:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --bg-card: rgba(30, 41, 59, 0.6);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --highlight: #10b981;
    --highlight-glow: rgba(16, 185, 129, 0.3);
    --danger: #ef4444;
    --glass-blur: 12px;
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
}

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

body {
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography & Utils */
h1, h2, h3 { font-weight: 600; }
a { color: var(--primary); text-decoration: none; }
.mt-2 { margin-top: 1.5rem; }

/* Views Toggle */
.view {
    display: none;
    opacity: 0;
    transition: var(--transition);
}
.view.active {
    display: flex;
    opacity: 1;
    width: 100%;
    height: 100vh;
}

.section {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}
.section.active {
    display: block;
}

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

/* Glassmorphism Card Base */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

/* Toast */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    transform: translateX(150%);
    transition: var(--transition);
    z-index: 1000;
}
.toast.show {
    transform: translateX(0);
}

/* --- Login View --- */
#login-view {
    justify-content: center;
    align-items: center;
}
.login-card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: var(--radius);
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}
.login-card h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}
.login-card h1 span {
    color: var(--primary);
}
.login-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}
.login-card .hint {
    font-size: 0.8rem;
    margin-top: 1rem;
    margin-bottom: 0;
}

/* Forms */
.input-group {
    text-align: left;
    margin-bottom: 1.5rem;
}
.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}
.input-group input, .input-group select {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(15, 23, 42, 0.5);
    color: var(--text-main);
    outline: none;
    transition: var(--transition);
}
.input-group input:focus, .input-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.btn-primary {
    width: 100%;
    padding: 0.8rem;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}
.btn-secondary {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: transparent;
    color: var(--text-main);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* --- Dashboard Layout --- */
.sidebar {
    width: 260px;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 2rem 1rem;
}
.sidebar .logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
}
.sidebar .logo span {
    color: var(--primary);
}
.sidebar nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 1rem;
    text-align: left;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    font-weight: 500;
}
.nav-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}
.nav-btn.active {
    background: var(--primary);
    color: white;
}
.sidebar-footer {
    text-align: center;
}
.sidebar-footer span {
    display: block;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--highlight);
    font-weight: 600;
}

.main-content {
    flex: 1;
    padding: 3rem;
    overflow-y: auto;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
header h2 {
    font-size: 2rem;
}
.year-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.year-selector input {
    background: transparent;
    border: none;
    color: var(--text-main);
    width: 60px;
    outline: none;
    font-weight: 600;
}

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}
.kpi-card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--radius);
    transition: var(--transition);
}
.kpi-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}
.kpi-card h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.kpi-card p {
    font-size: 2rem;
    font-weight: 700;
}
.kpi-card.highlight {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-color: rgba(16, 185, 129, 0.2);
}
.kpi-card.highlight p {
    color: var(--highlight);
}

/* Charts */
.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}
.chart-card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--radius);
}
.chart-card h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
}
canvas {
    width: 100% !important;
    height: 300px !important;
}

/* Form Area */
.form-card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: var(--radius);
    max-width: 800px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem 1.5rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

/* Tables */
.table-container {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    min-width: 1000px;
}
th, td {
    padding: 1rem;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
}
th:first-child, td:first-child {
    text-align: left;
    position: sticky;
    left: 0;
    background: rgba(15, 23, 42, 0.95);
    z-index: 2;
}
th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-muted);
    font-weight: 500;
}
tr:hover td {
    background: rgba(255, 255, 255, 0.05);
}
.highlight {
    font-weight: 700;
    color: var(--highlight);
}
.row-header {
    font-weight: 600;
    color: var(--text-main) !important;
}
.row-total {
    background: rgba(99, 102, 241, 0.05);
}
.row-total td {
    font-weight: 700;
    color: #fff;
}

/* Margins Section Specifics */
.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}
.mb-2 {
    margin-bottom: 2rem;
}
.text-danger {
    color: var(--danger) !important;
}
.text-success {
    color: var(--highlight) !important;
}