s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

option, optgroup {
    background: var(--bg-color);
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 0.9rem;
    font-family: var(--font-family);
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}
.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

/* Dynamic Rows */
.dynamic-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    align-items: center;
    animation: fadeIn 0.3s ease-out;
}

.dynamic-row input {
    width: 100%;
    flex: 1;
}

.dynamic-row .part-desc {
    flex: 4;
}

/* Visualizer */
.visualizer {
    min-height: 600px;
    display: flex;
    flex-direction: column;
}

.visualizer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.stats-badge {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.canvas-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
    align-items: center;
    padding: 1rem;
}

.sheet-canvas-wrapper {
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.sheet-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

canvas {
    background-color: #f8fafc;
    border-radius: 4px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

/* Login Page specific */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 100px);
}

.login-box {
    width: 100%;
    max-width: 400px;
}
.login-box h2 {
    margin-bottom: 0.5rem;
}
.login-box p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.flashes {
    margin-bottom: 1rem;
}
.flash {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    padding: 0.8rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

@media print {
    body {
        background: white !important;
        color: black !important;
    }
    .sidebar, .navbar, button, #hoverTooltip, #infoModal {
        display: none !important;
    }
    .visualizer-header h2, .visualizer-header .stats-badge {
        display: none !important;
    }
    .visualizer-header {
        display: block !important;
        margin-bottom: 1rem !important;
    }
    #budgetLegend {
        color: black !important;
        font-size: 1rem !important;
    }
    .app-grid {
        display: block !important;
    }
    .visualizer {
        box-shadow: none !important;
        border: none !important;
        background: white !important;
        min-height: auto !important;
        padding: 0 !important;
    }
    .sheet-canvas-wrapper {
        page-break-before: always;
        break-before: page;
        box-shadow: none !important;
        border: none !important;
        margin-bottom: 0 !important;
        background: white !important;
        padding: 0 !important;
        text-align: center;
    }
    .sheet-canvas-wrapper:first-of-type {
        page-break-before: auto;
        break-before: auto;
    }
    .sheet-canvas-wrapper canvas {
        max-width: 100% !important;
        max-height: 95vh !important;
        object-fit: contain;
    }
    .legend-table {
        page-break-before: always;
        break-before: page;
        width: 100%;
        border-collapse: collapse;
        margin-top: 2rem;
        font-size: 12px;
        color: black;
    }
    .legend-table th, .legend-table td {
        border: 1px solid #ccc;
        padding: 6px;
        text-align: center;
    }
    .legend-table th {
        background-color: #f1f5f9;
        font-weight: bold;
    }
    .color-box {
        display: inline-block;
        width: 16px;
        height: 16px;
        border: 1px solid #000;
        vertical-align: middle;
    }
}