/* ============================================
   AP Automation Suite - Enterprise Theme
   Clean, Professional, Data-Focused Design
   ============================================ */

/* CSS Variables - Enterprise Color Palette */
:root {
    /* Primary Colors - Neutral Professional */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f5;

    /* Text Colors */
    --color-text-primary: #212529;
    --color-text-secondary: #495057;
    --color-text-tertiary: #868e96;
    --color-text-inverse: #ffffff;

    /* Border Colors */
    --color-border-light: #e9ecef;
    --color-border-medium: #dee2e6;
    --color-border-dark: #ced4da;

    /* Accent Colors - Subtle Corporate Blue */
    --color-accent-primary: #228be6;
    --color-accent-primary-hover: #1c7ed6;
    --color-accent-light: #e7f5ff;

    /* Status Colors */
    --color-success: #2f9e44;
    --color-success-light: #ebfbee;
    --color-warning: #f59f00;
    --color-warning-light: #fff9db;
    --color-error: #e03131;
    --color-error-light: #fff5f5;

    /* Spacing Scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 24px;

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 6px;
    --border-radius-lg: 8px;

    /* Shadows - Subtle */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    min-height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ============================================
   Header
   ============================================ */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-light);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-accent-primary);
    color: var(--color-text-inverse);
    border-radius: var(--border-radius-md);
}

.brand-text h1 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.brand-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-success);
    border-radius: 50%;
}

/* ============================================
   Main Content
   ============================================ */
.app-main {
    flex: 1;
    padding: var(--space-xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Section Header */
.section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.section-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.section-description {
    font-size: var(--font-size-md);
    color: var(--color-text-tertiary);
    margin-top: var(--space-xs);
}

.section-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ============================================
   Upload Section
   ============================================ */
.upload-section {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
}

.upload-zone {
    border: 2px dashed var(--color-border-medium);
    border-radius: var(--border-radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.upload-zone:hover {
    border-color: var(--color-accent-primary);
    background-color: var(--color-accent-light);
}

.upload-zone.drag-over {
    border-color: var(--color-accent-primary);
    background-color: var(--color-accent-light);
}

.upload-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.upload-icon {
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
}

.upload-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text-primary);
}

.upload-subtext {
    font-size: var(--font-size-md);
    color: var(--color-text-tertiary);
}

.upload-constraints {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--space-md);
}

.separator {
    color: var(--color-border-medium);
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    margin-top: var(--space-md);
}

.file-info-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.file-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
}

.file-details {
    display: flex;
    flex-direction: column;
}

.file-name {
    font-weight: 500;
    color: var(--color-text-primary);
}

.file-size {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* Processing State */
.processing-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-2xl);
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border-light);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.processing-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-top: var(--space-md);
}

.processing-subtext {
    font-size: var(--font-size-md);
    color: var(--color-text-tertiary);
    margin-top: var(--space-xs);
}

/* ============================================
   Verification Section
   ============================================ */
.verification-section {
    margin-top: var(--space-xl);
}

.verification-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

@media (max-width: 1024px) {
    .verification-grid {
        grid-template-columns: 1fr;
    }
}

/* Panels */
.panel {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.panel-header h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-text-primary);
}

.panel-actions {
    display: flex;
    gap: var(--space-xs);
}

.panel-body {
    flex: 1;
    padding: var(--space-lg);
    overflow-y: auto;
}

/* Document Preview */
.document-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-md);
    min-height: 500px;
    overflow: hidden;
}

.document-preview img {
    max-width: 100%;
    max-height: 600px;
    object-fit: contain;
}

/* Validation Status */
.validation-status {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.validation-status.valid {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

.validation-status.invalid {
    background-color: var(--color-error-light);
    color: var(--color-error);
}

.validation-status.valid .validation-icon::before {
    content: "✓";
}

.validation-status.invalid .validation-icon::before {
    content: "✕";
}

/* ============================================
   Data Groups & Fields
   ============================================ */
.data-group {
    margin-bottom: var(--space-lg);
}

.data-group:last-child {
    margin-bottom: 0;
}

.data-group-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.data-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.field {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.field-full {
    grid-column: 1 / -1;
}

.field label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.field-input {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-md);
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-medium);
    border-radius: var(--border-radius-sm);
    transition: border-color var(--transition-fast);
}

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

.field-input.error {
    border-color: var(--color-error);
    background-color: var(--color-error-light);
}

/* ============================================
   Line Items Table
   ============================================ */
.line-items-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
}

.line-items-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.line-items-table th {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-light);
}

.line-items-table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
}

.line-items-table tbody tr:last-child td {
    border-bottom: none;
}

.line-items-table tbody tr:hover {
    background-color: var(--color-bg-secondary);
}

.line-items-table input {
    width: 100%;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-sm);
    border: 1px solid transparent;
    border-radius: var(--border-radius-sm);
    background-color: transparent;
}

.line-items-table input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    background-color: var(--color-bg-primary);
}

.col-description {
    width: 40%;
}

.col-qty {
    width: 12%;
    text-align: right;
}

.col-price {
    width: 18%;
    text-align: right;
}

.col-total {
    width: 18%;
    text-align: right;
}

.col-actions {
    width: 12%;
    text-align: center;
}

.col-qty input,
.col-price input,
.col-total input {
    text-align: right;
}

/* ============================================
   Totals Section
   ============================================ */
.totals-group {
    background-color: var(--color-bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--border-radius-md);
    margin-top: var(--space-lg);
}

.totals-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.total-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.total-row label {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
}

.total-row-grand label {
    font-weight: 600;
    color: var(--color-text-primary);
}

.total-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.currency-prefix {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

.total-input {
    width: 150px;
    text-align: right;
}

.total-row-grand .total-input {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

/* Validation Messages */
.validation-messages {
    margin-top: var(--space-md);
}

.validation-message {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
}

.validation-message:last-child {
    margin-bottom: 0;
}

.validation-message.error {
    background-color: var(--color-error-light);
    color: var(--color-error);
}

.validation-message.warning {
    background-color: var(--color-warning-light);
    color: var(--color-warning);
}

.validation-message.success {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-md);
    font-weight: 500;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--color-accent-primary);
    color: var(--color-text-inverse);
}

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

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

.btn-secondary:hover {
    background-color: var(--color-bg-secondary);
}

.btn-text {
    background-color: transparent;
    color: var(--color-accent-primary);
    padding: var(--space-sm) 0;
}

.btn-text:hover {
    color: var(--color-accent-primary-hover);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background-color: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

/* ============================================
   Footer
   ============================================ */
.app-footer {
    padding: var(--space-md) var(--space-xl);
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    border-top: 1px solid var(--color-border-light);
    background-color: var(--color-bg-primary);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
}

.toast[hidden] {
    display: none;
}

.toast-icon {
    display: flex;
    color: var(--color-error);
}

.toast-message {
    font-size: var(--font-size-md);
}

.toast-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    color: var(--color-text-inverse);
    opacity: 0.7;
    cursor: pointer;
    margin-left: var(--space-sm);
}

.toast-close:hover {
    opacity: 1;
}

/* ============================================
   Utility Classes
   ============================================ */
[hidden] {
    display: none !important;
}

/* ============================================
   Mobile Responsive Styles
   ============================================ */

/* Tablet (768px and below) */
@media (max-width: 768px) {

    /* Header */
    .app-header {
        padding: var(--space-sm) var(--space-md);
        flex-wrap: wrap;
        gap: var(--space-sm);
    }

    .brand-icon {
        width: 36px;
        height: 36px;
    }

    .brand-text h1 {
        font-size: var(--font-size-md);
    }

    .brand-subtitle {
        display: none;
    }

    .status-indicator .status-text {
        display: none;
    }

    /* Main Content */
    .app-main {
        padding: var(--space-md);
    }

    /* Section Header */
    .section-header {
        flex-direction: column;
        gap: var(--space-md);
    }

    .section-actions {
        width: 100%;
    }

    .section-actions .btn {
        flex: 1;
    }

    /* Upload Section */
    .upload-section {
        padding: var(--space-md);
    }

    .upload-zone {
        padding: var(--space-lg);
    }

    .upload-icon svg {
        width: 36px;
        height: 36px;
    }

    .upload-text {
        font-size: var(--font-size-md);
    }

    /* File Info */
    .file-info {
        flex-direction: column;
        gap: var(--space-md);
        align-items: stretch;
    }

    .file-info .btn {
        width: 100%;
    }

    /* Data Fields */
    .data-fields {
        grid-template-columns: 1fr;
    }

    /* Panel */
    .panel-header {
        padding: var(--space-sm) var(--space-md);
        flex-wrap: wrap;
        gap: var(--space-sm);
    }

    .panel-body {
        padding: var(--space-md);
    }

    /* Line Items Table */
    .line-items-table-wrapper {
        margin: 0 calc(-1 * var(--space-md));
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    .line-items-table {
        font-size: var(--font-size-xs);
    }

    .line-items-table th,
    .line-items-table td {
        padding: var(--space-xs) var(--space-sm);
    }

    .col-description {
        width: 35%;
    }

    .col-qty {
        width: 15%;
    }

    .col-price {
        width: 20%;
    }

    .col-total {
        width: 20%;
    }

    .col-actions {
        width: 10%;
    }

    /* Totals */
    .totals-group {
        padding: var(--space-md);
    }

    .total-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-xs);
    }

    .total-input-wrapper {
        justify-content: flex-end;
    }

    .total-input {
        width: 120px;
    }

    /* Footer */
    .app-footer {
        padding: var(--space-sm) var(--space-md);
    }

    /* Toast */
    .toast {
        left: var(--space-md);
        right: var(--space-md);
        bottom: var(--space-md);
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    :root {
        --space-xl: 24px;
        --space-2xl: 32px;
    }

    /* Header */
    .app-header {
        padding: var(--space-xs) var(--space-sm);
    }

    .header-brand {
        gap: var(--space-sm);
    }

    .brand-icon {
        width: 32px;
        height: 32px;
    }

    .brand-icon svg {
        width: 18px;
        height: 18px;
    }

    .brand-text h1 {
        font-size: var(--font-size-sm);
    }

    .status-indicator {
        padding: var(--space-xs);
    }

    /* Main Content */
    .app-main {
        padding: var(--space-sm);
    }

    /* Section Header */
    .section-header h2 {
        font-size: var(--font-size-lg);
    }

    .section-description {
        font-size: var(--font-size-sm);
    }

    /* Upload */
    .upload-section {
        padding: var(--space-sm);
    }

    .upload-zone {
        padding: var(--space-md);
    }

    .upload-icon svg {
        width: 32px;
        height: 32px;
    }

    .upload-text {
        font-size: var(--font-size-sm);
    }

    .upload-subtext {
        font-size: var(--font-size-xs);
    }

    .upload-constraints {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .upload-constraints .separator {
        display: none;
    }

    /* Buttons */
    .btn {
        padding: var(--space-sm);
        font-size: var(--font-size-sm);
    }

    .section-actions {
        flex-direction: column;
    }

    /* Data Groups */
    .data-group-title {
        font-size: var(--font-size-xs);
    }

    .field label {
        font-size: var(--font-size-xs);
    }

    .field-input {
        padding: var(--space-xs) var(--space-sm);
        font-size: var(--font-size-sm);
    }

    /* Line Items - Card Layout on Mobile */
    .line-items-table thead {
        display: none;
    }

    .line-items-table,
    .line-items-table tbody,
    .line-items-table tr,
    .line-items-table td {
        display: block;
        width: 100%;
    }

    .line-items-table tr {
        padding: var(--space-sm);
        border-bottom: 1px solid var(--color-border-light);
        position: relative;
    }

    .line-items-table td {
        padding: var(--space-xs) 0;
        border: none;
        text-align: left !important;
    }

    .line-items-table td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: var(--font-size-xs);
        color: var(--color-text-tertiary);
        display: block;
        margin-bottom: var(--space-xs);
    }

    .line-items-table td.col-actions {
        position: absolute;
        top: var(--space-sm);
        right: 0;
        width: auto;
    }

    .line-items-table input {
        width: 100%;
        text-align: left !important;
    }

    /* Totals */
    .total-input {
        width: 100px;
        font-size: var(--font-size-sm);
    }

    .total-row-grand .total-input {
        font-size: var(--font-size-md);
    }

    /* Validation Messages */
    .validation-message {
        font-size: var(--font-size-xs);
        padding: var(--space-xs) var(--space-sm);
    }

    /* Document Preview */
    .document-preview {
        min-height: 300px;
    }

    /* Panels */
    .panel-header h3 {
        font-size: var(--font-size-sm);
    }
}

/* Extra small devices (320px and below) */
@media (max-width: 320px) {
    .brand-text h1 {
        font-size: 11px;
    }

    .upload-text {
        font-size: var(--font-size-xs);
    }

    .btn {
        font-size: var(--font-size-xs);
        padding: var(--space-xs) var(--space-sm);
    }
}