:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #ff9f1c;
    --background-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-main: #212529;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: #1e1e2d;
    color: #fff;
    padding: 20px 15px;
    position: fixed;
    height: 100vh;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar.collapsed {
    width: 80px;
    padding: 20px 10px;
}

.sidebar.collapsed:hover {
    width: 260px;
    padding: 20px 15px;
    box-shadow: 10px 0 30px rgba(0,0,0,0.2);
}


.sidebar .logo {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 30px;
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    padding-right: 25px;
}


.sidebar .logo .logo-text {
    color: var(--primary-color);
    transition: opacity 0.3s;
}

.sidebar.collapsed .logo .logo-text {
    opacity: 0;
    width: 0;
    display: none;
}

.sidebar.collapsed:hover .logo .logo-text {
    opacity: 1;
    width: auto;
    display: inline;
}



.sidebar .toggle-btn {
    position: absolute;
    right: 12px;
    top: 12px;
    cursor: pointer;
    background: rgba(255,255,255,0.08);
    border: none;
    color: #fff;
    width: 26px;
    height: 26px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    z-index: 10;
}

.sidebar.collapsed .toggle-btn {
    right: 50%;
    transform: translateX(50%);
    top: 10px;
}

.sidebar.collapsed .logo {
    margin-top: 45px;
    padding-right: 0;
    justify-content: center;
}



.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 10px;
}

.nav-links a {
    color: #a2a3b7;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    border-radius: 8px;
    transition: all 0.2s;
    white-space: nowrap;
}

.sidebar.collapsed .nav-links a {
    padding: 12px 0;
    justify-content: center;
    gap: 0;
}

.sidebar.collapsed .nav-links a span {
    display: none;
}

.sidebar.collapsed:hover .nav-links a span {
    display: inline;
}

.sidebar.collapsed:hover .nav-links a {
    padding: 12px 15px;
    justify-content: flex-start;
    gap: 12px;
}

.sidebar.collapsed .nav-info {
    display: none;
}

.sidebar.collapsed:hover .nav-info {
    display: block;
}


.nav-links a:hover, .nav-links a.active {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.nav-links a.active {
    background: var(--primary-color);
}

/* Main Content */
.main-content {
    margin-left: 260px;
    flex: 1;
    padding: 30px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-content.sidebar-collapsed {
    margin-left: 80px;
}


.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 24px;
    font-weight: 700;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.stat-card h3 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.stat-card .value {
    font-size: 28px;
    font-weight: 800;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 15px;
    border-bottom: 1px solid #f1f1f1;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.2s, opacity 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-secondary {
    background: #e9ecef;
    color: var(--text-main);
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    outline: none;
    transition: border-color 0.2s;
}

.form-control:focus {
    border-color: var(--primary-color);
}

/* Specific Table Form Controls */
#itemsTable td {
    padding: 10px 5px;
}

#itemsTable .form-control {
    padding: 8px 10px;
    font-size: 14px;
}

#itemsTable .qty {
    min-width: 70px;
}

#itemsTable .rate {
    min-width: 100px;
}

#itemsTable .gst-rate {
    min-width: 80px;
}

#itemsTable .item-total {
    min-width: 110px;
    background-color: #f8f9fa;
    font-weight: 600;
}


/* Invoice UI */
.invoice-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-gst { background: #e3f2fd; color: #1976d2; }
.badge-no-gst { background: #f5f5f5; color: #616161; }