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

:root {
    --bg-main: #0f172a;
    --bg-panel: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-teal: #14b8a6;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-blur: 16px;
    --success: #22c55e;
    --danger: #ef4444;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(20, 184, 166, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
    background-attachment: fixed;
    line-height: 1.6;
}

/* Utilities */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.2);
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Login Page */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-container .logo {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.login-container .logo span {
    color: var(--accent-teal);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    outline: none;
}

.form-group input:focus {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 2px rgba(20, 184, 166, 0.2);
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 12px 24px;
    border-radius: 10px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s ease;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-purple));
    color: white;
    box-shadow: 0 4px 15px rgba(20, 184, 166, 0.3);
}

.btn.primary:hover {
    box-shadow: 0 6px 20px rgba(20, 184, 166, 0.5);
    transform: translateY(-1px);
}

.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Dashboard Layout */
.dashboard {
    display: grid;
    grid-template-columns: 250px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
}

.sidebar .logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.sidebar .logo span {
    color: var(--accent-teal);
}

.nav-item {
    padding: 12px 16px;
    border-radius: 10px;
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.nav-item:hover, .nav-item.active {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    border-left: 3px solid var(--accent-teal);
    background: linear-gradient(90deg, rgba(20, 184, 166, 0.1), transparent);
}

.main-content {
    padding: 2rem;
    overflow-y: auto;
    height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.header h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

.user-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.logout-btn {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.logout-btn:hover {
    color: var(--danger);
}

/* Grid System */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-3 { grid-template-columns: repeat(1, 1fr); }
}

@media (max-width: 768px) {
    .dashboard { grid-template-columns: 1fr; }
    .sidebar { display: none; } /* Add mobile menu later if needed */
    .grid-cols-2 { grid-template-columns: 1fr; }
}

/* Specific Components */
.metric-card {
    display: flex;
    flex-direction: column;
}

.metric-card .title {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.metric-card .value {
    font-size: 2rem;
    font-weight: 700;
}

.metric-card.positive .value { color: var(--success); }
.metric-card.negative .value { color: var(--danger); }

.chart-container {
    height: 350px;
    width: 100%;
    margin-top: 1rem;
    touch-action: pan-y !important;
}

.chart-container-large {
    height: 500px;
    width: 100%;
    margin-top: 1rem;
    touch-action: pan-y !important;
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab {
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem 1rem;
    position: relative;
    transition: color 0.3s;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    color: var(--text-primary);
    font-weight: 600;
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -9px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-teal);
    border-radius: 2px 2px 0 0;
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--accent-teal);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 50px auto;
}

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

.hidden {
    display: none !important;
}

.date-input {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    padding: 6px 10px;
    font-size: 0.9rem;
    outline: none;
    color-scheme: dark;
}