@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --accent-color: #0ea5e9;
    --accent-hover: #38bdf8;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success-color: #10b981;
    --error-color: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background: radial-gradient(circle at top left, var(--bg-gradient-start), var(--bg-gradient-end));
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

h1, h2, h3, h4 {
    font-weight: 600;
    letter-spacing: -0.025em;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

/* Glassmorphism Classes */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    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);
}

/* Header */
header {
    text-align: center;
    margin-bottom: 1.5rem;
}

header h1 {
    font-size: 2rem;
    background: -webkit-linear-gradient(45deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.25rem;
}

header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

select, input[type="file"], input[type="number"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

select:focus, input[type="file"]:focus, input[type="number"]:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

select option {
    background-color: var(--bg-gradient-start);
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.3s ease, transform 0.2s ease;
}

.btn:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-cols-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid-cols-5 {
    grid-template-columns: repeat(5, 1fr);
}

@media (max-width: 1024px) {
    .grid-cols-5 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-cols-3, .grid-cols-5 {
        grid-template-columns: 1fr;
    }
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 2rem;
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.alert.success {
    background: rgba(16, 185, 129, 0.2);
    border-left: 4px solid var(--success-color);
}

.alert.error {
    background: rgba(239, 68, 68, 0.2);
    border-left: 4px solid var(--error-color);
}

/* File List */
.file-list {
    list-style: none;
}

.file-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
    transition: background 0.3s ease;
}

.file-list li:hover {
    background: rgba(255, 255, 255, 0.05);
}

.file-list li:last-child {
    border-bottom: none;
}

.file-name {
    font-weight: 500;
}

/* Dashboard Specifics */
.dashboard-controls {
    margin-bottom: 2rem;
}

.chart-container {
    position: relative;
    height: 60vh;
    width: 100%;
}

.loader {
    display: none;
    border: 4px solid rgba(255,255,255,0.1);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}