:root {
    /* Emerald/Slate Theme */
    --slate-900: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-400: #94a3b8;
    --slate-300: #cbd5e1;
    --slate-50: #f8fafc;
    
    --emerald-400: #34d399;
    --emerald-500: #10b981;
    --emerald-600: #059669;

    --bg-color: var(--slate-900);
    --text-main: var(--slate-50);
    --text-muted: var(--slate-400);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --primary: var(--emerald-500);
    --primary-hover: var(--emerald-400);
    
    --radius: 12px;
    --transition: all 0.3s ease;
}

body:not(.dark) {
    --bg-color: var(--slate-50);
    --text-main: var(--slate-900);
    --text-muted: var(--slate-700);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    transition: var(--transition);
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
}

.app-wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-radius: 0;
    border-top: none;
    border-left: none;
    border-right: none;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: inherit;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

body:not(.dark) .btn-secondary:hover {
    background: rgba(0, 0, 0, 0.05);
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
}
body:not(.dark) .btn-icon:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.1);
}

body:not(.dark) .theme-toggle:hover {
    background: rgba(0,0,0,0.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

body.dark .moon-icon { display: none; }
body:not(.dark) .sun-icon { display: none; }

/* Dashboard Layout */
.dashboard {
    display: grid;
    grid-template-columns: 350px 1fr;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    padding: 1.5rem;
    overflow-y: auto;
    border-radius: 0;
    border-top: none;
    border-bottom: none;
    border-left: none;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}
.sidebar::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 6px;
}

.main-content {
    padding: 1.5rem 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.settings-group h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h2 {
    margin-bottom: 0;
}

.tier-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--glass-border);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

/* Form Elements */
.input-group {
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.input-group label {
    font-size: 0.875rem;
    color: var(--text-main);
}

.input-block {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.input-block label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

input[type="number"], input[type="text"] {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.4rem 0.5rem;
    border-radius: 6px;
    font-family: inherit;
    width: 100px;
    text-align: right;
    transition: var(--transition);
}

input[type="text"] {
    text-align: left;
    width: 100%;
}

body:not(.dark) input[type="number"],
body:not(.dark) input[type="text"] {
    background: rgba(255,255,255,0.5);
}

input:focus {
    outline: none;
    border-color: var(--primary);
}

/* Toggle Switch */
.toggle-switch-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.toggle-switch-wrapper .label {
    font-size: 0.875rem;
}

.toggle-switch {
    position: relative;
    width: 140px;
    height: 32px;
}

.toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-label {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--slate-800);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    border: 1px solid var(--glass-border);
}

body:not(.dark) .toggle-label { background-color: var(--slate-300); }

.toggle-text-left, .toggle-text-right {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    z-index: 2;
    transition: color 0.3s ease;
}

.toggle-label::after {
    content: "";
    position: absolute;
    height: 24px;
    width: 66px;
    left: 3px;
    bottom: 3px;
    background-color: var(--primary);
    border-radius: 12px;
    transition: .3s;
    z-index: 1;
}

.toggle-input:checked + .toggle-label::after {
    transform: translateX(66px);
}

.toggle-input:not(:checked) + .toggle-label .toggle-text-left { color: white; }
.toggle-input:checked + .toggle-label .toggle-text-right { color: white; }
body:not(.dark) .toggle-input:not(:checked) + .toggle-label .toggle-text-left { color: white; }
body:not(.dark) .toggle-input:checked + .toggle-label .toggle-text-right { color: white; }

/* Tiers */
.tiers-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tier-card {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 1rem;
    position: relative;
}

body:not(.dark) .tier-card {
    background: rgba(0,0,0,0.02);
}

.tier-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.tier-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.tier-inputs.full {
    grid-template-columns: 1fr;
    margin-top: 0.75rem;
}

.tier-card input {
    width: 100%;
}

.add-tier-btn {
    width: 100%;
    padding: 0.75rem;
    border: 1px dashed var(--glass-border);
    background: transparent;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.add-tier-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(16, 185, 129, 0.05);
}

/* Main Content Metrics */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.metric-card {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.metric-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    font-weight: 500;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
}

#metricMrr, #metricArr {
    color: var(--primary);
}

/* Charts */
.charts-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
    flex: 1;
    min-height: 400px;
}

.chart-card {
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
}

.chart-header {
    margin-bottom: 1rem;
}

.chart-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.chart-body {
    flex: 1;
    position: relative;
    width: 100%;
    min-height: 250px;
}

.doughnut-body {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

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

@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
        overflow-y: auto;
    }
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
    }
    .app-wrapper {
        height: auto;
    }
}