/* Modern CSS Variables & Theming */
:root {
    --bg-dark: #0f172a;           /* Deep Slate */
    --bg-card: rgba(30, 41, 59, 0.7); /* Translucent Blue-Gray */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;       /* Bright Blue */
    --accent-blue-hover: #2563eb;
    --accent-pink: #ec4899;       /* Vibrant Pink */
    --accent-pink-hover: #db2777;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Dynamic Background Effect */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.15), transparent 25%);
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem;
}

/* Typography */
h1, h2, h3 {
    font-weight: 600;
    letter-spacing: -0.025em;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Header Styles */
.app-header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease-out;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--accent-blue), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo svg {
    color: var(--accent-blue);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.badge {
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent-blue);
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Glassmorphism Panels */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.45);
}

/* Forms & Inputs */
.upload-form, .config-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

@media (min-width: 768px) {
    .upload-form, .config-controls {
        flex-direction: row;
        justify-content: center;
    }
}

input[type="file"] {
    background: rgba(15, 23, 42, 0.5);
    border: 1px dashed var(--accent-blue);
    padding: 1rem;
    border-radius: 8px;
    color: var(--text-primary);
    width: 100%;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

input[type="file"]:hover {
    border-color: var(--accent-pink);
}

.custom-select {
    background: rgba(15, 23, 42, 0.8);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    min-width: 250px;
    outline: none;
    transition: border-color 0.3s ease;
}

.custom-select:focus {
    border-color: var(--accent-blue);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-blue-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--accent-pink);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(236, 72, 153, 0.39);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--accent-pink-hover);
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Layout for Results */
.visualization-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .visualization-grid {
        grid-template-columns: 1fr 1fr;
    }
    .chart-full {
        grid-column: 1 / -1;
    }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.stat-card {
    background: rgba(15, 23, 42, 0.6);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.stat-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-pink);
}

/* Table Styles */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.data-table th, .data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.data-table th {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
    font-weight: 600;
}

.data-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Charts Section */
.charts-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .charts-container {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1024px) {
    .charts-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

.chart-wrapper {
    background: rgba(15, 23, 42, 0.4);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chart-wrapper h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Utilities */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
    font-size: 0.9rem;
}

.alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--text-primary);
}

.alert-info svg {
    color: var(--accent-blue);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}