@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    /* Sophisticated Professional Palette */
    --primary: #0f172a;
    --primary-light: #1e293b;
    --accent: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.15);
    --accent-gold: #b45309;
    --success: #059669;
    --danger: #dc2626;

    /* Neutral Palette */
    --bg-main: #f8fafc;
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.8);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-on-accent: #ffffff;

    /* Borders & Decorations */
    --border: #e2e8f0;
    --border-focus: #3b82f6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* Spacing & Radius */
    --radius-sm: 0.5rem;
    --radius: 1rem;
    --radius-lg: 1.5rem;
    --container-width: 1000px;
}

/* Base Reset & Typography */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-main);
    background-image:
        radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(180, 83, 9, 0.05) 0px, transparent 50%);
    color: var(--text-main);
    line-height: 1.6;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1,
h2,
h3,
h4 {
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.02em;
}

/* Navigation / Control Panel - Glassmorphism */
.controls-panel {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: var(--container-width);
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 1rem;
    z-index: 100;
}

.toggle-group {
    display: flex;
    background: #f1f5f9;
    padding: 0.4rem;
    border-radius: 0.75rem;
    gap: 0.25rem;
}

.toggle-btn {
    padding: 0.6rem 1.25rem;
    border: none;
    background: transparent;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.toggle-btn.active {
    background: var(--surface);
    color: var(--accent);
    box-shadow: var(--shadow);
}

.toggle-btn:hover:not(.active) {
    color: var(--primary);
    background: rgba(255, 255, 255, 0.5);
}

.action-btns {
    display: flex;
    gap: 0.75rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: #f8fafc;
    border-color: var(--text-muted);
    transform: translateY(-1px);
}

/* Document Card Styling */
.app-container {
    max-width: var(--container-width);
    width: 100%;
    margin-bottom: 5rem;
    perspective: 1000px;
}

.document-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.02);
    padding: 4.5rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.4s ease;
}

/* PAID Status Box - Branding */
.summary-section {
    display: flex;
    justify-content: flex-end;
    align-items: flex-end;
    gap: 3rem;
    margin-bottom: 5rem;
}

.status-box {
    display: none;
    margin-bottom: 1rem;
}

.is-paid .status-box {
    display: block;
}

.paid-badge {
    border: 4px solid var(--primary);
    color: var(--primary);
    padding: 0.6rem 2rem;
    font-size: 2.2rem;
    font-weight: 950;
    text-transform: uppercase;
    font-family: 'Outfit', sans-serif;
    letter-spacing: 0.15em;
    transform: rotate(-12deg);
    border-radius: 0.5rem;
    box-shadow: 0 0 0 4px white, 0 0 0 6px var(--primary);
}

/* Terms & Conditions */
.terms-section {
    margin-bottom: 3rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
}

.terms-section h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: 0.75rem;
}

.terms-section ol {
    padding-left: 1.25rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.terms-section li {
    margin-bottom: 0.4rem;
}

/* Hide Terms on Receipt */
.is-receipt .terms-section {
    display: none;
}

/* Date Input Styling */
input[type="date"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    filter: invert(40%) sepia(10%) saturate(1000%) hue-rotate(180deg);
    transition: filter 0.2s;
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    filter: invert(20%);
}

/* Professional Header Layout */
.document-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 4rem;
    border-bottom: 4px solid var(--primary);
    padding-bottom: 2rem;
}

.logo-container {
    width: 240px;
}

.logo-container img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.05));
    mix-blend-mode: multiply;
}

.company-info {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.company-info p {
    margin-bottom: 0.2rem;
}

.company-info .reg-no {
    font-weight: 700;
    color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

/* Layout Grid for Info */
.info-section {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.client-info h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.doc-info {
    text-align: right;
}

.doc-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: -0.04em;
    line-height: 0.9;
    margin-bottom: 1.5rem;
}

.field-group {
    margin-bottom: 0.75rem;
}

.field-input {
    width: 100%;
    padding: 0.6rem 0;
    border: none;
    border-bottom: 1px solid transparent;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-main);
    background: transparent;
    transition: all 0.2s;
}

.field-input:hover {
    border-bottom-color: var(--border);
}

.field-input:focus {
    outline: none;
    border-bottom-color: var(--accent);
}

.doc-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.75rem;
}

.meta-item {
    display: flex;
    gap: 1.5rem;
    align-items: baseline;
}

.meta-item .field-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
}

.meta-item .field-input {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    width: 180px;
    text-align: right;
    font-size: 1rem;
}

/* Premium Table Styles */
.items-table-container {
    margin-bottom: 4rem;
    border-radius: var(--radius);
    overflow: hidden;
}

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

.items-table th {
    text-align: left;
    background: var(--primary);
    padding: 1rem 1.25rem;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: white;
}

.items-table td {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.item-row {
    transition: background 0.2s ease;
}

.item-row:hover {
    background: #fbfcfe;
}

.item-row:hover .delete-btn {
    opacity: 1;
}

.delete-btn {
    opacity: 0;
    color: var(--danger);
    background: #fee2e2;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.delete-btn:hover {
    background: var(--danger);
    color: white;
    transform: scale(1.1);
}

.input-cell {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid transparent;
    border-radius: 0.5rem;
    font-size: 1rem;
    background: transparent;
    color: var(--text-main);
    transition: all 0.2s;
}

.input-cell:hover {
    background: rgba(0, 0, 0, 0.02);
}

.input-cell:focus {
    outline: none;
    border-color: var(--accent);
    background: white;
    box-shadow: var(--shadow-sm);
}

.item-desc {
    font-weight: 500;
}

.subtotal-cell {
    font-weight: 600;
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
    color: var(--primary);
    padding-top: 1.85rem !important;
}

.add-item-btn {
    margin-top: 1.5rem;
    color: var(--accent);
    background: var(--accent-glow);
    border: 1px dashed var(--accent);
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
    justify-content: center;
    transition: all 0.2s;
}

.add-item-btn:hover {
    background: var(--accent);
    color: white;
    border-style: solid;
}

/* Refined Summary Section */
.summary-section {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 5rem;
}

.summary-card {
    width: 350px;
    background: #f8fafc;
    padding: 2rem;
    border-radius: var(--radius);
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 0.6rem 0;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.summary-row span:last-child {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    color: var(--primary);
}

.summary-row.total {
    border-top: 2px solid var(--primary);
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.summary-row.total span:last-child {
    color: var(--accent);
}

/* Modern Footer & Signatures */
.footer-section {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    margin-top: 4rem;
    border-top: 1px solid var(--border);
    padding-top: 3rem;
}

.payment-info {
    background: #f1f5f9;
    padding: 2rem;
    border-radius: var(--radius);
}

.payment-info h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.bank-details {
    font-weight: 700;
    color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    display: block;
    margin-bottom: 0.25rem;
}

.signature-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
}

.signature-line {
    width: 100%;
    max-width: 300px;
    border-top: 2px solid var(--primary);
    margin-top: 5rem;
    text-align: center;
    padding-top: 0.75rem;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
}

/* Enhanced Autocomplete */
.autocomplete-items {
    position: absolute;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    z-index: 1000;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--shadow-lg);
    margin-top: 0.5rem;
    overflow: hidden;
}

.autocomplete-items div {
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    border-bottom: 1px solid #f1f5f9;
    color: var(--text-main);
    transition: all 0.2s;
}

.autocomplete-items div:hover {
    background-color: #f8fafc;
    color: var(--accent);
}

.autocomplete-active {
    background-color: var(--primary) !important;
    color: white !important;
}

/* Modern Modal History */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal {
    background: white;
    width: 90%;
    max-width: 650px;
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.history-list {
    overflow-y: auto;
    margin: 1.5rem 0;
    padding-right: 0.5rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 1rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.history-item:hover {
    border-color: var(--accent);
    background: #f8fafc;
    transform: translateX(4px);
}

/* Print Optimization */
@media print {
    body {
        padding: 0;
        background: white !important;
        background-image: none !important;
    }

    .controls-panel,
    .add-item-btn,
    .delete-btn,
    .modal-overlay {
        display: none !important;
    }

    .document-card {
        box-shadow: none !important;
        padding: 0 !important;
        margin: 0 !important;
        border-radius: 0 !important;
    }

    .app-container {
        margin: 0 !important;
        max-width: 100% !important;
    }

    .field-input,
    .input-cell {
        border: none !important;
        padding-left: 0 !important;
        padding-right: 0 !important;
    }

    .items-table th {
        background: #000 !important;
        color: #fff !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .summary-card {
        background: #f8fafc !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .is-do .summary-section {
        display: none !important;
    }
}

/* Preview Mode */
.preview-mode {
    background: #1e293b;
    background-image: none;
}

.preview-mode .controls-panel,
.preview-mode .delete-btn,
.preview-mode .add-item-btn {
    display: none !important;
}

.preview-mode .field-input,
.preview-mode .input-cell {
    border: none !important;
    background: transparent !important;
    pointer-events: none;
    padding-left: 0;
    padding-right: 0;
}

.preview-mode .document-card {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    margin-top: 5rem;
    transform: scale(0.95);
}

.preview-controls {
    position: fixed;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    display: flex;
    gap: 1rem;
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    padding: 1rem 2rem;
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.preview-mode .preview-controls {
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 800px) {
    body {
        padding: 1rem;
    }

    .document-card {
        padding: 2rem;
    }

    .info-section,
    .footer-section {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .doc-info {
        text-align: left;
    }

    .doc-meta {
        align-items: flex-start;
    }

    .controls-panel {
        flex-direction: column;
        gap: 1rem;
        position: static;
    }
}

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

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

.document-card {
    animation: fadeIn 0.6s ease-out;
}