/* ============================================================
           CSS CUSTOM PROPERTIES
           ============================================================ */
        :root {
            --color-primary: #1a73e8;
            --color-primary-hover: #1557b0;
            --color-primary-light: #e8f0fe;
            --color-success: #0f9d58;
            --color-success-light: #e6f4ea;
            --color-warning: #f4b400;
            --color-warning-light: #fef7e0;
            --color-error: #db4437;
            --color-error-light: #fce8e6;
            --color-info: #4285f4;
            --color-info-light: #e8f0fe;
            --color-bg: #f1f3f4;
            --color-surface: #ffffff;
            --color-surface-alt: #f8f9fa;
            --color-text: #202124;
            --color-text-secondary: #5f6368;
            --color-text-muted: #80868b;
            --color-border: #dadce0;
            --color-border-light: #e8eaed;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.06);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.08);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.18);
            --radius-xs: 4px;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --radius-full: 50%;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Courier New', monospace;
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.4s ease;
            --max-width: 1100px;
            --header-height: 64px;
        }

        /* ============================================================
           DARK THEME
           ============================================================ */
        body.theme-dark {
            --color-primary: #8ab4f8;
            --color-primary-hover: #aecbfa;
            --color-primary-light: #1a2a4a;
            --color-success: #34a853;
            --color-success-light: #0d2818;
            --color-warning: #fdd663;
            --color-warning-light: #332b10;
            --color-error: #f28b82;
            --color-error-light: #3c1518;
            --color-info: #8ab4f8;
            --color-info-light: #1a2a4a;
            --color-bg: #0f0f1a;
            --color-surface: #1a1a2e;
            --color-surface-alt: #12122a;
            --color-text: #e8eaed;
            --color-text-secondary: #9aa0a6;
            --color-text-muted: #6e7681;
            --color-border: #2d2d4a;
            --color-border-light: #1e1e38;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.4);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.5), 0 1px 2px rgba(0,0,0,0.4);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.5), 0 2px 4px rgba(0,0,0,0.4);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.6), 0 4px 10px rgba(0,0,0,0.5);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.7);
            color-scheme: dark;
        }

        /* ============================================================
           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;
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ============================================================
           HEADER
           ============================================================ */
        .header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 0 24px;
            height: var(--header-height);
            display: flex;
            align-items: center;
            gap: 14px;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-xs);
        }

        .header__logo {
            width: 42px;
            height: 42px;
            background: var(--color-primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 20px;
            flex-shrink: 0;
        }

        .header__title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: -0.3px;
        }

        .header__subtitle {
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            font-weight: 400;
            display: block;
        }

        /* Header controls (theme + language) */
        .header__controls {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: auto;
            flex-shrink: 0;
        }

        .theme-toggle {
            width: 38px;
            height: 38px;
            border: none;
            background: none;
            border-radius: var(--radius-full);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--color-text-secondary);
            transition: background var(--transition-fast), color var(--transition-fast);
        }

        .theme-toggle:hover {
            background: var(--color-bg);
            color: var(--color-text);
        }

        .lang-flags {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .lang-flag {
            width: 32px;
            height: 22px;
            border-radius: 4px;
            cursor: pointer;
            opacity: 0.45;
            transition: opacity var(--transition-fast), transform var(--transition-fast);
            object-fit: cover;
            border: 2px solid transparent;
        }

        .lang-flag:hover {
            opacity: 0.8;
            transform: scale(1.1);
        }

        .lang-flag--active {
            opacity: 1;
            border-color: transparent;
        }

        /* ============================================================
           MAIN CONTAINER
           ============================================================ */
        .container {
            max-width: var(--max-width);
            width: 100%;
            margin: 0 auto;
            padding: 24px 20px 40px;
            flex: 1;
        }

        /* ============================================================
           TAB NAVIGATION
           ============================================================ */
        .tab-nav {
            display: flex;
            gap: 4px;
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 4px;
            box-shadow: var(--shadow-sm);
            margin-bottom: 24px;
        }

        .tab-nav__btn {
            flex: 1;
            padding: 12px 20px;
            border: none;
            background: transparent;
            border-radius: var(--radius-sm);
            font-family: var(--font-sans);
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            white-space: nowrap;
        }

        .tab-nav__btn:hover {
            background: var(--color-surface-alt);
            color: var(--color-text);
        }

        .tab-nav__btn--active {
            background: var(--color-primary);
            color: #fff;
            box-shadow: var(--shadow-sm);
        }

        .tab-nav__btn--active:hover {
            background: var(--color-primary-hover);
            color: #fff;
        }

        .tab-nav__icon { font-size: 1rem; }

        /* ============================================================
           TAB PANELS
           ============================================================ */
        .tab-panel { display: none; }
        .tab-panel--active { display: block; animation: fadeSlideIn 0.3s ease; }

        @keyframes fadeSlideIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ============================================================
           CARDS
           ============================================================ */
        .card {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
        }

        .card + .card { margin-top: 20px; }

        .card__title {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--color-text);
        }

        .card__title i { color: var(--color-primary); font-size: 1.1rem; }

        /* ============================================================
           INPUT GROUPS
           ============================================================ */
        .input-group {
            display: flex;
            gap: 12px;
            align-items: flex-end;
            flex-wrap: wrap;
        }

        .input-wrapper {
            flex: 1;
            min-width: 280px;
        }

        .input-wrapper__label {
            display: block;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            margin-bottom: 6px;
        }

        .input-wrapper__hint {
            font-size: 0.75rem;
            color: var(--color-text-muted);
            margin-top: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .input--chave {
            width: 100%;
            padding: 13px 16px;
            border: 2px solid var(--color-border);
            border-radius: var(--radius-sm);
            font-family: var(--font-mono);
            font-size: 1.1rem;
            letter-spacing: 2px;
            color: var(--color-text);
            background: var(--color-surface-alt);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            outline: none;
        }

        .input--chave:focus {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
            background: var(--color-surface);
        }

        .input--chave--error {
            border-color: var(--color-error);
            animation: shake 0.4s ease;
        }

        .input--chave--error:focus {
            box-shadow: 0 0 0 3px rgba(219,68,55,0.15);
        }

        .input--chave--valid {
            border-color: var(--color-success);
        }

        .input--chave--valid:focus {
            box-shadow: 0 0 0 3px rgba(15,157,88,0.15);
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            20% { transform: translateX(-6px); }
            40% { transform: translateX(6px); }
            60% { transform: translateX(-4px); }
            80% { transform: translateX(4px); }
        }

        .digit-counter {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 500;
            padding: 4px 10px;
            border-radius: var(--radius-xl);
            transition: all var(--transition-fast);
        }

        .digit-counter--incomplete { background: var(--color-warning-light); color: #b06000; }
        .digit-counter--complete { background: var(--color-success-light); color: var(--color-success); }

        /* ============================================================
           BUTTONS
           ============================================================ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border: none;
            border-radius: var(--radius-sm);
            font-family: var(--font-sans);
            font-size: 0.925rem;
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition-fast);
            text-decoration: none;
            white-space: nowrap;
            line-height: 1.4;
        }

        .btn:active { transform: scale(0.97); }

        .btn--primary {
            background: var(--color-primary);
            color: #fff;
        }
        .btn--primary:hover { background: var(--color-primary-hover); box-shadow: var(--shadow-md); }
        .btn--primary:disabled { background: #a8c8f0; cursor: not-allowed; box-shadow: none; }
        body.theme-dark .btn--primary:disabled { background: #3a3a6a; color: #888; }

        .btn--secondary {
            background: var(--color-surface);
            color: var(--color-text);
            border: 2px solid var(--color-border);
        }
        .btn--secondary:hover { background: var(--color-surface-alt); border-color: var(--color-text-muted); }

        .btn--success {
            background: var(--color-success);
            color: #fff;
        }
        .btn--success:hover { background: #0b8043; box-shadow: var(--shadow-md); }

        .btn--icon {
            width: 42px;
            height: 42px;
            padding: 0;
            border-radius: var(--radius-full);
            background: var(--color-surface);
            border: 2px solid var(--color-border);
            color: var(--color-text-secondary);
            font-size: 1rem;
        }
        .btn--icon:hover { background: var(--color-surface-alt); color: var(--color-text); }

        .btn--sm { padding: 8px 16px; font-size: 0.85rem; }

        /* ============================================================
           DROP ZONE
           ============================================================ */
        .drop-zone {
            border: 3px dashed var(--color-border);
            border-radius: var(--radius-md);
            padding: 48px 24px;
            text-align: center;
            cursor: pointer;
            transition: all var(--transition);
            background: var(--color-surface-alt);
            position: relative;
        }

        .drop-zone:hover,
        .drop-zone--dragover {
            border-color: var(--color-primary);
            background: var(--color-primary-light);
            transform: translateY(-1px);
        }

        .drop-zone--dragover {
            border-style: solid;
            box-shadow: var(--shadow-md);
        }

        .drop-zone__icon {
            font-size: 3rem;
            color: var(--color-primary);
            margin-bottom: 16px;
            display: block;
            transition: transform var(--transition);
        }

        .drop-zone--dragover .drop-zone__icon { transform: scale(1.1); }

        .drop-zone__text {
            font-size: 1.05rem;
            font-weight: 500;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .drop-zone__subtext {
            font-size: 0.85rem;
            color: var(--color-text-secondary);
        }

        .drop-zone__file-info {
            margin-top: 16px;
            padding: 10px 16px;
            background: var(--color-success-light);
            color: var(--color-success);
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.9rem;
            display: none;
            align-items: center;
            gap: 8px;
            justify-content: center;
        }

        .drop-zone__file-info--visible { display: flex; }

        /* ============================================================
           PDF VIEWER
           ============================================================ */
        .pdf-section {
            display: none;
            animation: fadeSlideIn 0.4s ease;
        }

        .pdf-section--visible { display: block; }

        .pdf-section__header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 16px;
        }

        .pdf-section__title {
            font-size: 1.05rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .download-bar {
            display: flex;
            align-items: center;
            gap: 14px;
            background: var(--color-success-light);
            border: 1px solid var(--color-success);
            border-radius: var(--radius-md);
            padding: 14px 20px;
            flex-wrap: wrap;
        }

        .download-bar__icon {
            font-size: 1.8rem;
            color: var(--color-success);
            flex-shrink: 0;
        }

        .download-bar__info {
            flex: 1;
            min-width: 150px;
        }

        .download-bar__filename {
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--color-text);
            word-break: break-all;
        }

        .download-bar__status {
            font-size: 0.8rem;
            color: var(--color-success);
            font-weight: 500;
        }

        @media (max-width: 600px) {
            .download-bar {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
        }

        /* ============================================================
           MODAL (CAMERA)
           ============================================================ */
        .modal {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }

        .modal--visible {
            display: flex;
            animation: fadeIn 0.25s ease;
        }

        .modal__backdrop {
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.6);
            backdrop-filter: blur(4px);
        }

        .modal__content {
            position: relative;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-xl);
            width: 95%;
            max-width: 560px;
            max-height: 90vh;
            overflow-y: auto;
            padding: 0;
            animation: scaleIn 0.3s ease;
        }

        @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
        @keyframes scaleIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

        .modal__header {
            padding: 16px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--color-border-light);
        }

        .modal__title {
            font-size: 1rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .modal__close {
            width: 36px;
            height: 36px;
            border: none;
            background: transparent;
            border-radius: var(--radius-full);
            cursor: pointer;
            font-size: 1.2rem;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
        }
        .modal__close:hover { background: var(--color-surface-alt); color: var(--color-text); }

        .modal__body { padding: 20px; }

        .camera-container {
            width: 100%;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: #000;
        }

        .camera-container video {
            width: 100%;
            display: block;
            border-radius: var(--radius-sm);
            transition: transform 0.15s ease;
        }

        #camera-reader {
            width: 100%;
            min-height: 300px;
            position: relative;
        }

        #camera-reader .drawingBuffer {
            display: none;
        }

        .camera-zoom {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 14px;
            padding: 0 4px;
        }

        .camera-zoom__icon {
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            flex-shrink: 0;
        }

        .camera-zoom__slider {
            flex: 1;
            height: 6px;
            -webkit-appearance: none;
            appearance: none;
            background: var(--color-border);
            border-radius: 3px;
            outline: none;
            cursor: pointer;
        }

        .camera-zoom__slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--color-primary);
            cursor: pointer;
            border: 2px solid var(--color-surface);
            box-shadow: var(--shadow-xs);
        }

        .camera-zoom__slider::-moz-range-thumb {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--color-primary);
            cursor: pointer;
            border: 2px solid var(--color-surface);
        }

        .camera-zoom__value {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--color-text-secondary);
            min-width: 36px;
            text-align: center;
            flex-shrink: 0;
        }

        .camera-controls {
            display: flex;
            gap: 10px;
            margin-top: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .camera-status {
            text-align: center;
            margin-top: 12px;
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            min-height: 20px;
        }

        /* ============================================================
           LOADING OVERLAY
           ============================================================ */
        .loading-overlay {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 1100;
            background: rgba(255,255,255,0.85);
            backdrop-filter: blur(4px);
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 20px;
        }

        .loading-overlay--visible { display: flex; }

        .spinner {
            width: 48px;
            height: 48px;
            border: 4px solid var(--color-border);
            border-top-color: var(--color-primary);
            border-radius: var(--radius-full);
            animation: spin 0.8s linear infinite;
        }

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

        .loading-text {
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-text);
        }

        /* ============================================================
           TOAST NOTIFICATIONS
           ============================================================ */
        .toast-container {
            position: fixed;
            bottom: 24px;
            right: 24px;
            z-index: 1200;
            display: flex;
            flex-direction: column-reverse;
            gap: 10px;
            max-width: 420px;
            width: calc(100% - 48px);
        }

        .toast {
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-lg);
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 0.9rem;
            line-height: 1.5;
            animation: toastSlideIn 0.35s ease;
            cursor: pointer;
            border-left: 4px solid transparent;
        }

        @keyframes toastSlideIn {
            from { opacity: 0; transform: translateX(80px); }
            to { opacity: 1; transform: translateX(0); }
        }

        .toast--removing {
            animation: toastSlideOut 0.3s ease forwards;
        }

        @keyframes toastSlideOut {
            from { opacity: 1; transform: translateX(0); }
            to { opacity: 0; transform: translateX(80px); }
        }

        .toast--success { background: #e6f4ea; color: #0b5e2e; border-left-color: var(--color-success); }
        .toast--error { background: #fce8e6; color: #a50e0e; border-left-color: var(--color-error); }
        .toast--warning { background: #fef7e0; color: #7a5d00; border-left-color: var(--color-warning); }
        .toast--info { background: #e8f0fe; color: #174ea6; border-left-color: var(--color-info); }

        .toast__icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
        .toast__text { flex: 1; }
        .toast__close {
            background: none;
            border: none;
            cursor: pointer;
            color: inherit;
            opacity: 0.5;
            font-size: 1rem;
            padding: 0;
            line-height: 1;
            flex-shrink: 0;
        }
        .toast__close:hover { opacity: 1; }

        /* ============================================================
           FALLBACK UI
           ============================================================ */
        .fallback-box {
            display: none;
            padding: 20px;
            background: var(--color-warning-light);
            border: 1px solid #fde293;
            border-radius: var(--radius-sm);
            margin-top: 16px;
            animation: fadeSlideIn 0.3s ease;
        }

        .fallback-box--visible { display: block; }

        .fallback-box__title {
            font-weight: 600;
            color: #7a5d00;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .fallback-box__text {
            font-size: 0.9rem;
            color: #5f4b00;
            line-height: 1.6;
        }

        .fallback-box__link {
            display: inline-block;
            margin-top: 10px;
            color: var(--color-primary);
            font-weight: 500;
            text-decoration: none;
        }

        .fallback-box__link:hover { text-decoration: underline; }

        /* ============================================================
           RESPONSIVE
           ============================================================ */
        @media (max-width: 768px) {
            .container { padding: 16px 12px 32px; }
            .card { padding: 20px 16px; }
            .tab-nav__btn { padding: 10px 14px; font-size: 0.85rem; }
            .tab-nav__btn span.tab-nav__label { display: none; }
            .tab-nav__icon { font-size: 1.2rem; }
            .input--chave { font-size: 0.95rem; letter-spacing: 1px; padding: 12px 14px; }
            .input-group { flex-direction: column; }
            .btn { width: 100%; justify-content: center; }
            .pdf-section__header { flex-direction: column; }
            .modal__content { width: 98%; max-width: none; border-radius: var(--radius-md); }
            .toast-container { bottom: 16px; right: 16px; left: 16px; max-width: none; width: auto; }
        }

        @media (max-width: 480px) {
            .header { padding: 0 12px; }
            .header__title { font-size: 1.05rem; }
            .header__subtitle { font-size: 0.7rem; }
            .card__title { font-size: 0.95rem; }
            .drop-zone { padding: 32px 16px; }
            .drop-zone__icon { font-size: 2.5rem; }
        }

        /* ============================================================
           ACCESSIBILITY & PRINT
           ============================================================ */
        .sr-only {
            position: absolute; width: 1px; height: 1px;
            padding: 0; margin: -1px; overflow: hidden;
            clip: rect(0,0,0,0); white-space: nowrap; border: 0;
        }

        @media print {
            .header, .tab-nav, .card, .btn, .toast-container, .loading-overlay, .modal { display: none !important; }
            .pdf-viewer-wrapper { box-shadow: none; border: none; }
            .pdf-viewer { height: auto; min-height: auto; }
            .container { max-width: 100%; padding: 0; }
        }

        /* Hide html5-qrcode internal elements we don't need */
        #camera-reader button { display: none !important; }

        /* =====================================================
           HELP SECTION — "Como obter o XML"
           ===================================================== */
        .help-section {
            margin-top: 20px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--color-surface);
        }

        .help-section__toggle {
            display: flex;
            align-items: center;
            gap: 10px;
            width: 100%;
            padding: 14px 18px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text);
            text-align: left;
            transition: background var(--transition);
        }

        .help-section__toggle:hover {
            background: var(--color-bg);
        }

        .help-section__toggle .fa-circle-question {
            color: var(--color-primary);
            font-size: 1.1rem;
        }

        .help-section__arrow {
            margin-left: auto;
            transition: transform 0.25s ease;
        }

        .help-section__toggle[aria-expanded="true"] .help-section__arrow {
            transform: rotate(180deg);
        }

        .help-section__content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 18px;
        }

        .help-section__content--open {
            max-height: 600px;
            padding: 0 18px 16px;
        }

        .help-section__intro {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            margin: 0 0 12px;
        }

        .help-section__list {
            margin: 0 0 12px 20px;
            padding: 0;
            font-size: 0.88rem;
            line-height: 1.7;
            color: var(--color-text);
        }

        .help-section__list li {
            margin-bottom: 6px;
        }

        .help-section__list a {
            color: var(--color-primary);
            text-decoration: none;
            font-weight: 500;
        }

        .help-section__list a:hover {
            text-decoration: underline;
        }

        .help-section__tip {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--color-primary-dark);
            background: #e8f0fe;
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            margin: 0;
        }

        .help-section__tip .fa-lightbulb {
            flex-shrink: 0;
            margin-top: 1px;
        }

        /* =====================================================
           SCAN KEY SECTION (Upload tab)
           ===================================================== */
        .scan-key-section {
            margin-top: 20px;
            padding: 16px 18px;
            background: var(--color-surface-alt);
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-sm);
        }

        .scan-key-section__header {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--color-text);
            margin-bottom: 4px;
        }

        .scan-key-section__header .fa-qrcode {
            color: var(--color-primary);
        }

        .scan-key-section__desc {
            font-size: 0.82rem;
            color: var(--color-text-secondary);
            margin: 0 0 10px;
        }

        .scanned-key-display {
            display: flex;
            align-items: center;
            gap: 10px;
            flex: 1;
            min-width: 0;
        }

        .scanned-key-display__icon {
            color: var(--color-success);
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .scanned-key-display__key {
            font-family: var(--font-mono);
            font-size: 0.78rem;
            background: var(--color-bg);
            padding: 6px 10px;
            border-radius: var(--radius-xs);
            color: var(--color-text);
            word-break: break-all;
            flex: 1;
            min-width: 0;
            border: 1px solid var(--color-border-light);
        }

        /* =====================================================
           NF-E LINKS DIRECTORY — National Banner
           ===================================================== */
        .nfe-national-banner {
            position: relative;
            border: 2px solid var(--color-primary);
            background: var(--color-primary-light);
            overflow: hidden;
        }

        .nfe-national-banner__badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-primary);
            color: #fff;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: var(--radius-xl);
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }

        .nfe-national-banner__desc {
            font-size: 0.88rem;
            color: var(--color-text-secondary);
            line-height: 1.6;
            margin-bottom: 16px;
            max-width: 700px;
        }

        .nfe-national-banner__link {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 22px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-sm);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
        }

        .nfe-national-banner__link:hover {
            background: var(--color-primary-hover);
            box-shadow: var(--shadow-md);
            text-decoration: none;
            color: #fff;
        }

        .nfe-national-banner__url {
            font-size: 0.75rem;
            opacity: 0.8;
            font-weight: 400;
            margin-left: 4px;
        }

        /* =====================================================
           NF-E FILTER
           ===================================================== */
        .nfe-filter-wrapper {
            position: relative;
            margin-bottom: 12px;
        }

        .nfe-filter-wrapper__icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--color-text-muted);
            font-size: 0.95rem;
            pointer-events: none;
            z-index: 1;
        }

        .nfe-filter-wrapper__input {
            width: 100%;
            padding: 11px 42px 11px 40px;
            border: 2px solid var(--color-border);
            border-radius: var(--radius-sm);
            font-family: var(--font-sans);
            font-size: 0.9rem;
            color: var(--color-text);
            background: var(--color-surface);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            outline: none;
        }

        .nfe-filter-wrapper__input:focus {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(26,115,232,0.12);
        }

        .nfe-filter-wrapper__input::placeholder {
            color: var(--color-text-muted);
        }

        .nfe-filter-wrapper__clear {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            cursor: pointer;
            color: var(--color-text-muted);
            font-size: 0.95rem;
            padding: 4px 8px;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
        }

        .nfe-filter-wrapper__clear:hover {
            color: var(--color-text);
            background: var(--color-border-light);
        }

        .nfe-filter-wrapper__results {
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            margin-bottom: 12px;
        }

        .nfe-filter-wrapper__results span:first-child {
            font-weight: 700;
            color: var(--color-primary);
        }

        /* =====================================================
           NF-E LINKS TABLE
           ===================================================== */
        .nfe-table-container {
            overflow-x: auto;
            margin: 0 -4px;
            border-radius: var(--radius-sm);
        }

        .nfe-links-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.88rem;
            min-width: 600px;
        }

        .nfe-links-table thead {
            background: var(--color-surface-alt);
            position: sticky;
            top: 0;
            z-index: 2;
        }

        .nfe-links-table th {
            text-align: left;
            padding: 10px 14px;
            font-weight: 600;
            font-size: 0.78rem;
            color: var(--color-text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.4px;
            border-bottom: 2px solid var(--color-border);
            white-space: nowrap;
        }

        .nfe-links-table td {
            padding: 10px 14px;
            border-bottom: 1px solid var(--color-border-light);
            vertical-align: middle;
        }

        .nfe-links-table tbody tr {
            transition: background var(--transition-fast);
        }

        .nfe-links-table tbody tr:hover {
            background: var(--color-surface-alt);
        }

        .nfe-estado-badge {
            display: inline-block;
            padding: 2px 8px;
            border-radius: var(--radius-xs);
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--color-info-light);
            color: var(--color-info);
            letter-spacing: 0.3px;
        }

        .nfe-sistema-tag {
            display: inline-block;
            padding: 2px 10px;
            border-radius: var(--radius-xs);
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--color-bg);
            color: var(--color-text-secondary);
            white-space: nowrap;
        }

        .nfe-sistema-tag--ginfes {
            background: #e8f5e9;
            color: #2e7d32;
        }

        .nfe-sistema-tag--capital {
            background: #fff3e0;
            color: #e65100;
        }

        .nfe-link-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 12px;
            border-radius: var(--radius-xs);
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--color-primary);
            color: #fff;
            text-decoration: none;
            white-space: nowrap;
            transition: all var(--transition-fast);
        }

        .nfe-link-btn:hover {
            background: var(--color-primary-hover);
            text-decoration: none;
            color: #fff;
            box-shadow: var(--shadow-sm);
        }

        /* =====================================================
           NF-E EMPTY STATE
           ===================================================== */
        .nfe-empty-state {
            text-align: center;
            padding: 24px 16px;
            color: var(--color-text-muted);
            font-size: 0.9rem;
        }

        .nfe-empty-state i {
            font-size: 1.5rem;
            display: block;
            margin-bottom: 8px;
            opacity: 0.6;
        }

        /* =====================================================
           NF-E GINFES TIP
           ===================================================== */
        .nfe-ginfes-tip {
            margin-top: 16px;
            padding: 12px 16px;
            background: var(--color-info-light);
            border-radius: var(--radius-sm);
            font-size: 0.84rem;
            color: var(--color-text-secondary);
            line-height: 1.6;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }

        .nfe-ginfes-tip i {
            color: var(--color-info);
            flex-shrink: 0;
            margin-top: 2px;
            font-size: 1rem;
        }

        .nfe-ginfes-tip code {
            background: var(--color-bg);
            padding: 1px 6px;
            border-radius: 3px;
            font-family: var(--font-mono);
            font-size: 0.82rem;
            white-space: nowrap;
        }

        /* =====================================================
           DARK THEME OVERRIDES — NF-e Directory
           ===================================================== */
        body.theme-dark .nfe-sistema-tag--ginfes {
            background: #1b3a1b;
            color: #81c784;
        }

        body.theme-dark .nfe-sistema-tag--capital {
            background: #3a2a10;
            color: #ffb74d;
        }

        body.theme-dark .nfe-national-banner {
            background: var(--color-primary-light);
            border-color: var(--color-primary);
        }

        body.theme-dark .nfe-ginfes-tip {
            background: var(--color-info-light);
        }

        body.theme-dark .nfe-ginfes-tip code {
            background: var(--color-surface);
        }

        /* =====================================================
           RESPONSIVE — NF-e Table
           ===================================================== */
        @media (max-width: 768px) {
            .nfe-links-table {
                font-size: 0.82rem;
                min-width: 500px;
            }

            .nfe-links-table th,
            .nfe-links-table td {
                padding: 8px 10px;
            }

            .nfe-national-banner__link {
                width: 100%;
                justify-content: center;
                text-align: center;
            }

            .nfe-ginfes-tip {
                flex-direction: column;
                gap: 6px;
            }

            .nfe-link-btn {
                padding: 6px 10px;
                font-size: 0.75rem;
            }
        }

        @media (max-width: 480px) {
            .nfe-national-banner__badge {
                font-size: 0.65rem;
                padding: 3px 10px;
            }

            .nfe-national-banner__url {
                display: block;
                margin-left: 0;
                margin-top: 2px;
            }
        }