/* ==================== RESET E VARIÁVEIS ====================  */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1e40af;
    --success: #16a34a;
    --success-light: #22c55e;
    --error: #dc2626;
    --warning: #ea580c;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html,
body {
    height: 100%;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #f0f4f8 100%);
    color: var(--gray-900);
    line-height: 1.6;
    transition: var(--transition);
}

/* ==================== CONTAINER ====================  */
.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ==================== HEADER ====================  */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.25rem 2rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    max-width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    flex-shrink: 0;
}

.logo-image {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.5px;
}

/* ==================== MAIN ====================  */
.main {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ==================== Página de carregamento ====================  */
.landing-page {
    width: 100%;
    max-width: 900px;
    opacity: 1;
    transition: var(--transition);
}

.landing-page.hidden {
    display: none;
    opacity: 0;
}

.landing-page.active {
    display: block;
    animation: fadeIn 0.4s ease-out;
}

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

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

.landing-content {
    text-align: center;
}

.landing-header {
    margin-bottom: 3rem;
}

.landing-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.landing-header p {
    font-size: 1.125rem;
    color: var(--gray-500);
    font-weight: 500;
    margin-bottom: 2rem;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.option-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    padding: 2.5rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.option-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.option-icon {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
}

.option-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.option-card p {
    font-size: 0.95rem;
    color: var(--gray-500);
    margin-bottom: 1.5rem;
    min-height: 2.4rem;
}

.option-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

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

.option-btn:active {
    transform: translateY(0);
}

/* ==================== PAGE ====================  */
.page {
    width: 100%;
    max-width: 600px;
    animation: fadeIn 0.4s ease-out;
}

.page.hidden {
    display: none;
    
}

.page-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    color: var(--gray-700);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--gray-200);
}

.page-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
}

.page-content {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
}

/* ==================== UPLOA Area ====================  */
.upload-area {
    border: 2px dashed var(--primary);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(30, 64, 175, 0.05) 100%);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 1.5rem;
}

.upload-area:hover {
    border-color: var(--primary-light);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(30, 64, 175, 0.08) 100%);
}

.upload-area.dragging {
    border-color: var(--success);
    background: linear-gradient(135deg, rgba(22, 163, 74, 0.08) 0%, rgba(16, 92, 44, 0.08) 100%);
}

.upload-icon {
    color: var(--primary);
    margin-bottom: 1rem;
}

.upload-area h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.upload-area p {
    font-size: 0.9rem;
    color: var(--gray-500);
}

/* ==================== Info do Arquivo ====================  */
.file-info {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.file-info.hidden {
    display: none;
}

.file-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.file-name {
    font-weight: 600;
    color: var(--gray-900);
    word-break: break-all;
}

.file-size {
    font-size: 0.85rem;
    color: var(--gray-500);
    font-weight: 500;
}

/* ====================Mostrar código ====================  */
.code-display {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border: 2px solid var(--primary);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    margin-top: 1.5rem;
    transition: var(--transition);
}

.code-display.hidden {
    display: none;
}

.code-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.code-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    font-family: 'Courier New', monospace;
    letter-spacing: 0.2em;
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    border: 1px solid var(--primary);
    word-break: break-all;
}

.code-info {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

/* ==================== FORM GROUP ====================  */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

input[type="text"],
input[type="file"] {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--white);
    color: var(--gray-900);
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="file"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input[type="text"]::placeholder {
    color: var(--gray-400);
}

/* ==================== BUTTONS ====================  */
.btn {
    display: inline-block;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--primary);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-lg {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
}

/* ==================== Mensagens ====================  */
.message {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    display: none;
    animation: slideDown 0.3s ease-out;
    border-left: 4px solid;
    font-weight: 500;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.message.active {
    display: block;
}

.message.success {
    background: #dcfce7;
    color: #166534;
    border-left-color: var(--success);
}

.message.error {
    background: #fee2e2;
    color: #991b1b;
    border-left-color: var(--error);
}

.message.info {
    background: #dbeafe;
    color: #1e40af;
    border-left-color: var(--primary);
}

.message.warning {
    background: #fed7aa;
    color: #9a3412;
    border-left-color: var(--warning);
}

/* ==================== PROGRESS BAR ====================  */
.download-progress {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: var(--gray-50);
    border-radius: 8px;
    border: 1px solid var(--gray-200);
}

.download-progress.hidden {
    display: none;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.download-file-name {
    font-weight: 600;
    color: var(--gray-900);
    word-break: break-all;
}

.download-file-size {
    font-size: 0.85rem;
    color: var(--gray-500);
    font-weight: 500;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    width: 0%;
    transition: width 0.3s ease-out;
    border-radius: 4px;
}

.progress-text {
    text-align: right;
    font-size: 0.85rem;
    color: var(--gray-500);
    font-weight: 600;
}

/* ==================== Responsividade ====================  */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .header-content {
        gap: 0.75rem;
    }

    .app-title {
        font-size: 1.25rem;
    }

    .main {
        padding: 1rem;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .landing-header h2 {
        font-size: 1.75rem;
    }

    .landing-header p {
        font-size: 1rem;
    }

    .options-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .option-card {
        padding: 1.5rem;
    }

    .page-content {
        padding: 1.5rem;
    }

    .code-value {
        font-size: 1.75rem;
        letter-spacing: 0.1em;
    }

    .page-header {
        flex-wrap: wrap;
    }

    .page-header h2 {
        font-size: 1.5rem;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .landing-header h2 {
        font-size: 1.5rem;
    }

    .landing-header p {
        font-size: 0.95rem;
    }

    .landing-image {
        max-width: 100%;
    }

    .option-card {
        padding: 1.25rem;
    }

    .option-card h3 {
        font-size: 1.25rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .code-value {
        font-size: 1.5rem;
        letter-spacing: 0.08em;
    }
}