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

:root {
    --bg-gradient: linear-gradient(135deg, #f4f7f6 0%, #e8efeb 100%);
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(255, 255, 255, 0.5);
    --card-shadow: 0 8px 32px 0 rgba(160, 180, 170, 0.15);
    --text-primary: #2d3732;
    --text-secondary: #607067;
    --color-teal: #0d9488;
    --color-teal-light: rgba(13, 148, 136, 0.1);
    --color-mint: #10b981;
    --color-mint-light: rgba(16, 185, 129, 0.1);
    --color-warm: #f59e0b;
    --color-warm-light: rgba(245, 158, 11, 0.1);
    --color-rose: #f43f5e;
    --color-rose-light: rgba(244, 63, 94, 0.1);
    --color-slate: #64748b;
    --border-radius: 16px;
    --transition-speed: 0.25s;
}

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

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

/* Glassmorphism Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}
::-webkit-scrollbar-thumb {
    background: rgba(13, 148, 136, 0.2);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(13, 148, 136, 0.4);
}

/* Container & Sidebar layout */
#app-layout {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

aside {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-right: 1px solid var(--glass-border);
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--color-teal);
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item button {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 1rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all var(--transition-speed) ease;
}

.nav-item button:hover, .nav-item.active button {
    background: var(--color-teal-light);
    color: var(--color-teal);
    transform: translateX(4px);
}

.nav-item.active button {
    font-weight: 600;
}

/* Main Content Area */
main {
    flex: 1;
    margin-left: 280px;
    padding: 2.5rem 3.5rem;
    overflow-y: auto;
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

/* Glass Cards */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--card-shadow);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(160, 180, 170, 0.22);
}

/* Stat Grid */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    padding: 1.5rem;
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

/* Data Tables */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    padding: 1rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid rgba(0, 0, 0, 0.03);
}

td {
    padding: 1.25rem;
    font-size: 0.95rem;
    color: var(--text-primary);
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: rgba(255, 255, 255, 0.25);
}

/* Badges / Pill Tags */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-paid {
    background: var(--color-mint-light);
    color: var(--color-mint);
}

.badge-partial {
    background: var(--color-warm-light);
    color: var(--color-warm);
}

.badge-unpaid {
    background: var(--color-rose-light);
    color: var(--color-rose);
}

.badge-default {
    background: rgba(100, 116, 139, 0.1);
    color: var(--color-slate);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

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

.btn-primary:hover {
    background: #0f766e;
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.btn-secondary {
    background: var(--color-teal-light);
    color: var(--color-teal);
}

.btn-secondary:hover {
    background: rgba(13, 148, 136, 0.18);
}

.btn-danger {
    background: var(--color-rose-light);
    color: var(--color-rose);
}

.btn-danger:hover {
    background: rgba(244, 63, 94, 0.2);
}

.btn-icon {
    padding: 0.5rem;
    border-radius: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--text-primary);
}

/* Forms & Modal */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    font-size: 0.95rem;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-primary);
    transition: all var(--transition-speed) ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-teal);
    background: white;
    box-shadow: 0 0 0 4px var(--color-teal-light);
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(45, 55, 50, 0.4);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--glass-border);
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
    border-radius: 20px;
    width: 100%;
    max-width: 580px;
    max-height: 85vh;
    overflow-y: auto;
    padding: 2.5rem;
    transform: scale(0.95);
    transition: transform var(--transition-speed) ease;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 700;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.form-grid-full {
    grid-column: span 2;
}

/* Ageing Analysis Blocks */
.ageing-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.ageing-card {
    padding: 1.5rem;
    border-radius: 14px;
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.ageing-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.ageing-amount {
    font-size: 1.5rem;
    font-weight: 700;
}