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

:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --background: #f1f5f9;
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.8);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Pages */
.page {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page.active {
    display: block;
}

/* Auth Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: radial-gradient(circle at top left, #e0e7ff 0%, #f1f5f9 50%, #e0f2fe 100%);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.4);
    color: white;
}

.auth-header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(to bottom right, var(--text-main), var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Cards & Glassmorphism */
.card {
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
}

#calculator-content .card {
    max-width: 900px;
    margin: 0 auto 2rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Forms - Grid System */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-label,
.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.input-field {
    width: 100%;
    padding: 12px 18px;
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    color: var(--text-main);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
    background: white;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 14px 28px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    padding: 10px 20px;
    background: white;
    color: var(--text-main);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--background);
    border-color: var(--text-muted);
}

.button-group {
    display: flex;
    background: var(--background);
    padding: 6px;
    border-radius: var(--radius-md);
    gap: 4px;
}

.btn-toggle {
    flex: 1;
    padding: 10px;
    background: transparent;
    color: var(--text-muted);
    border: none;
    border-radius: calc(var(--radius-md) - 4px);
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

.btn-toggle.active {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Sidebar */
.layout {
    display: flex;
    min-height: 100vh;
    background: #f8fafc;
}

.sidebar {
    width: 280px;
    background: white;
    border-right: 1px solid var(--border);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar-header {
    margin-bottom: 2.5rem;
}

.logo-icon-small {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 1rem;
    color: white;
    box-shadow: var(--shadow-md);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    letter-spacing: -0.5px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 0.5rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-item:hover {
    background: var(--background);
    color: var(--primary);
}

.nav-item.active {
    background: rgba(79, 70, 229, 0.08);
    color: var(--primary);
}

.btn-logout {
    margin-top: auto;
    padding: 12px;
    background: #fef2f2;
    color: var(--danger);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Main Content */
.main-content {
    flex: 1;
    padding: 3rem;
    max-width: 1400px;
    margin: 0 auto;
}

.main-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 44px;
    height: 44px;
    background: var(--background);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 1rem;
}

/* KPI Visualization */
.kpi-grid,
.kpi-grid-5 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.kpi-card {
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    color: white;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.kpi-card::after {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.kpi-card.blue {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
}

.kpi-card.purple {
    background: linear-gradient(135deg, #a855f7, #7e22ce);
}

.kpi-card.green {
    background: linear-gradient(135deg, #10b981, #047857);
}

.kpi-card.orange {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.kpi-card.red {
    background: linear-gradient(135deg, #ef4444, #b91c1c);
}

.kpi-label {
    font-size: 0.85rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.kpi-value {
    font-size: 1.8rem;
    font-weight: 700;
}

/* Scenario List */
.scenario-item {
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    transition: var(--transition);
}

.scenario-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

/* Specific Utilities */
.error-message {
    background: #fef2f2;
    color: var(--danger);
    padding: 1rem;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--danger);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .sidebar {
        width: 80px;
        padding: 1rem;
    }

    .sidebar-header,
    .nav-item span,
    .btn-logout span {
        display: none;
    }

    .nav-item {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .main-content {
        padding: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}