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

:root {
    --primary: #000000;
    --secondary: #f4f4f4;
    --text-main: #1a1a1a;
    --text-muted: #666666;
    --bg-app: #fafafa;
    --bg-card: #ffffff;
    --border: #e0e0e0;
    --border-dark: #000000;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.05);
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 0 20px;
}

.header-logo a {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
    text-transform: uppercase;
}

.header-nav {
    display: flex;
    gap: 10px;
}

.header-nav a {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 6px;
    color: var(--text-muted);
}

.header-nav a:hover {
    color: var(--primary);
    background: var(--secondary);
}

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

.header-user {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 14px;
}

/* Cards & Sections */
.section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 30px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.section-header h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card p {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.stat-card h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

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

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.2s;
    background: #fff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-actions {
    margin-top: 30px;
    display: flex;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    opacity: 0.85;
}

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

.btn-secondary:hover {
    background: #ebebeb;
}

.btn-danger {
    background: #ff4d4f;
    color: #fff;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.data-table th {
    background: var(--secondary);
    padding: 14px 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table td {
    padding: 16px 20px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
    background: #fdfdfd;
}

/* Badges */
.status-badge {
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
}

.status-paid { background: #e6f7ff; color: #1890ff; border: 1px solid #91d5ff; }
.status-sent { background: #f6ffed; color: #52c41a; border: 1px solid #b7eb8f; }
.status-draft { background: #f5f5f5; color: #8c8c8c; border: 1px solid #d9d9d9; }
.status-overdue { background: #fff1f0; color: #f5222d; border: 1px solid #ffa39e; }

.type-badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    margin-left: 5px;
}
.type-gst { background: #000; color: #fff; }
.type-standard { background: #eee; color: #555; }

/* Auth Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-app);
}

.auth-box {
    width: 100%;
    max-width: 420px;
    background: #fff;
    padding: 50px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
}

.auth-box h1 {
    font-size: 20px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.auth-box h2 {
    font-size: 15px;
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.auth-link {
    margin-top: 30px;
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
}

.auth-link a {
    color: var(--primary);
    font-weight: 600;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
}

.alert-error { background: #fff1f0; color: #cf1322; border: 1px solid #ffa39e; }
.alert-success { background: #f6ffed; color: #389e0d; border: 1px solid #b7eb8f; }

/* Responsive */
@media (max-width: 768px) {
    .header-container { height: auto; padding: 20px; flex-direction: column; gap: 15px; }
    .header-nav { flex-wrap: wrap; justify-content: center; }
    .form-row { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; }
    .section { padding: 20px; }
}

/* Margin Scheme specific items */
.item-wrapper {
    background: #fafafa;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.invoice-item-gst {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr auto;
    gap: 15px;
    align-items: start;
}

.margin-fields {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed var(--border);
    display: flex;
    align-items: center;
    gap: 20px;
}